求一个正点原子imx6ull能用的74hc165驱动程序
三片165级联
c
#include
#include
#include
#include
#include
#include
#define SPI_DEVICE "/dev/spidev1.0"
#define NUM_CHIPS 3
#define NUM_INPUTS 24
int main(int argc, char *argv[]) {
int spi_fd, i, j;
unsigned char tx[NUM_CHIPS] = {0};
unsigned char rx[NUM_CHIPS * 2] = {0};
struct spi_ioc_transfer tr[NUM_CHIPS];
// Open SPI device
spi_fd = open(SPI_DEVICE, O_RDWR);
if (spi_fd < 0) {
perror("Error opening SPI device");
exit(EXIT_FAILURE);
}
// Configure SPI mode and speed
int mode = SPI_MODE_0;
int speed = 1000000;
if (ioctl(spi_fd, SPI_IOC_WR_MODE, &mode) < 0) {
perror("Error setting SPI mode");
exit(EXIT_FAILURE);
}
if (ioctl(spi_fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed) < 0) {
perror("Error setting SPI speed");
exit(EXIT_FAILURE);
}
// Configure SPI transfer parameters
for (i = 0; i < NUM_CHIPS; i++) {
tr[i].tx_buf = (unsigned long)&tx[i];
tr[i].rx_buf = (unsigned long)&rx[i * 2];
tr[i].len = 2;
tr[i].delay_usecs = 0;
tr[i].speed_hz = speed;
tr[i].bits_per_word = 8;
tr[i].cs_change = 0;
}
// Read inputs from 74HC165
while (1) {
// Set first byte of tx buffer to 0 to start reading from first chip
tx[0] = 0;
// Perform SPI transfer for all chips
if (ioctl(spi_fd, SPI_IOC_MESSAGE(NUM_CHIPS), tr) < 0) {
perror("Error performing SPI transfer");
exit(EXIT_FAILURE);
}
// Parse received data and print inputs
for (i = 0; i < NUM_CHIPS; i++) {
for (j = 0; j < 8; j++) {
int input = (rx[i * 2] >> (7 - j)) & 0x01;
printf("Input %d: %d\
", i * 8 + j, input);
}
}
// Wait for a short period before reading again
usleep(100000);
}
// Close SPI device
close(spi_fd);
return 0;
}
该回答参考ChatGPT:
以下是一个基于GPIO实现的74HC165驱动程序示例，适用于使用正点原子imx6ull开发板的情况，同时支持同时使用三片74HC165级联。
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <errno.h>
#define GPIO_BASE 0x0209C000
#define GPIO_SIZE 0x1000
#define GPIO1_DR 0x00000000
#define GPIO1_GDIR 0x00000004
#define GPIO_PIN_165_SRCLK 23
#define GPIO_PIN_165_RCLK 24
#define GPIO_PIN_165_Q 25
volatile unsigned int *gpio1;
void setGpioOutput(int pin)
{
gpio1[GPIO1_GDIR] |= (1 << pin);
}
void setGpioInput(int pin)
{
gpio1[GPIO1_GDIR] &= ~(1 << pin);
}
void writeGpio(int pin, int value)
{
if (value)
gpio1[GPIO1_DR] |= (1 << pin);
else
gpio1[GPIO1_DR] &= ~(1 << pin);
}
int readGpio(int pin)
{
return (gpio1[GPIO1_DR] & (1 << pin));
}
int main(void)
{
int fd;
int i, j, value;
unsigned char data[3];
if ((fd = open("/dev/mem", O_RDWR | O_SYNC)) < 0) {
perror("open");
exit(1);
}
gpio1 = mmap(NULL, GPIO_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, GPIO_BASE);
if (gpio1 == MAP_FAILED) {
perror("mmap");
exit(1);
}
setGpioOutput(GPIO_PIN_165_SRCLK);
setGpioOutput(GPIO_PIN_165_RCLK);
setGpioInput(GPIO_PIN_165_Q);
while (1) {
for (i = 0; i < 3; i++) {
// 生成3个上升沿，每个上升沿读取一位数据
writeGpio(GPIO_PIN_165_SRCLK, 0);
writeGpio(GPIO_PIN_165_SRCLK, 1);
writeGpio(GPIO_PIN_165_SRCLK, 0);
data[i] = 0;
for (j = 0; j < 8; j++) {
writeGpio(GPIO_PIN_165_SRCLK, 0);
if (readGpio(GPIO_PIN_165_Q))
data[i] |= (1 << j);
writeGpio(GPIO_PIN_165_SRCLK, 1);
}
}
// 将3个字节的数据转换为整数
value = ((data[0] & 0xFF) << 16) | ((data[1] & 0xFF) << 8) | (data[2] & 0xFF);
// 输出读取到的数据
printf("Read value: %d\n", value);
// 生成1个上升沿，将存储的数据移入并锁存
writeGpio(GPIO_PIN_165_RCLK, 0);
writeGpio(GPIO_PIN_165_RCLK, 1);
}
munmap((void *)gpio1, GPIO_SIZE);
close(fd);
return 0;
}
请注意，此代码仅供参考，您需要根据实际情况进行修改和调整。同时，如果您使用的不是正点原子imx6ull开发板，可能需要对GPIO的寄存器地址和偏移量进行相应的修改。
该回答引用ChatGPT：以下是一个使用74hc165驱动三片级联的示例代码，代码使用C语言编写：
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
static const char *device = "/dev/spidev0.0";
static uint8_t mode = 0;
static uint8_t bits = 8;
static uint32_t speed = 1000000;
static uint16_t delay = 0;
static void pabort(const char *s)
{
perror(s);
abort();
}
int main(int argc, char *argv[])
{
int ret = 0;
int fd;
uint8_t tx[] = {0x00, 0x00, 0x00, 0x00};
uint8_t rx[ARRAY_SIZE(tx)] = {0,};
fd = open(device, O_RDWR);
if (fd < 0)
pabort("can't open device");
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");
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");
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");
struct spi_ioc_transfer tr = {
.tx_buf = (unsigned long)tx,
.rx_buf = (unsigned long)rx,
.len = ARRAY_SIZE(tx),
.delay_usecs = delay,
.speed_hz = speed,
.bits_per_word = bits,
};
tx[0] = 0xFF; // 使能第一个74hc165芯片
tx[1] = 0xFF; // 使能第二个74hc165芯片
tx[2] = 0xFF; // 使能第三个74hc165芯片
tx[3] = 0xFF; // 最后一个字节为保留位，全为1
ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
if (ret < 1)
pabort("can't send spi message");
uint32_t input = ((uint32_t)rx[0] << 24) | ((uint32_t)rx[1] << 16) | ((uint32_t)rx[2] << 8) | ((uint32_t)rx[3]);
printf("Input: 0x%x\n", input);
close(fd);
return ret;
}
这段代码使用了Linux下的SPI驱动程序，需要使用Linux系统运行。只要正点原子imx6ull支持SPI接口，并且可以运行Linux操作系统，就可以使用这个示例。需要注意的是，具体的硬件连接和配置需要根据实际情况进行调整。
以下是一个使用GPIO库编写的74HC165驱动程序的示例代码，可以在正点原子IMX6ULL开发板上使用：
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <string.h>
#include <linux/gpio.h>
#include <sys/mman.h>
// 74HC165连接的GPIO引脚
#define SHIFT_REG_CLK_PIN 50 // 时钟信号
#define SHIFT_REG_DATA_PIN 51 // 数据输入
#define SHIFT_REG_LATCH_PIN 60 // Latch信号
#define BUFFER_SIZE 8 // 存储读取的8位数据
// 初始化GPIO引脚
void init_gpio()
{
int fd;
struct gpiochip_info cinfo;
struct gpioline_info linfo;
struct gpiohandle_request req;
// 初始化时钟信号引脚
fd = open("/dev/gpiochip1", 0);
ioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &cinfo);
linfo.line_offset = SHIFT_REG_CLK_PIN;
ioctl(fd, GPIO_GET_LINEINFO_IOCTL, &linfo);
req.lineoffsets[0] = linfo.line_offset;
req.lines = 1;
req.flags = GPIOHANDLE_REQUEST_OUTPUT;
req.default_values[0] = 0;
ioctl(fd, GPIO_GET_LINEHANDLE_IOCTL, &req);
close(fd);
// 初始化数据输入引脚
fd = open("/dev/gpiochip1", 0);
ioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &cinfo);
linfo.line_offset = SHIFT_REG_DATA_PIN;
ioctl(fd, GPIO_GET_LINEINFO_IOCTL, &linfo);
req.lineoffsets[0] = linfo.line_offset;
req.lines = 1;
req.flags = GPIOHANDLE_REQUEST_INPUT;
ioctl(fd, GPIO_GET_LINEHANDLE_IOCTL, &req);
close(fd);
// 初始化Latch信号引脚
fd = open("/dev/gpiochip2", 0);
ioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &cinfo);
linfo.line_offset = SHIFT_REG_LATCH_PIN;
ioctl(fd, GPIO_GET_LINEINFO_IOCTL, &linfo);
req.lineoffsets[0] = linfo.line_offset;
req.lines = 1;
req.flags = GPIOHANDLE_REQUEST_OUTPUT;
req.default_values[0] = 0;
ioctl(fd, GPIO_GET_LINEHANDLE_IOCTL, &req);
close(fd);
}
// 读取74HC165中的数据
void read_shift_register(uint8_t *data_buffer)
{
int fd;
struct gpiohandle_data data;
struct spi_ioc_transfer xfer;
uint8_t tx[1] = {0x00};
uint8_t rx[BUFFER_SIZE];
// 将Latch信号置为低电平
fd = open("/dev/gpiochip2", 0);
data.values[0] = 0;
ioctl(fd, GPIOHANDLE_SET_LINE_VALUES_IOCTL, &data);
close(fd);
// 逐位读取数据
for (int i = 0; i < BUFFER_SIZE; i++) {
// 将时钟信号置为低电平
fd = open("/dev/gpiochip1", 0);
data.values[0] = 0;