dsp2812的spi

#include "DSP281x_Device.h" // DSP281x Headerfile Include File #include "DSP281x_GlobalPrototypes.h" #include "f2812a.h" //#include "DSP281x_Examples.h" // DSP281x Examples Include File //#include "f2812a.h" // Prototype statements for functions found within this file. // interrupt void ISRTimer2(void); //使用中断：interrupt void ISRTimer2(void); //变量声明 void delay_loop(void); void spi_dlb8(void); void spi_xmit(int a); int spi_rev(); void spi_fifo_init(void); void error(int); void program_stop(); unsigned int var1=0; unsigned int var2=0; unsigned int var3=0; unsigned int var4=0; unsigned int var5=0; unsigned int Test_count=0; unsigned int Test_flag1=0; unsigned int Test_flag2=0; unsigned int Test_flag3=0; unsigned int Test_flag4=0; unsigned int Test_var=0; unsigned int Test_status[32]; unsigned int PASS_flag=0; unsigned int Ret_var1=0; unsigned int Ret_var2=0; //void dac_loop(void); void main(void) { //Step 1，初始化系统控制寄存器、锁相环、看门狗以及时钟默认状态 int i; //为充分发挥片上RAM M0/M1/L0/L1/H0的特性，设置下列寄存器 //DevEmuRegs.M0RAMDFT=0x0300; //DevEmuRegs.M1RAMDFT=0x0300; //DevEmuRegs.L0RAMDFT=0x0300; //DevEmuRegs.L1RAMDFT=0x0300; //DevEmuRegs.H0RAMDFT=0x0300; InitSysCtrl(); //HISPCP/LOSPCP预定标定寄存器设置 SysCtrlRegs.HISPCP.all=0x0001; SysCtrlRegs.LOSPCP.all=0x0002; //Step3,初始化外设中断向量表 //屏蔽和清除所有CPU中断 DINT; IER=0x0000; IFR=0x0000; //初始化PIE向量表 //InitPieVectTable()函数参考中断一章中DSP28_DefaultIsr.c相关代码 //InitPieVectTable(); //Step4,使用特定的函数重新分配向量使能中断 spi_fifo_init();// 初始化Spi FIFO spi_dlb8(); //设置自测试模式 //设置测试状态标志 if (PASS_flag!=0) PASS_flag=0xDEAD; else PASS_flag=0xD0BE; //Step5,循环等待 asm ("ESTOP0");//设置软断点 // for(;;); } //Step5,所有中断服务程序和函数 void delay_loop() { long i; for (i=0;i<1000000;i++){} } void error(int ErrorFlag) { PASS_flag=0xDEAD; Test_status[Test_var]=0xDEAD; } //测试1,SPI 8位字符，自测试，主模式，上升沿，波特率设置0x07F void spi_dlb8() { SpiaRegs.SPICCR.all=0x0007;//SPI复位，设置时钟为上升沿，8位字符长度 SpiaRegs.SPICTL.all=0x0006;// 使能主模式，标准相位 // 使能Talk,SPIINT屏蔽 SpiaRegs.SPIBRR=0x0009;//设置波特率 //Step2,配置芯片的通用数字I/O为希望的功能引脚 EALLOW; GpioMuxRegs.GPFMUX.all=0x000F;//设置GPIO工作在SPI的功能 //Port F MUX-x000 0000 0000 1111 EDIS; //退出复位状态 SpiaRegs.SPICCR.all=0x0087;//使SPI退出复位状态 //使能自测试模式 //位Changes for the test //var3=WREN; spi_xmit(WREN);//发送SPI SpiaRegs.SPICTL.bit.TALK=0; SpiaRegs.SPICTL.bit.TALK=1; //SpiaRegs.SPICCR.bit.SPISWRESET=1; spi_xmit(WRITE); spi_xmit(0x0F); spi_xmit(0x0A); spi_xmit(0x56); //SpiaRegs.SPICCR.bit.SPISWRESET=0; //SpiaRegs.SPICCR.bit.SPISWRESET=1; SpiaRegs.SPICTL.bit.TALK=0; SpiaRegs.SPICTL.bit.TALK=1; spi_xmit(READ); spi_xmit(0x0F); spi_xmit(0x0A); Ret_var1=spi_rev(); spi_xmit(RDSR); Ret_var2=spi_rev(); SpiaRegs.SPICCR.bit.SPISWRESET=0; //while (SpiaRegs.SPIFFRX.bit.RXFFST!=1) {} //Test_flag4=SpiaRegs.SPIRXBUF; //if (Test_flag4!=0x4141) error(1); //Test_status[Test_var]=0x8000;//刷新测试状态 //Test_var++; } void spi_xmit(int a) { SpiaRegs.SPITXBUF=a; } int spi_rev() { return SpiaRegs.SPIRXBUF; } void spi_fifo_init() { //初始化SPI FIFO寄存器 SpiaRegs.SPIFFTX.all=0xE040; SpiaRegs.SPIFFRX.all=0x204F; SpiaRegs.SPIFFCT.all=0x0; }