[问答]

为什么在本例中接收器中断对USART1和USART3有效，但在UART4上无效？

270 USART

问答对人有帮助，内容完整，我也想知道答案 0 #define STARTUP_MSG "Test Rx-interruptn" #include #include "STM32f4xx_hal.h" #define get_RTC HAL_Gettick #define LED_inv HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_5) #define LED_on HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET) #define LED_off HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET) void waitXms( uint32_t ); void USART1_IRQHandler( void ); void USART3_IRQHandler( void ); void UART4_IRQHandler( void ); void uart1_init( void ); void uart2_init( void ); void uart3_init( void ); void uart4_init( void ); UART_HandleTypeDef hU1, hU2, hU3, hU4; /---------------------------------------------------------------------------/ /* UART1 Interrupt Service Routine / void USART1_IRQHandler( void ) { uint8_t uc; uc = (&hU1)->Instance->DR; // Read data and clear flag putchar( uc ); // Echo to debug-uart LED_inv; // Toggle LED to check if program comes here } void uart1_init( void ) { GPIO_InitTypeDef GPIO_InitStruct; __GPIOA_CLK_ENABLE(); GPIO_InitStruct.Pin = GPIO_PIN_9 \| GPIO_PIN_10; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_LOW; GPIO_InitStruct.Alternate = GPIO_AF7_USART1; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); // PA9 = TxD1, PA10 = RxD1 Alternate Function 8 __USART1_CLK_ENABLE(); hU1.Instance = USART1; hU1.Init.BaudRate = 38400; hU1.Init.WordLength = UART_WORDLENGTH_8B; hU1.Init.StopBits = UART_STOPBITS_1; hU1.Init.Parity = UART_PARITY_NONE; hU1.Init.Mode = UART_MODE_TX_RX; hU1.Init.HwFlowCtl = UART_HWCONTROL_NONE; hU1.Init.OverSampling = UART_OVERSAMPLING_16; HAL_UART_Init(&hU1); / Peripheral interrupt init/ HAL_NVIC_SetPriority(USART1_IRQn, 0, 0); HAL_NVIC_EnableIRQ(USART1_IRQn); __HAL_USART_ENABLE_IT(&hU1, UART_IT_RXNE); } /---------------------------------------------------------------------------/ void uart2_init( void ) { GPIO_InitTypeDef GPIO_InitStruct; __GPIOA_CLK_ENABLE(); GPIO_InitStruct.Pin = GPIO_PIN_2 \| GPIO_PIN_3; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_LOW; GPIO_InitStruct.Alternate = GPIO_AF7_USART2; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);// PA2 = TxD2 Alternate Function 8 // PA3 = RxD2 Alternate Function 8 __USART2_CLK_ENABLE(); hU2.Instance = USART2; hU2.Init.BaudRate = 38400; hU2.Init.WordLength = UART_WORDLENGTH_8B; hU2.Init.StopBits = UART_STOPBITS_1; hU2.Init.Parity = UART_PARITY_NONE; hU2.Init.Mode = UART_MODE_TX_RX; hU2.Init.HwFlowCtl = UART_HWCONTROL_NONE; hU2.Init.OverSampling = UART_OVERSAMPLING_16; HAL_UART_Init(&hU2); // No interrupt for debug-USART } /---------------------------------------------------------------------------/ / UART3 Interrupt Service Routine / void USART3_IRQHandler( void ) { uint8_t uc; uc = (&hU3)->Instance->DR; // Read data and clear flag putchar( uc ); // Echo to debug-uart LED_inv; // Toggle LED to check if program comes here } void uart3_init( void ) { GPIO_InitTypeDef GPIO_InitStruct; __GPIOC_CLK_ENABLE(); GPIO_InitStruct.Pin = GPIO_PIN_5; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_LOW; GPIO_InitStruct.Alternate = GPIO_AF7_USART3; HAL_GPIO_Init(GPIOC, &GPIO_InitStruct); // PC5 = RxD3 Alternate Function 7 __USART3_CLK_ENABLE(); hU3.Instance = USART3; hU3.Init.BaudRate = 38400; hU3.Init.WordLength = UART_WORDLENGTH_8B; hU3.Init.StopBits = UART_STOPBITS_1; hU3.Init.Parity = UART_PARITY_NONE; hU3.Init.Mode = UART_MODE_RX; // Only receiver hU3.Init.HwFlowCtl = UART_HWCONTROL_NONE; hU3.Init.OverSampling = UART_OVERSAMPLING_16; HAL_UART_Init(&hU3); / Peripheral interrupt init/ HAL_NVIC_SetPriority(USART3_IRQn, 0, 0); HAL_NVIC_EnableIRQ(USART3_IRQn); __HAL_USART_ENABLE_IT(&hU3, UART_IT_RXNE); } /---------------------------------------------------------------------------/ / UART4 Interrupt Service Routine / void UART4_IRQHandler( void ) { uint8_t uc; uc = (&hU4)->Instance->DR; // Read data and clear flag putchar( uc ); // Echo to debug-uart LED_inv; // Toggle LED to check if program comes here } void uart4_init( void ) { GPIO_InitTypeDef GPIO_InitStruct; __GPIOA_CLK_ENABLE(); GPIO_InitStruct.Pin = GPIO_PIN_0; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FAST; GPIO_InitStruct.Alternate = GPIO_AF8_UART4; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); // PA0 = TxD4 Alternate Function 8 GPIO_InitStruct.Pin = GPIO_PIN_1; GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FAST; GPIO_InitStruct.Alternate = GPIO_AF8_UART4; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); // PA1 = RxD4 Alternate Function 8 __UART4_CLK_ENABLE(); hU4.Instance = UART4; hU4.Init.BaudRate = 38400; hU4.Init.WordLength = UART_WORDLENGTH_8B; hU4.Init.StopBits = UART_STOPBITS_1; hU4.Init.Parity = UART_PARITY_NONE; hU4.Init.Mode = UART_MODE_TX_RX; hU4.Init.HwFlowCtl = UART_HWCONTROL_NONE; hU4.Init.OverSampling = UART_OVERSAMPLING_16; HAL_UART_Init(&hU4); / Peripheral interrupt init/ HAL_NVIC_SetPriority(UART4_IRQn, 0, 0); HAL_NVIC_EnableIRQ(UART4_IRQn); __HAL_USART_ENABLE_IT(&hU4, UART_IT_RXNE); } /---------------------------------------------------------------------------/ int main( void ) { GPIO_InitTypeDef GPIO_InitStruct; // Reset of all peripherals, Initializes the Flash interface and the Systick. HAL_Init(); __HAL_RCC_GPIOA_CLK_ENABLE(); GPIO_InitStruct.Pin = GPIO_PIN_5; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FAST; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);// PA5 == LED uart2_init(); // Debug-UART (putchar) printf( STARTUP_MSG ); //uart1_init(); // OK //uart3_init(); // OK uart4_init(); // NOT WORKING while(1) { //LED_inv; waitXms( 500 ); } } / ------------------------------------------------------------------------- / // Debug goes to Nucleo-standard UART2/TxD2/PA2 int putchar( int val ) { if( 10 == val ) putchar( 13 ); while( __HAL_UART_GET_FLAG( &hU2, UART_FLAG_TC) != SET); // Wait for empty register (&hU2)->Instance->DR = val; // Direct write to register return val; } / ------------------------------------------------------------------------ / void waitXms( uint32_t loop ) { uint32_t ul; while( loop ) { for( ul=0; ul < 10000U; ul++ ) asm(" nop"); loop--; } } /----------------------------------------------------------------------------*/ 0
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答案对人有帮助，有参考价值 0 F446RE 不是 F1 系列 GPIO_InitStruct.Mode = GPIO_MODE _INPUT ; //使用GPIO_MODE _AF_PP

2023-1-16 11:19:42 评论举报刘悦竹