Added const for pointer in master_write method, so that a const array can be passed to this fcn.

Signed-off-by: wubowen <[email protected]>

Merges espressif/esp-idf#5307

explicitly convert a const ptr to non-const because we actually don't modify it.

Author: schaeferpm

components/driver/i2c.c

@@ -899,7 +899,7 @@ esp_err_t i2c_master_stop(i2c_cmd_handle_t cmd_handle)
     return i2c_cmd_link_append(cmd_handle, &cmd);
 }
 
-esp_err_t i2c_master_write(i2c_cmd_handle_t cmd_handle, uint8_t *data, size_t data_len, bool ack_en)
+esp_err_t i2c_master_write(i2c_cmd_handle_t cmd_handle, const uint8_t *data, size_t data_len, bool ack_en)
 {
     I2C_CHECK((data != NULL), I2C_ADDR_ERROR_STR, ESP_ERR_INVALID_ARG);
     I2C_CHECK(cmd_handle != NULL, I2C_CMD_LINK_INIT_ERR_STR, ESP_ERR_INVALID_ARG);
@@ -916,7 +916,7 @@ esp_err_t i2c_master_write(i2c_cmd_handle_t cmd_handle, uint8_t *data, size_t da
         cmd.hw_cmd.ack_val = 0;
         cmd.hw_cmd.op_code = I2C_CMD_WRITE;
         cmd.hw_cmd.byte_num = len_tmp;
-        cmd.data = data + data_offset;
+        cmd.data = (uint8_t*) data + data_offset;
         ret = i2c_cmd_link_append(cmd_handle, &cmd);
         data_offset += len_tmp;
         if (ret != ESP_OK) {

components/driver/include/driver/i2c.h

@@ -225,7 +225,7 @@ esp_err_t i2c_master_write_byte(i2c_cmd_handle_t cmd_handle, uint8_t data, bool
  *     - ESP_OK Success
  *     - ESP_ERR_INVALID_ARG Parameter error
  */
-esp_err_t i2c_master_write(i2c_cmd_handle_t cmd_handle, uint8_t *data, size_t data_len, bool ack_en);
+esp_err_t i2c_master_write(i2c_cmd_handle_t cmd_handle, const uint8_t *data, size_t data_len, bool ack_en);
 
 /**
  * @brief Queue command for I2C master to read one byte from I2C bus