精选优质文档-----倾情为你奉上/* ************************************* 注意开SPI的时钟！！！！ 2011年10月29日9:44:52 DA芯片是TLV5620，数据线和时钟都是用SPI的，LOAD线 用GPIOA15来控制！ *******************************************/#include "DSP28_Device.h"void Gpio_select(void);void spi_init(void);void dac_load(char channel,int value);interrupt void cpu_timer0_isr(void);void main(void){ Uint16 voltage = 0; /*初始化系统*/ InitSysCtrl(); /*关中断*/ DINT; IER = 0x0000; IFR = 0x0000; //清中断 /*初始化PIE*/ InitPieCtrl(); /*初始化PIE中断矢量表*/ InitPieVectTable(); Gpio_select(); spi_init(); EALLOW; PieVectTable.TINT0 = &cpu_timer0_isr; EDIS; InitCpuTimers(); ConfigCpuTimer(&CpuTimer0,120,1000); PieCtrl.PIEIER1.bit.INTx7 = 1; IER |= M_INT1; EINT; ERTM; CpuTimer0Regs.TCR.bit.TSS = 0; for(;;) { while(CpuTimer0.InterruptCount < 3 ); CpuTimer0.InterruptCount = 0; dac_load(0,voltage); if( voltage ++ > 255) voltage = 0; }} void Gpio_select(void){ EALLOW; GpioMuxRegs.GPFMUX.bit.SPICLKA_GPIOF2 = 1; GpioMuxRegs.GPFMUX.bit.SPISIMOA_GPIOF0 = 1; GpioMuxRegs.GPADIR.bit.GPIOA15 = 1; GpioDataRegs.GPASET.bit.GPIOA15 = 1; EDIS;}void spi_init(void){ SpiaRegs.SPICCR.all = 0x0000; //spi sw reset = 0; SpiaRegs.SPICTL.bit.CLK_PHASE = 1; //设置clock phase，输出早于输入 SpiaRegs.SPICTL.bit.MASTER_SLAVE = 1; SpiaRegs.SPICTL.bit.TALK = 1; SpiaRegs.SPIBRR = 0x001d; //30M / (29 + 1) = 1MHZ SpiaRegs.SPICCR.all = 0x00ca; // spi sw reset = 1;clock polarity = 1;}interrupt void cpu_timer0_isr(void){ CpuTimer0.InterruptCount ++; PieCtrl.PIEACK.all = PIEACK_GROUP1;}void dac_load(char channel,int value){ SpiaRegs.SPICCR.bit.RESET = 1; //准备发送 SpiaRegs.SPITXBUF = value << 5; //因为是11位数据,要保证左对齐需左移5位 while(SpiaRegs.SPISTS.bit.INT_FLAG == 0); SpiaRegs.SPICCR.bit.RESET = 0; //清标志 GpioDataRegs.GPACLEAR.bit.GPIOA15 = 1; asm(" rpt #500 || nop"); GpioDataRegs.GPASET.bit.GPIOA15 = 1;}专心---专注---专业。