mirror of https://github.com/rusefi/rusefi-1.git
114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
/**
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* @file stm32_adc_v2.cpp
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* @brief Port implementation for the STM32 "v2" ADC found on the STM32F4 and STM32F7
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*
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* @date February 9, 2021
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* @author Matthew Kennedy, (c) 2021
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*/
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#include "engine_ptr.h"
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#include "persistent_configuration.h"
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#if HAL_USE_ADC
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EXTERN_CONFIG;
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void portInitAdc() {
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// Init slow ADC
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adcStart(&ADCD1, NULL);
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// Init fast ADC (MAP sensor)
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adcStart(&ADCD2, NULL);
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// Enable internal temperature reference
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adcSTM32EnableTSVREFE(); // Internal temperature sensor
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#if defined(STM32F7XX)
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/* the temperature sensor is internally
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* connected to the same input channel as VBAT. Only one conversion,
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* temperature sensor or VBAT, must be selected at a time. */
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adcSTM32DisableVBATE();
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#endif
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/* Enable this code only when you absolutly sure
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* that there is no possible errors from ADC */
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#if 0
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/* All ADC use DMA and DMA calls end_cb from its IRQ
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* If none of ADC users need error callback - we can disable
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* shared ADC IRQ and save some CPU ticks */
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if ((adcgrpcfgSlow.error_cb == NULL) &&
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(adcgrpcfgFast.error_cb == NULL)
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/* TODO: Add ADC3? */) {
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nvicDisableVector(STM32_ADC_NUMBER);
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}
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#endif
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}
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/*
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* ADC conversion group.
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*/
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static const ADCConversionGroup tempSensorConvGroup = {
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.circular = FALSE,
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.num_channels = 1,
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.end_cb = nullptr,
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.error_cb = nullptr,
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/* HW dependent part below */
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.cr1 = 0,
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.cr2 = ADC_CR2_SWSTART,
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// sample times for channels 10...18
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.smpr1 =
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ADC_SMPR1_SMP_VBAT(ADC_SAMPLE_144) | /* input18 - temperature and vbat input on some STM32F7xx */
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ADC_SMPR1_SMP_SENSOR(ADC_SAMPLE_144), /* input16 - temperature sensor input on STM32F4xx */
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.smpr2 = 0,
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.htr = 0, .ltr = 0,
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.sqr1 = 0,
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.sqr2 = 0,
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#if defined(STM32F4XX)
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.sqr3 = ADC_SQR3_SQ1_N(16),
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#endif
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#if defined(STM32F7XX)
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.sqr3 = ADC_SQR3_SQ1_N(18),
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#endif
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};
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float getMcuTemperature() {
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// 4x oversample is plenty
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constexpr int oversample = 4;
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// Buffer is a full 32 bytes to occupy a full cache line
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__ALIGNED(32) adcsample_t samples[16];
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// Temperature sensor is only physically wired to ADC1
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adcConvert(&ADCD1, &tempSensorConvGroup, samples, oversample);
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#if CORTEX_MODEL == 7
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// The STM32F7xx/STM32H7xx has a data cache
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// DMA operations DO NOT invalidate cache lines, since the ARM m7 doesn't have
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// anything like a CCI that maintains coherency across multiple bus masters.
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// As a result, we have to manually invalidate the D-cache any time we (the CPU)
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// would like to read something that somebody else wrote (ADC via DMA, in this case)
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SCB_InvalidateDCache_by_Addr(reinterpret_cast<uint32_t*>(samples), sizeof(samples));
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#endif /* CORTEX_MODEL == 7 */
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uint32_t sum = 0;
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for (size_t i = 0; i < oversample; i++) {
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sum += samples[i];
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}
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float volts = (float)sum / (4096 * oversample);
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volts *= CONFIG(adcVcc);
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volts -= 0.760f; // Subtract the reference voltage at 25 deg C
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float degrees = volts / 0.0025f; // Divide by slope 2.5mV
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degrees += 25.0; // Add the 25 deg C
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if (degrees > 150.0f || degrees < -50.0f) {
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firmwareError(OBD_PCM_Processor_Fault, "Invalid CPU temperature measured %f", degrees);
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}
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return degrees;
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}
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#endif // HAL_USE_ADC
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