//Byte Received Event
void (*SerialPort_Event_ByteReceived)(unsigned char byte);
//initialize registers pertinent to serial port
void SerialPort_Init_Low(){
//set and run Timer1
//mode2: 8bit, auto reload initial value
//9600bps and 11.0592MHz => 0xfd(initial value)
TMOD = 0x20;
TH1 = 0xfd;
TL1 = 0xfd;
TR1 = 1;
//set serial port configuration and enable receive
//mode1: asyc 10bit(8 data bit), alterable baud rate
SM0 = 0;
SM1 = 1;
REN = 1;
//set interruption
//enable all and serial port interruption
EA = 1;
ES = 1;
}
//initialize registers pertinent to serial port for esp8266
void SerialPort_Init_High(){
//SMOD = 1
PCON |= 0x80;
//set and run Timer1
//mode2: 8bit, auto reload initial value
//115200bps and 22.1184MHz => 0xfd(initial value)
TMOD = 0x20;
TH1 = 0xff;
TL1 = 0xff;
TR1 = 1;
//set serial port configuration and enable receive
//mode1: asyc 10bit(8 data bit), alterable baud rate
SM0 = 0;
SM1 = 1;
REN = 1;
//set interruption
//enable all and serial port interruption
EA = 1;
ES = 1;
}
//Send a byte
void SerialPort_SendByte(unsigned char byte){
ES = 0;
SBUF = byte;
while(!TI);
// transmit interrupt
TI = 0;
ES = 1;
}
//Send a data of byte sequence end by 'EOT'
void SerialPort_SendData(unsigned char* bytes){
int i = 0;
while(bytes[ i] != EOT){
SerialPort_SendByte(bytes[ i]);
i++;
}
}
//Occured when byte received
void receivedInterruped() interrupt 4 {
TR0 = 0;
(*SerialPort_Event_ByteReceived)(SBUF);
while(!RI);
RI = 0;
}
简单说一下，这里留了两个初始化函数，SerialPort_Init_Low()用于11.0592MHz下的9600波特率，SerialPort_Init_High()用于22.1184MHz下的115200波特率（此例用这个）。这样写只是为了以后可以重用（软工狗的矫情）。
