1. 在头文件中定义基类，再定义父类
class SerialFactory
{
public:
static SerialBase * creatRs485(void);
static SerialBase * creatRs232(void);
};
2.
class SerialGdRs485 : public SerialBase
{
public:
SerialGdRs485();
virtual ~SerialGdRs485();
virtual void close();
virtual bool open(uint8_t);
virtual void setParity(ParityType);
virtual void setDataBits(DataBitsType);
virtual void setStopBits(StopBitsType);
virtual void setBaudRate(BaudRateType);
virtual void setFlowControl(FlowType);
virtual int readBlock(char *data, unsigned int maxlen);
virtual int writeBlock(const char *data, unsigned int len);
private:
u8 serialPort;
u8 parityType;
u8 stopBits;
u32 baudRates;
};
当然这些驱动函数你需要在底层实现：
// BSP_RS485_Init( bsp_rs485_port2 );
// BSP_RS485_BaudRate_Set( bsp_rs485_port2, 115200);
// BSP_RS485_Parity_Set( bsp_rs485_port2, BSP_UART_PAR_NONE );
// BSP_RS485_StopBits_Set(bsp_rs485_port2, BSP_UART_STOP_1 );
// BSP_RS485_Open( bsp_rs485_port2 );
然后在C文件中new一个对象，功能是在一个task中收发rs485数据：
static uint8_t recvBuf[64] = {0};
static SerialBase *pComm[2];
/*!
\brief 主板LED控制任务
*/
void led_task(void *pvParameters)
{
uint8_t test[8] = {0x01, 0x03, 0x00, 0x00, 0x00, 0x10, 0x44, 0x06};
BSP_Led_init();
pComm[0] = SerialFactory::creatRs485();
pComm[0]->setBaudRate(BAUD9600);
pComm[0]->setParity(PAR_NONE);
/*数据位*/
pComm[0]->setDataBits(DATA_8);
pComm[0]->setStopBits(STOP_1); // 停止位
pComm[0]->open(1);
for(;;)
{
/* toggle LED */
MainBoard_LED_TOOGLE();
BSP_Feed_fwdgt();
vTaskDelay(500);
pComm[0]->writeBlock((const char *)test, 8);
pComm[0]->readBlock((char *)recvBuf, 64 );
}
}
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