Part Number: LAUNCHXL-F28379D
Other Parts Discussed in Thread: C2000WARE
Hi,
I tried to implement a simple ADC conversion on F28379D in which SOC is suppose to generate when ePWM2 TBCTR = PRD. ADC result register is read in the main code for test purposes. But it contains the value of zero.
When I tried to read SOCAPRD of ETPS register it didn't update and remains at zero. But I couldn't find any error with my code. Following is the main code of mine,
#include "Lab.h" // Main include file
//--- Global Variables
Uint16 DEBUG_TOGGLE = 1; // Used for realtime mode investigation test
Uint16 SINE_ENABLE = 0; // Used for DAC waveform generation
Uint16 PWM_MODULATE = 0; // Used for PWM modulation
Uint16 AdcBuf[ADC_BUF_LEN]; // ADC buffer allocation
Uint16 DacOffset; // DAC offset
Uint16 DacOutput; // DAC output
Uint32 PwmDuty; // measured PWM duty cycle
Uint32 PwmPeriod; // measured PWM period
int whilecount =0;
float ind_current=0;
void main(void)
{
//--- CPU Initialization
InitSysCtrl(); // Initialize the CPU (FILE: SysCtrl.c)
InitGpio(); // Initialize the shared GPIO pins (FILE: Gpio.c)
InitXbar(); // Initialize the input, output & ePWM X-Bar (FILE: Xbar.c)
InitPieCtrl(); // Initialize and enable the PIE (FILE: PieCtrl.c)
InitWatchdog(); // Initialize the Watchdog Timer (FILE: WatchDog.c)
//--- Peripheral Initialization
InitAdca(); // Initialize the ADC-A (FILE: Adc.c)
// InitDacb(); // Initialize the DAC-B (File: Dac.c)
InitEPwm(); // Initialize the EPwm (FILE: EPwm.c)
// Initialize the ECap (FILE: ECap.c)
GpioDataRegs.GPACLEAR.bit.GPIO2 = 0x1; //Turn off IGBT S3
GpioDataRegs.GPACLEAR.bit.GPIO3 = 0x1; //Turn off IGBT S2
GpioDataRegs.GPACLEAR.bit.GPIO5 = 0x1; //Turn off IGBT S1
GpioDataRegs.GPACLEAR.bit.GPIO7 = 0x1; //Turn off IGBT S4
GpioDataRegs.GPACLEAR.bit.GPIO6 = 0x1; //Turn off IGBT DC bus
GpioDataRegs.GPACLEAR.bit.GPIO4 = 0x1; //Turn off the reserved gate
GpioDataRegs.GPACLEAR.bit.GPIO6 = 0x1; //Turn off IGBT DC bus
//--- Enable global interrupts
// asm(" CLRC INTM, DBGM"); // Enable global interrupts and realtime debug
//--- Main Loop
while(1) // endless loop - wait for an interrupt
{
whilecount++;
ind_current=(3/4096)*AdcbResultRegs.ADCRESULT2;
asm(" NOP");
}
} //end of main()
ADC.c file of mine is as follows,
#include "Lab.h" // Main include file
/**********************************************************************
* Function: InitAdca()
*
* Description: Initializes ADC-A on the F28x7x
**********************************************************************/
void InitAdca(void)
{
asm(" EALLOW"); // Enable EALLOW protected register access
//--- Reset the ADC.
DevCfgRegs.SOFTPRES13.bit.ADC_A = 1; // ADC is reset
DevCfgRegs.SOFTPRES13.bit.ADC_A = 0; // ADC is released from reset
DevCfgRegs.SOFTPRES13.bit.ADC_B = 1; // ADC is reset
DevCfgRegs.SOFTPRES13.bit.ADC_B = 0; // ADC is released from reset
DevCfgRegs.SOFTPRES13.bit.ADC_C = 1; // ADC is reset
DevCfgRegs.SOFTPRES13.bit.ADC_C = 0; // ADC is released from reset
//--- Configure the ADC 'B' base registers
AdcbRegs.ADCCTL1.all = 0x0004; // Main ADC configuration
AdcbRegs.ADCCTL2.all = 0x0006; // ADC clock configuration
AdcbRegs.ADCBURSTCTL.all = 0x0000;
AdcSetMode(ADC_ADCB, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE);
//--- SOC0 configuration
AdcbRegs.ADCSOC0CTL.bit.TRIGSEL = 0x7; // Trigger using ePWM2-ADCSOCA
AdcbRegs.ADCSOC0CTL.bit.CHSEL = 0x2; // Convert channel ADCINB2 (Main current sensor)
AdcbRegs.ADCSOC0CTL.bit.ACQPS = 19; // Acquisition window set to (19+1)=20 cycles (100 ns with 200 MHz SYSCLK)
AdcbRegs.ADCINTSOCSEL1.bit.SOC0 = 0; // No ADCINT will trigger SOC0
AdcbRegs.ADCSOCPRICTL.bit.SOCPRIORITY = 0; // All SOCs handled in round-robin mode
//--- ADCb interrupt configuration
AdcbRegs.ADCINTSEL1N2.bit.INT1CONT = 1; // Interrupt pulses regardless of flag state
AdcbRegs.ADCINTSEL1N2.bit.INT1E = 0; // Enable the interrupt in the ADC
AdcbRegs.ADCINTSEL1N2.bit.INT1SEL = 0; // EOC0 triggers the interrupt
//--- Enable the ADC interrupt
PieCtrlRegs.PIEIER1.bit.INTx1 = 0; // Disable ADCA1 interrupt in PIE group 1
IER |= 0x0000; // Disable INT1 in IER to enable PIE group
//--- Finish up
// AdcaRegs.ADCCTL1.bit.ADCPWDNZ = 1; // Power up the ADC
// DelayUs(1000);
AdcbRegs.ADCCTL1.bit.ADCPWDNZ = 1;
DelayUs(1000);
// AdccRegs.ADCCTL1.bit.ADCPWDNZ = 1;
// DelayUs(1000); // Wait 1 ms after power-up before using the ADC
asm(" EDIS"); // Disable EALLOW protected register access
} // end InitAdc()
and EPWM.c file is as follows,
#include "Lab.h" // Main include file
/**********************************************************************
* Function: InitEPwm()
*
* Description: Initializes the Enhanced PWM modules on the F28x7x
**********************************************************************/
void InitEPwm(void)
{
asm(" EALLOW"); // Enable EALLOW protected register access
// Configure the prescaler to the ePWM modules. Max ePWM input clock is 100 MHz.
ClkCfgRegs.PERCLKDIVSEL.bit.EPWMCLKDIV = 1; // EPWMCLK divider from PLLSYSCLK. 0=/1, 1=/2
// Must disable the clock to the ePWM modules if you want all ePWM modules synchronized.
CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 0;
asm(" EDIS"); // Disable EALLOW protected register access
//---------------------------------------------------------------------
//--- Configure ePWM2 to trigger ADC SOCA at a 50 kHz rate
//---------------------------------------------------------------------
asm(" EALLOW"); // Enable EALLOW protected register access
DevCfgRegs.SOFTPRES2.bit.EPWM2 = 1; // ePWM2 is reset
DevCfgRegs.SOFTPRES2.bit.EPWM2 = 0; // ePWM2 is released from reset
asm(" EDIS"); // Disable EALLOW protected register access
EPwm2Regs.TBCTL.bit.CTRMODE = 0x3; // Disable the timer
EPwm2Regs.TBCTL.all = 0xC033; // Configure timer control register
// bit 15-14 11: FREE/SOFT, 11 = ignore emulation suspend
// bit 13 0: PHSDIR, 0 = count down after sync event
// bit 12-10 000: CLKDIV, 000 => TBCLK = HSPCLK/1
// bit 9-7 000: HSPCLKDIV, 000 => HSPCLK = EPWMCLK/1
// bit 6 0: SWFSYNC, 0 = no software sync produced
// bit 5-4 11: SYNCOSEL, 11 = sync-out disabled
// bit 3 0: PRDLD, 0 = reload PRD on counter=0
// bit 2 0: PHSEN, 0 = phase control disabled
// bit 1-0 11: CTRMODE, 11 = timer stopped (disabled)
EPwm2Regs.TBCTR = 0x0000; // Clear timer counter
EPwm2Regs.TBPRD = ADC_SAMPLE_PERIOD; // Set timer period
EPwm2Regs.TBPHS.bit.TBPHS = 0x0000; // Set timer phase
EPwm2Regs.ETPS.all = 0x0100; // Configure SOCA
// bit 15-14 00: EPWMxSOCB, read-only
// bit 13-12 00: SOCBPRD, don't care
// bit 11-10 00: EPWMxSOCA, read-only
// bit 9-8 01: SOCAPRD, 01 = generate SOCA on first event
// bit 7-4 0000: reserved
// bit 3-2 00: INTCNT, don't care
// bit 1-0 00: INTPRD, don't care
EPwm2Regs.ETSEL.all = 0x0A00; // Enable SOCA to ADC
// bit 15 0: SOCBEN, 0 = disable SOCB
// bit 14-12 000: SOCBSEL, don't care
// bit 11 1: SOCAEN, 1 = enable SOCA
// bit 10-8 010: SOCASEL, 010 = SOCA on PRD event
// bit 7-4 0000: reserved
// bit 3 0: INTEN, 0 = disable interrupt
// bit 2-0 000: INTSEL, don't care
EPwm2Regs.TBCTL.bit.CTRMODE = 0x0; // Enable the timer in count up mode
//---------------------------------------------------------------------
//--- Enable the clocks to the ePWM module.
//--- Note: this should be done after all ePWM modules are configured
//--- to ensure synchronization between the ePWM modules.
//---------------------------------------------------------------------
asm(" EALLOW"); // Enable EALLOW protected register access
CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 1; // TBCLK to ePWM modules enabled
asm(" EDIS"); // Disable EALLOW protected register access
} // end InitEPwm()
Please help me to find the error of the above code.
Thanks in advance.
Lahiru
