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RA4M2-SENSOR是一款体型小巧的开发板，用串口与蓝牙通讯模块相结合，可方便地以手机控制RGB_LED实现彩灯的色彩变换，其整体构成如图1所示。

图1 整体构成 

尽管UART9在调试有较大的优势，但它却缺少向外引出的引脚，故无法直接使用。

图2  UART9引脚 

为此，只能启用串口 UART0，其使用的引脚如图3所示。蓝牙通讯模块可通过 UART0来进行数据的传送。

图3  UART0引脚 

此外，为了变换色彩的需要，选用的是一款RGB_LED模块，并使用CN4接口来与其连接。

图4  CN4接口 

在使用RASC对所用引脚进行配置后，即可生成供KEIL使用的项目工程。

在手机控制下，实现RGB_LED彩灯变换效果的主程序为：

void hal_entry(void)
{
     uint8_t p,f,w,z;
     uint16_t k,u;
     err = R_SCI_UART_Open(&g_uart0_ctrl, &g_uart0_cfg);
     assert(FSP_SUCCESS == err); 
     err = R_SCI_UART_Read(&g_uart0_ctrl, uart_rx_buffer, 3);
     assert(FSP_SUCCESS == err); 
     R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_02, BSP_IO_LEVEL_LOW);
     R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_01_PIN_03, BSP_IO_LEVEL_LOW);
     R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_01_PIN_04, BSP_IO_LEVEL_LOW);
     R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_00, BSP_IO_LEVEL_LOW);
     R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_01, BSP_IO_LEVEL_LOW);
     R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_02, BSP_IO_LEVEL_LOW);
     R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_07, BSP_IO_LEVEL_LOW);
     R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_08, BSP_IO_LEVEL_LOW);
     while(1)
     { 
        if(uart_receive_complete_flag)
        {
           uart_receive_complete_flag = false;
           if(uart_rx_buffer[0] == 0x55 && uart_rx_buffer[1] == 0xAA)
           {
              if(uart_rx_buffer[2] == 0x10)
              {
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_02, BSP_IO_LEVEL_HIGH);        
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_00, BSP_IO_LEVEL_HIGH);    
              }        
              if(uart_rx_buffer[2] == 0x11)
              {
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_02, BSP_IO_LEVEL_LOW);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_00, BSP_IO_LEVEL_LOW);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_07, BSP_IO_LEVEL_HIGH);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_02, BSP_IO_LEVEL_HIGH);                          
              }      
              if(uart_rx_buffer[2] == 0x12)
              {
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_01_PIN_03, BSP_IO_LEVEL_HIGH);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_07, BSP_IO_LEVEL_LOW);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_02, BSP_IO_LEVEL_LOW);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_08, BSP_IO_LEVEL_HIGH);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_01, BSP_IO_LEVEL_HIGH);
              }        
              if(uart_rx_buffer[2] == 0x13)
              {
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_01_PIN_03, BSP_IO_LEVEL_LOW);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_08, BSP_IO_LEVEL_LOW);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_01, BSP_IO_LEVEL_LOW);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_00, BSP_IO_LEVEL_HIGH);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_07, BSP_IO_LEVEL_HIGH); 
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_02, BSP_IO_LEVEL_HIGH);
              }        
              if(uart_rx_buffer[2] == 0x14)
              {
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_01_PIN_04, BSP_IO_LEVEL_HIGH);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_07, BSP_IO_LEVEL_LOW);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_02, BSP_IO_LEVEL_LOW);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_00, BSP_IO_LEVEL_HIGH);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_08, BSP_IO_LEVEL_HIGH);  
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_01, BSP_IO_LEVEL_HIGH);
              }
                           if(uart_rx_buffer[2] == 0x15)
              {
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_01_PIN_04, BSP_IO_LEVEL_LOW);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_07, BSP_IO_LEVEL_HIGH);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_02, BSP_IO_LEVEL_HIGH);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_00, BSP_IO_LEVEL_LOW);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_08, BSP_IO_LEVEL_HIGH);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_01, BSP_IO_LEVEL_HIGH);
              } 
                          if(uart_rx_buffer[2] == 0x16)
              {
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_01_PIN_03, BSP_IO_LEVEL_HIGH);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_07, BSP_IO_LEVEL_HIGH);
                 R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_00, BSP_IO_LEVEL_HIGH);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_08, BSP_IO_LEVEL_HIGH);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_01, BSP_IO_LEVEL_HIGH);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_02, BSP_IO_LEVEL_HIGH);        
              }        
                           if(uart_rx_buffer[2] == 0x17)
              {
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_01_PIN_03, BSP_IO_LEVEL_LOW);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_07, BSP_IO_LEVEL_LOW);
                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_00_PIN_00, BSP_IO_LEVEL_LOW);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_04_PIN_08, BSP_IO_LEVEL_LOW);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_01, BSP_IO_LEVEL_LOW);
                                  R_IOPORT_PinWrite(&g_ioport_ctrl, BSP_IO_PORT_03_PIN_02, BSP_IO_LEVEL_LOW);
              }      
            }
            err = R_SCI_UART_Read(&g_uart0_ctrl, uart_rx_buffer, 3);
            assert(FSP_SUCCESS == err);
                   }
                   R_BSP_SoftwareDelay (100, BSP_DELAY_UNITS_MILLISECONDS);
    }
}

经程序的编译和下载，即可在手机控制下，实现色彩变换的效果。