drivers/serial/uart_stm32.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2016 Open-RnD Sp. z o.o.
  * Copyright (c) 2016 Linaro Limited.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 /**
  * @brief Driver for UART port on STM32F10x family processor.
  *
  * Based on reference manual:
  *   STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and STM32F107xx
  *   advanced ARM ® -based 32-bit MCUs
  *
  * Chapter 27: Universal synchronous asynchronous receiver
  *             transmitter (USART)
  */

 #include <kernel.h>
 #include <arch/cpu.h>
 #include <misc/__assert.h>
 #include <board.h>
 #include <init.h>
 #include <uart.h>
 #include <clock_control.h>

 #include <sections.h>
 #include <clock_control/stm32_clock_control.h>
 #include "uart_stm32.h"

 /* convenience defines */
 #define DEV_CFG(dev)							\
 	((const struct uart_stm32_config * const)(dev)->config->config_info)
 #define DEV_DATA(dev)							\
 	((struct uart_stm32_data * const)(dev)->driver_data)
 #define UART_STRUCT(dev)					\
 	((USART_TypeDef *)(DEV_CFG(dev))->uconf.base)


 #define TIMEOUT 1000

 static int uart_stm32_poll_in(struct device *dev, unsigned char *c)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	if (HAL_UART_Receive(UartHandle, (uint8_t *)c, 1, TIMEOUT) == HAL_OK) {
 		return 0;
 	} else {
 		return -1;
 	}
 }

 static unsigned char uart_stm32_poll_out(struct device *dev,
 					unsigned char c)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	HAL_UART_Transmit(UartHandle, (uint8_t *)&c, 1, TIMEOUT);

 	return c;
 }

 static inline void __uart_stm32_get_clock(struct device *dev)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	struct device *clk =
 		device_get_binding(STM32_CLOCK_CONTROL_NAME);

 	__ASSERT_NO_MSG(clk);

 	data->clock = clk;
 }

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN

 static int uart_stm32_fifo_fill(struct device *dev, const uint8_t *tx_data,
 				  int size)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;
 	uint8_t num_tx = 0;

 	while ((size - num_tx > 0) && __HAL_UART_GET_FLAG(UartHandle,
 		UART_FLAG_TXE)) {
 		/* TXE flag will be cleared with byte write to DR register */

 		/* Send a character (8bit , parity none) */
 #if defined(CONFIG_SOC_SERIES_STM32F1X) || defined(CONFIG_SOC_SERIES_STM32F4X)
 		/* Use direct access for F1, F4 until Low Level API is available
 		 * Once it is we can remove the if/else
 		 */
 		UartHandle->Instance->DR = (tx_data[num_tx++] &
 					(uint8_t)0x00FF);
 #else
 		LL_USART_TransmitData8(UartHandle->Instance, tx_data[num_tx++]);
 #endif
 	}

 	return num_tx;
 }

 static int uart_stm32_fifo_read(struct device *dev, uint8_t *rx_data,
 				  const int size)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;
 	uint8_t num_rx = 0;

 	while ((size - num_rx > 0) && __HAL_UART_GET_FLAG(UartHandle,
 		UART_FLAG_RXNE)) {
 		/* Clear the interrupt */
 		__HAL_UART_CLEAR_FLAG(UartHandle, UART_FLAG_RXNE);

 		/* Receive a character (8bit , parity none) */
 #if defined(CONFIG_SOC_SERIES_STM32F1X) || defined(CONFIG_SOC_SERIES_STM32F4X)
 		/* Use direct access for F1, F4 until Low Level API is available
 		 * Once it is we can remove the if/else
 		 */
 		rx_data[num_rx++] = (uint8_t)(UartHandle->Instance->DR &
 					(uint8_t)0x00FF);
 #else
 		rx_data[num_rx++] = LL_USART_ReceiveData8(UartHandle->Instance);
 #endif
 	}
 	return num_rx;
 }

 static void uart_stm32_irq_tx_enable(struct device *dev)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	__HAL_UART_ENABLE_IT(UartHandle, UART_IT_TC);
 }

 static void uart_stm32_irq_tx_disable(struct device *dev)
 {
 	 struct uart_stm32_data *data = DEV_DATA(dev);
 	 UART_HandleTypeDef *UartHandle = &data->huart;

 	__HAL_UART_DISABLE_IT(UartHandle, UART_IT_TC);
 }

 static int uart_stm32_irq_tx_ready(struct device *dev)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	return __HAL_UART_GET_FLAG(UartHandle, UART_FLAG_TXE);
 }

 static int uart_stm32_irq_tx_empty(struct device *dev)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	return __HAL_UART_GET_FLAG(UartHandle, UART_FLAG_TXE);
 }

 static void uart_stm32_irq_rx_enable(struct device *dev)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	__HAL_UART_ENABLE_IT(UartHandle, UART_IT_RXNE);
 }

 static void uart_stm32_irq_rx_disable(struct device *dev)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	__HAL_UART_DISABLE_IT(UartHandle, UART_IT_RXNE);
 }

 static int uart_stm32_irq_rx_ready(struct device *dev)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	return __HAL_UART_GET_FLAG(UartHandle, UART_FLAG_RXNE);
 }

 static void uart_stm32_irq_err_enable(struct device *dev)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	/* Enable FE, ORE interruptions */
 	__HAL_UART_ENABLE_IT(UartHandle, UART_IT_ERR);
 	/* Enable Line break detection */
 	__HAL_UART_ENABLE_IT(UartHandle, UART_IT_LBD);
 	/* Enable parity error interruption */
 	__HAL_UART_ENABLE_IT(UartHandle, UART_IT_PE);
 }

 static void uart_stm32_irq_err_disable(struct device *dev)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	/* Disable FE, ORE interruptions */
 	__HAL_UART_DISABLE_IT(UartHandle, UART_IT_ERR);
 	/* Disable Line break detection */
 	__HAL_UART_DISABLE_IT(UartHandle, UART_IT_LBD);
 	/* Disable parity error interruption */
 	__HAL_UART_DISABLE_IT(UartHandle, UART_IT_PE);
 }

 static int uart_stm32_irq_is_pending(struct device *dev)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	return __HAL_UART_GET_FLAG(UartHandle, UART_FLAG_TXE | UART_FLAG_RXNE);
 }

 static int uart_stm32_irq_update(struct device *dev)
 {
 	 struct uart_stm32_data *data = DEV_DATA(dev);
 	 UART_HandleTypeDef *UartHandle = &data->huart;

 	__HAL_UART_CLEAR_FLAG(UartHandle, UART_FLAG_TC);

 	return 1;
 }

 static void uart_stm32_irq_callback_set(struct device *dev,
 					uart_irq_callback_t cb)
 {
 	struct uart_stm32_data *data = DEV_DATA(dev);

 	data->user_cb = cb;
 }

 static void uart_stm32_isr(void *arg)
 {
 	struct device *dev = arg;
 	struct uart_stm32_data *data = DEV_DATA(dev);

 	if (data->user_cb) {
 		data->user_cb(dev);
 	}
 }

 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */

 static const struct uart_driver_api uart_stm32_driver_api = {
 	.poll_in = uart_stm32_poll_in,
 	.poll_out = uart_stm32_poll_out,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.fifo_fill = uart_stm32_fifo_fill,
 	.fifo_read = uart_stm32_fifo_read,
 	.irq_tx_enable = uart_stm32_irq_tx_enable,
 	.irq_tx_disable = uart_stm32_irq_tx_disable,
 	.irq_tx_ready = uart_stm32_irq_tx_ready,
 	.irq_tx_empty = uart_stm32_irq_tx_empty,
 	.irq_rx_enable = uart_stm32_irq_rx_enable,
 	.irq_rx_disable = uart_stm32_irq_rx_disable,
 	.irq_rx_ready = uart_stm32_irq_rx_ready,
 	.irq_err_enable = uart_stm32_irq_err_enable,
 	.irq_err_disable = uart_stm32_irq_err_disable,
 	.irq_is_pending = uart_stm32_irq_is_pending,
 	.irq_update = uart_stm32_irq_update,
 	.irq_callback_set = uart_stm32_irq_callback_set,
 #endif	/* CONFIG_UART_INTERRUPT_DRIVEN */
 };

 /**
  * @brief Initialize UART channel
  *
  * This routine is called to reset the chip in a quiescent state.
  * It is assumed that this function is called only once per UART.
  *
  * @param dev UART device struct
  *
  * @return 0
  */
 static int uart_stm32_init(struct device *dev)
 {
 	const struct uart_stm32_config *config = DEV_CFG(dev);
 	struct uart_stm32_data *data = DEV_DATA(dev);
 	UART_HandleTypeDef *UartHandle = &data->huart;

 	__uart_stm32_get_clock(dev);
 	/* enable clock */
 #if defined(CONFIG_SOC_SERIES_STM32F1X) || defined(CONFIG_SOC_SERIES_STM32L4X)
 	clock_control_on(data->clock, config->clock_subsys);
 #elif defined(CONFIG_SOC_SERIES_STM32F4X)
 	clock_control_on(data->clock,
 			(clock_control_subsys_t *)&config->pclken);
 #endif

 	UartHandle->Instance = UART_STRUCT(dev);
 	UartHandle->Init.WordLength = UART_WORDLENGTH_8B;
 	UartHandle->Init.StopBits = UART_STOPBITS_1;
 	UartHandle->Init.Parity = UART_PARITY_NONE;
 	UartHandle->Init.HwFlowCtl = UART_HWCONTROL_NONE;
 	UartHandle->Init.Mode = UART_MODE_TX_RX;
 	UartHandle->Init.OverSampling = UART_OVERSAMPLING_16;

 	HAL_UART_Init(UartHandle);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	config->uconf.irq_config_func(dev);
 #endif
 	return 0;
 }


 #ifdef CONFIG_UART_STM32_PORT_1

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_stm32_irq_config_func_1(struct device *dev);
 #endif	/* CONFIG_UART_INTERRUPT_DRIVEN */

 static const struct uart_stm32_config uart_stm32_dev_cfg_1 = {
 	.uconf = {
 		.base = (uint8_t *)USART1_BASE,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 		.irq_config_func = uart_stm32_irq_config_func_1,
 #endif	/* CONFIG_UART_INTERRUPT_DRIVEN */
 	},
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 	.clock_subsys = UINT_TO_POINTER(STM32F10X_CLOCK_SUBSYS_USART1),
 #elif CONFIG_SOC_SERIES_STM32F4X
 	.pclken = { .bus = STM32F4X_CLOCK_BUS_APB2,
 		    .enr = STM32F4X_CLOCK_ENABLE_USART1 },
 #elif CONFIG_SOC_SERIES_STM32L4X
 	.clock_subsys = UINT_TO_POINTER(STM32L4X_CLOCK_SUBSYS_USART1),
 #endif	/* CONFIG_SOC_SERIES_STM32FX */
 };

 static struct uart_stm32_data uart_stm32_dev_data_1 = {
 	.huart = {
 		.Init = {
 			.BaudRate = CONFIG_UART_STM32_PORT_1_BAUD_RATE} }
 };

 DEVICE_AND_API_INIT(uart_stm32_1, CONFIG_UART_STM32_PORT_1_NAME,
 		    &uart_stm32_init,
 		    &uart_stm32_dev_data_1, &uart_stm32_dev_cfg_1,
 		    PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
 		    &uart_stm32_driver_api);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_stm32_irq_config_func_1(struct device *dev)
 {
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 #define PORT_1_IRQ STM32F1_IRQ_USART1
 #elif CONFIG_SOC_SERIES_STM32F4X
 #define PORT_1_IRQ STM32F4_IRQ_USART1
 #elif CONFIG_SOC_SERIES_STM32L4X
 #define PORT_1_IRQ STM32L4_IRQ_USART1
 #endif
 	IRQ_CONNECT(PORT_1_IRQ,
 		CONFIG_UART_STM32_PORT_1_IRQ_PRI,
 		uart_stm32_isr, DEVICE_GET(uart_stm32_1),
 		0);
 	irq_enable(PORT_1_IRQ);
 }
 #endif	/* CONFIG_UART_INTERRUPT_DRIVEN */

 #endif	/* CONFIG_UART_STM32_PORT_1 */


 #ifdef CONFIG_UART_STM32_PORT_2

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_stm32_irq_config_func_2(struct device *dev);
 #endif	/* CONFIG_UART_INTERRUPT_DRIVEN */

 static const struct uart_stm32_config uart_stm32_dev_cfg_2 = {
 	.uconf = {
 		.base = (uint8_t *)USART2_BASE,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 		.irq_config_func = uart_stm32_irq_config_func_2,
 #endif	/* CONFIG_UART_INTERRUPT_DRIVEN */
 	},
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 	.clock_subsys = UINT_TO_POINTER(STM32F10X_CLOCK_SUBSYS_USART2),
 #elif CONFIG_SOC_SERIES_STM32F4X
 	.pclken = { .bus = STM32F4X_CLOCK_BUS_APB1,
 		    .enr = STM32F4X_CLOCK_ENABLE_USART2 },
 #elif CONFIG_SOC_SERIES_STM32L4X
 	.clock_subsys = UINT_TO_POINTER(STM32L4X_CLOCK_SUBSYS_USART2),
 #endif	/* CONFIG_SOC_SERIES_STM32FX */
 };

 static struct uart_stm32_data uart_stm32_dev_data_2 = {
 	.huart = {
 		.Init = {
 			.BaudRate = CONFIG_UART_STM32_PORT_2_BAUD_RATE} }
 };

 DEVICE_AND_API_INIT(uart_stm32_2, CONFIG_UART_STM32_PORT_2_NAME,
 		    &uart_stm32_init,
 		    &uart_stm32_dev_data_2, &uart_stm32_dev_cfg_2,
 		    PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
 		    &uart_stm32_driver_api);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_stm32_irq_config_func_2(struct device *dev)
 {
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 #define PORT_2_IRQ STM32F1_IRQ_USART2
 #elif CONFIG_SOC_SERIES_STM32F4X
 #define PORT_2_IRQ STM32F4_IRQ_USART2
 #elif CONFIG_SOC_SERIES_STM32L4X
 #define PORT_2_IRQ STM32L4_IRQ_USART2
 #endif
 	IRQ_CONNECT(PORT_2_IRQ,
 		CONFIG_UART_STM32_PORT_2_IRQ_PRI,
 		uart_stm32_isr, DEVICE_GET(uart_stm32_2),
 		0);
 	irq_enable(PORT_2_IRQ);
 }
 #endif	/* CONFIG_UART_INTERRUPT_DRIVEN */

 #endif	/* CONFIG_UART_STM32_PORT_2 */


 #ifdef CONFIG_UART_STM32_PORT_3

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_stm32_irq_config_func_3(struct device *dev);
 #endif	/* CONFIG_UART_INTERRUPT_DRIVEN */

 static const struct uart_stm32_config uart_stm32_dev_cfg_3 = {
 	.uconf = {
 		.base = (uint8_t *)USART3_BASE,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 		.irq_config_func = uart_stm32_irq_config_func_3,
 #endif	/* CONFIG_UART_INTERRUPT_DRIVEN */
 	},
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 	.clock_subsys = UINT_TO_POINTER(STM32F10X_CLOCK_SUBSYS_USART3),
 #elif CONFIG_SOC_SERIES_STM32F4X
 	.clock_subsys = UINT_TO_POINTER(STM32F40X_CLOCK_SUBSYS_USART3),
 #elif CONFIG_SOC_SERIES_STM32L4X
 	.clock_subsys = UINT_TO_POINTER(STM32L4X_CLOCK_SUBSYS_USART3),
 #endif	/* CONFIG_SOC_SERIES_STM32F4X */
 };

 static struct uart_stm32_data uart_stm32_dev_data_3 = {
 	.huart = {
 		.Init = {
 			.BaudRate = CONFIG_UART_STM32_PORT_3_BAUD_RATE} }
 };

 DEVICE_AND_API_INIT(uart_stm32_3, CONFIG_UART_STM32_PORT_3_NAME,
 		    &uart_stm32_init,
 		    &uart_stm32_dev_data_3, &uart_stm32_dev_cfg_3,
 		    PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
 		    &uart_stm32_driver_api);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_stm32_irq_config_func_3(struct device *dev)
 {
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 #define PORT_3_IRQ STM32F1_IRQ_USART3
 #elif CONFIG_SOC_SERIES_STM32F4X
 #define PORT_3_IRQ STM32F4_IRQ_USART3
 #elif CONFIG_SOC_SERIES_STM32L4X
 #define PORT_3_IRQ STM32L4_IRQ_USART3
 #endif
 	IRQ_CONNECT(PORT_3_IRQ,
 		CONFIG_UART_STM32_PORT_3_IRQ_PRI,
 		uart_stm32_isr, DEVICE_GET(uart_stm32_3),
 		0);
 	irq_enable(PORT_3_IRQ);
 }
 #endif	/* CONFIG_UART_INTERRUPT_DRIVEN */

 #endif	/* CONFIG_UART_STM32_PORT_3 */
	/*
	* Copyright (c) 2016 Open-RnD Sp. z o.o.
	* Copyright (c) 2016 Linaro Limited.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/**
	* @brief Driver for UART port on STM32F10x family processor.
	*
	* Based on reference manual:
	* STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and STM32F107xx
	* advanced ARM ® -based 32-bit MCUs
	*
	* Chapter 27: Universal synchronous asynchronous receiver
	* transmitter (USART)
	*/

	#include <kernel.h>
	#include <arch/cpu.h>
	#include <misc/__assert.h>
	#include <board.h>
	#include <init.h>
	#include <uart.h>
	#include <clock_control.h>

	#include <sections.h>
	#include <clock_control/stm32_clock_control.h>
	#include "uart_stm32.h"

	/* convenience defines */
	#define DEV_CFG(dev) \
	((const struct uart_stm32_config * const)(dev)->config->config_info)
	#define DEV_DATA(dev) \
	((struct uart_stm32_data * const)(dev)->driver_data)
	#define UART_STRUCT(dev) \
	((USART_TypeDef *)(DEV_CFG(dev))->uconf.base)


	#define TIMEOUT 1000

	static int uart_stm32_poll_in(struct device dev, unsigned char c)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	if (HAL_UART_Receive(UartHandle, (uint8_t *)c, 1, TIMEOUT) == HAL_OK) {
	return 0;
	} else {
	return -1;
	}
	}

	static unsigned char uart_stm32_poll_out(struct device *dev,
	unsigned char c)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	HAL_UART_Transmit(UartHandle, (uint8_t *)&c, 1, TIMEOUT);

	return c;
	}

	static inline void __uart_stm32_get_clock(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	struct device *clk =
	device_get_binding(STM32_CLOCK_CONTROL_NAME);

	__ASSERT_NO_MSG(clk);

	data->clock = clk;
	}

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN

	static int uart_stm32_fifo_fill(struct device dev, const uint8_t tx_data,
	int size)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;
	uint8_t num_tx = 0;

	while ((size - num_tx > 0) && __HAL_UART_GET_FLAG(UartHandle,
	UART_FLAG_TXE)) {
	/* TXE flag will be cleared with byte write to DR register */

	/* Send a character (8bit , parity none) */
	#if defined(CONFIG_SOC_SERIES_STM32F1X) \|\| defined(CONFIG_SOC_SERIES_STM32F4X)
	/* Use direct access for F1, F4 until Low Level API is available
	* Once it is we can remove the if/else
	*/
	UartHandle->Instance->DR = (tx_data[num_tx++] &
	(uint8_t)0x00FF);
	#else
	LL_USART_TransmitData8(UartHandle->Instance, tx_data[num_tx++]);
	#endif
	}

	return num_tx;
	}

	static int uart_stm32_fifo_read(struct device dev, uint8_t rx_data,
	const int size)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;
	uint8_t num_rx = 0;

	while ((size - num_rx > 0) && __HAL_UART_GET_FLAG(UartHandle,
	UART_FLAG_RXNE)) {
	/* Clear the interrupt */
	__HAL_UART_CLEAR_FLAG(UartHandle, UART_FLAG_RXNE);

	/* Receive a character (8bit , parity none) */
	#if defined(CONFIG_SOC_SERIES_STM32F1X) \|\| defined(CONFIG_SOC_SERIES_STM32F4X)
	/* Use direct access for F1, F4 until Low Level API is available
	* Once it is we can remove the if/else
	*/
	rx_data[num_rx++] = (uint8_t)(UartHandle->Instance->DR &
	(uint8_t)0x00FF);
	#else
	rx_data[num_rx++] = LL_USART_ReceiveData8(UartHandle->Instance);
	#endif
	}
	return num_rx;
	}

	static void uart_stm32_irq_tx_enable(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	__HAL_UART_ENABLE_IT(UartHandle, UART_IT_TC);
	}

	static void uart_stm32_irq_tx_disable(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	__HAL_UART_DISABLE_IT(UartHandle, UART_IT_TC);
	}

	static int uart_stm32_irq_tx_ready(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	return __HAL_UART_GET_FLAG(UartHandle, UART_FLAG_TXE);
	}

	static int uart_stm32_irq_tx_empty(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	return __HAL_UART_GET_FLAG(UartHandle, UART_FLAG_TXE);
	}

	static void uart_stm32_irq_rx_enable(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	__HAL_UART_ENABLE_IT(UartHandle, UART_IT_RXNE);
	}

	static void uart_stm32_irq_rx_disable(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	__HAL_UART_DISABLE_IT(UartHandle, UART_IT_RXNE);
	}

	static int uart_stm32_irq_rx_ready(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	return __HAL_UART_GET_FLAG(UartHandle, UART_FLAG_RXNE);
	}

	static void uart_stm32_irq_err_enable(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	/* Enable FE, ORE interruptions */
	__HAL_UART_ENABLE_IT(UartHandle, UART_IT_ERR);
	/* Enable Line break detection */
	__HAL_UART_ENABLE_IT(UartHandle, UART_IT_LBD);
	/* Enable parity error interruption */
	__HAL_UART_ENABLE_IT(UartHandle, UART_IT_PE);
	}

	static void uart_stm32_irq_err_disable(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	/* Disable FE, ORE interruptions */
	__HAL_UART_DISABLE_IT(UartHandle, UART_IT_ERR);
	/* Disable Line break detection */
	__HAL_UART_DISABLE_IT(UartHandle, UART_IT_LBD);
	/* Disable parity error interruption */
	__HAL_UART_DISABLE_IT(UartHandle, UART_IT_PE);
	}

	static int uart_stm32_irq_is_pending(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	return __HAL_UART_GET_FLAG(UartHandle, UART_FLAG_TXE \| UART_FLAG_RXNE);
	}

	static int uart_stm32_irq_update(struct device *dev)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	__HAL_UART_CLEAR_FLAG(UartHandle, UART_FLAG_TC);

	return 1;
	}

	static void uart_stm32_irq_callback_set(struct device *dev,
	uart_irq_callback_t cb)
	{
	struct uart_stm32_data *data = DEV_DATA(dev);

	data->user_cb = cb;
	}

	static void uart_stm32_isr(void *arg)
	{
	struct device *dev = arg;
	struct uart_stm32_data *data = DEV_DATA(dev);

	if (data->user_cb) {
	data->user_cb(dev);
	}
	}

	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	static const struct uart_driver_api uart_stm32_driver_api = {
	.poll_in = uart_stm32_poll_in,
	.poll_out = uart_stm32_poll_out,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.fifo_fill = uart_stm32_fifo_fill,
	.fifo_read = uart_stm32_fifo_read,
	.irq_tx_enable = uart_stm32_irq_tx_enable,
	.irq_tx_disable = uart_stm32_irq_tx_disable,
	.irq_tx_ready = uart_stm32_irq_tx_ready,
	.irq_tx_empty = uart_stm32_irq_tx_empty,
	.irq_rx_enable = uart_stm32_irq_rx_enable,
	.irq_rx_disable = uart_stm32_irq_rx_disable,
	.irq_rx_ready = uart_stm32_irq_rx_ready,
	.irq_err_enable = uart_stm32_irq_err_enable,
	.irq_err_disable = uart_stm32_irq_err_disable,
	.irq_is_pending = uart_stm32_irq_is_pending,
	.irq_update = uart_stm32_irq_update,
	.irq_callback_set = uart_stm32_irq_callback_set,
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
	};

	/**
	* @brief Initialize UART channel
	*
	* This routine is called to reset the chip in a quiescent state.
	* It is assumed that this function is called only once per UART.
	*
	* @param dev UART device struct
	*
	* @return 0
	*/
	static int uart_stm32_init(struct device *dev)
	{
	const struct uart_stm32_config *config = DEV_CFG(dev);
	struct uart_stm32_data *data = DEV_DATA(dev);
	UART_HandleTypeDef *UartHandle = &data->huart;

	__uart_stm32_get_clock(dev);
	/* enable clock */
	#if defined(CONFIG_SOC_SERIES_STM32F1X) \|\| defined(CONFIG_SOC_SERIES_STM32L4X)
	clock_control_on(data->clock, config->clock_subsys);
	#elif defined(CONFIG_SOC_SERIES_STM32F4X)
	clock_control_on(data->clock,
	(clock_control_subsys_t *)&config->pclken);
	#endif

	UartHandle->Instance = UART_STRUCT(dev);
	UartHandle->Init.WordLength = UART_WORDLENGTH_8B;
	UartHandle->Init.StopBits = UART_STOPBITS_1;
	UartHandle->Init.Parity = UART_PARITY_NONE;
	UartHandle->Init.HwFlowCtl = UART_HWCONTROL_NONE;
	UartHandle->Init.Mode = UART_MODE_TX_RX;
	UartHandle->Init.OverSampling = UART_OVERSAMPLING_16;

	HAL_UART_Init(UartHandle);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	config->uconf.irq_config_func(dev);
	#endif
	return 0;
	}


	#ifdef CONFIG_UART_STM32_PORT_1

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_stm32_irq_config_func_1(struct device *dev);
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	static const struct uart_stm32_config uart_stm32_dev_cfg_1 = {
	.uconf = {
	.base = (uint8_t *)USART1_BASE,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.irq_config_func = uart_stm32_irq_config_func_1,
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
	},
	#ifdef CONFIG_SOC_SERIES_STM32F1X
	.clock_subsys = UINT_TO_POINTER(STM32F10X_CLOCK_SUBSYS_USART1),
	#elif CONFIG_SOC_SERIES_STM32F4X
	.pclken = { .bus = STM32F4X_CLOCK_BUS_APB2,
	.enr = STM32F4X_CLOCK_ENABLE_USART1 },
	#elif CONFIG_SOC_SERIES_STM32L4X
	.clock_subsys = UINT_TO_POINTER(STM32L4X_CLOCK_SUBSYS_USART1),
	#endif /* CONFIG_SOC_SERIES_STM32FX */
	};

	static struct uart_stm32_data uart_stm32_dev_data_1 = {
	.huart = {
	.Init = {
	.BaudRate = CONFIG_UART_STM32_PORT_1_BAUD_RATE} }
	};

	DEVICE_AND_API_INIT(uart_stm32_1, CONFIG_UART_STM32_PORT_1_NAME,
	&uart_stm32_init,
	&uart_stm32_dev_data_1, &uart_stm32_dev_cfg_1,
	PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
	&uart_stm32_driver_api);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_stm32_irq_config_func_1(struct device *dev)
	{
	#ifdef CONFIG_SOC_SERIES_STM32F1X
	#define PORT_1_IRQ STM32F1_IRQ_USART1
	#elif CONFIG_SOC_SERIES_STM32F4X
	#define PORT_1_IRQ STM32F4_IRQ_USART1
	#elif CONFIG_SOC_SERIES_STM32L4X
	#define PORT_1_IRQ STM32L4_IRQ_USART1
	#endif
	IRQ_CONNECT(PORT_1_IRQ,
	CONFIG_UART_STM32_PORT_1_IRQ_PRI,
	uart_stm32_isr, DEVICE_GET(uart_stm32_1),
	0);
	irq_enable(PORT_1_IRQ);
	}
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	#endif /* CONFIG_UART_STM32_PORT_1 */


	#ifdef CONFIG_UART_STM32_PORT_2

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_stm32_irq_config_func_2(struct device *dev);
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	static const struct uart_stm32_config uart_stm32_dev_cfg_2 = {
	.uconf = {
	.base = (uint8_t *)USART2_BASE,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.irq_config_func = uart_stm32_irq_config_func_2,
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
	},
	#ifdef CONFIG_SOC_SERIES_STM32F1X
	.clock_subsys = UINT_TO_POINTER(STM32F10X_CLOCK_SUBSYS_USART2),
	#elif CONFIG_SOC_SERIES_STM32F4X
	.pclken = { .bus = STM32F4X_CLOCK_BUS_APB1,
	.enr = STM32F4X_CLOCK_ENABLE_USART2 },
	#elif CONFIG_SOC_SERIES_STM32L4X
	.clock_subsys = UINT_TO_POINTER(STM32L4X_CLOCK_SUBSYS_USART2),
	#endif /* CONFIG_SOC_SERIES_STM32FX */
	};

	static struct uart_stm32_data uart_stm32_dev_data_2 = {
	.huart = {
	.Init = {
	.BaudRate = CONFIG_UART_STM32_PORT_2_BAUD_RATE} }
	};

	DEVICE_AND_API_INIT(uart_stm32_2, CONFIG_UART_STM32_PORT_2_NAME,
	&uart_stm32_init,
	&uart_stm32_dev_data_2, &uart_stm32_dev_cfg_2,
	PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
	&uart_stm32_driver_api);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_stm32_irq_config_func_2(struct device *dev)
	{
	#ifdef CONFIG_SOC_SERIES_STM32F1X
	#define PORT_2_IRQ STM32F1_IRQ_USART2
	#elif CONFIG_SOC_SERIES_STM32F4X
	#define PORT_2_IRQ STM32F4_IRQ_USART2
	#elif CONFIG_SOC_SERIES_STM32L4X
	#define PORT_2_IRQ STM32L4_IRQ_USART2
	#endif
	IRQ_CONNECT(PORT_2_IRQ,
	CONFIG_UART_STM32_PORT_2_IRQ_PRI,
	uart_stm32_isr, DEVICE_GET(uart_stm32_2),
	0);
	irq_enable(PORT_2_IRQ);
	}
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	#endif /* CONFIG_UART_STM32_PORT_2 */


	#ifdef CONFIG_UART_STM32_PORT_3

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_stm32_irq_config_func_3(struct device *dev);
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	static const struct uart_stm32_config uart_stm32_dev_cfg_3 = {
	.uconf = {
	.base = (uint8_t *)USART3_BASE,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.irq_config_func = uart_stm32_irq_config_func_3,
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
	},
	#ifdef CONFIG_SOC_SERIES_STM32F1X
	.clock_subsys = UINT_TO_POINTER(STM32F10X_CLOCK_SUBSYS_USART3),
	#elif CONFIG_SOC_SERIES_STM32F4X
	.clock_subsys = UINT_TO_POINTER(STM32F40X_CLOCK_SUBSYS_USART3),
	#elif CONFIG_SOC_SERIES_STM32L4X
	.clock_subsys = UINT_TO_POINTER(STM32L4X_CLOCK_SUBSYS_USART3),
	#endif /* CONFIG_SOC_SERIES_STM32F4X */
	};

	static struct uart_stm32_data uart_stm32_dev_data_3 = {
	.huart = {
	.Init = {
	.BaudRate = CONFIG_UART_STM32_PORT_3_BAUD_RATE} }
	};

	DEVICE_AND_API_INIT(uart_stm32_3, CONFIG_UART_STM32_PORT_3_NAME,
	&uart_stm32_init,
	&uart_stm32_dev_data_3, &uart_stm32_dev_cfg_3,
	PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
	&uart_stm32_driver_api);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_stm32_irq_config_func_3(struct device *dev)
	{
	#ifdef CONFIG_SOC_SERIES_STM32F1X
	#define PORT_3_IRQ STM32F1_IRQ_USART3
	#elif CONFIG_SOC_SERIES_STM32F4X
	#define PORT_3_IRQ STM32F4_IRQ_USART3
	#elif CONFIG_SOC_SERIES_STM32L4X
	#define PORT_3_IRQ STM32L4_IRQ_USART3
	#endif
	IRQ_CONNECT(PORT_3_IRQ,
	CONFIG_UART_STM32_PORT_3_IRQ_PRI,
	uart_stm32_isr, DEVICE_GET(uart_stm32_3),
	0);
	irq_enable(PORT_3_IRQ);
	}
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	#endif /* CONFIG_UART_STM32_PORT_3 */