[参考译文] MSP430FR6043：ADC12_B 和 REF_A 配置

https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1501270/msp430fr6043-adc12_b-and-ref_a-configuration

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我要根据电源状态配置 ADC12_B 和 REF_A 模块。

内部电池模式配置：

void ADC_initInternalMode()
{
    ADC12_B_disableConversions(ADC12_B_BASE, ADC12_B_PREEMPTCONVERSION);
    ADC12_B_disable(ADC12_B_BASE);

    // Disable reference and wait for it to be free
    REFCTL0 &= ~REFON;
    while (REFCTL0 & REFGENBUSY);
    REFCTL0 |= REFVSEL_1 | REFON; // 2.0V internal ref
    while (!(REFCTL0 & REFGENRDY));
    __delay_cycles(75); // Allow settling time

    // ADC hardware setup
    adc_init.clockSourceSelect = ADC12_B_CLOCKSOURCE_ACLK;
    adc_init.clockSourceDivider = ADC12_B_CLOCKDIVIDER_1;
    adc_init.clockSourcePredivider = ADC12_B_CLOCKPREDIVIDER__1;
    adc_init.internalChannelMap = ADC12_B_NOINTCH;
    adc_init.sampleHoldSignalSourceSelect = ADC12_B_SAMPLEHOLDSOURCE_SC;

    // Configure channels: Battery (A8), Valve (A9), External (A14)
    // Memory buffer setup (0 to 2)
    // End-of-sequence marked on last channel

    memory_init1 = (ADC12_B_configureMemoryParam){
        .memoryBufferControlIndex = ADC12_B_MEMORY_0,
        .inputSourceSelect = ADC12_B_INPUT_A8,
        .refVoltageSourceSelect = ADC12_B_VREFPOS_INTBUF_VREFNEG_VSS,
        .endOfSequence = ADC12_B_NOTENDOFSEQUENCE
    };

    memory_init2 = (ADC12_B_configureMemoryParam){
        .memoryBufferControlIndex = ADC12_B_MEMORY_1,
        .inputSourceSelect = ADC12_B_INPUT_A9,
        .refVoltageSourceSelect = ADC12_B_VREFPOS_INTBUF_VREFNEG_VSS,
        .endOfSequence = ADC12_B_NOTENDOFSEQUENCE
    };

    memory_init3 = (ADC12_B_configureMemoryParam){
        .memoryBufferControlIndex = ADC12_B_MEMORY_2,
        .inputSourceSelect = ADC12_B_INPUT_A14,
        .refVoltageSourceSelect = ADC12_B_VREFPOS_INTBUF_VREFNEG_VSS,
        .endOfSequence = ADC12_B_ENDOFSEQUENCE
    };

    ADC12_B_init(ADC12_B_BASE, &adc_init);
    ADC12_B_setupSamplingTimer(ADC12_B_BASE, ADC12_B_CYCLEHOLD_32_CYCLES,
                               ADC12_B_CYCLEHOLD_4_CYCLES,
                               ADC12_B_MULTIPLESAMPLESENABLE);
    ADC12_B_configureMemory(ADC12_B_BASE, &memory_init1);
    ADC12_B_configureMemory(ADC12_B_BASE, &memory_init2);
    ADC12_B_configureMemory(ADC12_B_BASE, &memory_init3);

    ADC12_B_clearInterrupt(ADC12_B_BASE, 0, ADC12_B_IFG2);
    ADC12_B_enableInterrupt(ADC12_B_BASE, ADC12_B_IE2, 0, 0);
    ADC12_B_enable(ADC12_B_BASE);
    ADC12_B_startConversion(ADC12_B_BASE, ADC12_B_START_AT_ADC12MEM0, ADC12_B_SEQOFCHANNELS);
}

外部电源模式配置：

void ADC_initExternalMode()
{
    ADC12_B_disableConversions(ADC12_B_BASE, ADC12_B_PREEMPTCONVERSION);
    ADC12_B_disable(ADC12_B_BASE);

    REFCTL0 &= ~REFON;
    while (REFCTL0 & REFGENBUSY);
    REFCTL0 |= REFVSEL_1 | REFON;
    while (!(REFCTL0 & REFGENRDY));
    __delay_cycles(75);

    adc_init.clockSourceSelect = ADC12_B_CLOCKSOURCE_ACLK;
    adc_init.clockSourceDivider = ADC12_B_CLOCKDIVIDER_1;
    adc_init.clockSourcePredivider = ADC12_B_CLOCKPREDIVIDER__1;
    adc_init.internalChannelMap = ADC12_B_NOINTCH;
    adc_init.sampleHoldSignalSourceSelect = ADC12_B_SAMPLEHOLDSOURCE_SC;

    // Same memory configuration as internal mode
    ADC12_B_init(ADC12_B_BASE, &adc_init);
    ADC12_B_setupSamplingTimer(ADC12_B_BASE, ADC12_B_CYCLEHOLD_32_CYCLES,
                               ADC12_B_CYCLEHOLD_4_CYCLES,
                               ADC12_B_MULTIPLESAMPLESENABLE);
    ADC12_B_configureMemory(ADC12_B_BASE, &memory_init1);
    ADC12_B_configureMemory(ADC12_B_BASE, &memory_init2);
    ADC12_B_configureMemory(ADC12_B_BASE, &memory_init3);

    ADC12_B_clearInterrupt(ADC12_B_BASE, 0, ADC12_B_IFG2);
    ADC12_B_disableInterrupt(ADC12_B_BASE, ADC12_B_IE2, 0, 0);
    ADC12_B_enable(ADC12_B_BASE);
    ADC12_B_startConversion(ADC12_B_BASE, ADC12_B_START_AT_ADC12MEM0, ADC12_B_REPEATED_SEQOFCHANNELS);
}

在内部电池模式下、会启用 ADC ISR。 在每次 ISR 触发时、我都会关闭 ADC12_B 和 REF_A 模块。 在1秒超时后将重新启用这些选项。

void ADC_Handler()
{
// ADC handler running in 10ms timer loop
   if(PowerstateSwitch == "Internal")
   {
   //ADC_UPDATE_DURATION is 1000
       if (ADC_capture_enable_counter >= ADC_UPDATE_DURATION) {
           Ref_A_enableReferenceVoltage(REF_A_BASE);
           if(Ref_A_isRefGenActive(REF_A_BASE))
           {
               ADC12_B_enable(ADC12_B_BASE);
               ADC12_B_startConversion(ADC12_B_BASE, ADC12_B_START_AT_ADC12MEM0, ADC12_B_SEQOFCHANNELS);
               ADC_capture_enable_counter = 0;
           }
           ADC_DataRead();
       } else {
           ADC_capture_enable_counter += 10;
       }
   }
   else
   {
       ADC_DataRead();
   }
}

#pragma vector=ADC12_B_VECTOR
__interrupt void ADC12ISR(void)
{
    if (PowerstateSwitch == false) // internal supply
    {
        ADC12_B_disable(ADC12_B_BASE); // Save power
        Ref_A_disableReferenceVoltage(REF_A_BASE); // Save more power
    }

    ADC12_B_clearInterrupt(ADC12_B_BASE, 0, ADC12_B_IFG2);
    ADC_DataRead(); // Read the latest values
}

在外部供电模式下、这两个模块都会重新配置并持续运行、无需 ADC ISR。 有人能确认我的实施是否正确吗？

为了降低功耗、我进行了此设置。

此致、

Sakhan