Question
STM32 F103xx HAL UART echo
Posted on August 29, 2017 at 18:15
I am trying to implement a simple echo program using the HAL drivers. Here is my code
#include 'stm32f1xx.h'
#include 'stm32f1xx_hal.h'
#include 'stm32f1xx_hal_conf.h'
void Error_Handler(void);
void SystemClock_Config(void);
void Startup_Sequence(void);
UART_HandleTypeDef UartHandle;
__IO ITStatus UartReady = RESET;
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *UartHandle) {
UartReady = SET;
}
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle) {
UartReady = SET;
}
void USART1_IRQHandler(void) {
HAL_UART_IRQHandler(&UartHandle);
}
int main(void) {
HAL_Init();
SystemInit();
SystemClock_Config();
GPIO_InitTypeDef GPIO_InitStruct;
// Enable GPIO and USART1 clocks.
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_USART1_CLK_ENABLE();
// Setup LED pin
GPIO_InitStruct.Pin = GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
// Setup UART TX Pin
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
//Setup UART RX Pin
GPIO_InitStruct.Pin = GPIO_PIN_10;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
HAL_Delay(1000);
//Setup UART Instance
UartHandle.Instance = USART1;
UartHandle.Init.BaudRate = 9600;
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;
//Error handling
if(HAL_UART_DeInit(&UartHandle) != HAL_OK) {
Error_Handler();
}
if(HAL_UART_Init(&UartHandle) != HAL_OK) {
Error_Handler();
}
HAL_NVIC_SetPriority(USART1_IRQn, 0, 1);
HAL_NVIC_EnableIRQ(USART1_IRQn);
uint8_t msg[] = '';
Startup_Sequence();
while(1) {
if(HAL_UART_Transmit_IT(&UartHandle, &msg, sizeof(msg))!= HAL_OK) {
Error_Handler();
}
while (UartReady != SET){}
UartReady = RESET;
if(HAL_UART_Receive_IT(&UartHandle, &msg, sizeof(msg)) != HAL_OK) {
Error_Handler();
}
while (UartReady != SET){}
UartReady = RESET;
}
}
/**
* Blinks external LED (PIN B15) if error encountered.
*/
void Error_Handler(void) {
while(1) {
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_15);
HAL_Delay(1000);
}
}
void Startup_Sequence(void) {
int i;
for(i=1;i<10; i++) {
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_15);
HAL_Delay(1000 * (1.0/i));
}
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_15, GPIO_PIN_RESET);
}
void SystemClock_Config(void) {
RCC_ClkInitTypeDef clkinitstruct = {0};
RCC_OscInitTypeDef oscinitstruct = {0};
oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
oscinitstruct.HSEState = RCC_HSE_ON;
oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
oscinitstruct.PLL.PLLState = RCC_PLL_ON;
oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK) {
while(1);
}
clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK) {
while(1);
}
}
�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?I am having problems with this however. Characters are being lost, I think because of an overrun. Below is an image of transmitted data vs received.
http://i.imgur.com/GTupBhK.png
So what must I change in my code to prevent an overrun?
Many thanks.
#stm32f1-uart #stm32