Implement i2c_master_multi_buffer_transmit_receive()

components/esp_driver_i2c/i2c_master.c

@@ -1320,6 +1320,51 @@ esp_err_t i2c_master_transmit_receive(i2c_master_dev_handle_t i2c_dev, const uin
     return ret;
 }
 
+esp_err_t i2c_master_multi_buffer_transmit_receive(i2c_master_dev_handle_t i2c_dev, i2c_master_transmit_multi_buffer_info_t *buffer_info_array, size_t array_size, uint8_t *read_buffer, size_t read_size, int xfer_timeout_ms)
+{
+    ESP_RETURN_ON_FALSE(i2c_dev != NULL, ESP_ERR_INVALID_ARG, TAG, "i2c handle not initialized");
+    ESP_RETURN_ON_FALSE(array_size <= (SOC_I2C_CMD_REG_NUM - 2 - 3), ESP_ERR_INVALID_ARG, TAG, "i2c command list cannot contain so many commands");
+    ESP_RETURN_ON_FALSE(buffer_info_array != NULL, ESP_ERR_INVALID_ARG, TAG, "buffer info array is empty");
+
+    esp_err_t ret = ESP_OK;
+    size_t op_index = 0;
+    i2c_operation_t i2c_ops[SOC_I2C_CMD_REG_NUM] = {};
+    i2c_ops[op_index++].hw_cmd.op_code = I2C_LL_CMD_RESTART;
+    int i;
+    for (i = 0; i < array_size; i++) {
+        if (buffer_info_array[i].buffer_size == 0) {
+            continue;
+        }
+        i2c_ops[op_index].hw_cmd.ack_en = i2c_dev->ack_check_disable ? false : true;
+        i2c_ops[op_index].hw_cmd.op_code = I2C_LL_CMD_WRITE;
+        i2c_ops[op_index].data = (uint8_t*)buffer_info_array[i].write_buffer;
+        i2c_ops[op_index].total_bytes = buffer_info_array[i].buffer_size;
+        i2c_ops[op_index].bytes_used = 0;
+        op_index++;
+    }
+
+    i2c_ops[op_index++].hw_cmd.op_code = I2C_LL_CMD_RESTART;
+
+    i2c_ops[op_index].hw_cmd.op_code = I2C_LL_CMD_READ;
+    i2c_ops[op_index].hw_cmd.ack_val = I2C_ACK_VAL;
+    i2c_ops[op_index].data = read_buffer;
+    i2c_ops[op_index++].total_bytes = read_size - 1;
+
+    i2c_ops[op_index].hw_cmd.op_code = I2C_LL_CMD_READ;
+    i2c_ops[op_index].hw_cmd.ack_val = I2C_NACK_VAL;
+    i2c_ops[op_index].data = (read_buffer + read_size - 1);
+    i2c_ops[op_index++].total_bytes = 1;
+
+    i2c_ops[op_index++].hw_cmd.op_code = I2C_LL_CMD_STOP;
+
+    if (i2c_dev->master_bus->async_trans == false) {
+        ret = s_i2c_synchronous_transaction(i2c_dev, i2c_ops, op_index, xfer_timeout_ms);
+    } else {
+        ret = s_i2c_asynchronous_transaction(i2c_dev, i2c_ops, op_index, xfer_timeout_ms);
+    }
+    return ret;
+}
+
 esp_err_t i2c_master_receive(i2c_master_dev_handle_t i2c_dev, uint8_t *read_buffer, size_t read_size, int xfer_timeout_ms)
 {
     ESP_RETURN_ON_FALSE(i2c_dev != NULL, ESP_ERR_INVALID_ARG, TAG, "i2c handle not initialized");

components/esp_driver_i2c/include/driver/i2c_master.h

@@ -214,6 +214,29 @@ esp_err_t i2c_master_multi_buffer_transmit(i2c_master_dev_handle_t i2c_dev, i2c_
  */
 esp_err_t i2c_master_transmit_receive(i2c_master_dev_handle_t i2c_dev, const uint8_t *write_buffer, size_t write_size, uint8_t *read_buffer, size_t read_size, int xfer_timeout_ms);
 
+/**
+ * @brief Perform a multi-write-read transaction on the I2C bus.
+ *        This function transmits multiple buffers of data and then reads.
+ *        The transaction will be undergoing until it finishes or it reaches
+ *        the timeout provided.
+ *
+ * @note If a callback was registered with `i2c_master_register_event_callbacks`, the transaction will be asynchronous, and thus, this function will return directly, without blocking.
+ *       You will get finish information from callback. Besides, data buffer should always be completely prepared when callback is registered, otherwise, the data will get corrupt.
+ *
+ * @param[in] i2c_dev I2C master device handle that created by `i2c_master_bus_add_device`.
+ * @param[in] buffer_info_array Pointer to buffer information array.
+ * @param[in] array_size size of buffer information array.
+ * @param[out] read_buffer Data bytes received from i2c bus.
+ * @param[in] read_size Size, in bytes, of the read buffer.
+ * @param[in] xfer_timeout_ms Wait timeout, in ms. Note: -1 means wait forever.
+ * @return
+ *      - ESP_OK: I2C master transmit-receive success.
+ *      - ESP_ERR_INVALID_RESPONSE: I2C master transmit-receive receives NACK.
+ *      - ESP_ERR_INVALID_ARG: I2C master transmit parameter invalid.
+ *      - ESP_ERR_TIMEOUT: Operation timeout(larger than xfer_timeout_ms) because the bus is busy or hardware crash.
+ */
+esp_err_t i2c_master_multi_buffer_transmit_receive(i2c_master_dev_handle_t i2c_dev, i2c_master_transmit_multi_buffer_info_t *buffer_info_array, size_t array_size, uint8_t *read_buffer, size_t read_size, int xfer_timeout_ms);
+
 /**
  * @brief Perform a read transaction on the I2C bus.
  *        The transaction will be undergoing until it finishes or it reaches