Hi
I am using f28335 DSp (www.ti.com/.../. I am trying to do Analog to Digital conversion.
I tried few examples in controlsuite like ADCSOC but couldn't understand the output pins of the digital signal. The input signal is a sinosoidal wave with some offset such that the the signal would be in 0-3V range.
I have connected the signal genertor output to the pin ADCA1 and ADCA2 but don't know on which pin I will receive a digital output. I shall be thankful for the guidance and help.
Code-
//###########################################################################
//
// FILE: Example_2833xAdcSoc.c
//
// TITLE: ADC Start of Conversion Example
//
//! \addtogroup f2833x_example_list
//! <h1> ADC Start of Conversion (adc_soc)</h1>
//!
//! This ADC example uses ePWM1 to generate a periodic ADC SOC on SEQ1.
//! Two channels are converted, ADCINA3 and ADCINA2.
//!
//! \b Watch \b Variables \n
//! - Voltage1[10] - Last 10 ADCRESULT0 values
//! - Voltage2[10] - Last 10 ADCRESULT1 values
//! - ConversionCount - Current result number 0-9
//! - LoopCount - Idle loop counter
//
//###########################################################################
// $TI Release: $
// $Release Date: $
// $Copyright:
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//
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//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
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// $
//###########################################################################
//
// Included Files
//
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
//
// Function Prototypes
//
__interrupt void adc_isr(void);
//
// Globals
//
Uint16 LoopCount;
Uint16 ConversionCount;
Uint16 Voltage1[10];
Uint16 Voltage2[10];
//
// Main
//
void main(void)
{
//
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.
//
InitSysCtrl();
EALLOW;
#if (CPU_FRQ_150MHZ) // Default - 150 MHz SYSCLKOUT
//
// HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz
//
#define ADC_MODCLK 0x3
#endif
#if (CPU_FRQ_100MHZ)
//
// HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 100/(2*2) = 25.0 MHz
//
#define ADC_MODCLK 0x2
#endif
EDIS;
//
// Define ADCCLK clock frequency ( less than or equal to 25 MHz )
// Assuming InitSysCtrl() has set SYSCLKOUT to 150 MHz
//
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK;
EDIS;
//
// Step 2. Initialize GPIO:
// This example function is found in the DSP2833x_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 DSP2833x_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 DSP2833x_DefaultIsr.c.
// This function is found in DSP2833x_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.ADCINT = &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 DSP2833x_InitPeripherals.c
//
// InitPeripherals(); // Not required for this example
InitAdc(); // For this example, init the ADC
//
// Step 5. User specific code, enable interrupts:
//
//
// Enable ADCINT in PIE
//
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
LoopCount = 0;
ConversionCount = 0;
//
// Configure ADC
//
AdcRegs.ADCMAXCONV.all = 0x0001; // Setup 2 conv's on SEQ1
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x3; // Setup ADCINA3 as 1st SEQ1 conv.
AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x2; // Setup ADCINA2 as 2nd SEQ1 conv.
//
// Enable SOCA from ePWM to start SEQ1
//
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
//
// 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
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
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
//
// Wait for ADC interrupt
//
for(;;)
{
LoopCount++;
}
}
//
// adc_isr -
//
__interrupt void
adc_isr(void)
{
Voltage1[ConversionCount] = AdcRegs.ADCRESULT0 >>4;
Voltage2[ConversionCount] = AdcRegs.ADCRESULT1 >>4;
//
// If 40 conversions have been logged, start over
//
if(ConversionCount == 9)
{
ConversionCount = 0;
}
else
{
ConversionCount++;
}
//
// Reinitialize for next ADC sequence
//
AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1; // Reset SEQ1
AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1; // Clear INT SEQ1 bit
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; // Acknowledge interrupt to PIE
return;
}
//
// End of File
//
