USART3不起作用

1万 · 2022-6-18 20:29

STM32F103ZET6 MCU并且遇到一个奇怪的问题，如果我编程和调试或编程和复位我的MCU，用于与从设备通信的USART3不起作用。

2万 · 2022-6-18 20:31

STM32F103ZET6 MCU并且遇到一个奇怪的问题，如果我编程和调试或编程和复位我的MCU，用于与从设备通信的USART3不起作用。

1万 · 2022-6-18 20:33

在调试中，没有USART数据从DMA进入内存，我在从属设备不断发送数据的范围内得到它。

1万 · 2022-6-18 20:36

楼主程序可以公开吗？贴程序看下吧，这么说看不出什么原因

1万 · 2022-6-18 20:40

我检查过：
时钟以适当的速度配置。
USART仍在使用USART3_getchar（0）
重新启动我的USART3。
BOOT0引脚在调试时为低电平。
其他任何东西都没有使用DMA通道。
我已经检查了参考手册和设备数据表，但我正在努力调试/检查代码中的设置，以查看调试/重置运行之间的区别。
// Local Variables
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;

// Code
// Configure UART
RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3 | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);    // USART3 Periph clock enable

// Configure Pins
GPIO_InitStructure.GPIO_Pin                   =  UART3_RX_PIN;
GPIO_InitStructure.GPIO_Speed                =  GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode                   =  GPIO_Mode_IPD;
GPIO_Init(UART3_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin                   =  UART3_TX_PIN;
GPIO_InitStructure.GPIO_Speed                =  GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode                   =  GPIO_Mode_AF_PP;
GPIO_Init(UART3_PORT, &GPIO_InitStructure);

#if(UART3_TX_FLOW_CTS_EN == 1)
// Enable USART3 CTS pin
GPIO_InitStructure.GPIO_Pin                   =  UART3_CTS_PIN;
GPIO_InitStructure.GPIO_Speed                =  GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode                   =  GPIO_Mode_IN_FLOATING;
GPIO_Init(UART3_PORT, &GPIO_InitStructure);
#endif

#if(UART3_RX_FLOW_RTS_EN == 1)
// Enable USART3 RTS pin
GPIO_InitStructure.GPIO_Pin                   =  UART3_RTS_PIN;
GPIO_InitStructure.GPIO_Speed                =  GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode                   =  GPIO_Mode_Out_PP;
GPIO_Init(UART3_PORT, &GPIO_InitStructure);

mCSP_USART3_RTS_PIN_GO;
// initialise the RTS pin as go
#endif

st_uart3_tx_glb.timeout_timer_u16             =  UART3_TX_TIMEOUT;
while(  (uart3_tx_**                         == 0) &&
#if(UART3_TX_FLOW_CTS_EN == 1)

      (mCSP_USART3_CTS_READ                == 0) &&
#endif
      (st_uart3_tx_glb.timeout_timer_u16    >  0) );

//Set USART3 Clock
USART_ClockStructInit(&USART_ClockInitStructure);
USART_ClockInit(USART3, &USART_ClockInitStructure);

USART_InitStructure.USART_BaudRate                =  baud_rate_u32;
USART_InitStructure.USART_WordLength             =  USART_WordLength_8b;
USART_InitStructure.USART_StopBits                =  USART_StopBits_1;
USART_InitStructure.USART_Parity                   =  USART_Parity_No;
#if(UART3_TX_FLOW_CTS_EN == 1)
USART_InitStructure.USART_HardwareFlowControl    =
USART_HardwareFlowControl_CTS;  // Enable USART3 CTS pin
#else
USART_InitStructure.USART_HardwareFlowControl    =
USART_HardwareFlowControl_None;
#endif
USART_InitStructure.USART_Mode                   =  USART_Mode_Rx |
USART_Mode_Tx;
USART_Init(USART3, &USART_InitStructure);

// Enable interrupts
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
DMA_ITConfig(DMA1_Channel2, DMA_IT_TC, ENABLE);

// Enable modules
USART_Cmd(USART3, ENABLE);
USART_DMACmd(USART3, USART_DMAReq_Rx, ENABLE);

// Enable the UART3 Interupt
//  NVIC_InitStructure.NVIC_IRQChannel                   =  USART3_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=USART3_IRQ_PREM_PRI;
//  NVIC_InitStructure.NVIC_IRQChannelSubPriority = USART3_IRQ_SUB_PRI;
//  NVIC_InitStructure.NVIC_IRQChannelCmd                =  ENABLE;
//  NVIC_Init(&NVIC_InitStructure);

// Configure DMA
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);                               // DMA1 Periph clock enable

st_uart3_tx_glb.cnt_u8                            =  st_uart3_tx_glb.wr_index_u8;

DMA_DeInit(DMA1_Channel2);
DMA_StructInit(&DMA_UART3_InitStructure);
DMA_UART3_InitStructure.DMA_PeripheralBaseAddr    =  (uint32_t)&USART3->DR;
DMA_UART3_InitStructure.DMA_MemoryBaseAddr       =  (uint32_t)uart3_rx_buffer_a_u8_glb;
DMA_UART3_InitStructure.DMA_DIR                   =  DMA_DIR_PeripheralSRC;
DMA_UART3_InitStructure.DMA_BufferSize             =  st_uart3_tx_glb.cnt_u8;
DMA_UART3_InitStructure.DMA_PeripheralInc          =  DMA_PeripheralInc_Disable;
DMA_UART3_InitStructure.DMA_MemoryInc             =  DMA_MemoryInc_Enable;
DMA_UART3_InitStructure.DMA_PeripheralDataSize    =  DMA_PeripheralDataSize_Byte;
DMA_UART3_InitStructure.DMA_MemoryDataSize       =  DMA_MemoryDataSize_Byte;
DMA_UART3_InitStructure.DMA_Mode                   =  DMA_Mode_Circular;
DMA_UART3_InitStructure.DMA_Priority             =  DMA_Priority_VeryHigh;
DMA_UART3_InitStructure.DMA_M2M                   =  DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_UART3_InitStructure);

// Enable the DMA complete Interupt
NVIC_InitStructure.NVIC_IRQChannel                   =  DMA1_Channel2_IRQn;
NVIC_Init(&NVIC_InitStructure);

DMA_Cmd(DMA1_Channel2, ENABLE);

1万 · 2022-6-18 20:45

在调试期间无法暂停DMA和USART，如果以这种方式错过中断，则可能会失去同步

1万 · 2022-6-18 20:47

可以在stm32f10x.h中看到位定义，但我不确定，我是否需要为USART和DMA定义speicifc DBGMCU_CR位才能在调试中工作？

1万 · 2022-6-18 20:51

应初始化本地结构，否则某些字段可能会产生不可预测的值：

GPIO_InitTypeDef GPIO_InitStructure={};
NVIC_InitTypeDef NVIC_InitStructure={};
USART_InitTypeDef USART_InitStructure={};
USART_ClockInitTypeDef USART_ClockInitStructure={};
mCSP_USART3_RTS_PIN_GO;这句话有什么作用？它是一个宏还是什么？

应声明这些标志volatile，否则您可以在不同的优化设置下获得不同的行为：

while(  (uart3_tx_**                         == 0) &&
#if(UART3_TX_FLOW_CTS_EN == 1)
(mCSP_USART3_CTS_READ                == 0) &&
#endif
(st_uart3_tx_glb.timeout_timer_u16    >  0) );