本文共 3867 字,大约阅读时间需要 12 分钟。
文博客链接:,作者:jdh,转载请注明.
环境:
主机:WIN7
开发环境:MDK4.23
MCU:STM32F103CBT6
源代码:
配置:
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- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 , ENABLE);
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- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
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- NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
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- DMA_DeInit(DMA1_Channel4);
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- DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR);
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- DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Uart_Send_Buffer;
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- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
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- DMA_InitStructure.DMA_BufferSize = 100;
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- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
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- DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;
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- DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
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- DMA_InitStructure.DMA_Priority = DMA_Priority_High;
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- DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
- DMA_Init(DMA1_Channel4,&DMA_InitStructure);
- DMA_ITConfig(DMA1_Channel4,DMA_IT_TC,ENABLE);
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- 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_InitStructure.USART_BaudRate = DEFAULT_BAUD;
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- USART_Init(USART1,&USART_InitStructure);
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- USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
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- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);
- NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
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- USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);
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- USART_Cmd(USART1, ENABLE);
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- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
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- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
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- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
中断函数:
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- void DMA1_Channel4_IRQHandler(void)
- {
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- DMA_ClearFlag(DMA1_FLAG_TC4);
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- DMA_Cmd(DMA1_Channel4,DISABLE);
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- Flag_Uart_Send = 0;
- }
发送测试:
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- Uart_Send_Buffer[0] = 1;
- Uart_Send_Buffer[1] = 2;
- Uart_Send_Buffer[2] = 3;
- Uart_Send_Buffer[3] = 4;
- Uart_Send_Buffer[4] = 5;
- i = 1;
- while (1)
- {
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- while (Flag_Uart_Send);
- Flag_Uart_Send = 1;
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- DMA_SetCurrDataCounter(DMA1_Channel4,i);
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- DMA_Cmd(DMA1_Channel4,ENABLE);
- i++;
- if (i > 5)
- {
- i = 1;
- }
- }