trigger_scope.cpp

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#include "pch.h"
 
#ifdef TRIGGER_SCOPE
 
#include "trigger_scope.h"
#include "trigger_scope_config.h"
 
static BigBufferHandle buffer;
 
static bool isRunning = false;
 
static void completionCallback(ADCDriver* adcp) {
    if (isRunning && adcp->state == ADC_COMPLETE) {
        engine->outputChannels.triggerScopeReady = true;
    }
}
 
static const uint32_t smpr1 =
    ADC_SMPR1_SMP_AN10(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR1_SMP_AN11(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR1_SMP_AN12(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR1_SMP_AN13(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR1_SMP_AN14(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR1_SMP_AN15(TRIGGER_SCOPE_SAMPLE_TIME);
 
static const uint32_t smpr2 =
    ADC_SMPR2_SMP_AN0(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR2_SMP_AN1(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR2_SMP_AN2(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR2_SMP_AN3(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR2_SMP_AN4(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR2_SMP_AN5(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR2_SMP_AN6(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR2_SMP_AN7(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR2_SMP_AN8(TRIGGER_SCOPE_SAMPLE_TIME) |
    ADC_SMPR2_SMP_AN9(TRIGGER_SCOPE_SAMPLE_TIME);
 
static const ADCConversionGroup adcConvGroupCh1 = { FALSE, 2, &completionCallback, nullptr,
    ADC_CR1_RES_1,  // Sample in 8-bit mode
    ADC_CR2_SWSTART,
    // sample times for channels 10...18
    smpr1,
    // sample times for channels 0...9
    smpr2,
 
    0,  // htr
    0,  // ltr
 
    0,  // sqr1
    0,  // sqr2
    ADC_SQR3_SQ1_N(TRIGGER_SCOPE_ADC_CH1) | ADC_SQR3_SQ2_N(TRIGGER_SCOPE_ADC_CH2)
};
 
static constexpr size_t sampleCount = BIG_BUFFER_SIZE / (2 * sizeof(uint8_t));
 
static void startSampling() {
    chibios_rt::CriticalSectionLocker csl;
 
    if (buffer && !engineConfiguration->enableSoftwareKnock) {
        // Cancel if ADC isn't ready
        if (!((TRIGGER_SCOPE_ADC.state == ADC_READY) ||
                (TRIGGER_SCOPE_ADC.state == ADC_COMPLETE) ||
                (TRIGGER_SCOPE_ADC.state == ADC_ERROR))) {
            triggerScopeDisable();
            return;
        }
 
        adcStartConversionI(&TRIGGER_SCOPE_ADC, &adcConvGroupCh1, buffer.get<adcsample_t>(), sampleCount);
    }
}
 
// Enable one buffer's worth of perf tracing, and retrieve the buffer size in bytes
void triggerScopeEnable() {
    buffer = getBigBuffer(BigBufferUser::TriggerScope);
 
    isRunning = true;
 
    startSampling();
}
 
void triggerScopeDisable() {
    // we're done with the buffer - let somebody else have it
    buffer = {};
 
    isRunning = false;
    engine->outputChannels.triggerScopeReady = false;
}
 
static scheduling_s restartTimer;
 
// Retrieve the trace buffer
const BigBufferHandle& triggerScopeGetBuffer() {
    engine->outputChannels.triggerScopeReady = false;
 
    // Start the next sample once we've read out this one
    if (isRunning) {
        static auto const startSamplingAction{ action_s::make<startSampling>() };
        engine->scheduler.schedule("trigger scope", &restartTimer, getTimeNowNt() + MS2NT(10), startSamplingAction);
    }
 
    return buffer;
}
 
void initTriggerScope() {
    // Trigger scope and knock currently mutually exclusive
    if (!engineConfiguration->enableSoftwareKnock) {
        adcStart(&TRIGGER_SCOPE_ADC, nullptr);
 
        // Manually set ADC DMA to byte mode, as we'll be taking 8 bit samples
        // Defaults are to sample at 12 bits, and DMA 16-bit words
        ADCD3.dmamode &= ~(STM32_DMA_CR_PSIZE_MASK | STM32_DMA_CR_MSIZE_MASK);
        ADCD3.dmamode |= STM32_DMA_CR_PSIZE_BYTE | STM32_DMA_CR_MSIZE_BYTE;
 
        efiSetPadMode("trg ch1", TRIGGER_SCOPE_PIN_CH1, PAL_MODE_INPUT_ANALOG);
#if TRIGGER_SCOPE_HAS_CH2
        efiSetPadMode("trg ch2", TRIGGER_SCOPE_PIN_CH2, PAL_MODE_INPUT_ANALOG);
#endif
    }
}
 
#endif // TRIGGER_SCOPE