STM32F107 串口2 初始化过程中断使能死机

流火七月 · 发表于 2017-2-27 09:17:29

本帖最后由流火七月于 2017-2-27 17:10 编辑

主控芯片：LPC1778
串口：usart2
485芯片：max13487e
问题：与其他硬件控制板通信，同时上电启动，在USART2初始化之时，会死在NVIC_EnableIRQ(irq_temp);这一步

irq_temp参数相关
typedef enum{
      COM0,
      COM1,
      COM2,
      COM3,
      COM4,
}ALL_CH;
IRQn_Type irq_temp = UART0_IRQn;
ch = COM2;
irq_temp = UART0_IRQn + ch;

以下为初始化完整代码
/*****************************************************************************
函数名  : UART_init
功能描述  : 串口初始化
输入参数  : unsigned long sysClk
         unsigned long baudrate
         入参clk：UART模块工作的系统频率
                     入参baudrate：UART工作的波特率
*****************************************************************************/
void UART_init(unsigned long sysClk, unsigned long baudrate, uint8 ch)//可用
{
uint16_t divisor;
      LPC_UART_TypeDef *regaddr = NULL;
      LPC_UART1_TypeDef *regaddr1 = NULL;
      LPC_UART4_TypeDef *regaddr4 = NULL;

      IRQn_Type irq_temp = UART0_IRQn;

      switch(ch)
      {
            case 0:
                     LPC_IOCON->P0_2 &= 0xFFFFFFF8;
                     LPC_IOCON->P0_2 |= 0x00000001;                         /* Pin P0.2 used as TXD0 (Com0) */
                     LPC_IOCON->P0_3 &= 0xFFFFFFF8;
                     LPC_IOCON->P0_3 |= 0x00000001;                         /* Pin P0.3 used as RXD0 (Com0) */
                     regaddr = LPC_UART0;

                     break;
            case 1:
                     LPC_IOCON->P2_0 &= 0xFFFFFFF8;
                  LPC_IOCON->P2_0 |= 0x00000002;          /* Pin P2.0 used as TXD1 (UART1) */
                  LPC_IOCON->P2_1 &= 0xFFFFFFF8;
                  LPC_IOCON->P2_1 |= 0x00000002;          /* Pin P2.1 used as RXD1 (UART1) */
                     regaddr1 = LPC_UART1;

                     break;

            case 2:

                     LPC_SC->PCONP |= ((uint32_t)(1<<24));

                     #if 0//开发板使用引脚
                     LPC_IOCON->P0_10 &= 0xFFFFFFF8;
                     LPC_IOCON->P0_10 |= 0x00000001;                      /* Pin P0.10 used as TXD2 (Com0) */
                     LPC_IOCON->P0_11 &= 0xFFFFFFF8;
                     LPC_IOCON->P0_11 |= 0x00000001;                      /* Pin P0.11 used as RXD2 (Com0) */
                     #else//监控板使用引脚
                     LPC_IOCON->P2_8 &= 0xFFFFFFF8;
                     LPC_IOCON->P2_8 |= 0x00000002;                         /* Pin P2.8 used as TXD2 (Com0) */
                     LPC_IOCON->P2_9 &= 0xFFFFFFF8;
                     LPC_IOCON->P2_9 |= 0x00000002;                         /* Pin P2.9 used as RXD2 (Com0) */
                     #endif

                     regaddr = LPC_UART2;

                     break;
            case 3:
                     LPC_SC->PCONP |= ((uint32_t)(1<<25));

                  LPC_IOCON->P0_2 &= 0xFFFFFFF8;
                  LPC_IOCON->P0_2 |= 0x00000002;          /* Pin P0.2 used as TXD0 (Com0) */
                  LPC_IOCON->P0_3 &= 0xFFFFFFF8;
                  LPC_IOCON->P0_3 |= 0x00000002;          /* Pin P0.3 used as RXD0 (Com0) */

                     regaddr = LPC_UART3;

                     break;
            case 4:
                     LPC_SC->PCONP |= ((uint32_t)(1<<8));//复位时被禁用

                  LPC_IOCON->P5_4 &= 0xFFFFFFF8;
                  LPC_IOCON->P5_4 |= 0x00000004;          /* Pin P5.4 used as TXD0 (Com0) */

                  LPC_IOCON->P5_3 &= 0xFFFFFFF8;
                  LPC_IOCON->P5_3 |= 0x00000004;          /* Pin P5.3 used as RXD0 (Com0) */

                     regaddr4 = LPC_UART4;

                     break;
            default:
            break;

      }

      g_uartTxBufferHead[ch] = 0;
      g_uartTxBufferTail[ch] = 0;

      divisor = uartGetDivisorByBaudrate(sysClk, baudrate);

      irq_temp = UART0_IRQn + ch;

      if( ch == COM1)//023和1和4的结构体是不一样的
      {
               regaddr1->LCR  = 0x83;//允许设置波特率

               regaddr1->DLM  = ((divisor >> 8) & 0x00FF);
               regaddr1->DLL  = (divisor & 0x00FF);
               regaddr1->LCR  = 0x03; //锁定波特率
               regaddr1->FCR  = 0x87;//RX FIFO在收到1个字节时产生中断

               regaddr1->IER = IER_RBR | IER_THRE | IER_RLS;//配置中断
      }
      else if( ch == COM4)
      {

               regaddr4->LCR  = 0x83;

               regaddr4->DLM  = ((divisor >> 8) & 0x00FF);
               regaddr4->DLL  = (divisor & 0x00FF);
               regaddr4->LCR  = 0x03;
               regaddr4->FCR  = 0x87;

               regaddr4->IER = IER_RBR | IER_THRE | IER_RLS;

               irq_temp = UART4_IRQn;
      }
      else
      {
               regaddr->LCR  = 0x83;

               regaddr->DLM  = ((divisor >> 8) & 0x00FF);
               regaddr->DLL  = (divisor & 0x00FF);
               regaddr->LCR  = 0x03;
               regaddr->FCR  = 0x87;

               regaddr->IER = IER_RBR | IER_THRE | IER_RLS;
      }

      if(irq_temp != 0)
      {
            My_print("%d\r\n",irq_temp);
      }

      NVIC_EnableIRQ(irq_temp);//串口2初始化在这一步死机

      irq_temp = 0;

}