66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
#include "iic.h"
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#include "driver/i2c_master.h"
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#include "esp_log.h"
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#include <stdint.h>
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static const char *TAG = "IIC";
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static i2c_master_bus_handle_t s_iic_bus = NULL;
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static i2c_master_dev_handle_t s_iic_dev = NULL;
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esp_err_t iic_init(void)
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{
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i2c_master_bus_config_t bus_cfg = {
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.i2c_port = -1,
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.sda_io_num = (gpio_num_t)IIC_SDA_IO,
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.scl_io_num = (gpio_num_t)IIC_SCL_IO,
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.clk_source = I2C_CLK_SRC_DEFAULT,
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.glitch_ignore_cnt = 7,
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.trans_queue_depth = 0,
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.flags.enable_internal_pullup = true,
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};
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esp_err_t ret = i2c_new_master_bus(&bus_cfg, &s_iic_bus);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "IIC总线初始化失败");
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return ret;
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}
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i2c_device_config_t dev_cfg = {
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.dev_addr_length = I2C_ADDR_BIT_LEN_7,
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.device_address = 0x00,
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.scl_speed_hz = IIC_FREQ_HZ,
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};
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ret = i2c_master_bus_add_device(s_iic_bus, &dev_cfg, &s_iic_dev);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "IIC总线初始化失败");
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return ret;
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}
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ESP_LOGI(TAG, "IIC IO总线初始化成功");
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return ESP_OK;
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}
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esp_err_t iic_send_bytes(unsigned char addr, unsigned char *txd, unsigned int len)
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{
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if (txd == NULL || len == 0 || s_iic_dev == NULL) {
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return ESP_ERR_INVALID_STATE;
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}
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esp_err_t ret = i2c_master_device_change_address(s_iic_dev, (uint16_t)addr, IIC_TIMEOUT_MS);
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if (ret != ESP_OK) {
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return ret;
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}
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return i2c_master_transmit(s_iic_dev, (const uint8_t *)txd, (size_t)len, IIC_TIMEOUT_MS);
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}
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unsigned char iic_read_byte(unsigned char addr)
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{
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uint8_t byte = 0;
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if (s_iic_dev == NULL) {
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return 0;
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}
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if (i2c_master_device_change_address(s_iic_dev, (uint16_t)addr, IIC_TIMEOUT_MS) != ESP_OK) {
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return 0;
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}
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i2c_master_receive(s_iic_dev, &byte, 1, IIC_TIMEOUT_MS);
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return (unsigned char)byte;
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}
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