/* ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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" typedef struct { uint16_t value; uint8_t source; }Data; TaskHandle_t StartDefaultTaskHandle; TaskHandle_t ReceiverHandle, Sender1Handle, Sender2Handle; QueueHandle_t Queue1Handle; void USER_RCC_Init( void ); void StartDefaultTask( void *pvParameters ); void StartReceiver( void *pvParameters ); void StartSender1( void *pvParameters ); void StartSender2( 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, 3, &ReceiverHandle); xTaskCreate(StartSender1, "Sender1", 128, NULL, 2, &Sender1Handle); xTaskCreate(StartSender2, "Sender2", 128, NULL, 2, &Sender2Handle); Queue1Handle = xQueueCreate( 4, sizeof(Data) ); // 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) { Data DataToReceive;/* Create the variable to receive the message */ for(;;) { if(xQueueReceive(Queue1Handle, &DataToReceive, 1000) == pdPASS) { if(DataToReceive.source== 1) printf("Receive msg from Sender 1\r\n"); else printf("Receive msg from Sender 2\r\n"); printf("Msg: 0x%x\r\n",DataToReceive.value); } else printf("Queue is empty\r\n"); } } // Sender1 function void StartSender1(void *pvParameters) { TickType_t xLastWakeTime = xTaskGetTickCount(); Data DataToSend = { 0x2025, 1 }; for(;;) { if(xQueueSend(Queue1Handle, &DataToSend, 0) != pdPASS) /* Send a message into Queue with a 0 timeout */ printf("Full 1\r\n"); vTaskDelayUntil(&xLastWakeTime, 1000); } } // Sender2 function void StartSender2(void *pvParameters) { TickType_t xLastWakeTime = xTaskGetTickCount(); Data DataToSend = { 0x2026, 2 }; for(;;) { if(xQueueSend(Queue1Handle, &DataToSend, 0) != pdPASS) /* Send a message into Queue with a 0 timeout */ printf("Full 2\r\n"); vTaskDelayUntil(&xLastWakeTime, 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 ){ }