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mbed-os/hal/targets/hal/TARGET_STM/TARGET_STM32L0/serial_api.c

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/* mbed Microcontroller Library
*******************************************************************************
* Copyright (c) 2015, STMicroelectronics
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*******************************************************************************
*/
#include "mbed_assert.h"
#include "serial_api.h"
#if DEVICE_SERIAL
#include "cmsis.h"
#include "pinmap.h"
#include <string.h>
#include "PeripheralPins.h"
#include "mbed_error.h"
#define UART_NUM (5)
static uint32_t serial_irq_ids[UART_NUM] = {0};
static UART_HandleTypeDef uart_handlers[UART_NUM];
static uart_irq_handler irq_handler;
int stdio_uart_inited = 0;
serial_t stdio_uart;
#if DEVICE_SERIAL_ASYNCH
#define SERIAL_S(obj) (&((obj)->serial))
#else
#define SERIAL_S(obj) (obj)
#endif
static void init_uart(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
huart->Instance = (USART_TypeDef *)(obj_s->uart);
huart->Init.BaudRate = obj_s->baudrate;
huart->Init.WordLength = obj_s->databits;
huart->Init.StopBits = obj_s->stopbits;
huart->Init.Parity = obj_s->parity;
huart->Init.Parity = obj_s->parity;
#if DEVICE_SERIAL_FC
huart->Init.HwFlowCtl = obj_s->hw_flow_ctl;
#else
huart->Init.HwFlowCtl = UART_HWCONTROL_NONE;
#endif
huart->TxXferCount = 0;
huart->TxXferSize = 0;
huart->RxXferCount = 0;
huart->RxXferSize = 0;
if (obj_s->pin_rx == NC) {
huart->Init.Mode = UART_MODE_TX;
} else if (obj_s->pin_tx == NC) {
huart->Init.Mode = UART_MODE_RX;
} else {
huart->Init.Mode = UART_MODE_TX_RX;
}
if (HAL_UART_Init(huart) != HAL_OK) {
error("Cannot initialize UART\n");
}
}
void serial_init(serial_t *obj, PinName tx, PinName rx)
{
struct serial_s *obj_s = SERIAL_S(obj);
// Determine the UART to use (UART_1, UART_2, ...)
UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
// Get the peripheral name (UART_1, UART_2, ...) from the pin and assign it to the object
obj_s->uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
MBED_ASSERT(obj_s->uart != (UARTName)NC);
// Enable UART clock
#if defined(USART1_BASE)
if (obj_s->uart == UART_1) {
__HAL_RCC_USART1_FORCE_RESET();
__HAL_RCC_USART1_RELEASE_RESET();
__HAL_RCC_USART1_CLK_ENABLE();
obj_s->index = 0;
}
#endif
if (obj_s->uart == UART_2) {
__HAL_RCC_USART2_FORCE_RESET();
__HAL_RCC_USART2_RELEASE_RESET();
__HAL_RCC_USART2_CLK_ENABLE();
obj_s->index = 1;
}
if (obj_s->uart == LPUART_1) {
__HAL_RCC_LPUART1_FORCE_RESET();
__HAL_RCC_LPUART1_RELEASE_RESET();
__HAL_RCC_LPUART1_CLK_ENABLE();
obj_s->index = 2;
}
#if defined(USART4_BASE)
if (obj_s->uart == UART_4) {
__HAL_RCC_USART4_FORCE_RESET();
__HAL_RCC_USART4_RELEASE_RESET();
__HAL_RCC_USART4_CLK_ENABLE();
obj_s->index = 3;
}
#endif
#if defined(USART5_BASE)
if (obj_s->uart == UART_5) {
__HAL_RCC_USART5_FORCE_RESET();
__HAL_RCC_USART5_RELEASE_RESET();
__HAL_RCC_USART5_CLK_ENABLE();
obj_s->index = 4;
}
#endif
// Configure the UART pins
pinmap_pinout(tx, PinMap_UART_TX);
pinmap_pinout(rx, PinMap_UART_RX);
if (tx != NC) {
pin_mode(tx, PullUp);
}
if (rx != NC) {
pin_mode(rx, PullUp);
}
// Configure UART
obj_s->baudrate = 9600;
obj_s->databits = UART_WORDLENGTH_8B;
obj_s->stopbits = UART_STOPBITS_1;
obj_s->parity = UART_PARITY_NONE;
#if DEVICE_SERIAL_FC
obj_s->hw_flow_ctl = UART_HWCONTROL_NONE;
#endif
obj_s->pin_tx = tx;
obj_s->pin_rx = rx;
init_uart(obj);
// For stdio management
if (obj_s->uart == STDIO_UART) {
stdio_uart_inited = 1;
memcpy(&stdio_uart, obj, sizeof(serial_t));
}
}
void serial_free(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
// Reset UART and disable clock
#if defined(USART1_BASE)
if (obj_s->uart == UART_1) {
__HAL_RCC_USART1_FORCE_RESET();
__HAL_RCC_USART1_RELEASE_RESET();
__HAL_RCC_USART1_CLK_DISABLE();
}
#endif
if (obj_s->uart == UART_2) {
__HAL_RCC_USART2_FORCE_RESET();
__HAL_RCC_USART2_RELEASE_RESET();
__HAL_RCC_USART2_CLK_DISABLE();
}
if (obj_s->uart == LPUART_1) {
__HAL_RCC_LPUART1_FORCE_RESET();
__HAL_RCC_LPUART1_RELEASE_RESET();
__HAL_RCC_LPUART1_CLK_DISABLE();
}
#if defined(USART4_BASE)
if (obj_s->uart == UART_4) {
__HAL_RCC_USART4_FORCE_RESET();
__HAL_RCC_USART4_RELEASE_RESET();
__HAL_RCC_USART4_CLK_DISABLE();
}
#endif
#if defined(USART5_BASE)
if (obj_s->uart == UART_5) {
__HAL_RCC_USART5_FORCE_RESET();
__HAL_RCC_USART5_RELEASE_RESET();
__HAL_RCC_USART5_CLK_DISABLE();
}
#endif
// Configure GPIOs
pin_function(obj_s->pin_tx, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
pin_function(obj_s->pin_rx, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
serial_irq_ids[obj_s->index] = 0;
}
void serial_baud(serial_t *obj, int baudrate)
{
struct serial_s *obj_s = SERIAL_S(obj);
obj_s->baudrate = baudrate;
init_uart(obj);
}
void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits)
{
struct serial_s *obj_s = SERIAL_S(obj);
if (data_bits == 9) {
obj_s->databits = UART_WORDLENGTH_9B;
} else {
obj_s->databits = UART_WORDLENGTH_8B;
}
switch (parity) {
case ParityOdd:
obj_s->parity = UART_PARITY_ODD;
break;
case ParityEven:
obj_s->parity = UART_PARITY_EVEN;
break;
default: // ParityNone
case ParityForced0: // unsupported!
case ParityForced1: // unsupported!
obj_s->parity = UART_PARITY_NONE;
break;
}
if (stop_bits == 2) {
obj_s->stopbits = UART_STOPBITS_2;
} else {
obj_s->stopbits = UART_STOPBITS_1;
}
init_uart(obj);
}
/******************************************************************************
* INTERRUPTS HANDLING
******************************************************************************/
static void uart_irq(int id)
{
UART_HandleTypeDef * huart = &uart_handlers[id];
if (serial_irq_ids[id] != 0) {
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_TC) != RESET) {
if (__HAL_UART_GET_IT_SOURCE(huart, UART_IT_TC) != RESET) {
irq_handler(serial_irq_ids[id], TxIrq);
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_TCF);
}
}
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_RXNE) != RESET) {
if (__HAL_UART_GET_IT_SOURCE(huart, UART_IT_RXNE) != RESET) {
irq_handler(serial_irq_ids[id], RxIrq);
volatile uint32_t tmpval = huart->Instance->RDR; // Clear RXNE flag
}
}
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_ORE) != RESET) {
if (__HAL_UART_GET_IT_SOURCE(huart, UART_IT_ORE) != RESET) {
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_OREF);
}
}
}
}
#if defined(USART1_BASE)
static void uart1_irq(void)
{
uart_irq(0);
}
#endif
static void uart2_irq(void)
{
uart_irq(1);
}
static void lpuart1_irq(void)
{
uart_irq(2);
}
#if defined(USART4_BASE)
static void uart4_irq(void)
{
uart_irq(3);
}
#endif
#if defined(USART5_BASE)
static void uart5_irq(void)
{
uart_irq(4);
}
#endif
void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id)
{
struct serial_s *obj_s = SERIAL_S(obj);
irq_handler = handler;
serial_irq_ids[obj_s->index] = id;
}
void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
IRQn_Type irq_n = (IRQn_Type)0;
uint32_t vector = 0;
#if defined(USART1_BASE)
if (obj_s->uart == UART_1) {
irq_n = USART1_IRQn;
vector = (uint32_t)&uart1_irq;
}
#endif
if (obj_s->uart == UART_2) {
irq_n = USART2_IRQn;
vector = (uint32_t)&uart2_irq;
}
if (obj_s->uart == LPUART_1) {
irq_n = RNG_LPUART1_IRQn;
vector = (uint32_t)&lpuart1_irq;
}
#if defined(USART4_BASE)
if (obj_s->uart == UART_4) {
irq_n = USART4_5_IRQn;
vector = (uint32_t)&uart4_irq;
}
#endif
#if defined(USART5_BASE)
if (obj_s->uart == UART_5) {
irq_n = USART4_5_IRQn;
vector = (uint32_t)&uart5_irq;
}
#endif
if (enable) {
if (irq == RxIrq) {
__HAL_UART_ENABLE_IT(huart, UART_IT_RXNE);
} else { // TxIrq
__HAL_UART_ENABLE_IT(huart, UART_IT_TC);
}
NVIC_SetVector(irq_n, vector);
NVIC_EnableIRQ(irq_n);
} else { // disable
int all_disabled = 0;
if (irq == RxIrq) {
__HAL_UART_DISABLE_IT(huart, UART_IT_RXNE);
// Check if TxIrq is disabled too
if ((huart->Instance->CR1 & USART_CR1_TXEIE) == 0) {
all_disabled = 1;
}
} else { // TxIrq
__HAL_UART_DISABLE_IT(huart, UART_IT_TC);
// Check if RxIrq is disabled too
if ((huart->Instance->CR1 & USART_CR1_RXNEIE) == 0) {
all_disabled = 1;
}
}
if (all_disabled) {
NVIC_DisableIRQ(irq_n);
}
}
}
/******************************************************************************
* READ/WRITE
******************************************************************************/
int serial_getc(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
while (!serial_readable(obj));
return (int)(huart->Instance->RDR & (uint16_t)0xFF);
}
void serial_putc(serial_t *obj, int c)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
while (!serial_writable(obj));
huart->Instance->TDR = (uint32_t)(c & (uint16_t)0xFF);
}
int serial_readable(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
// Check if data is received
return (__HAL_UART_GET_FLAG(huart, UART_FLAG_RXNE) != RESET) ? 1 : 0;
}
int serial_writable(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
// Check if data is transmitted
return (__HAL_UART_GET_FLAG(huart, UART_FLAG_TXE) != RESET) ? 1 : 0;
}
void serial_clear(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
huart->TxXferCount = 0;
huart->RxXferCount = 0;
}
void serial_pinout_tx(PinName tx)
{
pinmap_pinout(tx, PinMap_UART_TX);
}
void serial_break_set(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
__HAL_UART_SEND_REQ(huart, UART_SENDBREAK_REQUEST);
}
void serial_break_clear(serial_t *obj)
{
(void)obj;
}
#if DEVICE_SERIAL_ASYNCH
/******************************************************************************
* LOCAL HELPER FUNCTIONS
******************************************************************************/
/**
* Configure the TX buffer for an asynchronous write serial transaction
*
* @param obj The serial object.
* @param tx The buffer for sending.
* @param tx_length The number of words to transmit.
*/
static void serial_tx_buffer_set(serial_t *obj, void *tx, int tx_length, uint8_t width)
{
(void)width;
// Exit if a transmit is already on-going
if (serial_tx_active(obj)) {
return;
}
obj->tx_buff.buffer = tx;
obj->tx_buff.length = tx_length;
obj->tx_buff.pos = 0;
}
/**
* Configure the RX buffer for an asynchronous write serial transaction
*
* @param obj The serial object.
* @param tx The buffer for sending.
* @param tx_length The number of words to transmit.
*/
static void serial_rx_buffer_set(serial_t *obj, void *rx, int rx_length, uint8_t width)
{
(void)width;
// Exit if a reception is already on-going
if (serial_rx_active(obj)) {
return;
}
obj->rx_buff.buffer = rx;
obj->rx_buff.length = rx_length;
obj->rx_buff.pos = 0;
}
/**
* Configure events
*
* @param obj The serial object
* @param event The logical OR of the events to configure
* @param enable Set to non-zero to enable events, or zero to disable them
*/
static void serial_enable_event(serial_t *obj, int event, uint8_t enable)
{
struct serial_s *obj_s = SERIAL_S(obj);
// Shouldn't have to enable interrupt here, just need to keep track of the requested events.
if (enable) {
obj_s->events |= event;
} else {
obj_s->events &= ~event;
}
}
/**
* Get index of serial object TX IRQ, relating it to the physical peripheral.
*
* @param obj pointer to serial object
* @return internal NVIC TX IRQ index of U(S)ART peripheral
*/
static IRQn_Type serial_get_irq_n(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
IRQn_Type irq_n;
switch (obj_s->index) {
#if defined(USART1_BASE)
case 0:
irq_n = USART1_IRQn;
break;
#endif
case 1:
irq_n = USART2_IRQn;
break;
case 2:
irq_n = RNG_LPUART1_IRQn;
break;
#if defined(USART4_BASE)
case 3:
irq_n = USART4_5_IRQn;
break;
#endif
#if defined(USART5_BASE)
case 4:
irq_n = USART4_5_IRQn;
break;
#endif
default:
irq_n = (IRQn_Type)0;
}
return irq_n;
}
/******************************************************************************
* MBED API FUNCTIONS
******************************************************************************/
/**
* Begin asynchronous TX transfer. The used buffer is specified in the serial
* object, tx_buff
*
* @param obj The serial object
* @param tx The buffer for sending
* @param tx_length The number of words to transmit
* @param tx_width The bit width of buffer word
* @param handler The serial handler
* @param event The logical OR of events to be registered
* @param hint A suggestion for how to use DMA with this transfer
* @return Returns number of data transfered, or 0 otherwise
*/
int serial_tx_asynch(serial_t *obj, const void *tx, size_t tx_length, uint8_t tx_width, uint32_t handler, uint32_t event, DMAUsage hint)
{
// TODO: DMA usage is currently ignored
(void) hint;
// Check buffer is ok
MBED_ASSERT(tx != (void*)0);
MBED_ASSERT(tx_width == 8); // support only 8b width
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef * huart = &uart_handlers[obj_s->index];
if (tx_length == 0) {
return 0;
}
// Set up buffer
serial_tx_buffer_set(obj, (void *)tx, tx_length, tx_width);
// Set up events
serial_enable_event(obj, SERIAL_EVENT_TX_ALL, 0); // Clear all events
serial_enable_event(obj, event, 1); // Set only the wanted events
// Enable interrupt
IRQn_Type irq_n = serial_get_irq_n(obj);
NVIC_ClearPendingIRQ(irq_n);
NVIC_DisableIRQ(irq_n);
NVIC_SetPriority(irq_n, 1);
NVIC_SetVector(irq_n, (uint32_t)handler);
NVIC_EnableIRQ(irq_n);
// the following function will enable UART_IT_TXE and error interrupts
if (HAL_UART_Transmit_IT(huart, (uint8_t*)tx, tx_length) != HAL_OK) {
return 0;
}
return tx_length;
}
/**
* Begin asynchronous RX transfer (enable interrupt for data collecting)
* The used buffer is specified in the serial object, rx_buff
*
* @param obj The serial object
* @param rx The buffer for sending
* @param rx_length The number of words to transmit
* @param rx_width The bit width of buffer word
* @param handler The serial handler
* @param event The logical OR of events to be registered
* @param handler The serial handler
* @param char_match A character in range 0-254 to be matched
* @param hint A suggestion for how to use DMA with this transfer
*/
void serial_rx_asynch(serial_t *obj, void *rx, size_t rx_length, uint8_t rx_width, uint32_t handler, uint32_t event, uint8_t char_match, DMAUsage hint)
{
// TODO: DMA usage is currently ignored
(void) hint;
/* Sanity check arguments */
MBED_ASSERT(obj);
MBED_ASSERT(rx != (void*)0);
MBED_ASSERT(rx_width == 8); // support only 8b width
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
serial_enable_event(obj, SERIAL_EVENT_RX_ALL, 0);
serial_enable_event(obj, event, 1);
// set CharMatch
obj->char_match = char_match;
serial_rx_buffer_set(obj, rx, rx_length, rx_width);
IRQn_Type irq_n = serial_get_irq_n(obj);
NVIC_ClearPendingIRQ(irq_n);
NVIC_DisableIRQ(irq_n);
NVIC_SetPriority(irq_n, 0);
NVIC_SetVector(irq_n, (uint32_t)handler);
NVIC_EnableIRQ(irq_n);
// following HAL function will enable the RXNE interrupt + error interrupts
HAL_UART_Receive_IT(huart, (uint8_t*)rx, rx_length);
}
/**
* Attempts to determine if the serial peripheral is already in use for TX
*
* @param obj The serial object
* @return Non-zero if the TX transaction is ongoing, 0 otherwise
*/
uint8_t serial_tx_active(serial_t *obj)
{
MBED_ASSERT(obj);
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
return ((HAL_UART_GetState(huart) == HAL_UART_STATE_BUSY_TX) ? 1 : 0);
}
/**
* Attempts to determine if the serial peripheral is already in use for RX
*
* @param obj The serial object
* @return Non-zero if the RX transaction is ongoing, 0 otherwise
*/
uint8_t serial_rx_active(serial_t *obj)
{
MBED_ASSERT(obj);
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
return ((HAL_UART_GetState(huart) == HAL_UART_STATE_BUSY_RX) ? 1 : 0);
}
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart) {
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_TC) != RESET) {
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_TCF);
}
}
/**
* The asynchronous TX and RX handler.
*
* @param obj The serial object
* @return Returns event flags if a TX/RX transfer termination condition was met or 0 otherwise
*/
int serial_irq_handler_asynch(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
volatile int return_event = 0;
uint8_t *buf = (uint8_t*)(obj->rx_buff.buffer);
uint8_t i = 0;
// TX PART:
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_TC) != RESET) {
if (__HAL_UART_GET_IT_SOURCE(huart, UART_IT_TC) != RESET) {
// Return event SERIAL_EVENT_TX_COMPLETE if requested
if ((obj_s->events & SERIAL_EVENT_TX_COMPLETE ) != 0) {
return_event |= (SERIAL_EVENT_TX_COMPLETE & obj_s->events);
}
}
}
// Handle error events
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_PE) != RESET) {
if (__HAL_UART_GET_IT_SOURCE(huart, USART_IT_ERR) != RESET) {
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_PEF);
return_event |= (SERIAL_EVENT_RX_PARITY_ERROR & obj_s->events);
}
}
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_FE) != RESET) {
if (__HAL_UART_GET_IT_SOURCE(huart, USART_IT_ERR) != RESET) {
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_FEF);
return_event |= (SERIAL_EVENT_RX_FRAMING_ERROR & obj_s->events);
}
}
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_NE) != RESET) {
if (__HAL_UART_GET_IT_SOURCE(huart, USART_IT_ERR) != RESET) {
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_NEF);
}
}
if (__HAL_UART_GET_FLAG(huart, UART_FLAG_ORE) != RESET) {
if (__HAL_UART_GET_IT_SOURCE(huart, USART_IT_ERR) != RESET) {
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_OREF);
return_event |= (SERIAL_EVENT_RX_OVERRUN_ERROR & obj_s->events);
}
}
HAL_UART_IRQHandler(huart);
// Abort if an error occurs
if (return_event & SERIAL_EVENT_RX_PARITY_ERROR ||
return_event & SERIAL_EVENT_RX_FRAMING_ERROR ||
return_event & SERIAL_EVENT_RX_OVERRUN_ERROR) {
return return_event;
}
//RX PART
if (huart->RxXferSize != 0) {
obj->rx_buff.pos = huart->RxXferSize - huart->RxXferCount;
}
if ((huart->RxXferCount == 0) && (obj->rx_buff.pos >= (obj->rx_buff.length - 1))) {
return_event |= (SERIAL_EVENT_RX_COMPLETE & obj_s->events);
}
// Check if char_match is present
if (obj_s->events & SERIAL_EVENT_RX_CHARACTER_MATCH) {
if (buf != NULL) {
for (i = 0; i < obj->rx_buff.pos; i++) {
if (buf[i] == obj->char_match) {
obj->rx_buff.pos = i;
return_event |= (SERIAL_EVENT_RX_CHARACTER_MATCH & obj_s->events);
serial_rx_abort_asynch(obj);
break;
}
}
}
}
return return_event;
}
/**
* Abort the ongoing TX transaction. It disables the enabled interupt for TX and
* flush TX hardware buffer if TX FIFO is used
*
* @param obj The serial object
*/
void serial_tx_abort_asynch(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
__HAL_UART_DISABLE_IT(huart, UART_IT_TC);
__HAL_UART_DISABLE_IT(huart, UART_IT_TXE);
// clear flags
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_TCF);
// reset states
huart->TxXferCount = 0;
// update handle state
if(huart->State == HAL_UART_STATE_BUSY_TX_RX) {
huart->State = HAL_UART_STATE_BUSY_RX;
} else {
huart->State = HAL_UART_STATE_READY;
}
}
/**
* Abort the ongoing RX transaction It disables the enabled interrupt for RX and
* flush RX hardware buffer if RX FIFO is used
*
* @param obj The serial object
*/
void serial_rx_abort_asynch(serial_t *obj)
{
struct serial_s *obj_s = SERIAL_S(obj);
UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
// disable interrupts
__HAL_UART_DISABLE_IT(huart, UART_IT_RXNE);
__HAL_UART_DISABLE_IT(huart, UART_IT_PE);
__HAL_UART_DISABLE_IT(huart, UART_IT_ERR);
// clear flags
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_PEF | UART_CLEAR_FEF | UART_CLEAR_OREF);
volatile uint32_t tmpval = huart->Instance->RDR; // Clear RXNE flag
// reset states
huart->RxXferCount = 0;
// update handle state
if(huart->State == HAL_UART_STATE_BUSY_TX_RX) {
huart->State = HAL_UART_STATE_BUSY_TX;
} else {
huart->State = HAL_UART_STATE_READY;
}
}
#endif
#if DEVICE_SERIAL_FC
/**
* Set HW Control Flow
* @param obj The serial object
* @param type The Control Flow type (FlowControlNone, FlowControlRTS, FlowControlCTS, FlowControlRTSCTS)
* @param rxflow Pin for the rxflow
* @param txflow Pin for the txflow
*/
void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow)
{
struct serial_s *obj_s = SERIAL_S(obj);
// Determine the UART to use (UART_1, UART_2, ...)
UARTName uart_rts = (UARTName)pinmap_peripheral(rxflow, PinMap_UART_RTS);
UARTName uart_cts = (UARTName)pinmap_peripheral(txflow, PinMap_UART_CTS);
// Get the peripheral name (UART_1, UART_2, ...) from the pin and assign it to the object
obj_s->uart = (UARTName)pinmap_merge(uart_cts, uart_rts);
MBED_ASSERT(obj_s->uart != (UARTName)NC);
if(type == FlowControlNone) {
// Disable hardware flow control
obj_s->hw_flow_ctl = UART_HWCONTROL_NONE;
}
if (type == FlowControlRTS) {
// Enable RTS
MBED_ASSERT(uart_rts != (UARTName)NC);
obj_s->hw_flow_ctl = UART_HWCONTROL_RTS;
obj_s->pin_rts = rxflow;
// Enable the pin for RTS function
pinmap_pinout(rxflow, PinMap_UART_RTS);
}
if (type == FlowControlCTS) {
// Enable CTS
MBED_ASSERT(uart_cts != (UARTName)NC);
obj_s->hw_flow_ctl = UART_HWCONTROL_CTS;
obj_s->pin_cts = txflow;
// Enable the pin for CTS function
pinmap_pinout(txflow, PinMap_UART_CTS);
}
if (type == FlowControlRTSCTS) {
// Enable CTS & RTS
MBED_ASSERT(uart_rts != (UARTName)NC);
MBED_ASSERT(uart_cts != (UARTName)NC);
obj_s->hw_flow_ctl = UART_HWCONTROL_RTS_CTS;
obj_s->pin_rts = rxflow;
obj_s->pin_cts = txflow;
// Enable the pin for CTS function
pinmap_pinout(txflow, PinMap_UART_CTS);
// Enable the pin for RTS function
pinmap_pinout(rxflow, PinMap_UART_RTS);
}
init_uart(obj);
}
#endif
#endif
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