C语言串口通信-源代码
#define SER_PARITY_ODD 8 /*/ odd parity*/ #define SER_PARITY_EVEN 24 /*/ even parity*/ #define SER_DIV_LATCH_ON 128 /*/ used to turn reg 0,1 into divisor latch*/ #define PIC_IMR 0x21 /*/ pic's interrupt mask reg.*/ #define PIC_ICR 0x20 /*/ pic's interupt control reg.*/ #define INT_SER_PORT_0 0x0C /*/ port 0 interrupt com 1 & 3*/ #define INT_SER_PORT_1 0x0B /*/ port 0 interrupt com 2 & 4*/ #define SERIAL_BUFF_SIZE 128 /*/ current size of circulating receive buffer*/ void interrupt far (*Old_Isr)(__CPPARGS); /*/ holds old com port interrupt handler*/ char ser_buffer[SERIAL_BUFF_SIZE]; /*/ the receive buffer*/ int ser_end = -1,ser_start=-1; /*/ indexes into receive buffer*/ int ser_ch, char_ready=0; /*/ current character and ready flag*/ int old_int_mask; /*/ the old interrupt mask on the PIC*/ int open_port; /*/ the currently open port*/ int serial_lock = 0; /*/ serial ISR semaphore so the buffer*/ /*/ isn't altered will it is being written*/ /*/ to by the ISR*/ /*-------------写串口-----------------*/ void interrupt far Serial_Isr(__CPPARGS) { serial_lock = 1; ser_ch = inp(open_port + SER_RBF); if (++ser_end > SERIAL_BUFF_SIZE-1) ser_end = 0; ser_buffer[ser_end] = ser_ch; ++char_ready; outp(PIC_ICR,0x20); serial_lock = 0; } int Ready_Serial() { return(char_ready); } /*--------------读串口--------------*/ int Serial_Read() { int ch; while(serial_lock){} if (ser_end != ser_start) { if (++ser_start > SERIAL_BUFF_SIZE-1) ser_start = 0; ch = ser_buffer[ser_start];