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adcreader.cpp
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#include "adcreader.h"
#include <QDebug>
#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>
#include "gz_clk.h"
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
static void pabort(const char *s)
{
perror(s);
abort();
}
static const char *device = "/dev/spidev0.0";
static uint8_t mode = SPI_CPHA | SPI_CPOL;
static uint8_t bits = 8;
static uint32_t speed = 50000;
static uint16_t delay = 10;
static int drdy_GPIO = 22;
int inp=0;
int outp=0;
int buff[100];
static void writeReset(int fd)
{
int ret;
uint8_t tx1[5] = {0xff,0xff,0xff,0xff,0xff};
uint8_t rx1[5] = {0};
struct spi_ioc_transfer tr = {
(unsigned long)tx1,
(unsigned long)rx1,
ARRAY_SIZE(tx1),
speed,
delay,
bits,
NULL,
NULL,
};
ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
if (ret < 1)
pabort("can't send spi message");
}
static void writeReg(int fd, uint8_t v)
{
int ret;
uint8_t tx1[1];
tx1[0] = v;
uint8_t rx1[1] = {0};
struct spi_ioc_transfer tr = {
(unsigned long)tx1,
(unsigned long)rx1,
ARRAY_SIZE(tx1),
speed,
delay,
bits,
NULL,NULL,
};
ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
if (ret < 1)
pabort("can't send spi message");
}
static uint8_t readReg(int fd)
{
int ret;
uint8_t tx1[1];
tx1[0] = 0;
uint8_t rx1[1] = {0};
struct spi_ioc_transfer tr = {
(unsigned long)tx1,
(unsigned long)rx1,
ARRAY_SIZE(tx1),
speed,
delay,
8,
NULL,NULL
};
ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
if (ret < 1)
pabort("can't send spi message");
return rx1[0];
}
static int readData(int fd)
{
int ret;
uint8_t tx1[2] = {0,0};
uint8_t rx1[2] = {0,0};
struct spi_ioc_transfer tr = {
(unsigned long)tx1,
(unsigned long)rx1,
ARRAY_SIZE(tx1),
speed,
delay,
8,NULL,NULL,
};
ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
if (ret < 1)
pabort("can't send spi message");
return (rx1[0]<<8)|(rx1[1]);
}
ADCreader::ADCreader(){
//int no_tty = !isatty( fileno(stdout) );
fd = open(device, O_RDWR);
if (fd < 0)
pabort("can't open device");
/*
* spi mode
*/
ret = ioctl(fd, SPI_IOC_WR_MODE, &mode);
if (ret == -1)
pabort("can't set spi mode");
ret = ioctl(fd, SPI_IOC_RD_MODE, &mode);
if (ret == -1)
pabort("can't get spi mode");
/*
* bits per word
*/
ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
if (ret == -1)
pabort("can't set bits per word");
ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
if (ret == -1)
pabort("can't get bits per word");
/*
* max speed hz
*/
ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
if (ret == -1)
pabort("can't set max speed hz");
ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
if (ret == -1)
pabort("can't get max speed hz");
fprintf(stderr, "spi mode: %d\n", mode);
fprintf(stderr, "bits per word: %d\n", bits);
fprintf(stderr, "max speed: %d Hz (%d KHz)\n", speed, speed/1000);
// enable master clock for the AD
// divisor results in roughly 4.9MHz
// this also inits the general purpose IO
gz_clock_ena(GZ_CLK_5MHz,5);
bcm2835_gpio_fsel(drdy_GPIO, BCM2835_GPIO_FSEL_INPT);
// resets the AD7705 so that it expects a write to the communication register
writeReset(fd);
// tell the AD7705 that the next write will be to the clock register
writeReg(fd,0x20);
// write 00001100 : CLOCKDIV=1,CLK=1,expects 4.9152MHz input clock
writeReg(fd,0x0C);
// tell the AD7705 that the next write will be the setup register
writeReg(fd,0x10);
// intiates a self calibration and then after that starts converting
writeReg(fd,0x00);
running=0;
}
void ADCreader::run()
{
// we read data in an endless loop and display it
running = true;
while (running) {
int d=0;
do {
// read /DRDY of the AD converter
d = bcm2835_gpio_lev(drdy_GPIO);
// loop while /DRDY is high
} while ( d );
// tell the AD7705 to read the data register (16 bits)
writeReg(fd,0x38);
// read the data register by performing two 8 bit reads
int value = readData(fd)-0x8000;
buff[inp]=value;
//fprintf(stderr,"data = %d \n",buff[inp]);
inp=(inp+1)%100;
// if stdout is redirected to a file or pipe, output the data
/*if( no_tty )
{
printf("%d\n", value);
fflush(stdout);
}*/
//sleep(0.25);
}
}
bool ADCreader::read_enable(){
if(inp==outp){
return false;
}else{
return true;
}
}
int ADCreader::get_samples()
{
int ret=buff[outp];
//fprintf(stderr,"OUTPUT DATA = %d \n",buff[outp]);
outp=(outp+1)%100;
return ret;
}
void ADCreader::quit()
{
running = false;
exit(0);
}