void main()
{
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2803x_SysCtrl.c file.
InitSysCtrl();
// Step 2. Initialize GPIO:
// This example function is found in the DSP2803x_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 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 DSP2803x_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 DSP2803x_DefaultIsr.c.
// This function is found in DSP2803x_PieVect.c.
InitPieVectTable();
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT1 = &adc_isr;
EDIS; // This is needed to disable write to EALLOW protected registers
// Step 4. Initialize the ADC:
// This function is found in DSP2803x_Adc.c
InitAdc(); // For this example, init the ADC
// Step 5. Configure ADC to sample the temperature sensor on ADCIN5:
// The output of Piccolo temperature sensor can be internally connected to the ADC through ADCINA5
// via the TEMPCONV bit in the ADCCTL1 register. When this bit is set, any voltage applied to the external
// ADCIN5 pin is ignored.
EALLOW;
AdcRegs.ADCCTL1.bit.TEMPCONV = 1; //Connect internal temp sensor to channel ADCINA5.
EDIS;
// Step 6. Continue configuring ADC to sample the temperature sensor on ADCIN5:
// Since the temperature sensor is connected to ADCIN5, configure the ADC to sample channel ADCIN5
// as well as the ADC SOC trigger and ADCINTs preferred. This example uses EPWM1A to trigger the ADC
// to start a conversion and trips ADCINT1 at the end of the conversion.
EALLOW;
AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1; //ADCINT1 trips after AdcResults latch
//ADCCTL1:ADC控制寄存器1
//(15)RESET:写1复位ADC模块
//(14)ADCENABLE:ADC模块允许（写0禁止但不断电ADC，写1允许ADC转换）
//(13)ADCBSY:为1说明ADC忙
//(12~8)ADCBSYCHN:用来确定ADC当前正在转换的通道
//(7)ADCPWDN:为0时ADC时钟除bandgap&referencce全部断电
//(6)ADCBGPWD:为0：bandgap断电
//(5)ADCREFPWD,为0：Reference buffers断电
//(3)ADCREFSEL:内外部参考选择，为0为内部参考
//(2)INTPULSEPOS:中断何时产生（为0 ：ADC开始转换时产生，为1：ADC转换完之前1个时钟周期产生）
//(1)VREFLOCONV：为1内部VREFLO连接到ADCINB5
//(0)TEMPCONV:为1内部温度传感器接到ADCINA5
AdcRegs.INTSEL1N2.bit.INT1E = 1; //Enabled ADCINT1
AdcRegs.INTSEL1N2.bit.INT1CONT = 0; //Disable ADCINT1 Continuous mode
AdcRegs.INTSEL1N2.bit.INT1SEL = 0; //setup EOC0 to trigger ADCINT1 to fire
//INTSELxNy:ADC中断来源选择寄存器
//(14)INTyCONT:中断脉冲产生设置（为0：除非ADCINTy flag清零ADCINTy产生中断；为1：只要有EOC信号就中断）
//(13)INTyE：INTy中断允许（为1允许）
//(12~8)INTySEL:ADCINTy的EOC信号来源
//(6)INTxCONT:中断脉冲产生设置（为0：除非ADCINTx flag清零ADCINTx产生中断；为1：只要有EOC信号就中断）
//(5)INTxE：INTx中断允许（为1允许）
//(4~0)INTxSEL:ADCINTx的EOC信号来源
AdcRegs.ADCSOC0CTL.bit.CHSEL = 5; //set SOC0 channel select to ADCINA5 (which is internally connected to the temperature sensor)
AdcRegs.ADCSOC0CTL.bit.TRIGSEL = 5; //set SOC0 start trigger on EPWM1A
AdcRegs.ADCSOC0CTL.bit.ACQPS = 6; //set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
//ADCSOCxCTL:ADCSOC0 - SOC15控制寄存器
//(15~11)TRIGSEL:SOC产生来源(软件，CPUtimer中断，PWM，XINT）
//(9~6)CHSEL:当SOCx产生的时候ADC转换通道选择（SIMULENx=0时单通道选择，SIMULENx = 1时，两对通道选择)
//(5~0)ACQPS:SOCx的采样保持窗口大小。（06h Sample window is 7 cycles long (6 + 1 clock cycles).）
EDIS;
// Step 7. User specific code, enable interrupts:
// Enable ADCINT1 in PIE
PieCtrlRegs.PIEIER1.bit.INTx1 = 1; // Enable INT 1.1 in the PIE
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
LoopCount = 0;
ConversionCount = 0;
// Assumes ePWM1 clock is already enabled in InitSysCtrl();
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
//ETSEL:事件触发选择寄存器
//(15)SOCBEN:SOCB允许（为1：允许ADC在SOC脉冲来临时转换）
//(14~12)SOCBSEL:EPWMxSOCB来源选择（DCBEVT1,TBCTR = 0x0000,TBCTR = TBPRD,equal to CMPA,equal to CMPB)
//(11)SOCAEN:SOCA允许（为1：允许ADC在SOC脉冲来临时转换）
//(10-8)SOCASEL:EPWMxSOCA来源选择（DCBEVT1,TBCTR = 0x0000,TBCTR = TBPRD,equal to CMPA,equal to CMPB)
//(3)INTEN:EPWMx_INT中断产生允许（为1：允许）
//(2~0)INTSEL:EPWMx_INT中断来源选择（TBCTR = 0x0000,TBCTR = TBPRD,equal to CMPA,equal to CMPB)
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
//ETPS:时间产生预分频寄存器
//(15~14)SOCBCNT:计数有多少次SOCB事件（一到3次）
//(13~12)SOCBPRD:设定多少次SOCB事件产生一个SOCB的脉冲
//(11~10)SOCACNT:计数有多少次SOCA事件（一到3次）
//(9~8)SOCAPRD:设定多少次SOCA事件产生一个SOCB的脉冲
//(3~2)INTCNT:计数有多少次EPWMx_INT中断事件（一到3次）
//(1~0)INTPRD:设定多少次EPWMx_INT事件产生中断
EPwm1Regs.CMPA.half.CMPA = 0x0080; // Set compare A value
EPwm1Regs.TBPRD = 0xFFFF; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
//TBCTL:时间基准控制寄存器
//(15~14)FREE, SOFT:00仿真时立即停止，01完成当前周期时停止，10Free Run
//(13)PHSDIR:方向选址寄存器（为1，同步后上升计数，为0，同步后下降计数）
//（12~10）CLKDIV：分频寄存器TBCLK = SYSCLKOUT / (HSPCLKDIV × CLKDIV)（000 /1,001 /2,010 /4,011 /8,100 /16,101 /32,110 /64,111 /128)
//(9~7)HSPCLKDIV:分频寄存器TBCLK = SYSCLKOUT / (HSPCLKDIV × CLKDIV)（000 /1,001 /2,010 /4,011 /8,100 /16,101 /32,110 /64,111 /128)
//(6)SWFSYNC:软件写1同步（写一同步，仅在SYNCOSEL = 00时有效）
//(5~4)SYNCOSEL:同步输出信号产生来源（00 EPWMxSYNC,01 CTR = zero,10 CTR = CMPB ,11 Disable EPWMxSYNCO signal)
//(3)PRDLD:周期寄存器何时从shadow读取（为0：TBCTR=0时，为1：不使用shadow即立即读取）
//(2)PHSEN:是否允许同步时TBCTR=TBPHS（0不允许，1允许）
//(1~0)CTRMODE:计数方向（00上升，01下降，10上升下降，11冻结）
// Wait for ADC interrupt
for(;;)
{
LoopCount++;
}
}
interrupt void adc_isr(void)
{
TempSensorVoltage[ConversionCount] = AdcResult.ADCRESULT0;
// If 20 conversions have been logged, start over
if(ConversionCount == 9)
{
ConversionCount = 0;
}
else ConversionCount++;
AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //Clear ADCINT1 flag reinitialize for next SOC
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; // Acknowledge interrupt to PIE
return;
}
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