/* ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ This code transmit a message using the UART peripheral. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */ /* **************** START *********************** */ /* Libraries, Definitions and Global Declarations */ #include #include #include "main.h" #include "user_uart.h" #include "STM32FreeRTOSConfig.h" #include "STM32FreeRTOS.h" #include "task.h" #include "queue.h" TaskHandle_t StartDefaultTaskHandle; TaskHandle_t ReceiverHandle, Sender1Handle; QueueHandle_t Queue1Handle; void USER_RCC_Init( void ); void StartDefaultTask( void *pvParameters ); void StartReceiver( void *pvParameters ); void StartSender1( void *pvParameters ); /* Superloop structure */ int main(void) { /* Declarations and Initializations */ USER_RCC_Init( ); USER_UART2_Init( ); // Create a task with a priority of 0 (idle), 1 (belowNormal), 2 (Normal), 3 (High), 4 (VeryHigh) xTaskCreate(StartDefaultTask, "IdleTask", 128, NULL, 0, &StartDefaultTaskHandle); xTaskCreate(StartReceiver, "Receiver", 128, NULL, 2, &ReceiverHandle); xTaskCreate(StartSender1, "Sender1", 128, NULL, 2, &Sender1Handle); Queue1Handle = xQueueCreate( 1, sizeof(uint32_t) ); // Start the scheduler printf("Initializing Scheduler...\r\n"); vTaskStartScheduler(); /* Repetitive block */ for(;;){ } } // IdleTask function void StartDefaultTask(void *pvParameters) { for(;;) { } } // Reciver function void StartReceiver(void *pvParameters) { uint32_t retValue; printf("Receiver\r\n"); /* Infinite loop */ for(;;) { if(xQueueReceive(Queue1Handle, &retValue, 500) == pdPASS) printf("Message received: %ld\r\n", retValue); else printf("Queue is empty\r\n"); } } // Sender1 function void StartSender1(void *pvParameters) { uint32_t message = 7; /* Infinite loop */ for(;;) { printf("Sending the message\r\n"); if(xQueueSend(Queue1Handle, &message, 0) != pdPASS) printf("Queue is Full\r\n"); vTaskDelay(1000); } } void USER_RCC_Init( void ){ /* System Clock (SYSCLK) configuration for 48 MHz */ FLASH->ACR &= ~( 0x6UL << 0U );// 2 HCLK cycles latency, if SYSCLK >=24MHz <=48MHz FLASH->ACR |= ( 0x1UL << 0U );// 2 HCLK cycles latency, if SYSCLK >=24MHz <=48MHz while(( FLASH->ACR & ( 0x7UL << 0U )) != 0x001UL );// wait until LATENCY[2:0]=001 RCC->CR &= ~( 0x7UL << 11U );// select HSISYS division factor by 1 while(!( RCC->CR & ( 0x1UL << 10U )));// wait until HSISYS is stable and ready RCC->CFGR &= ~( 0x7UL << 0U );// select HSISYS as the SYSCLK clock source RCC->CFGR &= ~( 0x1UL << 11U );// select HCLK division factor by 1 } // The following makes printf() write to USART2: int _write(int file, uint8_t *ptr, int len) { int DataIdx; for( DataIdx = 0; DataIdx < len; DataIdx++ ){ while(!( USART2->ISR & ( 0x1UL << 7U ))); USART2->TDR = *ptr++; } return len; } void vApplicationIdleHook( void ){ }