STM32用串口DMA进行蓝牙通讯c语言源码.docxVIP

#include stm32f10x_rcc.h#include include.h/#include delay.h/#include usart2.h#include stdarg.h #include stdio.h #include string.h / /本程序只供学习使用，未经作者许可，不得用于其它任何用途/All rights reserved / _align(8) u8 USART2_SEND_DATA512; _align(8) u8 USART2_RECEIVE_DATAUSART1_MAX_RECV_LEN; _align(8) u8 USART2_RECEIVE_DATA2USART1_MAX_RECV_LEN; u8 USART2_TX_Finish;/ USART1发送完成标志量u8 USART2_RXDATA_Finish;/ USART1发送完成标志量u8 USART2_RXDATA2_Finish;/ USART1发送完成标志量u8 USART2_RXBUF_InUSE;/ USART1发送完成标志量u8 USART2_RXBUF2_InUSE;/ USART1发送完成标志量u8 USART2_RXBUF_DataLen=0;u8 USART2_RXBUF2_DataLen=0;u8 BT_AT_CMD_OK=0;u8 USART2_Data_temp=0;u8 USART2_RX_CNT=0;/ USART1接收字节数/初始化IO 串口2/pclk1:PCLK1时钟频率(Mhz)/bound:波特率 void USART2_Init_BT(u32 pclk1,u32 bound) DMA_InitTypeDef DMA_InitStructure;USART_InitTypeDef USART_InitStructure;NVIC_InitTypeDef NVIC_InitStructure;GPIO_InitTypeDef GPIO_InitStructure; /* DMA1 clock enable Luke Liu*/ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);/* 第1步：打开GPIO和USART部件的时钟 */RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);/* 第2步：将USART Tx的GPIO配置为推挽复用模式 */GPIO_InitStructure.GPIO_Pin = USART2_TxPin;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);/* 第3步：将USART Rx的GPIO配置为浮空输入模式由于CPU复位后，GPIO缺省都是浮空输入模式，因此下面这个步骤不是必须的但是，我还是建议加上便于阅读，并且防止其它地方修改了这个口线的设置参数*/GPIO_InitStructure.GPIO_Pin = USART2_RxPin;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOA, &GPIO_InitStructure);/ uart configuration:USART_InitStructure.USART_BaudRate = 9600;/9600 is for BluetoothUSART_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);/空闲中断/USART_ITConfig(USART1, USART_IT_IDLE , ENABLE);/ 第5步：使能 USART， 配置完毕 /USART_Cmd(USART2, ENABLE); / CPU的小缺陷：串口配置好，如果直接Send，则第1个字节发送不出去如下语句解决第1个字节无法正确发送出去的问题 /USART_ClearFlag(USART2, USART_FLAG_TC);/ 清发送外城标志，Transmission Complete flag /DMA configuration:/* DMA1 Channel7 (triggered by USART2 Tx event) Config must and only can UART2 TX triged*/DMA_DeInit(DMA1_Channel7); DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART2-DR;/(u32)&USART2-DR;/(u32)&USART1-DR;/0x40013804;/(u32)&USART1-DR;DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)USART2_SEND_DATA;DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;DMA_InitStructure.DMA_BufferSize = 512;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_M2M = DMA_M2M_Disable;DMA_Init(DMA1_Channel7, &DMA_InitStructure);DMA_ITConfig(DMA1_Channel7, DMA_IT_TC, ENABLE);DMA_ITConfig(DMA1_Channel7, DMA_IT_TE, ENABLE);/* Enable USART2 DMA TX request */USART_DMACmd(USART2, USART_DMAReq_Tx, ENABLE);DMA_Cmd(DMA1_Channel7, DISABLE);/* DMA1 Channel6 (triggered by USART2 Rx event) Config */DMA_DeInit(DMA1_Channel6); DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART2-DR;/(u32)(&(USART1-DR);/(u32)&USART1-DR;/0x40013804;/(u32)&USART1-DR;DMA_InitStructure.DMA_MemoryBaseAddr = (u32)USART2_RECEIVE_DATA;DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;DMA_InitStructure.DMA_BufferSize = USART1_MAX_RECV_LEN;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_M2M = DMA_M2M_Disable;DMA_Init(DMA1_Channel6, &DMA_InitStructure); USART_ClearFlag(USART2, USART_FLAG_RXNE); USART_DMACmd(USART2, USART_DMAReq_Rx, ENABLE); DMA_ITConfig(DMA1_Channel6, DMA_IT_TC, ENABLE);USART2_RXBUF_InUSE=1;USART2_RXDATA_Finish=0;USART2_RXBUF2_InUSE=0;USART2_RXDATA2_Finish=0; DMA_Cmd(DMA1_Channel6, ENABLE);/NVIC configuration:/* Configure one bit for preemption priority */NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); /* Enable the USART1 Interrupt */NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/Enable DMA Channel6 Interrupt NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel6_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/*Enable DMA Channel7 Interrupt */NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel7_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);u8 BT_get_at_ok()u8 retry=50,t; u8 temp=0;while(retry-)if(BT_AT_CMD_OK=1)BT_AT_CMD_OK=0;temp=1;return temp;Delay_ms(20);return temp;u8 BT_Module_init()u8 retry=10,t; u8 temp=0;USART2_RXBUF_InUSE=1;USART2_RXDATA_Finish=0;USART2_RXBUF2_InUSE=0;USART2_RXDATA2_Finish=0;while(retry-)&(temp=0)printf(AT+CGPSPWR=1rn);/发送AT测试指令BT_u2_printf_BT(AT+CGPSPWRrn);if(BT_AT_CMD_OK=1)BT_AT_CMD_OK=0;temp =1;Delay_ms(500);if(temp=1)temp=0;retry=10;while(retry-)&(temp=0)printf(AT+CGPSRST=1rn);/发送AT测试指令BT_u2_printf_BT(AT+CGPSRSTrn);if(BT_AT_CMD_OK=1)BT_AT_CMD_OK=0;temp =1;Delay_ms(500);if(temp=1)temp=0;retry=10;while(retry-)&(temp=0)printf(AT+CGPSOUT=32rn);/发送AT测试指令BT_u2_printf_BT(AT+CGPSOUT=32rn);if(BT_AT_CMD_OK=1)BT_AT_CMD_OK=0;temp =1;Delay_ms(500);return temp; /串口2,printf 函数/确保一次发送数据不超过USART2_MAX_SEND_LEN字节void BT_u2_printf_BT(char* fmt) /while(DMA1_Channel7-CNDTR!=0);/等待通道7传输完成 /while(USART2_TX_Finish=1)UART_DMA_Enable_BT(DMA1_Channel7,fmt,strlen(fmt); /通过dma发送出去 /开启一次DMA传输void UART_DMA_Enable_BT(DMA_Channel_TypeDef*DMA_CHx,uint8_t *Buf,u8 len)/USART用DMA传输替代查询方式发送，克服被高优先级中断而产生丢帧现象。DMA_Cmd(DMA_CHx, DISABLE); /改变datasize前先要禁止通道工作DMA_CHx-CMAR = (uint32_t)Buf;DMA_CHx-CNDTR=len; /DMA1,传输数据量USART2_TX_Finish=0;/DMA传输开始标志量DMA_Cmd(DMA_CHx, ENABLE); void DMA1_Channel6_IRQHandler(void)uint8_t test=DMA6irq;/USART1_RX_CNT=DMA1_Channel5-CNDTR; DMA_ClearITPendingBit(DMA1_IT_TC6);DMA_ClearITPendingBit(DMA1_IT_TE6);DMA_Cmd(DMA1_Channel6, DISABLE);/关闭DMA,防止处理其间有数据if(USAR