我正在尝试通过UART在两个STM32F103 MCU之间建立通信。我正在使用STMCubeMX构建外围设备初始化。我已将逻辑上的MCU命名为MASTER和SLAVE。从UART配置为仅发送,而MASTER uart仅接收。我正在使用HAL驱动程序在AtollicTRUEstudio IDE中对MCU进行编程。我想发送uint32_t值,buffer_USART1_rx被声明为易失性uint8_t buffer_USART1_rx [10]。基本上SLAVE UART发送是由Systick定时器每1秒触发一次的,而MASTER UART是在IT模式下定义的,并且一旦中断发生,它就会读取发送的值。
我将示波器探头连接到MASTER的PA10 RX引脚,我发现UART信号很好并且正在通过电线传输。但是要传输的值始终为0,并且永远不会激活HAL_UART_RxCpltCallback中的断点。由于示波器信号正确,因此我认为这是软件问题。 Image of RX PA10 pin of MASTER stm32
这是来自MASTER STM(代码位于主文件中)
UART初始化:
static void MX_USART1_UART_Init(void)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
}
static void MX_NVIC_Init(void)
{
/* USART1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USART1_IRQn);
}
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
__NOP();
}
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
/*UART1 water level from SLAVE */
if(huart->Instance==USART1)
{
water_level=getUSART1();
/* Water level change triggers LCD refresh */
if(water_level_prev!=water_level)
{
lcd_screen_refresh=true;
}
water_level_prev=water_level;
}
else
{
__NOP();
}
/*UART2 target level from NANOPI */
if(huart->Instance==USART2)
{
target_level_pi=getUSART2();
/* Target level change triggers LCD refresh */
if(target_level_pi!=target_level_prev)
{
lcd_screen_refresh=true;
}
}
else
{
__NOP();
}
}
UART反序列化功能:
uint32_t getUSART1()
{
uint32_t num=0;
num |= buffer_USART1_rx[0] << 24;
num |= buffer_USART1_rx[1] << 16;
num |= buffer_USART1_rx[2] << 8;
num |= buffer_USART1_rx[3];
return num;
}
在IT模式下UART的主文件初始化中:
/* Initialize TIM/UART interrupts */
HAL_TIM_IC_Start_IT(&htim4, TIM_CHANNEL_1);
HAL_TIM_IC_Start_IT(&htim4, TIM_CHANNEL_2);
HAL_UART_Receive_IT(&huart1, buffer_USART1_rx, 4);
从MCU配置:
// This is in while loop
if(send_USART==true)
{
buffer[0] = test ;
buffer[1] = test >>8;
buffer[2] = test >> 16;
buffer[3] = test >> 24;
HAL_UART_Transmit(&huart1,buffer,4,2000);
}
else
{
__NOP();
}
// Callback
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
send_USART=false;
}
//Systick timer triggers UART transmit every 1 second
void HAL_SYSTICK_Callback()
{
sys_timer++;
if(sys_timer>=1000)
{
sys_timer=0;
send_USART=true;
}
else
{
__NOP();
}
}
//Global declaration of variables used
/* Timer variables */
uint8_t buffer[10];
volatile uint32_t sys_timer=0;
uint32_t test=10;
/* Boolean variables */
bool send_USART=false;
// UART initialization
/* USART1 init function */
static void MX_USART1_UART_Init(void)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
}
static void MX_NVIC_Init(void)
{
/* USART1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(USART1_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(USART1_IRQn);
}
我希望接收到的值为10(因为我正在序列化SLAVE stm上的“ test”变量,并在反序列化时将其发送到MASTER stm上)
答案 0 :(得分:0)
没关系,我已经找到了问题所在,并且是什么原因造成了
void USART1_IRQHandler(void)
{
/* USER CODE BEGIN USART1_IRQn 0 */
/* USER CODE END USART1_IRQn 0 */
HAL_UART_IRQHandler(&huart1);
/* USER CODE BEGIN USART1_IRQn 1 */
if(huart1.RxState==HAL_UART_STATE_READY)
{
HAL_UART_Receive_IT(&huart1,buffer_USART1_rx,4);
uart1_received=4; //flag da je primljen podatak
__HAL_UART_FLUSH_DRREGISTER(&huart1);
__HAL_UART_CLEAR_FLAG(&huart1, UART_FLAG_RXNE);
}
else
{
__NOP();
}
/* USER CODE END USART1_IRQn 1 */
}
用于处理的代码位于HAL_UART_IRQHandler(&huart1);
之上。这就是为什么它只接收一次数据的原因。当我像上面的代码一样在下面复制它时,一切正常。