关于STM32L051低功耗串口初始化问题
各位大佬我按照例程初始化串口1,2和第三个低功耗串口，都作为普通串口使用，1,2两个串口可以中断接收和发送，第三个低功耗串口初始化后可以发送但进不了接收中断。这个串口的初始化偶什么特殊要求吗？希望可以得到指点。谢谢各位西边是初始化代码。void Configure_USART_2(void)
{
/* (1) Enable GPIO clock and configures the USART pins *********************/
/* Enable the peripheral clock of GPIO Port */
LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOB);
/* Configure Tx Pin as : Alternate function, High Speed, Push pull, Pull up */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_10, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetAFPin_8_15(GPIOB, LL_GPIO_PIN_10, LL_GPIO_AF_4);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_10, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_10, LL_GPIO_OUTPUT_PUSHPULL);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_10, LL_GPIO_PULL_NO);
/* Configure Rx Pin as : Alternate function, High Speed, Push pull, Pull up */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_11, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetAFPin_8_15(GPIOB, LL_GPIO_PIN_11, LL_GPIO_AF_4);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_11, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_11, LL_GPIO_OUTPUT_PUSHPULL);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_11, LL_GPIO_PULL_NO);
/* (2) NVIC Configuration for USART interrupts */
/*- Set priority for USARTx_IRQn */
/*- Enable USARTx_IRQn */
NVIC_SetPriority(LPUART1_IRQn, 0);
NVIC_EnableIRQ(LPUART1_IRQn);
/* (3) Enable USART peripheral clock and clock source ***********************/
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_LPUART1);
/* Set clock source */
LL_RCC_SetLPUARTClockSource(LL_RCC_LPUART1_CLKSOURCE_HSI);
/* (4) Configure USART functional parameters ********************************/
/* Disable USART prior modifying configuration registers */
/* Note: Commented as corresponding to Reset value */
// LL_USART_Disable(USARTx_INSTANCE);
/* TX/RX direction */
LL_USART_SetTransferDirection(LPUART1, LL_USART_DIRECTION_TX_RX);
/* 8 data bit, 1 start bit, 1 stop bit, no parity */
LL_USART_ConfigCharacter(LPUART1, LL_USART_DATAWIDTH_8B, LL_USART_PARITY_NONE, LL_USART_STOPBITS_1);
LL_LPUART_SetBaudRate(LPUART1, HSI_VALUE, 115200);
/* (5) Enable USART *********************************************************/
LL_USART_Enable(LPUART1);
/* Polling USART initialisation */
while((!(LL_USART_IsActiveFlag_TEACK(LPUART1))) || (!(LL_USART_IsActiveFlag_REACK(LPUART1))))
{
}
/* Enable RXNE and Error interrupts */
LL_USART_EnableIT_RXNE(LPUART1);//UART_HWCONTROL_NONE
LL_USART_EnableIT_ERROR(LPUART1);
}
中断接收程序
void LPUART1_IRQHandler(void)
{
/* Check RXNE flag value in ISR register */
if(LL_USART_IsActiveFlag_RXNE(LPUART1) && LL_USART_IsEnabledIT_RXNE(LPUART1))
{
USART_CharReception_Callback_2();
}
else
{
/* Call Error function */
Error_Callback_2();
}
}
接收处理部分
void USART_CharReception_Callback_2(void)
{
__IO uint32_t received_char;
/* Read Received character. RXNE flag is cleared by reading of RDR register */
received_char = LL_USART_ReceiveData8(LPUART1);
if(received_char==0x55)
{
datasp=0;
data_r=received_char;
datasp+=1; //
}
else if(datasp!=0)
{
data_r=received_char;
datasp+=1;
if(data_r == (datasp-4))
{
switch(data_r) {
case 0xf0:
ADD++;
if(ADD==1)
{
//LED_On();
flag=1;
}
if(ADD==2)
{
//LED_Off();
flag=0;
ADD=0;
}
break;
case 0xf1:
//LED_Off();
break;
case 0xf2:
break;
default :
break;
}
}
}
/* Echo received character on TX */
LL_USART_TransmitData8(LPUART1, received_char);//·¢ËÍ
}
谁可以指点下啊！ 仿真了下找到问题了，中断函数名错了，总是进入.S文件中的无限循环。把.S文件中的中断函数名改了下就可以了。
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