1、#include “DSP2833x_Device.h“ / DSP2833x Headerfile Include File#include “DSP2833x_Examples.h“ / DSP2833x Examples Include File#if (CPU_FRQ_150MHZ) / Default - 150 MHz SYSCLKOUT#define ADC_MODCLK 0x3 / HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz#endif#if (CPU_FRQ_100MHZ)#define ADC_MODCLK
2、 0x2 / HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 100/(2*2) = 25.0 MHz#endif#define ADC_CKPS 0x1 / ADC module clock = HSPCLK/2*ADC_CKPS = 25.0MHz/(1*2) = 12.5MHz#define ADC_SHCLK 0xf / S/H width in ADC module periods = 16 ADC clocks#define AVG 1000 / Average sample limit#define ZOFFSET 0x00 / Average Zero o
3、ffset#define BUF_SIZE 160 / Sample buffer sizeUint16 j = 0,ADC_END = 0; / ADC finish flag#pragma DATA_SECTION(ADC_Result,“DMARAML4“);volatile float ADC_Result160;#pragma DATA_SECTION(DMABuf1,“DMARAML4“);volatile Uint16 DMABuf1160;volatile Uint16 *DMADest;volatile Uint16 *DMASource;interrupt void loc
4、al_DINTCH1_ISR(void);void main(void)Uint16 i;/ Step 1. Initialize System Control:/ PLL, WatchDog, enable Peripheral Clocks/ This example function is found in the DSP2833x_SysCtrl.c file.InitSysCtrl();/ Specific clock setting for this example:EALLOW;SysCtrlRegs.HISPCP.all = ADC_MODCLK; / HSPCLK = SYS
5、CLKOUT/ADC_MODCLKEDIS;/ Step 2. Initialize GPIO:/ This example function is found in the DSP2833x_Gpio.c file and/ illustrates how to set the GPIO to its default state./ InitGpio(); / Skipped for this example/ Step 3. Clear all interrupts and initialize PIE vector table:/ Disable CPU interruptsDINT;/
6、 Initialize the PIE control registers to their default state./ The default state is all PIE interrupts disabled and flags/ are cleared./ This function is found in the DSP2833x_PieCtrl.c file.InitPieCtrl();/ Disable CPU interrupts and clear all CPU interrupt flags:IER = 0x0000;IFR = 0x0000;/ Initiali
7、ze the PIE vector table with pointers to the shell Interrupt/ Service Routines (ISR)./ This will populate the entire table, even if the interrupt/ is not used in this example. This is useful for debug purposes./ The shell ISR routines are found in DSP2833x_DefaultIsr.c./ This function is found in DS
8、P2833x_PieVect.c.InitPieVectTable();/ Interrupts that are used in this example are re-mapped to/ ISR functions found within this file.EALLOW; / Allow access to EALLOW protected registersPieVectTable.DINTCH1= EDIS; / Disable access to EALLOW protected registersIER = M_INT7 ; /Enable INT7 (7.1 DMA Ch1
9、)EnableInterrupts();/ Step 4. Initialize all the Device Peripherals:/ This function is found in DSP2833x_InitPeripherals.c/ InitPeripherals(); / Not required for this exampleInitAdc(); / For this example, init the ADC/ Specific ADC setup for this example:AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;AdcReg
10、s.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; / 0 Non-Cascaded Mode; 1 Cascaded ModeAdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 0x1;AdcRegs.ADCTRL2.bit.RST_SEQ1 = 0x1;AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0;AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1;AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2;AdcReg
11、s.ADCCHSELSEQ1.bit.CONV03 = 0x3;AdcRegs.ADCCHSELSEQ2.bit.CONV04 = 0x4;AdcRegs.ADCCHSELSEQ2.bit.CONV05 = 0x5;AdcRegs.ADCCHSELSEQ2.bit.CONV06 = 0x6;AdcRegs.ADCCHSELSEQ2.bit.CONV07 = 0x7;AdcRegs.ADCCHSELSEQ3.bit.CONV08 = 0x8;AdcRegs.ADCCHSELSEQ3.bit.CONV09 = 0x9;AdcRegs.ADCCHSELSEQ3.bit.CONV10 = 0xA;Ad
12、cRegs.ADCCHSELSEQ3.bit.CONV11 = 0xB;AdcRegs.ADCCHSELSEQ4.bit.CONV12 = 0xC;AdcRegs.ADCCHSELSEQ4.bit.CONV13 = 0xD;AdcRegs.ADCCHSELSEQ4.bit.CONV14 = 0xE;AdcRegs.ADCCHSELSEQ4.bit.CONV15 = 0xF;AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 15; / Set up ADC to perform 4 conversions for every SOC/Step 5. User specific
13、 code, enable interrupts:/ Initialize DMA DMAInitialize();/ Clear Tablefor (i=0; iBUF_SIZE; i+)DMABuf1i = 0xffff;/ Configure DMA ChannelDMADest = /Point DMA destination to the beginning of the arrayDMASource = /Point DMA source to ADC result register baseDMACH1AddrConfig(DMADest,DMASource);DMACH1Bur
14、stConfig(15,1,10);DMACH1TransferConfig(9,-15,(-150 + 1);DMACH1WrapConfig(100,100,100,100); /Dont use wrap functionDMACH1ModeConfig(DMA_SEQ1INT,PERINT_ENABLE,ONESHOT_DISABLE,CONT_DISABLE,SYNC_DISABLE,SYNC_SRC,OVRFLOW_DISABLE,SIXTEEN_BIT,CHINT_END,CHINT_ENABLE); StartDMACH1();/ Start SEQ1AdcRegs.ADCTR
15、L2.bit.SOC_SEQ1 = 0x1;for(i=0;i10;i+)for(j=0;j1000;j+)AdcRegs.ADCTRL2.bit.SOC_SEQ1 = 1; /Normally ADC will be tied to ePWM, or timed routine /For this example will re-start manually / Waiting ADC finishwhile(!ADC_END);/ Translate DMABuf to ADC_Resultfor (i=0; iBUF_SIZE; i+)ADC_Resulti = (float)DMABuf1i * 3.0 / 4096.0;asm (“ ESTOP0“);for(;);/ INT7.1interrupt void local_DINTCH1_ISR(void) / DMA Channel 1/ To receive more interrupts from this PIE group, acknowledge this interrupt PieCtrlRegs.PIEACK.all = PIEACK_GROUP7;ADC_END = 1;
