DSP-F2812-SPI數(shù)模轉(zhuǎn)換例程

1、精選優(yōu)質(zhì)文檔-傾情為你奉上精選優(yōu)質(zhì)文檔-傾情為你奉上專心-專注-專業(yè)專心-專注-專業(yè)精選優(yōu)質(zhì)文檔-傾情為你奉上專心-專注-專業(yè)/* *注意開SPI的時鐘！2011年10月29日9:44:52DA芯片是TLV5620，數(shù)據(jù)線和時鐘都是用SPI的，LOAD線用GPIOA15來控制！*/#include DSP28_Device.hvoid Gpio_select(void);void spi_init(void);void dac_load(char channel,int value);interrupt void cpu_timer0_isr(void);void main(void)Uint

2、16 voltage = 0;/*初始化系統(tǒng)*/InitSysCtrl();/*關(guān)中斷*/DINT;IER = 0 x0000;IFR = 0 x0000;/清中斷/*初始化PIE*/InitPieCtrl();/*初始化PIE中斷矢量表*/InitPieVectTable();Gpio_select();spi_init();EALLOW;PieVectTable.TINT0 = &cpu_timer0_isr;EDIS;InitCpuTimers();ConfigCpuTimer(&CpuTimer0,120,1000);PieCtrl.PIEIER1.bit.INTx7 = 1;IER

3、|= M_INT1;EINT;ERTM;CpuTimer0Regs.TCR.bit.TSS = 0;for(;)while(CpuTimer0.InterruptCount 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;v

4、oid spi_init(void)SpiaRegs.SPICCR.all = 0 x0000;/spi sw reset = 0;SpiaRegs.SPICTL.bit.CLK_PHASE = 1;/設(shè)置clock phase，輸出早于輸入SpiaRegs.SPICTL.bit.MASTER_SLAVE = 1;SpiaRegs.SPICTL.bit.TALK = 1;SpiaRegs.SPIBRR = 0 x001d;/30M / (29 + 1) = 1MHZSpiaRegs.SPICCR.all = 0 x00ca;/ spi sw reset = 1;clock polarity =

5、 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;/準(zhǔn)備發(fā)送SpiaRegs.SPITXBUF = value 5;/因為是11位數(shù)據(jù),要保證左對齊需左移5位while(SpiaRegs.SPISTS.bit.INT_FLAG = 0);SpiaRegs.SPICCR.bit.RESET = 0;/清標(biāo)志GpioDataRegs.GPA