/* * This file is part of the MicroPython project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2019 Damien P. George * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "py/runtime.h" #include "py/mphal.h" #include "adc.h" #if defined(STM32F0) || defined(STM32G0) || defined(STM32G4) || defined(STM32H7) || defined(STM32L0) || defined(STM32L4) || defined(STM32WB) || defined(STM32WL) #define ADC_V2 (1) #else #define ADC_V2 (0) #endif #if defined(STM32F4) #define ADCx_COMMON ADC_COMMON_REGISTER(0) #elif defined(STM32F7) #define ADCx_COMMON ADC123_COMMON #elif defined(STM32L4) #define ADCx_COMMON __LL_ADC_COMMON_INSTANCE(0) #endif #if defined(STM32F0) || defined(STM32G0) || defined(STM32L0) || defined(STM32WL) #define ADC_STAB_DELAY_US (1) #define ADC_TEMPSENSOR_DELAY_US (10) #elif defined(STM32G4) #define ADC_STAB_DELAY_US (1) // TODO: Check if this is enough #elif defined(STM32L4) #define ADC_STAB_DELAY_US (10) #elif defined(STM32WB) #define ADC_STAB_DELAY_US (1) #endif #if defined(STM32F0) #define ADC_SAMPLETIME_DEFAULT ADC_SAMPLETIME_13CYCLES_5 #define ADC_SAMPLETIME_DEFAULT_INT ADC_SAMPLETIME_239CYCLES_5 #elif defined(STM32F4) || defined(STM32F7) #define ADC_SAMPLETIME_DEFAULT ADC_SAMPLETIME_15CYCLES #define ADC_SAMPLETIME_DEFAULT_INT ADC_SAMPLETIME_480CYCLES #elif defined(STM32G4) #define ADC_SAMPLETIME_DEFAULT ADC_SAMPLETIME_12CYCLES_5 #define ADC_SAMPLETIME_DEFAULT_INT ADC_SAMPLETIME_247CYCLES_5 #elif defined(STM32H7) #define ADC_SAMPLETIME_DEFAULT ADC_SAMPLETIME_8CYCLES_5 #define ADC_SAMPLETIME_DEFAULT_INT ADC_SAMPLETIME_387CYCLES_5 #elif defined(STM32G0) || defined(STM32L0) || defined(STM32WL) #define ADC_SAMPLETIME_DEFAULT ADC_SAMPLETIME_12CYCLES_5 #define ADC_SAMPLETIME_DEFAULT_INT ADC_SAMPLETIME_160CYCLES_5 #elif defined(STM32L4) || defined(STM32WB) #define ADC_SAMPLETIME_DEFAULT ADC_SAMPLETIME_12CYCLES_5 #define ADC_SAMPLETIME_DEFAULT_INT ADC_SAMPLETIME_247CYCLES_5 #endif // Timeout for waiting for end-of-conversion #define ADC_EOC_TIMEOUT_MS (10) // This is a synthesised channel representing the maximum ADC reading (useful to scale other channels) #define ADC_CHANNEL_VREF (0xffff) static inline void adc_stabilisation_delay_us(uint32_t us) { mp_hal_delay_us(us + 1); } STATIC void adc_wait_eoc(ADC_TypeDef *adc, int32_t timeout_ms) { uint32_t t0 = mp_hal_ticks_ms(); #if ADC_V2 while (!(adc->ISR & ADC_ISR_EOC)) #else while (!(adc->SR & ADC_SR_EOC)) #endif { if (mp_hal_ticks_ms() - t0 > timeout_ms) { break; // timeout } } } #if defined(STM32H7) STATIC const uint8_t adc_cr_to_bits_table[] = {16, 14, 12, 10, 8, 8, 8, 8}; #else STATIC const uint8_t adc_cr_to_bits_table[] = {12, 10, 8, 6}; #endif void adc_config(ADC_TypeDef *adc, uint32_t bits) { // Configure ADC clock source and enable ADC clock #if defined(STM32G0) || defined(STM32L4) || defined(STM32WB) || defined(STM32WL) __HAL_RCC_ADC_CONFIG(RCC_ADCCLKSOURCE_SYSCLK); __HAL_RCC_ADC_CLK_ENABLE(); #else if (adc == ADC1) { #if defined(STM32G4) || defined(STM32H7) __HAL_RCC_ADC12_CLK_ENABLE(); #else __HAL_RCC_ADC1_CLK_ENABLE(); #endif } #if defined(ADC2) if (adc == ADC2) { #if defined(STM32G4) || defined(STM32H7) __HAL_RCC_ADC12_CLK_ENABLE(); #else __HAL_RCC_ADC2_CLK_ENABLE(); #endif } #endif #if defined(ADC3) if (adc == ADC3) { #if defined(ADC345_COMMON) __HAL_RCC_ADC345_CLK_ENABLE(); #else __HAL_RCC_ADC3_CLK_ENABLE(); #endif } #endif #endif // Configure clock mode #if defined(STM32F0) adc->CFGR2 = 2 << ADC_CFGR2_CKMODE_Pos; // PCLK/4 (synchronous clock mode) #elif defined(STM32F4) || defined(STM32F7) || defined(STM32L4) ADCx_COMMON->CCR = 0; // ADCPR=PCLK/2 #elif defined(STM32H7A3xx) || defined(STM32H7A3xxQ) || defined(STM32H7B3xx) || defined(STM32H7B3xxQ) ADC12_COMMON->CCR = 3 << ADC_CCR_CKMODE_Pos; #elif defined(STM32H7) ADC12_COMMON->CCR = 3 << ADC_CCR_CKMODE_Pos; ADC3_COMMON->CCR = 3 << ADC_CCR_CKMODE_Pos; #elif defined(STM32L0) ADC1_COMMON->CCR = 0; // ADCPR=PCLK/2 #elif defined(STM32WB) ADC1_COMMON->CCR = 0 << ADC_CCR_PRESC_Pos | 0 << ADC_CCR_CKMODE_Pos; // PRESC=1, MODE=ASYNC #elif defined(STM32WL) ADC_COMMON->CCR = 0 << ADC_CCR_PRESC_Pos; // PRESC=1 #endif #if defined(STM32H7) || defined(STM32L4) || defined(STM32WB) if (adc->CR & ADC_CR_DEEPPWD) { adc->CR = 0; // disable deep powerdown } #endif #if defined(STM32H7) || defined(STM32L0) || defined(STM32L4) || defined(STM32WB) || defined(STM32WL) if (!(adc->CR & ADC_CR_ADVREGEN)) { adc->CR = ADC_CR_ADVREGEN; // enable VREG #if defined(STM32H7) mp_hal_delay_us(10); // T_ADCVREG_STUP #elif defined(STM32L4) || defined(STM32WB) mp_hal_delay_us(20); // T_ADCVREG_STUP #endif } #endif #if ADC_V2 if (!(adc->CR & ADC_CR_ADEN)) { // ADC isn't enabled so calibrate it now #if defined(STM32F0) || defined(STM32G0) || defined(STM32L0) || defined(STM32WL) LL_ADC_StartCalibration(adc); #elif defined(STM32G4) || defined(STM32L4) || defined(STM32WB) LL_ADC_StartCalibration(adc, LL_ADC_SINGLE_ENDED); #else LL_ADC_StartCalibration(adc, LL_ADC_CALIB_OFFSET_LINEARITY, LL_ADC_SINGLE_ENDED); #endif while (LL_ADC_IsCalibrationOnGoing(adc)) { } } if (adc->CR & ADC_CR_ADEN) { // ADC enabled, need to disable it to change configuration if (adc->CR & ADC_CR_ADSTART) { adc->CR |= ADC_CR_ADSTP; while (adc->CR & ADC_CR_ADSTP) { } } adc->CR |= ADC_CR_ADDIS; while (adc->CR & ADC_CR_ADDIS) { } } #endif // Find resolution, defaulting to last element in table uint32_t res; for (res = 0; res <= MP_ARRAY_SIZE(adc_cr_to_bits_table); ++res) { if (adc_cr_to_bits_table[res] == bits) { break; } } #if defined(STM32F0) || defined(STM32L0) uint32_t cfgr1_clr = ADC_CFGR1_CONT | ADC_CFGR1_EXTEN | ADC_CFGR1_ALIGN | ADC_CFGR1_RES | ADC_CFGR1_DMAEN; uint32_t cfgr1 = res << ADC_CFGR1_RES_Pos; adc->CFGR1 = (adc->CFGR1 & ~cfgr1_clr) | cfgr1; #elif defined(STM32F4) || defined(STM32F7) uint32_t cr1_clr = ADC_CR1_RES; uint32_t cr1 = res << ADC_CR1_RES_Pos; adc->CR1 = (adc->CR1 & ~cr1_clr) | cr1; uint32_t cr2_clr = ADC_CR2_EXTEN | ADC_CR2_ALIGN | ADC_CR2_DMA | ADC_CR2_CONT; uint32_t cr2 = 0; adc->CR2 = (adc->CR2 & ~cr2_clr) | cr2; adc->SQR1 = 1 << ADC_SQR1_L_Pos; // 1 conversion in regular sequence #elif defined(STM32H7) || defined(STM32L4) || defined(STM32WB) uint32_t cfgr_clr = ADC_CFGR_CONT | ADC_CFGR_EXTEN | ADC_CFGR_RES; #if defined(STM32H7) cfgr_clr |= ADC_CFGR_DMNGT; #else cfgr_clr |= ADC_CFGR_ALIGN | ADC_CFGR_DMAEN; #endif uint32_t cfgr = res << ADC_CFGR_RES_Pos; adc->CFGR = (adc->CFGR & ~cfgr_clr) | cfgr; #endif } STATIC int adc_get_bits(ADC_TypeDef *adc) { #if defined(STM32F0) || defined(STM32G0) || defined(STM32L0) || defined(STM32WL) uint32_t res = (adc->CFGR1 & ADC_CFGR1_RES) >> ADC_CFGR1_RES_Pos; #elif defined(STM32F4) || defined(STM32F7) uint32_t res = (adc->CR1 & ADC_CR1_RES) >> ADC_CR1_RES_Pos; #elif defined(STM32G4) || defined(STM32H7) || defined(STM32L4) || defined(STM32WB) uint32_t res = (adc->CFGR & ADC_CFGR_RES) >> ADC_CFGR_RES_Pos; #endif return adc_cr_to_bits_table[res]; } STATIC void adc_config_channel(ADC_TypeDef *adc, uint32_t channel, uint32_t sample_time) { #if ADC_V2 if (!(adc->CR & ADC_CR_ADEN)) { if (adc->CR & 0x3f) { // Cannot enable ADC with CR!=0 return; } adc->ISR = ADC_ISR_ADRDY; // clear ADRDY adc->CR |= ADC_CR_ADEN; adc_stabilisation_delay_us(ADC_STAB_DELAY_US); while (!(adc->ISR & ADC_ISR_ADRDY)) { } } #else if (!(adc->CR2 & ADC_CR2_ADON)) { adc->CR2 |= ADC_CR2_ADON; adc_stabilisation_delay_us(ADC_STAB_DELAY_US); } #endif #if defined(STM32F0) || defined(STM32G0) || defined(STM32L0) if (channel == ADC_CHANNEL_VREFINT) { ADC1_COMMON->CCR |= ADC_CCR_VREFEN; } else if (channel == ADC_CHANNEL_TEMPSENSOR) { ADC1_COMMON->CCR |= ADC_CCR_TSEN; adc_stabilisation_delay_us(ADC_TEMPSENSOR_DELAY_US); #if defined(ADC_CHANNEL_VBAT) } else if (channel == ADC_CHANNEL_VBAT) { ADC1_COMMON->CCR |= ADC_CCR_VBATEN; #endif } #if defined(STM32G0) adc->SMPR = sample_time << ADC_SMPR_SMP1_Pos; // select sample time from SMP1 (default) #else adc->SMPR = sample_time << ADC_SMPR_SMP_Pos; // select sample time #endif adc->CHSELR = 1 << channel; // select channel for conversion #elif defined(STM32F4) || defined(STM32F7) if (channel == ADC_CHANNEL_VREFINT || channel == ADC_CHANNEL_TEMPSENSOR) { ADCx_COMMON->CCR = (ADCx_COMMON->CCR & ~ADC_CCR_VBATE) | ADC_CCR_TSVREFE; if (channel == ADC_CHANNEL_TEMPSENSOR) { adc_stabilisation_delay_us(ADC_TEMPSENSOR_DELAY_US); } } else if (channel == ADC_CHANNEL_VBAT) { ADCx_COMMON->CCR |= ADC_CCR_VBATE; } adc->SQR3 = (channel & 0x1f) << ADC_SQR3_SQ1_Pos; // select channel for first conversion __IO uint32_t *smpr; if (channel <= 9) { smpr = &adc->SMPR2; } else { smpr = &adc->SMPR1; channel -= 10; } *smpr = (*smpr & ~(7 << (channel * 3))) | sample_time << (channel * 3); // select sample time #elif defined(STM32H7) || defined(STM32L4) || defined(STM32WB) #if defined(STM32H7A3xx) || defined(STM32H7A3xxQ) || defined(STM32H7B3xx) || defined(STM32H7B3xxQ) ADC_Common_TypeDef *adc_common = ADC12_COMMON; #elif defined(STM32H7) adc->PCSEL |= 1 << channel; ADC_Common_TypeDef *adc_common = adc == ADC3 ? ADC3_COMMON : ADC12_COMMON; #elif defined(STM32L4) ADC_Common_TypeDef *adc_common = ADCx_COMMON; #elif defined(STM32WB) ADC_Common_TypeDef *adc_common = ADC1_COMMON; #endif if (channel == ADC_CHANNEL_VREFINT) { adc_common->CCR |= ADC_CCR_VREFEN; } else if (channel == ADC_CHANNEL_TEMPSENSOR) { adc_common->CCR |= ADC_CCR_TSEN; adc_stabilisation_delay_us(ADC_TEMPSENSOR_DELAY_US); } else if (channel == ADC_CHANNEL_VBAT) { adc_common->CCR |= ADC_CCR_VBATEN; } adc->SQR1 = (channel & 0x1f) << ADC_SQR1_SQ1_Pos | (1 - 1) << ADC_SQR1_L_Pos; __IO uint32_t *smpr; if (channel <= 9) { smpr = &adc->SMPR1; } else { smpr = &adc->SMPR2; channel -= 10; } *smpr = (*smpr & ~(7 << (channel * 3))) | sample_time << (channel * 3); // select sample time #endif } STATIC uint32_t adc_read_channel(ADC_TypeDef *adc) { #if ADC_V2 adc->CR |= ADC_CR_ADSTART; #else adc->CR2 |= ADC_CR2_SWSTART; #endif adc_wait_eoc(adc, ADC_EOC_TIMEOUT_MS); uint32_t value = adc->DR; return value; } uint32_t adc_config_and_read_u16(ADC_TypeDef *adc, uint32_t channel, uint32_t sample_time) { if (channel == ADC_CHANNEL_VREF) { return 0xffff; } // Select, configure and read the channel. adc_config_channel(adc, channel, sample_time); uint32_t raw = adc_read_channel(adc); // If VBAT was sampled then deselect it to prevent battery drain. adc_deselect_vbat(adc, channel); // Scale raw reading to 16 bit value using a Taylor expansion (for bits <= 16). uint32_t bits = adc_get_bits(adc); #if defined(STM32H7) if (bits < 8) { // For 6 and 7 bits return raw << (16 - bits) | raw << (16 - 2 * bits) | raw >> (3 * bits - 16); } #endif return raw << (16 - bits) | raw >> (2 * bits - 16); } /******************************************************************************/ // MicroPython bindings for machine.ADC #if !BUILDING_MBOOT const mp_obj_type_t machine_adc_type; typedef struct _machine_adc_obj_t { mp_obj_base_t base; ADC_TypeDef *adc; uint32_t channel; uint32_t sample_time; } machine_adc_obj_t; STATIC void machine_adc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in); unsigned adc_id = 1; #if defined(ADC2) if (self->adc == ADC2) { adc_id = 2; } #endif #if defined(ADC3) if (self->adc == ADC3) { adc_id = 3; } #endif mp_printf(print, "", adc_id, self->channel); } // ADC(id) STATIC mp_obj_t machine_adc_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) { // Check number of arguments mp_arg_check_num(n_args, n_kw, 1, 1, false); mp_obj_t source = all_args[0]; uint32_t channel; uint32_t sample_time = ADC_SAMPLETIME_DEFAULT; ADC_TypeDef *adc; if (mp_obj_is_int(source)) { #if defined(STM32WL) adc = ADC; #else adc = ADC1; #endif channel = mp_obj_get_int(source); if (channel == ADC_CHANNEL_VREFINT #if defined(STM32G4) || channel == ADC_CHANNEL_TEMPSENSOR_ADC1 #else || channel == ADC_CHANNEL_TEMPSENSOR #endif #if defined(ADC_CHANNEL_VBAT) || channel == ADC_CHANNEL_VBAT #endif ) { sample_time = ADC_SAMPLETIME_DEFAULT_INT; } } else { const pin_obj_t *pin = pin_find(source); if (pin->adc_num & PIN_ADC1) { #if defined(STM32WL) adc = ADC; #else adc = ADC1; #endif #if defined(ADC2) } else if (pin->adc_num & PIN_ADC2) { adc = ADC2; #endif #if defined(ADC3) } else if (pin->adc_num & PIN_ADC3) { adc = ADC3; #endif } else { // No ADC function on given pin mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("Pin(%q) does not have ADC capabilities"), pin->name); } channel = pin->adc_channel; // Configure the GPIO pin in ADC mode mp_hal_pin_config(pin, MP_HAL_PIN_MODE_ADC, MP_HAL_PIN_PULL_NONE, 0); } adc_config(adc, 12); machine_adc_obj_t *o = m_new_obj(machine_adc_obj_t); o->base.type = &machine_adc_type; o->adc = adc; o->channel = channel; o->sample_time = sample_time; return MP_OBJ_FROM_PTR(o); } // read_u16() STATIC mp_obj_t machine_adc_read_u16(mp_obj_t self_in) { machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in); return MP_OBJ_NEW_SMALL_INT(adc_config_and_read_u16(self->adc, self->channel, self->sample_time)); } MP_DEFINE_CONST_FUN_OBJ_1(machine_adc_read_u16_obj, machine_adc_read_u16); STATIC const mp_rom_map_elem_t machine_adc_locals_dict_table[] = { { MP_ROM_QSTR(MP_QSTR_read_u16), MP_ROM_PTR(&machine_adc_read_u16_obj) }, { MP_ROM_QSTR(MP_QSTR_VREF), MP_ROM_INT(ADC_CHANNEL_VREF) }, { MP_ROM_QSTR(MP_QSTR_CORE_VREF), MP_ROM_INT(ADC_CHANNEL_VREFINT) }, #if defined(STM32G4) { MP_ROM_QSTR(MP_QSTR_CORE_TEMP), MP_ROM_INT(ADC_CHANNEL_TEMPSENSOR_ADC1) }, #else { MP_ROM_QSTR(MP_QSTR_CORE_TEMP), MP_ROM_INT(ADC_CHANNEL_TEMPSENSOR) }, #endif #if defined(ADC_CHANNEL_VBAT) { MP_ROM_QSTR(MP_QSTR_CORE_VBAT), MP_ROM_INT(ADC_CHANNEL_VBAT) }, #endif }; STATIC MP_DEFINE_CONST_DICT(machine_adc_locals_dict, machine_adc_locals_dict_table); const mp_obj_type_t machine_adc_type = { { &mp_type_type }, .name = MP_QSTR_ADC, .print = machine_adc_print, .make_new = machine_adc_make_new, .locals_dict = (mp_obj_dict_t *)&machine_adc_locals_dict, }; #endif