STC12C5A60S2硬件SPI程序

#include "reg52.h" #define MASTER //define:master undefine:slave #define FOSC 11059200L #define BAUD (256-FOSC/32/115200) typedef unsigned char BYTE; typedef unsigned int WORD; typedef unsigned long DWORD; /******************************************** 特殊功能寄存器定义 ********************************************/ sfr AUXR = 0x8e; //Auxiliary register sfr SPSTAT = 0xcd; //SPI status register #define SPIF 0x80 //SPSTAT.7 #define WCOL 0x40 //SPSTAT.6 sfr SPCTL = 0xce; //SPI control register #define SSIG 0x80 //SPCTL.7 #define SPEN 0x40 //SPCTL.6 #define DORD 0x20 //SPCTL.5 #define MSTR 0x10 //SPCTL.4 #define CPOL 0x08 //SPCTL.3 #define CPHA 0x04 //SPCTL.2 #define SPDHH 0x00 //CPU_CLK/4 #define SPDH 0x01 //CPU_CLK/16 #define SPDL 0x02 //CPU_CLK/64 #define SPDLL 0x03 //CPU_CLK/128 sfr SPDAT = 0xcf; //SPI data register sbit SPISS = P1^3; //SPI slave select, connect to slave' SS(P1.4) pin sfr IE2 = 0xAF; //interrupt enable rgister 2 /////////////////////////////////////////////////////////////// #define ESPI 0x02 //IE2.1 void InitUart(); void InitSPI(); void SendUart(BYTE dat); //send data to PC BYTE RecvUart(); //receive data from PC /////////////////////////////////////////////////////////// void main() { InitUart(); //initial UART InitSPI(); //initial SPI IE2 |= ESPI; //开启SPI中断 EA = 1; while (1) { SendUart('a'); // #ifdef MASTER ACC = RecvUart(); SPISS = 0; //pull low slave SS SPDAT = ACC; //trigger SPI send // #endif } } void spi_isr( ) interrupt 9 using 1 //SPI interrupt routine 9 (004BH) { SPSTAT = SPIF | WCOL; //clear SPI status #ifdef MASTER SPISS = 1; //push high slave SS SendUart(SPDAT); //return received SPI data #else //for salve (receive SPI data from master and SPDAT = SPDAT; // send previous SPI data to master) #endif } void InitUart() { SCON = 0x50; //set UART mode as 8-bit variable baudrate TMOD = 0x20; //timer1 as 8-bit auto reload mode // AUXR = 0x40; //timer1 work at 1T mode TH1=0xfd; //11 5200 bps TL1=0xfd; TR1 = 1; EA=1; ES=1; } /////////////////////////////////////////////////////////// void InitSPI() { SPDAT = 0; //initial SPI data SPSTAT = SPIF | WCOL; //clear SPI status #ifdef MASTER SPCTL = SPEN | MSTR; //master mode #else SPCTL = SPEN; //slave mode #endif } void SendUart(BYTE dat) { SBUF = dat; //send current data while (!TI); //wait pre-data sent TI = 0; //clear TI flag } /////////////////////////////////////////////////////////// BYTE RecvUart() { while (!RI); //wait receive complete RI = 0; //clear RI flag return SBUF; //return receive data }