[参考译文] MSP430FR6989：ADC 问题

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请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1375249/msp430fr6989-adc-problem

器件型号：MSP430FR6989

工具与软件：

您好！

我使用 MSP430FR6989开发板。我设置了 P9.0至 P9.7的引脚、并且我想通过使用中断来获取这些值。即使在调试时分别连接了引脚 GND 和3V3电压引脚、我得到的结果也介于700和890之间。任何引脚上都没有变化。我在这里共享测试代码。我曾尝试更改基准电压(例如内部1.2V 或2V)、但仍未获得逻辑结果。任何帮助都将受到赞赏。

此致。

#include <msp430.h>
#include <stdint.h>

volatile uint16_t adc_values[8]; 
volatile uint8_t adc_index = 0;  

void led_config();
void led_on();
void led_off();


void main(void) {
    WDTCTL = WDTPW + WDTHOLD;
    PM5CTL0 &= ~LOCKLPM5;


    ADC12CTL0 = ADC12SHT0_3 | ADC12ON;
    ADC12CTL1 = ADC12SHP | ADC12CONSEQ_1;   
    ADC12CTL2 = ADC12RES_2; 
    ADC12MCTL0 |= ADC12INCH_0 | ADC12VRSEL_0; 
    ADC12MCTL1 |= ADC12INCH_1 | ADC12VRSEL_0; 
    ADC12MCTL2 |= ADC12INCH_2 | ADC12VRSEL_0; 
    ADC12MCTL3 |= ADC12INCH_3 | ADC12VRSEL_0; 
    ADC12MCTL4 |= ADC12INCH_4 | ADC12VRSEL_0; 
    ADC12MCTL5 |= ADC12INCH_5 | ADC12VRSEL_0;
    ADC12MCTL6 |= ADC12INCH_6 | ADC12VRSEL_0;
    ADC12MCTL7 |= ADC12INCH_7 | ADC12VRSEL_0; 

    P9SEL0 |= 0xFF;
    P9SEL1 |= 0xFF;

    ADC12IER0 |= ADC12IE0 | ADC12IE1 | ADC12IE2 | ADC12IE3 | ADC12IE4 | ADC12IE5 | ADC12IE6 | ADC12IE7 ;

    while(1) {

        ADC12CTL0 |= ADC12SC | ADC12ENC;   // ADC örnekleme ve dönüşümü başlat
        __delay_cycles(2000);
       __bis_SR_register(GIE);

    }
}




#pragma vector=ADC12_VECTOR
__interrupt void ADC_ISR(void) {
    switch(__even_in_range(ADC12IV, ADC12IV_ADC12RDYIFG))
    {
        case ADC12IV_ADC12IFG0:
            adc_values[0] = ADC12MEM0;
            break;
        case ADC12IV_ADC12IFG1:
            adc_values[1] = ADC12MEM1;
            break;
        case ADC12IV_ADC12IFG2:
            adc_values[2] = ADC12MEM2;
            break;
        case ADC12IV_ADC12IFG3:
            adc_values[3] = ADC12MEM3;
            break;
        case ADC12IV_ADC12IFG4:
            adc_values[4] = ADC12MEM4;
            break;
        case ADC12IV_ADC12IFG5:
            adc_values[5] = ADC12MEM5;
            break;
        case ADC12IV_ADC12IFG6:
            adc_values[6] = ADC12MEM6;
            break;
        case ADC12IV_ADC12IFG7:
            adc_values[7] = ADC12MEM7;
            break;

    }
}

4 个月前

0 admin 4 个月前

TI__Guru**** 1624230 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

您在检查前运行了多长时间？

1) 1)如果 ADC12MSC = 0、则每个 ADC12SC 触发器只能得到一个转换。

2) 2)在 ADC12MCTL7：ADC12EOS=0时、它将在循环返回到 ADC12MCTL0之前循环遍历所有32个通道。

3) 3) ADC12MEMn 寄存器在复位后未定义；然后我经常看到它们的随机数。

我怀疑您想要：

> ADC12CTL0 = ADC12SHT0_3 | ADC12ON | ADC12MSC； // CONSEQ=1 in a burst

和

> ADC12MCTL7 |= ADC12INCH_7 | ADC12VRSEL_0 | ADC12EOS；//突发的最终通道

0 admin 4 个月前

TI__Guru**** 1624230 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

您好！

感谢您的快速回复。我不确定调试时的运行时间有多长、但我想已经足够了。我无法理解你说的 ADC12MEMn 寄存器未定义是什么意思。您能详细解释一下吗？最好在代码片段中引用它。

我降低了采样时间速率、并将通道7设置为最后一个转换通道。我还添加了 ADC12MSC 寄存器、用于进行更多转换。我仍然获得相同的结果。

您可以检查下面的更新。

此致。

#include <msp430.h>
#include <stdint.h>

volatile uint16_t adc_values[8]; 
volatile uint8_t adc_index = 0;  

void led_config();
void led_on();
void led_off();


void main(void) {
    WDTCTL = WDTPW + WDTHOLD;
    PM5CTL0 &= ~LOCKLPM5;


    ADC12CTL0 = ADC12SHT0_2 | ADC12MSC | ADC12ON;
    ADC12CTL1 = ADC12SHP | ADC12CONSEQ_1;   
    ADC12CTL2 = ADC12RES_2;
    ADC12CTL3 = ADC12CSTARTADD_0;
    ADC12MCTL0 |= ADC12INCH_0 | ADC12VRSEL_0; 
    ADC12MCTL1 |= ADC12INCH_1 | ADC12VRSEL_0; 
    ADC12MCTL2 |= ADC12INCH_2 | ADC12VRSEL_0; 
    ADC12MCTL3 |= ADC12INCH_3 | ADC12VRSEL_0; 
    ADC12MCTL4 |= ADC12INCH_4 | ADC12VRSEL_0; 
    ADC12MCTL5 |= ADC12INCH_5 | ADC12VRSEL_0;
    ADC12MCTL6 |= ADC12INCH_6 | ADC12VRSEL_0;
    ADC12MCTL7 |= ADC12INCH_7 | ADC12VRSEL_0 | ADC12EOS; 

    P9SEL0 |= 0xFF;
    P9SEL1 |= 0xFF;

    ADC12IER0 |= ADC12IE0 | ADC12IE1 | ADC12IE2 | ADC12IE3 | ADC12IE4 | ADC12IE5 | ADC12IE6 | ADC12IE7 ;
    ADC12CTL0 |= ADC12ENC;
    
    while(1) {

        ADC12CTL0 |= ADC12SC | ADC12ENC;   // ADC örnekleme ve dönüşümü başlat
        __delay_cycles(2000);
       __bis_SR_register(GIE);

    }
}




#pragma vector=ADC12_VECTOR
__interrupt void ADC_ISR(void) {
    switch(__even_in_range(ADC12IV, ADC12IV_ADC12RDYIFG))
    {
        case ADC12IV_ADC12IFG0:
            adc_values[0] = ADC12MEM0;
            break;
        case ADC12IV_ADC12IFG1:
            adc_values[1] = ADC12MEM1;
            break;
        case ADC12IV_ADC12IFG2:
            adc_values[2] = ADC12MEM2;
            break;
        case ADC12IV_ADC12IFG3:
            adc_values[3] = ADC12MEM3;
            break;
        case ADC12IV_ADC12IFG4:
            adc_values[4] = ADC12MEM4;
            break;
        case ADC12IV_ADC12IFG5:
            adc_values[5] = ADC12MEM5;
            break;
        case ADC12IV_ADC12IFG6:
            adc_values[6] = ADC12MEM6;
            break;
        case ADC12IV_ADC12IFG7:
            adc_values[7] = ADC12MEM7;
            break;

    }
}

0 admin 4 个月前

TI__Guru**** 1624230 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

使用 INCH_0到 INCH_7选择 A0到 A7。您将端口9设置为 ADC 功能、但这些引脚连接到 A8和 A15。

通常、当我使用 ADC 中断时、我仅为序列中的最后一个启用中断。数据仍将在 ADC12MEMx 寄存器中、并且浪费的中断进入和退出时间更少。

抛弃 delay_cycles、启用低功耗模式、并在 ISR 中退出低功耗模式。您不必计算周期数即可确保2000个周期足以供 ADC 转换8个通道。

0 admin 4 个月前

TI__Guru**** 1624230 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

您好！

感谢您的答复。我错过了该端口号的内容。如您所说、它可以连接到 A8和 A15、最终我能够测量逻辑方面的内容。它根据 ADC12VRSEL_0 (即3V3)进行工作。但是、我想测量2V 的内部基准电压。以下是我的代码。

能否分享一下有关使用内部基准电压的知识？

提前感谢。

#include <msp430.h>
#include <stdint.h>

volatile uint16_t adc_values[8]; // ADC değerlerini saklayacak dizi
volatile uint8_t adc_index = 0;  // ADC dizisi indeksi


void main(void) {

    WDTCTL = WDTPW + WDTHOLD;
    PM5CTL0 &= ~LOCKLPM5;

    P9SEL0 |= 0xFF;
    P9SEL1 |= 0xFF;


    ADC12CTL0 = ADC12SHT0_2 | ADC12MSC | ADC12ON; 
    ADC12CTL1 = ADC12SHP | ADC12CONSEQ_1;                     
    ADC12CTL2 = ADC12RES_2; 
    ADC12CTL3 = ADC12CSTARTADD_0;
    ADC12MCTL0 |= ADC12INCH_8 ; // A1 ADC input select; Vref=AVCC
    ADC12MCTL1 |= ADC12INCH_9 ; // A1 ADC input select; Vref=AVCC
    ADC12MCTL2 |= ADC12INCH_10 ; // A1 ADC input select; Vref=AVCC
    ADC12MCTL3 |= ADC12INCH_11 ; // A1 ADC input select; Vref=AVCC
    ADC12MCTL4 |= ADC12INCH_12 ; // A1 ADC input select; Vref=AVCC
    ADC12MCTL5 |= ADC12INCH_13 ;// A1 ADC input select; Vref=AVCC
    ADC12MCTL6 |= ADC12INCH_14 ; // A1 ADC input select; Vref=AVCC
    ADC12MCTL7 |= ADC12INCH_15 | ADC12EOS; // A1 ADC input select; Vref=AVCC


    while(REFCTL0 &REFGENBUSY);
    REFCTL0 |= REFVSEL_1 | REFON;
    while(!(REFCTL0 &REFGENRDY));

    ADC12IER0 |= ADC12IE7;
    
    ADC12CTL0 |= ADC12ENC;


    while(1) {
        ADC12CTL0 |= ADC12SC | ADC12ENC;   // ADC örnekleme ve dönüşümü başlat
       __bis_SR_register(LPM0_bits | GIE);

    }
}




#pragma vector=ADC12_VECTOR
__interrupt void ADC_ISR(void) {
    switch(__even_in_range(ADC12IV, ADC12IV_ADC12RDYIFG))
    {

        case ADC12IV_ADC12IFG7:
            adc_values[0] = ADC12MEM0;
            adc_values[1] = ADC12MEM1;
            adc_values[2] = ADC12MEM2;
            adc_values[3] = ADC12MEM3;
            adc_values[4] = ADC12MEM4;
            adc_values[5] = ADC12MEM5;
            adc_values[6] = ADC12MEM6;
            adc_values[7] = ADC12MEM7;
            __bic_SR_register_on_exit(LPM0_bits);
            break;

    }

}

0 admin 4 个月前

TI__Guru**** 1624230 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

您好！

我添加了电压基准选择、它很有效。这是代码的最后一个版本。

感谢您的帮助。

#include <msp430.h>
#include <stdint.h>

volatile uint16_t adc_values[8]; // ADC değerlerini saklayacak dizi
volatile uint8_t adc_index = 0;  // ADC dizisi indeksi


void main(void) {

    WDTCTL = WDTPW + WDTHOLD;
    PM5CTL0 &= ~LOCKLPM5;

    P9SEL0 |= 0xFF;
    P9SEL1 |= 0xFF;


    ADC12CTL0 = ADC12SHT0_2 | ADC12MSC | ADC12ON; 
    ADC12CTL1 = ADC12SHP | ADC12CONSEQ_1;                     
    ADC12CTL2 = ADC12RES_2; 
    ADC12CTL3 = ADC12CSTARTADD_0;
    ADC12MCTL0 |= ADC12INCH_8 | ADC12VRSEL_1 ; 
    ADC12MCTL1 |= ADC12INCH_9 | ADC12VRSEL_1; 
    ADC12MCTL2 |= ADC12INCH_10 | ADC12VRSEL_1 ; 
    ADC12MCTL3 |= ADC12INCH_11 | ADC12VRSEL_1 ;
    ADC12MCTL4 |= ADC12INCH_12 | ADC12VRSEL_1 ; 
    ADC12MCTL5 |= ADC12INCH_13 | ADC12VRSEL_1 ;
    ADC12MCTL6 |= ADC12INCH_14 | ADC12VRSEL_1 ;
    ADC12MCTL7 |= ADC12INCH_15 | ADC12VRSEL_1 | ADC12EOS; 


    while(REFCTL0 &REFGENBUSY);
    REFCTL0 |= REFVSEL_1 | REFON;
    while(!(REFCTL0 &REFGENRDY));

    ADC12IER0 |= ADC12IE7;
    
    ADC12CTL0 |= ADC12ENC;


    while(1) {
        ADC12CTL0 |= ADC12SC | ADC12ENC;   // ADC örnekleme ve dönüşümü başlat
       __bis_SR_register(LPM0_bits | GIE);

    }
}




#pragma vector=ADC12_VECTOR
__interrupt void ADC_ISR(void) {
    switch(__even_in_range(ADC12IV, ADC12IV_ADC12RDYIFG))
    {

        case ADC12IV_ADC12IFG7:
            adc_values[0] = ADC12MEM0;
            adc_values[1] = ADC12MEM1;
            adc_values[2] = ADC12MEM2;
            adc_values[3] = ADC12MEM3;
            adc_values[4] = ADC12MEM4;
            adc_values[5] = ADC12MEM5;
            adc_values[6] = ADC12MEM6;
            adc_values[7] = ADC12MEM7;
            __bic_SR_register_on_exit(LPM0_bits);
            break;

    }

}

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[参考译文] MSP430FR6989：ADC 问题