Staging: comedi: remove C99 comments in das1800.c
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Bill Pemberton
Greg Kroah-Hartman
parent
cf0fd1086c
commit
a351ecf308
@ -108,12 +108,12 @@ TODO:
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#include "8253.h"
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#include "comedi_fc.h"
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// misc. defines
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#define DAS1800_SIZE 16 //uses 16 io addresses
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#define FIFO_SIZE 1024 // 1024 sample fifo
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#define TIMER_BASE 200 // 5 Mhz master clock
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#define UNIPOLAR 0x4 // bit that determines whether input range is uni/bipolar
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#define DMA_BUF_SIZE 0x1ff00 // size in bytes of dma buffers
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/* misc. defines */
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#define DAS1800_SIZE 16 /* uses 16 io addresses */
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#define FIFO_SIZE 1024 /* 1024 sample fifo */
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#define TIMER_BASE 200 /* 5 Mhz master clock */
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#define UNIPOLAR 0x4 /* bit that determines whether input range is uni/bipolar */
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#define DMA_BUF_SIZE 0x1ff00 /* size in bytes of dma buffers */
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/* Registers for the das1800 */
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#define DAS1800_FIFO 0x0
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@ -138,7 +138,7 @@ TODO:
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#define DMA_CH5_CH6 0x5
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#define DMA_CH6_CH7 0x6
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#define DMA_CH7_CH5 0x7
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#define DMA_ENABLED 0x3 //mask used to determine if dma is enabled
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#define DMA_ENABLED 0x3 /* mask used to determine if dma is enabled */
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#define DMA_DUAL 0x4
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#define IRQ3 0x8
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#define IRQ5 0x10
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@ -156,7 +156,7 @@ TODO:
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#define SD 0x40
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#define UB 0x80
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#define DAS1800_STATUS 0x7
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// bits that prevent interrupt status bits (and CVEN) from being cleared on write
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/* bits that prevent interrupt status bits (and CVEN) from being cleared on write */
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#define CLEAR_INTR_MASK (CVEN_MASK | 0x1f)
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#define INT 0x1
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#define DMATC 0x2
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@ -164,14 +164,14 @@ TODO:
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#define OVF 0x10
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#define FHF 0x20
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#define FNE 0x40
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#define CVEN_MASK 0x40 // masks CVEN on write
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#define CVEN_MASK 0x40 /* masks CVEN on write */
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#define CVEN 0x80
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#define DAS1800_BURST_LENGTH 0x8
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#define DAS1800_BURST_RATE 0x9
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#define DAS1800_QRAM_ADDRESS 0xa
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#define DAS1800_COUNTER 0xc
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#define IOBASE2 0x400 //offset of additional ioports used on 'ao' cards
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#define IOBASE2 0x400 /* offset of additional ioports used on 'ao' cards */
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enum {
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das1701st, das1701st_da, das1702st, das1702st_da, das1702hr,
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@ -212,7 +212,7 @@ static int das1800_set_frequency(struct comedi_device * dev);
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static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode);
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static unsigned int suggest_transfer_size(struct comedi_cmd * cmd);
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// analog input ranges
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/* analog input ranges */
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static const struct comedi_lrange range_ai_das1801 = {
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8,
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{
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@ -485,7 +485,7 @@ struct das1800_private {
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#define devpriv ((struct das1800_private *)dev->private)
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// analog out range for boards with basic analog out
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/* analog out range for boards with basic analog out */
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static const struct comedi_lrange range_ao_1 = {
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1,
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{
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@ -493,7 +493,7 @@ static const struct comedi_lrange range_ao_1 = {
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}
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};
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// analog out range for 'ao' boards
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/* analog out range for 'ao' boards */
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/*
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static const struct comedi_lrange range_ao_2 = {
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2,
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@ -525,26 +525,26 @@ static int das1800_init_dma(struct comedi_device * dev, unsigned int dma0,
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{
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unsigned long flags;
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// need an irq to do dma
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/* need an irq to do dma */
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if (dev->irq && dma0) {
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//encode dma0 and dma1 into 2 digit hexadecimal for switch
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/* encode dma0 and dma1 into 2 digit hexadecimal for switch */
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switch ((dma0 & 0x7) | (dma1 << 4)) {
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case 0x5: // dma0 == 5
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case 0x5: /* dma0 == 5 */
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devpriv->dma_bits |= DMA_CH5;
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break;
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case 0x6: // dma0 == 6
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case 0x6: /* dma0 == 6 */
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devpriv->dma_bits |= DMA_CH6;
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break;
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case 0x7: // dma0 == 7
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case 0x7: /* dma0 == 7 */
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devpriv->dma_bits |= DMA_CH7;
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break;
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case 0x65: // dma0 == 5, dma1 == 6
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case 0x65: /* dma0 == 5, dma1 == 6 */
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devpriv->dma_bits |= DMA_CH5_CH6;
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break;
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case 0x76: // dma0 == 6, dma1 == 7
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case 0x76: /* dma0 == 6, dma1 == 7 */
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devpriv->dma_bits |= DMA_CH6_CH7;
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break;
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case 0x57: // dma0 == 7, dma1 == 5
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case 0x57: /* dma0 == 7, dma1 == 5 */
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devpriv->dma_bits |= DMA_CH7_CH5;
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break;
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default:
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@ -638,7 +638,7 @@ static int das1800_attach(struct comedi_device * dev, struct comedi_devconfig *
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dev->board_ptr = das1800_boards + board;
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dev->board_name = thisboard->name;
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// if it is an 'ao' board with fancy analog out then we need extra io ports
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/* if it is an 'ao' board with fancy analog out then we need extra io ports */
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if (thisboard->ao_ability == 2) {
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iobase2 = iobase + IOBASE2;
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if (!request_region(iobase2, DAS1800_SIZE,
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@ -659,7 +659,7 @@ static int das1800_attach(struct comedi_device * dev, struct comedi_devconfig *
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}
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dev->irq = irq;
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// set bits that tell card which irq to use
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/* set bits that tell card which irq to use */
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switch (irq) {
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case 0:
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break;
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@ -751,12 +751,12 @@ static int das1800_attach(struct comedi_device * dev, struct comedi_devconfig *
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das1800_cancel(dev, dev->read_subdev);
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// initialize digital out channels
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/* initialize digital out channels */
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outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
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// initialize analog out channels
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/* initialize analog out channels */
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if (thisboard->ao_ability == 1) {
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// select 'update' dac channel for baseAddress + 0x0
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/* select 'update' dac channel for baseAddress + 0x0 */
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outb(DAC(thisboard->ao_n_chan - 1),
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dev->iobase + DAS1800_SELECT);
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outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
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@ -871,7 +871,7 @@ static int das1800_ai_poll(struct comedi_device * dev, struct comedi_subdevice *
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{
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unsigned long flags;
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// prevent race with interrupt handler
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/* prevent race with interrupt handler */
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comedi_spin_lock_irqsave(&dev->spinlock, flags);
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das1800_ai_handler(dev);
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comedi_spin_unlock_irqrestore(&dev->spinlock, flags);
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@ -901,14 +901,14 @@ static irqreturn_t das1800_interrupt(int irq, void *d PT_REGS_ARG)
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}
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/* clear the interrupt status bit INT */
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outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
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// handle interrupt
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/* handle interrupt */
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das1800_ai_handler(dev);
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spin_unlock(&dev->spinlock);
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return IRQ_HANDLED;
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}
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// the guts of the interrupt handler, that is shared with das1800_ai_poll
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/* the guts of the interrupt handler, that is shared with das1800_ai_poll */
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static void das1800_ai_handler(struct comedi_device * dev)
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{
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struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */
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@ -917,22 +917,22 @@ static void das1800_ai_handler(struct comedi_device * dev)
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unsigned int status = inb(dev->iobase + DAS1800_STATUS);
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async->events = 0;
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// select adc for base address + 0
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/* select adc for base address + 0 */
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outb(ADC, dev->iobase + DAS1800_SELECT);
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// dma buffer full
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/* dma buffer full */
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if (devpriv->irq_dma_bits & DMA_ENABLED) {
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// look for data from dma transfer even if dma terminal count hasn't happened yet
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/* look for data from dma transfer even if dma terminal count hasn't happened yet */
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das1800_handle_dma(dev, s, status);
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} else if (status & FHF) { // if fifo half full
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} else if (status & FHF) { /* if fifo half full */
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das1800_handle_fifo_half_full(dev, s);
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} else if (status & FNE) { // if fifo not empty
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} else if (status & FNE) { /* if fifo not empty */
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das1800_handle_fifo_not_empty(dev, s);
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}
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async->events |= COMEDI_CB_BLOCK;
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/* if the card's fifo has overflowed */
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if (status & OVF) {
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// clear OVF interrupt bit
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/* clear OVF interrupt bit */
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outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
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comedi_error(dev, "DAS1800 FIFO overflow");
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das1800_cancel(dev, s);
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@ -940,19 +940,19 @@ static void das1800_ai_handler(struct comedi_device * dev)
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comedi_event(dev, s);
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return;
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}
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// stop taking data if appropriate
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/* stop taking data if appropriate */
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/* stop_src TRIG_EXT */
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if (status & CT0TC) {
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// clear CT0TC interrupt bit
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/* clear CT0TC interrupt bit */
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outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
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// make sure we get all remaining data from board before quitting
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/* make sure we get all remaining data from board before quitting */
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if (devpriv->irq_dma_bits & DMA_ENABLED)
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das1800_flush_dma(dev, s);
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else
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das1800_handle_fifo_not_empty(dev, s);
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das1800_cancel(dev, s); /* disable hardware conversions */
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async->events |= COMEDI_CB_EOA;
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} else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { // stop_src TRIG_COUNT
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} else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */
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das1800_cancel(dev, s); /* disable hardware conversions */
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async->events |= COMEDI_CB_EOA;
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}
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@ -971,7 +971,7 @@ static void das1800_handle_dma(struct comedi_device * dev, struct comedi_subdevi
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flags = claim_dma_lock();
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das1800_flush_dma_channel(dev, s, devpriv->dma_current,
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devpriv->dma_current_buf);
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// re-enable dma channel
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/* re-enable dma channel */
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set_dma_addr(devpriv->dma_current,
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virt_to_bus(devpriv->dma_current_buf));
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set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
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@ -979,11 +979,11 @@ static void das1800_handle_dma(struct comedi_device * dev, struct comedi_subdevi
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release_dma_lock(flags);
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if (status & DMATC) {
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// clear DMATC interrupt bit
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/* clear DMATC interrupt bit */
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outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
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// switch dma channels for next time, if appropriate
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/* switch dma channels for next time, if appropriate */
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if (dual_dma) {
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// read data from the other channel next time
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/* read data from the other channel next time */
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if (devpriv->dma_current == devpriv->dma0) {
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devpriv->dma_current = devpriv->dma1;
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devpriv->dma_current_buf = devpriv->ai_buf1;
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@ -1035,7 +1035,7 @@ static void das1800_flush_dma_channel(struct comedi_device * dev, struct comedi_
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* get set correctly */
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clear_dma_ff(channel);
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// figure out how many points to read
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/* figure out how many points to read */
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num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
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num_samples = num_bytes / sizeof(short);
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@ -1063,7 +1063,7 @@ static void das1800_flush_dma(struct comedi_device * dev, struct comedi_subdevic
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devpriv->dma_current_buf);
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if (dual_dma) {
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// switch to other channel and flush it
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/* switch to other channel and flush it */
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if (devpriv->dma_current == devpriv->dma0) {
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devpriv->dma_current = devpriv->dma1;
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devpriv->dma_current_buf = devpriv->ai_buf1;
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@ -1077,7 +1077,7 @@ static void das1800_flush_dma(struct comedi_device * dev, struct comedi_subdevic
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release_dma_lock(flags);
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// get any remaining samples in fifo
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/* get any remaining samples in fifo */
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das1800_handle_fifo_not_empty(dev, s);
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return;
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@ -1180,7 +1180,7 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde
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/* step 2: make sure trigger sources are unique and mutually compatible */
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// uniqueness check
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/* uniqueness check */
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if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
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err++;
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if (cmd->scan_begin_src != TRIG_FOLLOW &&
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@ -1192,7 +1192,7 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde
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if (cmd->stop_src != TRIG_COUNT &&
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cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT)
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err++;
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//compatibility check
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/* compatibility check */
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if (cmd->scan_begin_src != TRIG_FOLLOW &&
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cmd->convert_src != TRIG_TIMER)
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err++;
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@ -1244,7 +1244,7 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde
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/* step 4: fix up any arguments */
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if (cmd->convert_src == TRIG_TIMER) {
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// if we are not in burst mode
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/* if we are not in burst mode */
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if (cmd->scan_begin_src == TRIG_FOLLOW) {
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tmp_arg = cmd->convert_arg;
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/* calculate counter values that give desired timing */
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@ -1255,9 +1255,9 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde
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if (tmp_arg != cmd->convert_arg)
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err++;
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}
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// if we are in burst mode
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/* if we are in burst mode */
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else {
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// check that convert_arg is compatible
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/* check that convert_arg is compatible */
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tmp_arg = cmd->convert_arg;
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cmd->convert_arg =
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burst_convert_arg(cmd->convert_arg,
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@ -1266,7 +1266,7 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde
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err++;
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if (cmd->scan_begin_src == TRIG_TIMER) {
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// if scans are timed faster than conversion rate allows
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/* if scans are timed faster than conversion rate allows */
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if (cmd->convert_arg * cmd->chanlist_len >
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cmd->scan_begin_arg) {
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cmd->scan_begin_arg =
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@ -1290,7 +1290,7 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde
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if (err)
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return 4;
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// make sure user is not trying to mix unipolar and bipolar ranges
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/* make sure user is not trying to mix unipolar and bipolar ranges */
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if (cmd->chanlist) {
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unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
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for (i = 1; i < cmd->chanlist_len; i++) {
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@ -1311,14 +1311,14 @@ static int das1800_ai_do_cmdtest(struct comedi_device * dev, struct comedi_subde
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/* analog input cmd interface */
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// first, some utility functions used in the main ai_do_cmd()
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/* first, some utility functions used in the main ai_do_cmd() */
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// returns appropriate bits for control register a, depending on command
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/* returns appropriate bits for control register a, depending on command */
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static int control_a_bits(struct comedi_cmd cmd)
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{
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int control_a;
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control_a = FFEN; //enable fifo
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control_a = FFEN; /* enable fifo */
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if (cmd.stop_src == TRIG_EXT) {
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control_a |= ATEN;
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}
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@ -1336,7 +1336,7 @@ static int control_a_bits(struct comedi_cmd cmd)
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return control_a;
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}
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// returns appropriate bits for control register c, depending on command
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/* returns appropriate bits for control register c, depending on command */
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static int control_c_bits(struct comedi_cmd cmd)
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{
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int control_c;
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@ -1346,7 +1346,7 @@ static int control_c_bits(struct comedi_cmd cmd)
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* select unipolar / bipolar
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*/
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aref = CR_AREF(cmd.chanlist[0]);
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control_c = UQEN; //enable upper qram addresses
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control_c = UQEN; /* enable upper qram addresses */
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if (aref != AREF_DIFF)
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control_c |= SD;
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if (aref == AREF_COMMON)
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@ -1355,7 +1355,7 @@ static int control_c_bits(struct comedi_cmd cmd)
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if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR)
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control_c |= UB;
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switch (cmd.scan_begin_src) {
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case TRIG_FOLLOW: // not in burst mode
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case TRIG_FOLLOW: /* not in burst mode */
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switch (cmd.convert_src) {
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case TRIG_TIMER:
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/* trig on cascaded counters */
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@ -1370,11 +1370,11 @@ static int control_c_bits(struct comedi_cmd cmd)
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}
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break;
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case TRIG_TIMER:
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// burst mode with internal pacer clock
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/* burst mode with internal pacer clock */
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control_c |= BMDE | IPCLK;
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break;
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case TRIG_EXT:
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// burst mode with external trigger
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/* burst mode with external trigger */
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control_c |= BMDE | XPCLK;
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break;
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default:
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@ -1384,12 +1384,12 @@ static int control_c_bits(struct comedi_cmd cmd)
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return control_c;
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}
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// sets up counters
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/* sets up counters */
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static int setup_counters(struct comedi_device * dev, struct comedi_cmd cmd)
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{
|
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// setup cascaded counters for conversion/scan frequency
|
||||
/* setup cascaded counters for conversion/scan frequency */
|
||||
switch (cmd.scan_begin_src) {
|
||||
case TRIG_FOLLOW: // not in burst mode
|
||||
case TRIG_FOLLOW: /* not in burst mode */
|
||||
if (cmd.convert_src == TRIG_TIMER) {
|
||||
/* set conversion frequency */
|
||||
i8253_cascade_ns_to_timer_2div(TIMER_BASE,
|
||||
@ -1401,7 +1401,7 @@ static int setup_counters(struct comedi_device * dev, struct comedi_cmd cmd)
|
||||
}
|
||||
}
|
||||
break;
|
||||
case TRIG_TIMER: // in burst mode
|
||||
case TRIG_TIMER: /* in burst mode */
|
||||
/* set scan frequency */
|
||||
i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
|
||||
&(devpriv->divisor2), &(cmd.scan_begin_arg),
|
||||
@ -1414,16 +1414,16 @@ static int setup_counters(struct comedi_device * dev, struct comedi_cmd cmd)
|
||||
break;
|
||||
}
|
||||
|
||||
// setup counter 0 for 'about triggering'
|
||||
/* setup counter 0 for 'about triggering' */
|
||||
if (cmd.stop_src == TRIG_EXT) {
|
||||
// load counter 0 in mode 0
|
||||
/* load counter 0 in mode 0 */
|
||||
i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
// sets up dma
|
||||
/* sets up dma */
|
||||
static void setup_dma(struct comedi_device * dev, struct comedi_cmd cmd)
|
||||
{
|
||||
unsigned long lock_flags;
|
||||
@ -1440,19 +1440,19 @@ static void setup_dma(struct comedi_device * dev, struct comedi_cmd cmd)
|
||||
* count and address get set correctly */
|
||||
clear_dma_ff(devpriv->dma0);
|
||||
set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
|
||||
// set appropriate size of transfer
|
||||
/* set appropriate size of transfer */
|
||||
set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
|
||||
devpriv->dma_current = devpriv->dma0;
|
||||
devpriv->dma_current_buf = devpriv->ai_buf0;
|
||||
enable_dma(devpriv->dma0);
|
||||
// set up dual dma if appropriate
|
||||
/* set up dual dma if appropriate */
|
||||
if (dual_dma) {
|
||||
disable_dma(devpriv->dma1);
|
||||
/* clear flip-flop to make sure 2-byte registers for
|
||||
* count and address get set correctly */
|
||||
clear_dma_ff(devpriv->dma1);
|
||||
set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
|
||||
// set appropriate size of transfer
|
||||
/* set appropriate size of transfer */
|
||||
set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
|
||||
enable_dma(devpriv->dma1);
|
||||
}
|
||||
@ -1461,16 +1461,16 @@ static void setup_dma(struct comedi_device * dev, struct comedi_cmd cmd)
|
||||
return;
|
||||
}
|
||||
|
||||
// programs channel/gain list into card
|
||||
/* programs channel/gain list into card */
|
||||
static void program_chanlist(struct comedi_device * dev, struct comedi_cmd cmd)
|
||||
{
|
||||
int i, n, chan_range;
|
||||
unsigned long irq_flags;
|
||||
const int range_mask = 0x3; //masks unipolar/bipolar bit off range
|
||||
const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */
|
||||
const int range_bitshift = 8;
|
||||
|
||||
n = cmd.chanlist_len;
|
||||
// spinlock protects indirect addressing
|
||||
/* spinlock protects indirect addressing */
|
||||
comedi_spin_lock_irqsave(&dev->spinlock, irq_flags);
|
||||
outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
|
||||
outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */
|
||||
@ -1488,7 +1488,7 @@ static void program_chanlist(struct comedi_device * dev, struct comedi_cmd cmd)
|
||||
return;
|
||||
}
|
||||
|
||||
// analog input do_cmd
|
||||
/* analog input do_cmd */
|
||||
static int das1800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice * s)
|
||||
{
|
||||
int ret;
|
||||
@ -1509,22 +1509,22 @@ static int das1800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice
|
||||
} else {
|
||||
devpriv->irq_dma_bits |= devpriv->dma_bits;
|
||||
}
|
||||
// interrupt on end of conversion for TRIG_WAKE_EOS
|
||||
/* interrupt on end of conversion for TRIG_WAKE_EOS */
|
||||
if (cmd.flags & TRIG_WAKE_EOS) {
|
||||
// interrupt fifo not empty
|
||||
/* interrupt fifo not empty */
|
||||
devpriv->irq_dma_bits &= ~FIMD;
|
||||
} else {
|
||||
// interrupt fifo half full
|
||||
/* interrupt fifo half full */
|
||||
devpriv->irq_dma_bits |= FIMD;
|
||||
}
|
||||
// determine how many conversions we need
|
||||
/* determine how many conversions we need */
|
||||
if (cmd.stop_src == TRIG_COUNT) {
|
||||
devpriv->count = cmd.stop_arg * cmd.chanlist_len;
|
||||
}
|
||||
|
||||
das1800_cancel(dev, s);
|
||||
|
||||
// determine proper bits for control registers
|
||||
/* determine proper bits for control registers */
|
||||
control_a = control_a_bits(cmd);
|
||||
control_c = control_c_bits(cmd);
|
||||
|
||||
@ -1537,14 +1537,14 @@ static int das1800_ai_do_cmd(struct comedi_device * dev, struct comedi_subdevice
|
||||
}
|
||||
setup_dma(dev, cmd);
|
||||
outb(control_c, dev->iobase + DAS1800_CONTROL_C);
|
||||
// set conversion rate and length for burst mode
|
||||
/* set conversion rate and length for burst mode */
|
||||
if (control_c & BMDE) {
|
||||
// program conversion period with number of microseconds minus 1
|
||||
/* program conversion period with number of microseconds minus 1 */
|
||||
outb(cmd.convert_arg / 1000 - 1,
|
||||
dev->iobase + DAS1800_BURST_RATE);
|
||||
outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
|
||||
}
|
||||
outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); // enable irq/dma
|
||||
outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */
|
||||
outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */
|
||||
outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
|
||||
|
||||
@ -1616,21 +1616,21 @@ static int das1800_ao_winsn(struct comedi_device * dev, struct comedi_subdevice
|
||||
struct comedi_insn * insn, unsigned int * data)
|
||||
{
|
||||
int chan = CR_CHAN(insn->chanspec);
|
||||
// int range = CR_RANGE(insn->chanspec);
|
||||
/* int range = CR_RANGE(insn->chanspec); */
|
||||
int update_chan = thisboard->ao_n_chan - 1;
|
||||
short output;
|
||||
unsigned long irq_flags;
|
||||
|
||||
// card expects two's complement data
|
||||
/* card expects two's complement data */
|
||||
output = data[0] - (1 << (thisboard->resolution - 1));
|
||||
// if the write is to the 'update' channel, we need to remember its value
|
||||
/* if the write is to the 'update' channel, we need to remember its value */
|
||||
if (chan == update_chan)
|
||||
devpriv->ao_update_bits = output;
|
||||
// write to channel
|
||||
/* write to channel */
|
||||
comedi_spin_lock_irqsave(&dev->spinlock, irq_flags);
|
||||
outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */
|
||||
outw(output, dev->iobase + DAS1800_DAC);
|
||||
// now we need to write to 'update' channel to update all dac channels
|
||||
/* now we need to write to 'update' channel to update all dac channels */
|
||||
if (chan != update_chan) {
|
||||
outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */
|
||||
outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
|
||||
@ -1657,7 +1657,7 @@ static int das1800_do_wbits(struct comedi_device * dev, struct comedi_subdevice
|
||||
{
|
||||
unsigned int wbits;
|
||||
|
||||
// only set bits that have been masked
|
||||
/* only set bits that have been masked */
|
||||
data[0] &= (1 << s->n_chan) - 1;
|
||||
wbits = devpriv->do_bits;
|
||||
wbits &= ~data[0];
|
||||
@ -1676,11 +1676,11 @@ static int das1800_set_frequency(struct comedi_device * dev)
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
// counter 1, mode 2
|
||||
/* counter 1, mode 2 */
|
||||
if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
|
||||
2))
|
||||
err++;
|
||||
// counter 2, mode 2
|
||||
/* counter 2, mode 2 */
|
||||
if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
|
||||
2))
|
||||
err++;
|
||||
@ -1697,11 +1697,11 @@ static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
|
||||
{
|
||||
unsigned int micro_sec;
|
||||
|
||||
// in burst mode, the maximum conversion time is 64 microseconds
|
||||
/* in burst mode, the maximum conversion time is 64 microseconds */
|
||||
if (convert_arg > 64000)
|
||||
convert_arg = 64000;
|
||||
|
||||
// the conversion time must be an integral number of microseconds
|
||||
/* the conversion time must be an integral number of microseconds */
|
||||
switch (round_mode) {
|
||||
case TRIG_ROUND_NEAREST:
|
||||
default:
|
||||
@ -1715,21 +1715,21 @@ static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
|
||||
break;
|
||||
}
|
||||
|
||||
// return number of nanoseconds
|
||||
/* return number of nanoseconds */
|
||||
return micro_sec * 1000;
|
||||
}
|
||||
|
||||
// utility function that suggests a dma transfer size based on the conversion period 'ns'
|
||||
/* utility function that suggests a dma transfer size based on the conversion period 'ns' */
|
||||
static unsigned int suggest_transfer_size(struct comedi_cmd * cmd)
|
||||
{
|
||||
unsigned int size = DMA_BUF_SIZE;
|
||||
static const int sample_size = 2; // size in bytes of one sample from board
|
||||
unsigned int fill_time = 300000000; // target time in nanoseconds for filling dma buffer
|
||||
unsigned int max_size; // maximum size we will allow for a transfer
|
||||
static const int sample_size = 2; /* size in bytes of one sample from board */
|
||||
unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */
|
||||
unsigned int max_size; /* maximum size we will allow for a transfer */
|
||||
|
||||
// make dma buffer fill in 0.3 seconds for timed modes
|
||||
/* make dma buffer fill in 0.3 seconds for timed modes */
|
||||
switch (cmd->scan_begin_src) {
|
||||
case TRIG_FOLLOW: // not in burst mode
|
||||
case TRIG_FOLLOW: /* not in burst mode */
|
||||
if (cmd->convert_src == TRIG_TIMER)
|
||||
size = (fill_time / cmd->convert_arg) * sample_size;
|
||||
break;
|
||||
@ -1742,9 +1742,9 @@ static unsigned int suggest_transfer_size(struct comedi_cmd * cmd)
|
||||
break;
|
||||
}
|
||||
|
||||
// set a minimum and maximum size allowed
|
||||
/* set a minimum and maximum size allowed */
|
||||
max_size = DMA_BUF_SIZE;
|
||||
// if we are taking limited number of conversions, limit transfer size to that
|
||||
/* if we are taking limited number of conversions, limit transfer size to that */
|
||||
if (cmd->stop_src == TRIG_COUNT &&
|
||||
cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
|
||||
max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user