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eeprom.c
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#include "eeprom.h"
/**
* @brief I2C master initialization
*/
esp_err_t init_i2c_master() {
int i2c_master_port = I2C_MASTER_NUM;
esp_err_t ret;
i2c_config_t config;
config.mode = I2C_MODE_MASTER;
config.sda_io_num = I2C_MASTER_SDA_IO;
config.scl_io_num = I2C_MASTER_SCL_IO;
config.sda_pullup_en = PULLUP_SDA_GPIO;
config.scl_pullup_en = PULLUP_SCL_GPIO;
config.master.clk_speed = I2C_MASTER_FREQ_HZ;
ret = i2c_param_config(i2c_master_port, &config);
if(ret != ESP_OK) {
return ret;
}
ret = i2c_driver_install(i2c_master_port, config.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
return ret;
}
/**
* @brief Write one byte to EEPROM.
*
* ___________________________________________________________________________________________________________
* | start | slave_addr + wr_bit + ack | high_byte_aadr + ack | low_byte_addr + ack | data_byte + ack | stop |
* |-------|---------------------------|----------------------|---------------------|-----------------|------|
*
*/
esp_err_t eeprom_write_byte(uint8_t deviceaddress, uint16_t eeaddress, uint8_t byte) {
esp_err_t ret;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (deviceaddress << 1) | EEPROM_WRITE_ADDR, ACK_CHECK_EN);
i2c_master_write_byte(cmd, eeaddress >> 8, ACK_CHECK_EN);
i2c_master_write_byte(cmd, eeaddress & 0xFF, ACK_CHECK_EN);
i2c_master_write_byte(cmd, byte, ACK_CHECK_EN);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd);
return ret;
}
/**
* @brief Write a few bytes to EEPROM.
*
* _______________________________________________________________________________________________________________________________________
* | start | slave_addr + wr_bit + ack | high_byte_aadr + ack | low_byte_addr + ack | data_byte0 + ack | ... | data_byte127 + ack | stop |
* |-------|---------------------------|----------------------|---------------------|------------------|-----|--------------------|------|
*
*/
esp_err_t eeprom_write(uint8_t deviceaddress, uint16_t eeaddress, uint8_t *data, size_t size) {
esp_err_t ret = ESP_OK;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (deviceaddress << 1) | EEPROM_WRITE_ADDR, ACK_CHECK_EN);
i2c_master_write_byte(cmd, eeaddress >> 8, ACK_CHECK_EN);
i2c_master_write_byte(cmd, eeaddress & 0xFF, ACK_CHECK_EN);
int bytes_remaining = size;
int current_address = eeaddress;
int first_write_size = ( (EEPROM_PAGE_SIZE - 1) - eeaddress % (EEPROM_PAGE_SIZE - 1) ) + 1;
if (eeaddress % (EEPROM_PAGE_SIZE-1) == 0 && eeaddress != 0) {
first_write_size = 1;
}
if (bytes_remaining <= first_write_size) {
i2c_master_write(cmd, data, bytes_remaining, 1);
}
else {
i2c_master_write(cmd, data, first_write_size, 1);
bytes_remaining -= first_write_size;
current_address += first_write_size;
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000/portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd);
if (ret != ESP_OK) {
return ret;
}
while (bytes_remaining > 0) {
cmd = i2c_cmd_link_create();
// 2ms delay period to allow EEPROM to write the page buffer to memory.
vTaskDelay(20 / portTICK_PERIOD_MS);
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (deviceaddress << 1) | EEPROM_WRITE_ADDR, ACK_CHECK_EN);
i2c_master_write_byte(cmd, current_address >> 8, ACK_CHECK_EN);
i2c_master_write_byte(cmd, current_address & 0xFF, ACK_CHECK_EN);
if (bytes_remaining <= EEPROM_PAGE_SIZE) {
i2c_master_write(cmd, data + (size - bytes_remaining), bytes_remaining, ACK_CHECK_EN);
bytes_remaining = 0;
}
else {
i2c_master_write(cmd, data + (size - bytes_remaining), EEPROM_PAGE_SIZE, ACK_CHECK_EN);
bytes_remaining -= EEPROM_PAGE_SIZE;
current_address += EEPROM_PAGE_SIZE;
}
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd);
if (ret != ESP_OK) {
return ret;
}
}
}
return ret;
}
/**
* @brief Read random byte from EEPROM
*
* __________________________________________________________________________________________________________________________________________________
* | start | slave_addr + wr_bit + ack | high_byte_addr + ack | low_byte_addr + ack | start | slave_addr + rd_bit + ack | read 1 byte + nack | stop |
* |-------|---------------------------|----------------------|---------------------|-------|---------------------------|--------------------|------|
*
*/
esp_err_t eeprom_read_byte(uint8_t deviceaddress, uint16_t eeaddress, uint8_t *byte) {
esp_err_t ret;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (deviceaddress << 1) | EEPROM_WRITE_ADDR, ACK_CHECK_EN);
i2c_master_write_byte(cmd, eeaddress << 8, ACK_CHECK_EN);
i2c_master_write_byte(cmd, eeaddress & 0xFF, ACK_CHECK_EN);
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (deviceaddress << 1) | EEPROM_READ_ADDR, ACK_CHECK_EN);
i2c_master_read_byte(cmd, byte, NACK_VAL);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000/portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd);
return ret;
}
/**
* @brief Read byte sequential from EEPROM
*
* ____________________________________________________________________________________________________________________________________________________________________________
* | start | slave_addr + wr_bit + ack | high_byte_addr + ack | low_byte_addr + ack | start | slave_addr + rd_bit + ack | read byte_1 + ack | ... | read byte_x + nack | stop |
* |-------|---------------------------|----------------------|---------------------|-------|---------------------------|-------------------|-----|--------------------|------|
*
*/
esp_err_t eeprom_read(uint8_t deviceaddress, uint16_t eeaddress, uint8_t *data, size_t size) {
esp_err_t ret;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (deviceaddress << 1) | EEPROM_WRITE_ADDR, ACK_CHECK_EN);
i2c_master_write_byte(cmd, eeaddress << 8, ACK_CHECK_EN);
i2c_master_write_byte(cmd, eeaddress & 0xFF, ACK_CHECK_EN);
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (deviceaddress << 1) | EEPROM_READ_ADDR, ACK_CHECK_EN);
if (size > 1) {
i2c_master_read(cmd, data, size - 1, ACK_VAL);
}
i2c_master_read_byte(cmd, data + size - 1, NACK_VAL);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd);
return ret;
}