/*?串口注冊(cè)初始化函數(shù)?*/ void uart_device_init(uint8_t uart_id) { if (uart_id?== 1)
?{ /*?配置串口2收發(fā)fifo?*/ fifo_register(&s_uart_dev[uart_id].tx_fifo,?&s_uart2_tx_buf[0], sizeof(s_uart2_tx_buf),?fifo_lock,?fifo_unlock);
??fifo_register(&s_uart_dev[uart_id].rx_fifo,?&s_uart2_rx_buf[0], sizeof(s_uart2_rx_buf),?fifo_lock,?fifo_unlock); /*?配置串口2?DMA收發(fā)buf?*/ s_uart_dev[uart_id].dmarx_buf?=?&s_uart2_dmarx_buf[0];
??s_uart_dev[uart_id].dmarx_buf_size?= sizeof(s_uart2_dmarx_buf);
??s_uart_dev[uart_id].dmatx_buf?=?&s_uart2_dmatx_buf[0];
??s_uart_dev[uart_id].dmatx_buf_size?= sizeof(s_uart2_dmatx_buf);
??bsp_uart2_dmarx_config(s_uart_dev[uart_id].dmarx_buf, sizeof(s_uart2_dmarx_buf));
??s_uart_dev[uart_id].status??= 0;
?}
} /*?串口發(fā)送函數(shù)?*/ uint16_t uart_write(uint8_t uart_id, const uint8_t *buf, uint16_t size)
{ return fifo_write(&s_uart_dev[uart_id].tx_fifo,?buf,?size);
} /*?串口讀取函數(shù)?*/ uint16_t uart_read(uint8_t uart_id, uint8_t *buf, uint16_t size)
{ return fifo_read(&s_uart_dev[uart_id].rx_fifo,?buf,?size);
}

7 相關(guān)文章

依賴的fifo參考該文章：

通用環(huán)形緩沖區(qū)模塊：

https://acuity.blog.csdn.net/article/details/78902689

8 完整源碼

代碼倉(cāng)庫(kù)：

https://github.com/Prry/stm32f0-uart-dma

串口&DMA底層配置：

左右滑動(dòng)查看全部代碼>>>

#include  #include  #include  #include "stm32f0xx.h" #include "bsp_uart.h" /**
?*?@brief??
?*?@param??
?*?@retval?
?*/ static void bsp_uart1_gpio_init(void) {
????GPIO_InitTypeDef????GPIO_InitStructure; #if 0 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB,?ENABLE);
?
????GPIO_PinAFConfig(GPIOB,?GPIO_PinSource6,?GPIO_AF_0);
????GPIO_PinAFConfig(GPIOB,?GPIO_PinSource7,?GPIO_AF_0);?
?
?GPIO_InitStructure.GPIO_Pin??=?GPIO_Pin_6?|?GPIO_Pin_7;
????GPIO_InitStructure.GPIO_Mode??=?GPIO_Mode_AF;
?GPIO_InitStructure.GPIO_OType??=?GPIO_OType_PP;
????GPIO_InitStructure.GPIO_Speed???=?GPIO_Speed_Level_3;
????GPIO_InitStructure.GPIO_PuPd??=?GPIO_PuPd_UP;
????GPIO_Init(GPIOB,?&GPIO_InitStructure); #else RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,?ENABLE);
?
????GPIO_PinAFConfig(GPIOB,?GPIO_PinSource9,?GPIO_AF_1);
????GPIO_PinAFConfig(GPIOB,?GPIO_PinSource10,?GPIO_AF_1);?
?
?GPIO_InitStructure.GPIO_Pin??=?GPIO_Pin_9?|?GPIO_Pin_10;
????GPIO_InitStructure.GPIO_Mode??=?GPIO_Mode_AF;
?GPIO_InitStructure.GPIO_OType??=?GPIO_OType_PP;
????GPIO_InitStructure.GPIO_Speed???=?GPIO_Speed_Level_3;
????GPIO_InitStructure.GPIO_PuPd??=?GPIO_PuPd_UP;
????GPIO_Init(GPIOA,?&GPIO_InitStructure); #endif } /**
?*?@brief??
?*?@param??
?*?@retval?
?*/ static void bsp_uart2_gpio_init(void) {
?GPIO_InitTypeDef?GPIO_InitStructure;
?
?RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB,?ENABLE);
?
?GPIO_PinAFConfig(GPIOA,?GPIO_PinSource2,?GPIO_AF_1);
?GPIO_PinAFConfig(GPIOA,?GPIO_PinSource3,?GPIO_AF_1);
?
?GPIO_InitStructure.GPIO_Pin???=?GPIO_Pin_2?|?GPIO_Pin_3;
?GPIO_InitStructure.GPIO_Mode??=?GPIO_Mode_AF;
?GPIO_InitStructure.GPIO_OType?=?GPIO_OType_PP;
?GPIO_InitStructure.GPIO_Speed?=?GPIO_Speed_10MHz;
?GPIO_InitStructure.GPIO_PuPd??=?GPIO_PuPd_UP;
?GPIO_Init(GPIOA,?&GPIO_InitStructure);
} /**
?*?@brief??
?*?@param??
?*?@retval?
?*/ void bsp_uart1_init(void) {
?USART_InitTypeDef?USART_InitStructure;
?NVIC_InitTypeDef?NVIC_InitStructure;
?
?bsp_uart1_gpio_init(); /*?使能串口和DMA時(shí)鐘?*/ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,?ENABLE);
?RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,?ENABLE);
?
?USART_InitStructure.USART_BaudRate????????????= 57600;
?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(USART1,?&USART_InitStructure);
?
?USART_ITConfig(USART1,?USART_IT_IDLE,?ENABLE); /*?使能空閑中斷?*/ USART_OverrunDetectionConfig(USART1,?USART_OVRDetection_Disable);
?
?USART_Cmd(USART1,?ENABLE);
?USART_DMACmd(USART1,?USART_DMAReq_Rx|USART_DMAReq_Tx,?ENABLE); /*?使能DMA收發(fā)?*/ /*?串口中斷?*/ NVIC_InitStructure.NVIC_IRQChannel?????????=?USART1_IRQn;
?NVIC_InitStructure.NVIC_IRQChannelPriority?= 2;
?NVIC_InitStructure.NVIC_IRQChannelCmd??????=?ENABLE;
?NVIC_Init(&NVIC_InitStructure); /*?DMA中斷?*/ NVIC_InitStructure.NVIC_IRQChannel??????=?DMA1_Channel2_3_IRQn;???????
???NVIC_InitStructure.NVIC_IRQChannelPriority?= 0;?
?NVIC_InitStructure.NVIC_IRQChannelCmd??????=?ENABLE;
???NVIC_Init(&NVIC_InitStructure);
} /**
?*?@brief??
?*?@param??
?*?@retval?
?*/ void bsp_uart2_init(void) {
?USART_InitTypeDef?USART_InitStructure;
?NVIC_InitTypeDef?NVIC_InitStructure;
?
?bsp_uart2_gpio_init(); /*?使能串口和DMA時(shí)鐘?*/ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,?ENABLE);
?RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,?ENABLE);

?USART_InitStructure.USART_BaudRate????????????= 57600;
?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(USART2,?&USART_InitStructure);
?
?USART_ITConfig(USART2,?USART_IT_IDLE,?ENABLE); /*?使能空閑中斷?*/ USART_OverrunDetectionConfig(USART2,?USART_OVRDetection_Disable);
?
?USART_Cmd(USART2,?ENABLE);
?USART_DMACmd(USART2,?USART_DMAReq_Rx|USART_DMAReq_Tx,?ENABLE); /*?使能DMA收發(fā)?*/ /*?串口中斷?*/ NVIC_InitStructure.NVIC_IRQChannel?????????=?USART2_IRQn;
?NVIC_InitStructure.NVIC_IRQChannelPriority?= 2;
?NVIC_InitStructure.NVIC_IRQChannelCmd??????=?ENABLE;
?NVIC_Init(&NVIC_InitStructure); /*?DMA中斷?*/ NVIC_InitStructure.NVIC_IRQChannel?????????=?DMA1_Channel4_5_IRQn;???????
???NVIC_InitStructure.NVIC_IRQChannelPriority?= 0;?
?NVIC_InitStructure.NVIC_IRQChannelCmd??????=?ENABLE;
???NVIC_Init(&NVIC_InitStructure);
} void bsp_uart1_dmatx_config(uint8_t *mem_addr, uint32_t mem_size) {
???DMA_InitTypeDef?DMA_InitStructure;
?
?DMA_DeInit(DMA1_Channel2);
?DMA_Cmd(DMA1_Channel2,?DISABLE);
?DMA_InitStructure.DMA_PeripheralBaseAddr??=?(uint32_t)&(USART1->TDR);
?DMA_InitStructure.DMA_MemoryBaseAddr???=?(uint32_t)mem_addr;?
?DMA_InitStructure.DMA_DIR??????=?DMA_DIR_PeripheralDST; /*?傳輸方向:內(nèi)存->外設(shè)?*/ DMA_InitStructure.DMA_BufferSize????=?mem_size;?
?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_Normal;?
?DMA_InitStructure.DMA_Priority?????=?DMA_Priority_High;?
?DMA_InitStructure.DMA_M2M??????=?DMA_M2M_Disable;?
?DMA_Init(DMA1_Channel2,?&DMA_InitStructure);??
?DMA_ITConfig(DMA1_Channel2,?DMA_IT_TC|DMA_IT_TE,?ENABLE);?
?DMA_ClearFlag(DMA1_IT_TC2); /*?清除發(fā)送完成標(biāo)識(shí)?*/ DMA_Cmd(DMA1_Channel2,?ENABLE);?
} void bsp_uart1_dmarx_config(uint8_t *mem_addr, uint32_t mem_size) {
???DMA_InitTypeDef?DMA_InitStructure;
?
?DMA_DeInit(DMA1_Channel3);?
?DMA_Cmd(DMA1_Channel3,?DISABLE);
?DMA_InitStructure.DMA_PeripheralBaseAddr??=?(uint32_t)&(USART1->RDR);
?DMA_InitStructure.DMA_MemoryBaseAddr???=?(uint32_t)mem_addr;?
?DMA_InitStructure.DMA_DIR??????=?DMA_DIR_PeripheralSRC; /*?傳輸方向:外設(shè)->內(nèi)存?*/ DMA_InitStructure.DMA_BufferSize????=?mem_size;?
?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_VeryHigh;?
?DMA_InitStructure.DMA_M2M??????=?DMA_M2M_Disable;?
?DMA_Init(DMA1_Channel3,?&DMA_InitStructure);?
?DMA_ITConfig(DMA1_Channel3,?DMA_IT_TC|DMA_IT_HT|DMA_IT_TE,?ENABLE);/*?使能DMA半滿、全滿、錯(cuò)誤中斷?*/ DMA_ClearFlag(DMA1_IT_TC3);
?DMA_ClearFlag(DMA1_IT_HT3);
?DMA_Cmd(DMA1_Channel3,?ENABLE);?
} uint16_t bsp_uart1_get_dmarx_buf_remain_size(void)
{ return DMA_GetCurrDataCounter(DMA1_Channel3); /*?獲取DMA接收buf剩余空間?*/ } void bsp_uart2_dmatx_config(uint8_t *mem_addr, uint32_t mem_size) {
???DMA_InitTypeDef?DMA_InitStructure;
?
?DMA_DeInit(DMA1_Channel4);
?DMA_Cmd(DMA1_Channel4,?DISABLE);
?DMA_InitStructure.DMA_PeripheralBaseAddr??=?(uint32_t)&(USART2->TDR);
?DMA_InitStructure.DMA_MemoryBaseAddr???=?(uint32_t)mem_addr;?
?DMA_InitStructure.DMA_DIR??????=?DMA_DIR_PeripheralDST; /*?傳輸方向:內(nèi)存->外設(shè)?*/ DMA_InitStructure.DMA_BufferSize????=?mem_size;?
?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_Normal;?
?DMA_InitStructure.DMA_Priority?????=?DMA_Priority_High;?
?DMA_InitStructure.DMA_M2M??????=?DMA_M2M_Disable;?
?DMA_Init(DMA1_Channel4,?&DMA_InitStructure);??
?DMA_ITConfig(DMA1_Channel4,?DMA_IT_TC|DMA_IT_TE,?ENABLE);?
?DMA_ClearFlag(DMA1_IT_TC4); /*?清除發(fā)送完成標(biāo)識(shí)?*/ DMA_Cmd(DMA1_Channel4,?ENABLE);?
} void bsp_uart2_dmarx_config(uint8_t *mem_addr, uint32_t mem_size) {
???DMA_InitTypeDef?DMA_InitStructure;
?
?DMA_DeInit(DMA1_Channel5);?
?DMA_Cmd(DMA1_Channel5,?DISABLE);
?DMA_InitStructure.DMA_PeripheralBaseAddr??=?(uint32_t)&(USART2->RDR);
?DMA_InitStructure.DMA_MemoryBaseAddr???=?(uint32_t)mem_addr;?
?DMA_InitStructure.DMA_DIR??????=?DMA_DIR_PeripheralSRC; /*?傳輸方向:外設(shè)->內(nèi)存?*/ DMA_InitStructure.DMA_BufferSize????=?mem_size;?
?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_VeryHigh;?
?DMA_InitStructure.DMA_M2M??????=?DMA_M2M_Disable;?
?DMA_Init(DMA1_Channel5,?&DMA_InitStructure);?
?DMA_ITConfig(DMA1_Channel5,?DMA_IT_TC|DMA_IT_HT|DMA_IT_TE,?ENABLE);/*?使能DMA半滿、全滿、錯(cuò)誤中斷?*/ DMA_ClearFlag(DMA1_IT_TC5);
?DMA_ClearFlag(DMA1_IT_HT5);
?DMA_Cmd(DMA1_Channel5,?ENABLE);?
} uint16_t bsp_uart2_get_dmarx_buf_remain_size(void)
{ return DMA_GetCurrDataCounter(DMA1_Channel5); /*?獲取DMA接收buf剩余空間?*/ }

壓力測(cè)試：

• 1.5Mbps波特率，串口助手每毫秒發(fā)送1k字節(jié)數(shù)據(jù)，stm32f0 DMA接收數(shù)據(jù)，再通過DMA發(fā)送回串口助手，毫無(wú)壓力。
• 1.5Mbps波特率，可傳輸大文件測(cè)試，將接收數(shù)據(jù)保存為文件，與源文件比較。
• 串口高波特率測(cè)試需要USB轉(zhuǎn)TLL工具及串口助手都支持才可行，推薦CP2102、FT232芯片的USB轉(zhuǎn)TTL工具。

原文鏈接：https://blog.csdn.net/qq_20553613/article/details/108367512

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