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// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2802x_SysCtrl.c file. InitSysCtrl();
// Step 2. Initalize GPIO:
// This example function is found in the DSP2802x_Gpio.c file and // illustrates how to set the GPIO to it's default state. // InitGpio(); // Skipped for this example
// Step 3. Clear all interrupts and initialize PIE vector table: // Disable CPU interrupts DINT;
// Initialize 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 DSP2802x_PieCtrl.c file. InitPieCtrl();
// Disable CPU interrupts and clear all CPU interrupt flags: IER = 0x0000; IFR = 0x0000;
// Initialize 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 DSP2802x_DefaultIsr.c. // This function is found in DSP2802x_PieVect.c. InitPieVectTable();
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2802x_InitPeripherals.c // InitPeripherals(); // Not required for this example
// Step 5. User specific code:
InitAdc();
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EALLOW;
AdcRegs.ADCSAMPLEMODE.bit.SIMULEN0 = 1; //同时采样 AdcRegs.ADCSOC0CTL.bit.CHSEL = 4; //soc通道选择 AdcRegs.ADCSOC1CTL.bit.CHSEL = 12;
AdcRegs.ADCSOC0CTL.bit.ACQPS = 6; //采样时间 AdcRegs.ADCSOC1CTL.bit.ACQPS = 6;
AdcRegs.ADCSOC0CTL.bit.TRIGSEL = 1; //soc触发选择,TIM0
AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1; //结果存入寄存器才产生中断
PieVectTable.ADCINT1 = &ADC_convered;
AdcRegs.INTSEL1N2.bit.INT1SEL = 1; //中断线1选择soc1 AdcRegs.INTSEL1N2.bit.INT1CONT = 0;
AdcRegs.INTSEL1N2.bit.INT1E = 1; //中断使能
PieCtrlRegs.PIEIER1.bit.INTx1 = 1; //使能int1.1 EDIS;
/****************设置定时器，用以触发ADC*****************/ CpuTimer0Regs.TPR.bit.TDDR = 59;
CpuTimer0Regs.TPRH.bit.TDDRH = 0; //对输入时钟60分频，60M/60=1M CpuTimer0Regs.PRD.all = 500000;//定时0.5s CpuTimer0Regs.TCR.bit.TRB = 1; //reload CpuTimer0Regs.TCR.bit.TIE = 1; //使能中断 CpuTimer0Regs.TCR.bit.TSS = 0; //开始计数
EALLOW;
PieVectTable.TINT0 = &tim0_isr;
PieCtrlRegs.PIECTRL.bit.ENPIE = 1; //使能PIE PieCtrlRegs.PIEIER1.bit.INTx7 = 1; //使能int1.7 IER |= 0x0001;//使能GROUP1 EINT; EDIS;
LEDs_init(); while(1) { }; }
interrupt void ADC_convered(void) {
146. LED_toggle(LED2);
147. ADCINA4_Voltage_sum += AdcResult.ADCRESULT0; 148. ADCINB4_Voltage_sum += AdcResult.ADCRESULT1; 149. AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; 150. PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; 151. convered_count++;
152. /*********转换16次，取平均值*********/ 153. if(convered_count > 15) 154. {
155. ADCINA4_Voltage = ADCINA4_Voltage_sum >> 4;//相当于除以16 156. ADCINB4_Voltage = ADCINB4_Voltage_sum >> 4; 157. ADCINA4_Voltage_sum = 0; 158. ADCINB4_Voltage_sum = 0; 159. convered_count = 0; 160. } 161. } 162.
163. interrupt void tim0_isr(void) 164. {
165. LED_toggle(LED0);
166. PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; 167. }
168. //=========================================================================== 169. // No more.
170. //=========================================================================== 程序运行结果：