- /*
- 转载请注明出处:tedeum.iteye.com
- /
首先是不使用中断的方法使用usart1,管脚pa9,pa10,此方法已在f3discovery上验证通过,来源:https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2Fcortex_mx_stm32%2Fusart%20code&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B¤tviews=524
- // STM32 USART1 (Tx PA.9, Rx PA.10) STM32F3-Discovery - sourcer32@gmail.com
- #include "stm32f30x.h"
- //
- void RCC_Configuration(void)
- {
- /* Enable GPIO clock */
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
- /* Enable USART clock */
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
- }
- //
- void GPIO_Configuration(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- /* Connect PA9 to USART1_Tx */
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_7);
- /* Connect PA10 to USART1_Rx */
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_7);
- /* Configure USART Tx as alternate function push-pull */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- /* Configure USART Rx as alternate function push-pull */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- }
- //
- void USART1_Configuration(void)
- {
- USART_InitTypeDef USART_InitStructure;
- /* USART resources configuration (Clock, GPIO pins and USART registers) ----*/
- /* USART configured as follow:
- - BaudRate = 115200 baud
- - Word Length = 8 Bits
- - One Stop Bit
- - No parity
- - Hardware flow control disabled (RTS and CTS signals)
- - Receive and transmit enabled
- */
- USART_InitStructure.USART_BaudRate = 115200;
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;
- USART_InitStructure.USART_StopBits = USART_StopBits_1;
- USART_InitStructure.USART_Parity = USART_Parity_No;
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
- /* USART configuration */
- USART_Init(USART1, &USART_InitStructure);
- /* Enable USART */
- USART_Cmd(USART1, ENABLE);
- }
- //
- int main(void)
- {
- RCC_Configuration();
- GPIO_Configuration();
- USART1_Configuration();
- while(1)
- {
- while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); // Wait for Empty
- USART_SendData(USART1, 0x49); // Send 'I'
- }
- while(1); // Don't want to exit
- }
- //
- #ifdef USE_FULL_ASSERT
- /
- * @brief Reports the name of the source file and the source line number
- * where the assert_param error has occurred.
- * @param file: pointer to the source file name
- * @param line: assert_param error line source number
- * @retval None
- */
- void assert_failed(uint8_t* file, uint32_t line)
- {
- /* User can add his own implementation to report the file name and line number,
- ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
- /* Infinite loop */
- while (1)
- {
- }
- }
- #endif
接下来是使用中断的方法,使用USART3,管脚pd8,pd9,来源:https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/STM32F4%20USART%20receive%20problem&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B¤tviews=124
- // STM32 USART IRQ TX/RX Loop (USART3 Tx PD.8, Rx PD.9) STM32F4 Discovery - sourcer32@gmail.com
- #include "stm32f4_discovery.h"
- volatile char StringLoop[] = "The quick brown fox jumps over the lazy dog\r\n";
- //
- void RCC_Configuration(void)
- {
- /* --------------------------- System Clocks Configuration -----------------*/
- /* USART3 clock enable */
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
- /* GPIOD clock enable */
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
- }
- //
- void GPIO_Configuration(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- /*-------------------------- GPIO Configuration ----------------------------*/
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOD, &GPIO_InitStructure);
- /* Connect USART pins to AF */
- GPIO_PinAFConfig(GPIOD, GPIO_PinSource8, GPIO_AF_USART3);
- GPIO_PinAFConfig(GPIOD, GPIO_PinSource9, GPIO_AF_USART3);
- }
- //
- void USART3_Configuration(void)
- {
- USART_InitTypeDef USART_InitStructure;
- /* USARTx configuration ------------------------------------------------------*/
- /* USARTx configured as follow:
- - BaudRate = 9600 baud
- - Word Length = 8 Bits
- - One Stop Bit
- - No parity
- - Hardware flow control disabled (RTS and CTS signals)
- - Receive and transmit enabled
- */
- USART_InitStructure.USART_BaudRate = 9600;
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;
- USART_InitStructure.USART_StopBits = USART_StopBits_1;
- USART_InitStructure.USART_Parity = USART_Parity_No;
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
- USART_Init(USART3, &USART_InitStructure);
- USART_Cmd(USART3, ENABLE);
- USART_ITConfig(USART3, USART_IT_TXE, ENABLE);
- USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
- }
- //
- void NVIC_Configuration(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
- /* Configure the NVIC Preemption Priority Bits */
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
- /* Enable the USART3 Interrupt */
- NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
- //
- void USART3_IRQHandler(void)
- {
- static int tx_index = 0;
- static int rx_index = 0;
- if (USART_GetITStatus(USART3, USART_IT_TXE) != RESET) // Transmit the string in a loop
- {
- USART_SendData(USART3, StringLoop[tx_index++]);
- if (tx_index >= (sizeof(StringLoop) - 1))
- tx_index = 0;
- }
- if (USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) // Received characters modify string
- {
- StringLoop[rx_index++] = USART_ReceiveData(USART3);
- if (rx_index >= (sizeof(StringLoop) - 1))
- rx_index = 0;
- }
- }
- //
- int main(void)
- {
- RCC_Configuration();
- GPIO_Configuration();
- NVIC_Configuration();
- USART3_Configuration();
- while(1); // Don't want to exit
- }
- //
最后,是使用DMA的方法,使用usart5,管脚:pc12,pd2,来源:https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/DMA%20Memory%20To%20UART5&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B¤tviews=760
- // STM32 UART5 DMA TX (Tx PC.12, Rx PD.2) STM32F4 Discovery - sourcer32@gmail.com
- #include "stm32f4_discovery.h"
- //
- void RCC_Configuration(void)
- {
- /* --------------------------- System Clocks Configuration -----------------*/
- /* UART5 clock enable */
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5, ENABLE);
- /* GPIOC and GPIOD clock enable */
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD, ENABLE);
- /* DMA1 clock enable */
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
- }
- //
- void GPIO_Configuration(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- /*-------------------------- GPIO Configuration ----------------------------*/
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; // PC.12 UART5_TX, potential clash SDIN CS43L22
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; // PD.2 UART5_RX
- GPIO_Init(GPIOD, &GPIO_InitStructure);
- /* Connect USART pins to AF */
- GPIO_PinAFConfig(GPIOC, GPIO_PinSource12, GPIO_AF_UART5);
- GPIO_PinAFConfig(GPIOD, GPIO_PinSource2, GPIO_AF_UART5);
- }
- //
- void UART5_Configuration(void)
- {
- USART_InitTypeDef USART_InitStructure;
- /* USARTx configuration ------------------------------------------------------*/
- /* USARTx configured as follow:
- - BaudRate = 115200 baud
- - Word Length = 8 Bits
- - One Stop Bit
- - No parity
- - Hardware flow control disabled (RTS and CTS signals)
- - Receive and transmit enabled
- */
- USART_InitStructure.USART_BaudRate = 115200;
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;
- USART_InitStructure.USART_StopBits = USART_StopBits_1;
- USART_InitStructure.USART_Parity = USART_Parity_No;
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
- USART_Init(UART5, &USART_InitStructure);
- USART_Cmd(UART5, ENABLE);
- }
- //
- char Buffer[] = "The quick brown fox jumps over the lazy dog\r\n";
- void DMA_Configuration(void)
- {
- DMA_InitTypeDef DMA_InitStructure;
- DMA_DeInit(DMA1_Stream7);
- DMA_InitStructure.DMA_Channel = DMA_Channel_4;
- DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; // Transmit
- DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Buffer;
- DMA_InitStructure.DMA_BufferSize = (uint16_t)sizeof(Buffer) - 1;
- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&UART5->DR;
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
- DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
- DMA_InitStructure.DMA_Priority = DMA_Priority_High;
- DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
- DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
- DMA_Init(DMA1_Stream7, &DMA_InitStructure);
- /* Enable the USART Tx DMA request */
- USART_DMACmd(UART5, USART_DMAReq_Tx, ENABLE);
- /* Enable DMA Stream Transfer Complete interrupt */
- DMA_ITConfig(DMA1_Stream7, DMA_IT_TC, ENABLE);
- /* Enable the DMA RX Stream */
- DMA_Cmd(DMA1_Stream7, ENABLE);
- }
- //
- void DMA1_Stream7_IRQHandler(void)
- {
- /* Test on DMA Stream Transfer Complete interrupt */
- if (DMA_GetITStatus(DMA1_Stream7, DMA_IT_TCIF7))
- {
- /* Clear DMA Stream Transfer Complete interrupt pending bit */
- DMA_ClearITPendingBit(DMA1_Stream7, DMA_IT_TCIF7);
- }
- }
- //
- void NVIC_Configuration(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
- /* Configure the Priority Group to 2 bits */
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
- /* Enable the UART5 RX DMA Interrupt */
- NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream7_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
- //
- int main(void)
- {
- RCC_Configuration();
- NVIC_Configuration();
- GPIO_Configuration();
- UART5_Configuration();
- DMA_Configuration();
- while(1); // Don't want to exit
- }
- //
- #ifdef USE_FULL_ASSERT
- /
- * @brief Reports the name of the source file and the source line number
- * where the assert_param error has occurred.
- * @param file: pointer to the source file name
- * @param line: assert_param error line source number
- * @retval None
- */
- void assert_failed(uint8_t* file, uint32_t line)
- {
- /* User can add his own implementation to report the file name and line number,
- ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
- /* Infinite loop */
- while (1)
- {
- }
- }
- #endif
- /
- * @}
- */
- //
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