153 lines
2.8 KiB
C
153 lines
2.8 KiB
C
/*
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* i2c - 用户界面
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*
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* 这里已经提供了I2C通用接口，可以将上层代码移动到仓颉下面
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <fcntl.h>
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#ifdef __linux__
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <linux/i2c-dev.h> /* 其中宏的取值可能具有平台特异性 */
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#include <i2c/smbus.h>
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#endif
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#include "bot4cj.h" /* 有没有可能在仓颉代码中解析C头文件取得宏 */
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/*
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* 初始化i2c设备
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*
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* 动态指定设备文件
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*
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* 返回打开的文件句柄或者错误码
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*/
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#ifdef __linux__
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int16_t I2C_init(const char* filepath) {
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int16_t fd;
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if ((fd = open(filepath, O_RDWR)) < 0) {
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perror("Failed to open I2C bus");
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return BOT4CJ_I2C_OPENED_FAILED;
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}
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else {
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return fd;
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}
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}
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#endif
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#ifdef _WIN64
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int16_t I2C_init(const char* filepath) {
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return BOT4CJ_I2C_OPENED_FAILED;
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}
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#endif
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/* 释放I2C设备文件 */
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#ifdef __linux__
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void I2C_free(int16_t fd) {
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close(fd);
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}
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#endif
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#ifdef _WIN64
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void I2C_free(int16_t fd) {
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/* Windows平台下无需操作 */
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}
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#endif
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/* 设置I2C地址 */
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#ifdef __linux__
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int I2C_setAddr(int16_t fd, uint8_t addr) {
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if (ioctl(fd, I2C_SLAVE, addr) < 0) {
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perror("Failed to set I2C address");
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return BOT4CJ_I2C_ERR;
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}
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else {
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return BOT4CJ_I2C_OK;
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}
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}
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#endif
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#ifdef _WIN64
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int I2C_setAddr(int16_t fd, uint8_t addr) {
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return BOT4CJ_I2C_ERR;
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}
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#endif
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/* 写寄存器 */
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#ifdef __linux__
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int I2C_writeReg(int16_t fd, uint8_t reg, uint8_t val) {
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/*uint8_t buf[] = {reg, val};
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if (write(fd, buf, 2) != 2) {
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perror("I2C write error");
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return BOT4CJ_I2C_ERR;
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}
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else {
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return BOT4CJ_I2C_OK;
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}*/
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return i2c_smbus_write_byte_data(fd, reg, val);
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}
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#endif
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#ifdef _WIN64
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int I2C_writeReg(int16_t fd, uint8_t reg, uint8_t val) {
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return BOT4CJ_I2C_ERR;
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}
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#endif
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/* 读寄存器 失败返回0 */
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#ifdef __linux__
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uint8_t I2C_readReg(int16_t fd, uint8_t reg) {
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uint8_t value;
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/*if (write(fd, ®, 1) != 1) {
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perror("I2C read error");
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return 0;
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}
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if (read(fd, &value, 1)!= 1) {
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perror("I2C read error");
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return 0;
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}*/
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//return value;
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int8_t a = i2c_smbus_read_byte_data(fd, reg);
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return *(uint8_t *)& a;
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}
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#endif
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#ifdef _WIN64
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uint8_t I2C_readReg(int16_t fd, uint8_t reg) {
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return 0;
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}
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#endif
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/* 读寄存器 - 有符号
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* 失败返回0 */
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#ifdef __linux__
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int8_t I2C_readRegFlag(int16_t fd, uint8_t reg) {
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int8_t value;
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//if (write(fd, ®, 1) != 1) {
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//perror("I2C read error");
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//return 0;
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//}
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//if (read(fd, &value, 1)!= 1) {
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//perror("I2C read error");
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//return 0;
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//}
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//return value;
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return i2c_smbus_read_byte_data(fd, reg);
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}
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#endif
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#ifdef _WIN64
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int8_t I2C_readRegFlag(int16_t fd, uint8_t reg) {
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return 0;
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}
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#endif
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