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#include <stdlib.h>
#include <esp_log.h>
#include <driver/i2c.h>
#include "eos.h"
static const char *TAG = "EOS I2C";
#define I2C_MASTER_NUM I2C_NUM_0
#define I2C_MASTER_FREQ_HZ 100000
#define I2C_MASTER_GPIO_SCL 25
#define I2C_MASTER_GPIO_SDA 26
#define I2C_MASTER_TX_BUF_DISABLE 0 /*!< I2C master doesn't need buffer */
#define I2C_MASTER_RX_BUF_DISABLE 0 /*!< I2C master doesn't need buffer */
#define ACK_CHECK_EN 0x1 /*!< I2C master will check ack from slave*/
#define ACK_CHECK_DIS 0x0 /*!< I2C master will not check ack from slave */
#define ACK_VAL 0x0 /*!< I2C ack value */
#define NCK_VAL 0x1 /*!< I2C nack value */
/**
* @brief i2c initialization
*/
void eos_i2c_init(void) {
i2c_config_t conf;
conf.mode = I2C_MODE_MASTER;
conf.sda_io_num = I2C_MASTER_GPIO_SDA;
conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
conf.scl_io_num = I2C_MASTER_GPIO_SCL;
conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
conf.master.clk_speed = I2C_MASTER_FREQ_HZ;
i2c_param_config(I2C_MASTER_NUM, &conf);
i2c_driver_install(I2C_MASTER_NUM, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
ESP_LOGI(TAG, "INIT");
}
/**
* @brief i2c read
*/
int eos_i2c_read(uint8_t addr, uint8_t reg, uint8_t *data, size_t len) {
int i, ret;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, addr << 1 | I2C_MASTER_WRITE, ACK_CHECK_EN);
i2c_master_write_byte(cmd, reg, ACK_CHECK_EN);
i2c_master_start(cmd);
i2c_master_write_byte(cmd, addr << 1 | I2C_MASTER_READ, ACK_CHECK_EN);
for (i=0; i < len - 1; i++) {
i2c_master_read_byte(cmd, data+i, ACK_VAL);
}
i2c_master_read_byte(cmd, data+i, NCK_VAL);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if (ret != ESP_OK) {
return EOS_ERR;
}
return EOS_OK;
}
/**
* @brief i2c read8
*/
uint8_t eos_i2c_read8(uint8_t addr, uint8_t reg) {
uint8_t data;
eos_i2c_read(addr, reg, &data, 1);
return data;
}
/**
* @brief i2c write
*/
int eos_i2c_write(uint8_t addr, uint8_t reg, uint8_t *data, size_t len) {
int i, ret;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, addr << 1 | I2C_MASTER_WRITE, ACK_CHECK_EN);
i2c_master_write_byte(cmd, reg, ACK_CHECK_EN);
for (i=0; i < len; i++) {
i2c_master_write_byte(cmd, *(data+i), ACK_CHECK_EN);
}
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if (ret != ESP_OK) {
return EOS_ERR;
}
return EOS_OK;
}
/**
* @brief i2c write8
*/
void eos_i2c_write8(uint8_t addr, uint8_t reg, uint8_t data) {
eos_i2c_write(addr, reg, &data, 1);
}
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