pci550x_dac0_dma.c

linux下面

/*
 * pci550x user program - DAC0 DMA Acquisition
 *
 * This test program uses a clock signal from either the internal DAC0
 * PACER clock or the external clock source, DACLKIN, to clock the DAC.
 * Output data is written directly to the DAC0 FIFO via DMA, and then
 * clocked to generate the voltage ouput at the DAC0 port. This mode of
 * operation is referred to as DMA, meaning that interrupts and DMA
 * functions are used to output the sample data.  In this method of
 * operating the DAC, the non-full DAC0 FIFO is written continuously.  If
 * the output rate exceeds the rate at which the DAC0 FIFO can be kept
 * non-empty by DMA operations,  the DAC0 FIFO will underflow and DAC
 * conversions are automatically disabled by the hardware.
 *
 * Invoke this test program from the command line as follows:
 *
 * $ ./pci550x_dac0_dma -f /dev/pci550xN [-p] [-u] [-d USECS | -F NSECS]
 *		[-s SAMPLES] [-g | -G | -t | -T] [-x | -X ] [-b]
 *
 *      -f /dev/pci550xN        = device node (N=device #)
 *      -p                      = packed data mode
 *      -u                      = unipolar
 *      -d USECS                = delay between DAC conversions in microseconds
 *      -F NSECS                = .25 usec delay between DAC conversions
 *	-s SAMPLES		= number sample outputs per DMA buffer
 *	-g			= DAC external gate DATGIN (active low)
 *	-G			= DAC external gate DATGIN (active high)
 *	-t			= DAC external trigger DATGIN (falling edge)
 *	-T			= DAC external trigger DATGIN (rising edge) 
 *	-x			= external clock DACLKIN (falling edge)
 *	-X			= external clock DACLKIN (rising edge)
 *	-b			= brief output listing 
 *
 * EXAMPLE: run the test on device 3 in packed unipolar data mode at
 * 10ms DAC conversion rate with 100 samples outputs per DMA buffer
 *
 * $ ./pci550x_dac0_dma -f /dev/pci550x3 -p -u -d10000 -s100
 *
 */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <linux/limits.h>

#define _PCI550X_USE_DAC_RANGE_TABLES
#include "pci550x.h"

/* GLOBLA DATA */

int i,c;
int dac0_status;
int dac0_ctrl;
unsigned int *buf = NULL;
size_t buf_size;
ssize_t bytes;
char device[PATH_MAX] = "/dev/pci550x0";
int packed = PCI550X_DISABLE;
int bipolar = PCI550X_ENABLE;
unsigned long udelay = PCI550X_NOMINAL_DAC_RATE;
unsigned long ndelay = 64;
unsigned short samples = PCI550X_DAC_FIFO;
int gate_enabled = PCI550X_FALSE;
int g = PCI550X_DISABLE; int G = PCI550X_DISABLE;
int t = PCI550X_DISABLE; int T = PCI550X_DISABLE;
int X = PCI550X_DISABLE; int x = PCI550X_DISABLE;
int F = PCI550X_DISABLE; int S = PCI550X_DISABLE;
int brief = PCI550X_DISABLE;

char sentinal[6] = {'-','\\','-','|','-','/'}; unsigned char mm = 0;

union {
unsigned int dac_data;
short bp_dac_data[2];
unsigned short up_dac_data[2];
} dma;

int fd, rc;
int brd_type;

void sighandler(int signum) {
 
        /* Disable DAC0 DMA */
        rc = ioctl(fd, PCI550X_IOCT_DA0_DMAEN, PCI550X_DISABLE);
        if(rc == -1) {
                perror("ioctl PCI550X_IOCT_DA0_DMAEN");
		free(buf);
                exit(1);
        } else {
		printf("DAC0 DMA halted\n");
        }

	/* free the output buffer */
	free(buf);

	/* close the device */
	close(fd);

	exit(0);
}

int main(int argc, char **argv) {
 
        /* get command line args */
        opterr = 0;
        while ((c = getopt(argc, argv, "f:uphd:s:F:gGtTxXb")) != -1)
 
                switch(c) {
 
                case 'd':
                        if ((sscanf(optarg, "%ld", &udelay)) == 0)
                                udelay = 10000;
                        break;
                case 'F':
                        if ((sscanf(optarg, "%ld", &ndelay)) == 0)
                                ndelay = 64;
			F = PCI550X_ENABLE;
                        break;
                case 'f':
                        strncpy(device, optarg, PATH_MAX);
                        break;
                case 'u':
                        bipolar = PCI550X_DISABLE;
                        break;
                case 's':
                        if ((sscanf(optarg, "%hd", &samples)) == 0) {
				printf("error: invalid sample count\n");
				exit(1);
			}
			if (!samples) {
				printf("error: sample count is zero\n");
				exit(1);
			}
                        break;
                case 'p':
                        packed = PCI550X_ENABLE;
                        break;
                case 'h':
                        printf("usage: pci550x_dac0_dma -f /dev/pci550xN "
                                "[-p] [-u] [-d USECS] [-s SAMPLES]\n");
                        printf("-f /dev/pci550xN where N = board number\n");
                        printf("-p, packed data mode\n");
                        printf("-u, unipolar mode\n");
                        printf("-d USECS = microseconds delay between "
                                "DAC conversions\n");
                        printf("-F NSECS = .25 microseconds delay between "
                                "DAC conversions\n");
			printf("-s SAMPLES = number of output samples per DMA "
				"buffer\n");
 			printf("-g, DAC external gate DATGIN (active low)\n");
 			printf("-G, DAC external gate DATGIN (active high)\n");
 			printf("-t, DAC external trigger (falling edge)\n");
 			printf("-T, DAC external trigger (rising edge)\n");
			printf("-x, external clock DACLKIN (falling edge)\n");
			printf("-X, external clock DACLKIN (rising edge)\n");
			printf("-b, brief output listing\n");
                        exit(0);
		case 'g':
			g = PCI550X_ENABLE;
			break;
		case 'G':
			G = PCI550X_ENABLE;
			break;
		case 't':
			t = PCI550X_ENABLE;
			break;
		case 'T':
			T = PCI550X_ENABLE;
			break;
		case 'X':
			X = PCI550X_ENABLE;
			break;
		case 'x':
			x = PCI550X_ENABLE;
			break;
		case 'b':
			brief = PCI550X_ENABLE;
			break;
                default:
                        break;
                }

        /* allocate an output buffer */
	buf_size = samples << 2; /* DMA requires 4 bytes (32 bit) per sample */
        buf = (unsigned int *)malloc(buf_size);
        if (!buf) {
		perror("failed to allocate DAC0 DMA output buffer");
                exit(1);
        }

	/* open the device */
	fd = open(device, O_WRONLY);
	if(fd == -1) {
		perror("open failed");
		free(buf);
		exit(1);
	} else {
		printf("open succeeded on %s\n", device);
	}

	/* query device type */
	rc = ioctl(fd, PCI550X_IOCG_BRD_TYPE, &brd_type);
	if(rc == -1) {
		perror("ioctl PCI550X_IOCG_BRD_TYPE");
		free(buf);
		exit(1);
	} else {
		printf("ADAC Board Type:  %s\n", brd_names[brd_type]);
	}

        /* select DAC0 */
        rc = ioctl(fd, PCI550X_IOCT_DAC_SELECT, PCI550X_DAC0);
        if(rc == -1) {
                perror("ioctl PCI550X_IOC_DAC_SELECT");
		free(buf);
                exit(1);
        } else {
                printf("DAC0 Subsystem selected\n");
        }

	/* select DAC0 PACER Clock Source */
	if (x) {
		rc = ioctl(fd, PCI550X_IOCT_DA0_CLOCK_SOURCE, DAC0_EXF_CLK);
		if(rc == -1) {
			perror("ioctl PCI550X_IOCT_DA0_CLOCK_SOURCE");
			exit(1);
		} else {
			printf("External Clock Source (falling edge)\n");
		}
	} else if (X) {
		rc = ioctl(fd, PCI550X_IOCT_DA0_CLOCK_SOURCE, DAC0_EXR_CLK);
		if(rc == -1) {
			perror("ioctl PCI550X_IOCT_DA0_CLOCK_SOURCE");
			exit(1);
		} else {
			printf("External Clock Source (rising edge)\n");
		}
	} else {
		rc = ioctl(fd, PCI550X_IOCT_DA0_CLOCK_SOURCE, DAC0_IP_CLK);
		if(rc == -1) {
			perror("ioctl PCI550X_IOCT_DA0_CLOCK_SOURCE");
			exit(1);
		} else {
			printf("Internal Pacer Clock Source enabled\n");
		}

		/* set the PACER CLOCK RATE */
	        if (F) {
			rc = ioctl(fd, PCI550X_IOCT_DA0_FPCEN,
					PCI550X_ENABLE);
			if(rc == -1) {
				perror("ioctl PCI550X_IOCT_DA0_FPCEN");
				exit(1);
			}
			rc = ioctl(fd, PCI550X_IOCS_DAC0_FAST_CLOCK_RATE,
				&ndelay);
			if(rc == -1) {
				perror("ioctl "
					"PCI550X_IOCS_DAC0_FAST_CLOCK_RATE");
				exit(1);
			} else {
				printf("DAC0 Pacer clock(0.25 usecs): %lu\n",
					 ndelay);
			}
		} else {
			rc = ioctl(fd, PCI550X_IOCT_DA0_FPCEN,
					PCI550X_DISABLE);
			if(rc == -1) {
				perror("ioctl PCI550X_IOCT_DA0_FPCEN");
				exit(1);
			}
			rc = ioctl(fd, PCI550X_IOCS_DAC0_PACER_CLOCK_RATE,
				&udelay);
			if(rc == -1) {
				perror("ioctl "
					"PCI550X_IOCS_DAC0_PACER_CLOCK_RATE");
				exit(1);
			} else {
				printf("DAC0 Pacer clock(nsecs): %ld\n",
					udelay);
			}
		}
	}

	/* enable DAC0 FIFO */
	rc = ioctl(fd, PCI550X_IOCT_DA0_STATUS_FFEN, PCI550X_ENABLE);
	if(rc == -1) {
		perror("ioctl PCI550X_IOCT_DA0_STATUS_FFEN");
		free(buf);
		exit(1);
	} else {
		printf("DAC0 FIFO enabled\n");
	}

	/* Set DMA Buffer Size */
	rc = ioctl(fd, PCI550X_IOCT_DAC0_DMA_BYTES, buf_size);
        if(rc == -1) {
                perror("ioctl PCI550X_IOCT_DAC0_DMA_BYTES");
		free(buf);
                exit(1);
        } else {
		printf("DMA Buffer Size: %d bytes\n", buf_size);
        }

	/* disable/enable packed data mode */
	rc = ioctl(fd, PCI550X_IOCT_DA0_PDM, packed);
	if(rc == -1) {
		perror("ioctl PCI550X_IOCT_DA0_PDM");
		free(buf);
		exit(1);
	} else {
		if (packed)
			printf("PDM enabled\n");
		else
			printf("PDM disabled\n");
	}