[参考译文] TMS320F28069：测量 ADC 值

我每次都遇到这个错误。

//###########################################################################
//
// FILE:   Example_2806xAdcSoc.c
//
// TITLE:  ADC Start of Conversion Example
//
//! \addtogroup f2806x_example_list
//! <h1> ADC Start of Conversion (adc_soc)</h1>
//! 
//! This ADC example uses ePWM1 to generate a periodic ADC SOC - ADCINT1.
//! Two channels are converted, ADCINA4 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:
// Copyright (C) 2009-2023 Texas Instruments Incorporated - http://www.ti.com/
//
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// modification, are permitted provided that the following conditions 
// are met:
// 
//   Redistributions of source code must retain the above copyright 
//   notice, this list of conditions and the following disclaimer.
// 
//   Redistributions in binary form must reproduce the above copyright
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// 
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
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// $
//###########################################################################

//
// Included Files
//
#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File

//
// Function Prototypes
//
__interrupt void adc_isr(void);
void Adc_Config(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 F2806x_SysCtrl.c file.
    //
    InitSysCtrl();

    //
    // Step 2. Initialize GPIO:
    // This example function is found in the F2806x_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 F2806x_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 F2806x_DefaultIsr.c.
    // This function is found in F2806x_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; //interrupt service request
    EDIS;    // This is needed to disable write to EALLOW protected registers

    //
    // Step 4. Initialize all the Device Peripherals:
    // This function is found in F2806x_InitPeripherals.c
    // InitPeripherals(); // Not required for this example
    //
    InitAdc();  // For this example, init the ADC
    AdcOffsetSelfCal();//ADC Zero Offset Calibration

    //
    // Step 5. 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;

    //
    // Configure ADC
    //
    EALLOW;
    AdcRegs.ADCCTL2.bit.ADCNONOVERLAP = 1; // Enable non-overlap mode - overlap sample is not allowed
    
    //
    // ADCINT1 trips after AdcResults latch
    //
    AdcRegs.ADCCTL1.bit.INTPULSEPOS	= 1; // INt Pulse generation occurs 1 cycle prior to ADC result latching into its result register
    
    AdcRegs.INTSEL1N2.bit.INT1E     = 1;  // Enabled ADCINT1
    AdcRegs.INTSEL1N2.bit.INT1CONT  = 0;  // Disable ADCINT1 Continuous mode
    
    //
    // setup EOC1 to trigger ADCINT1 to fire
    //
    AdcRegs.INTSEL1N2.bit.INT1SEL 	= 1;
    
    AdcRegs.ADCSOC0CTL.bit.CHSEL 	= 4;  // set SOC0 channel select to ADCINA4
    AdcRegs.ADCSOC1CTL.bit.CHSEL 	= 2;  // set SOC1 channel select to ADCINA2
    
    //
    // set SOC0 start trigger on EPWM1A, due to round-robin SOC0 converts
    // first then SOC1
    //
    AdcRegs.ADCSOC0CTL.bit.TRIGSEL 	= 5;
    
    //
    // set SOC1 start trigger on EPWM1A, due to round-robin SOC0 converts 
    // first then SOC1
    //
    AdcRegs.ADCSOC1CTL.bit.TRIGSEL 	= 5;
    
    //
    // set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    //
    AdcRegs.ADCSOC0CTL.bit.ACQPS 	= 6;
    
    //
    // set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
    //    
    AdcRegs.ADCSOC1CTL.bit.ACQPS 	= 6;
    EDIS;

    //
    // 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 CMPA 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] = AdcResult.ADCRESULT0;
    Voltage2[ConversionCount] = AdcResult.ADCRESULT1;
    
    //
    // If 20 conversions have been logged, start over
    //
    if(ConversionCount == 9)
    {
        ConversionCount = 0;
    }
    else
    {
        ConversionCount++;
    }

    //
    // Clear ADCINT1 flag reinitialize for next SOC
    //
    AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1;
    
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;   // Acknowledge interrupt to PIE

    return;
}

//
// End of File
//

1.您好。 上面是我用于测试的代码。 我使用了 TMS320F28069 开发板、并为 ADCINA4和 ADCINA2引脚提供3.3V 和0V 电压。 我使用开发板中的3.3V 引脚提供3.3V 电压、并通过接地端提供0V 电压。 我使用跳线连接了这些引脚。 然后构建和调试上述示例、并使用实时表达式查看 Voltage1和 Voltage2的值。 但根据计算、0V 的预期值为0、3.3V 的预期值为4095。 但我没有在实时表达式中观察到这些值。 我需要首先解决该误差。

2.然后我需要更改上述代码以显示 ADCINB1的输出，即上述 MCU 中的29个引脚。  

你好，Omer，感谢你的支持。 当我将 ACQPS 更改为25时、它会按预期工作。 非常感谢。