WhyCan Forum(哇酷开发者社区)

void sys_uart_init(void)
{
  uint32_t addr;
  uint32_t val;

    
  /* Config GPIOE1 and GPIOE0 to txd2 and rxd2 */
  addr = PIO_REG_BASE+PE_OFFSET+CFG0_OFFSET;         //PE7所在寄存器
  val = read32(addr);
  val &= ~(0xf << ((7 & 0x7) << 2));                //0FFF_FFFF,PE7清零，其他位不变
  val |= ((0x3 & 0x7) << ((7 & 0x7) << 2));         //PE7位写入101，复用为TX
  write32(addr, val);

  addr = PIO_REG_BASE+PE_OFFSET+CFG1_OFFSET;         //PE8所在寄存器
  val = read32(addr);
  val &= ~(0xf << ((0 & 0x7) << 2));                //FFF0,PE8清零，其他位不变
  val |= ((0x3 & 0x7) << ((0 & 0x7) << 2));
  write32(addr, val);

  /* Open the clock gate for uart2 */
  addr = 0x01c20068;
  val = read32(addr);
  val |= 1 << 22;
  write32(addr, val);

  /* Deassert uart2 reset */
  addr = 0x01c202d0;                                //总线软复位寄存器，Bus Software Reset Register 2
  val = read32(addr);
  val |= 1 << 22;
  write32(addr, val);

  /* Config uart2 to 921600-8-1-0 */
  addr = 0x01c25800;
  write32(addr + 0x04, 0x0);
  write32(addr + 0x08, 0xf7);
  write32(addr + 0x10, 0x0);
  val = read32(addr + 0x0c);
  val |= (1 << 7);
  write32(addr + 0x0c, val);                        //选择波特率传感器
  write32(addr + 0x00, 0x07 & 0xff);                //低八位
  write32(addr + 0x04, (0x07 >> 8) & 0xff);         //高八位
  val = read32(addr + 0x0c);                        //读传感器
  val &= ~(1 << 7);                                 //清零分频寄存器位
  write32(addr + 0x0c, val);                        //锁位
  val = read32(addr + 0x0c);                        //再次读串口寄存器
  val &= ~0x1f;                                     //只保留高三位，后五位清零
  val |= (0x3 << 0) | (0 << 2) | (0x0 << 3);
  write32(addr + 0x0c, val);
  
  /*初始化接控制板串口PA2、PA3*/
  addr=PIO_REG_BASE+PA_OFFSET+CFG0_OFFSET;
  val  = read32(addr);                              //读PA寄存器值
  val &= ~(0Xf<<((3&0x7)<<2));                      //与0fff，清除PA3
  val &= ~(0Xf<<((2&0x7)<<2));                      //与f0ff，清除PA2
  val |= ((5 & 0x7)<<((3 & 0x7)<<2));               //PA3位或0x5
  val |= ((5 & 0x7)<<((2 & 0x7)<<2));               //PA2位或0x5          目前寄存器，55aa，aa未知
  write32(addr,val);
  /*    打开UART1时钟树  */
  addr=0x01c20000+0x68;
  val=read32(addr);
  val |= 1<<21 ;
  write32(addr,val);
  /*    软件复位UART2   */
  addr=0x01c20000+0x02d0;
  val  = read32(addr);
  val |= 1<<21;
  write32(addr,val);
  
  /* Config uart1 to 921600-8-1-0 */
  addr = 0x01c25400;
  write32(addr + 0x04, 0x0);
  write32(addr + 0x08, 0xf7);
  write32(addr + 0x10, 0x0);
  val = read32(addr + 0x0c);
  val |= (1 << 7);
  write32(addr + 0x0c, val);                        //选择波特率传感器
  write32(addr + 0x00, 0x07 & 0xff);                //低八位
  write32(addr + 0x04, (0x07 >> 8) & 0xff);         //高八位
  val = read32(addr + 0x0c);                        //读传感器
  val &= ~(1 << 7);                                 //清零分频寄存器位
  write32(addr + 0x0c, val);                        //锁位
  
  val = read32(addr + 0x04);                        //锁位后读取中断标志位启动接收中断
  val |= 0x01;
  write32(addr + 0x04,val);                         //写入数据
  
  val = read32(addr + 0x0c);                        //再次读串口寄存器
  val &= ~0x1f;                                     //只保留高三位，后五位清零
  val |= (0x3 << 0) | (0 << 2) | (0x0 << 3);
  write32(addr + 0x0c, val);
  
//  f1c100s_intc_set_isr(F1C100S_IRQ_UART1,UART1_Rx_irq);       //解除注释程序无法运行
//  f1c100s_intc_enable_irq(F1C100S_IRQ_UART1);                      //解除注释程序无法运行
  
}

static void UART1_Rx_irq(void)
{
    uint8_t data;
    uint32_t addr;
    
    if((read32(0x01c25400+0x14)&&0x01))
    {
        addr=0x01c25400+0x00;
        data=(uint8_t)read32(addr);
        sysprintf("%c\n",data);
    }
}