I am a beginner for microcontroller. In F28027 MCU, I wanted ADC A7 to sample input voltage for every one second timed by CPU Timer 0. Works fine in debug mode.
But in program mode, the value in watch window does not change when I change the input voltage. Please help me.
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
// Prototype statements for functions found within this file.
interrupt void adc_isr(void);
void Adc_Config(void);
// Global variables used in this example:
volatile uint16_t Voltage;
main()
{
// WARNING: Always ensure you call memcpy before running any functions from RAM
// InitSysCtrl includes a call to a RAM based function and without a call to
// memcpy first, the processor will go "into the weeds"
#ifdef _FLASH
memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
#endif
// 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 f2802x_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 f2802x_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 f2802x_DefaultIsr.c.
// This function is found in f2802x_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 all the Device Peripherals:
// This function is found in f2802x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
ConfigCpuTimer(&CpuTimer0, 60, 1000000);
InitAdc(); // For this example, init the ADC
// Step 5. User specific code, enable interrupts:
// Enable ADCINT1 & CPUTIMER0 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
// Configure ADC
//Note: Channel ADCINA4 will be double sampled to workaround the ADC 1st sample issue for rev0 silicon errata
EALLOW;
AdcRegs.SOCPRICTL.bit.SOCPRIORITY = 0; // SOC Priority is handled in round robin mode
AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1; //ADCINT1 trips after AdcResults latch
AdcRegs.INTSEL1N2.bit.INT1E = 1; //Enabled ADCINT1
AdcRegs.INTSEL1N2.bit.INT1CONT = 0; //Disable ADCINT1 Continuous mode
AdcRegs.INTSEL1N2.bit.INT1SEL = 8; //setup EOC8 to trigger ADCINT1 to fire
AdcRegs.ADCSOC8CTL.bit.CHSEL = 7; //set SOC8 channel select to ADCINA7
AdcRegs.ADCSOC8CTL.bit.TRIGSEL = 1; //set SOC8 start trigger on CPUTIMER0
AdcRegs.ADCSOC8CTL.bit.ACQPS = 6; //set SOC8 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0;
GpioCtrlRegs.GPBDIR.bit.GPIO34 = 1;
EDIS;
// Wait for ADC interrupt
while(1)
{}
}
interrupt void adc_isr(void)
{
Voltage = AdcResult.ADCRESULT8; //discard ADCRESULT0 as part of the workaround to the 1st sample errata for rev0
GpioDataRegs.GPBTOGGLE.bit.GPIO34 = 1;
AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //Clear ADCINT1 flag reinitialize for next SOC
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; // Acknowledge interrupt to PIE
return;
}
