eurorack/stereo_mix/drivers/adc.cc

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#include "stereo_mix/drivers/adc.h"
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#include "peripherals.h"
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#include <stm32f0xx_hal.h>
extern "C" {
void DMA_TransferComplete(DMA_HandleTypeDef* dma); // declared in stereo_mix.cc
}
namespace stereo_mix {
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Adc::Adc()
{
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__HAL_RCC_DMA1_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_ADC1_CLK_ENABLE();
GPIO_InitTypeDef gpio_init;
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gpio_init.Pin = GPIO_PIN_0 | GPIO_PIN_1;
gpio_init.Pin |= GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_5;
gpio_init.Pin |= GPIO_PIN_6 | GPIO_PIN_7;
gpio_init.Mode = GPIO_MODE_ANALOG;
HAL_GPIO_Init(GPIOA, &gpio_init);
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gpio_init.Pin = GPIO_PIN_0;
gpio_init.Mode = GPIO_MODE_ANALOG;
HAL_GPIO_Init(GPIOB, &gpio_init);
// Configure the address lines for the MUX.
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gpio_init.Pin = GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14;
gpio_init.Mode = GPIO_MODE_OUTPUT_PP;
gpio_init.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOB, &gpio_init);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14, GPIO_PIN_RESET);
this->mux_index_ = 0;
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hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.ContinuousConvMode = ENABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.DataAlign = ADC_DATAALIGN_LEFT;
hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
hadc1.Init.DMAContinuousRequests = DISABLE;
HAL_ADC_Init(&hadc1);
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HAL_NVIC_SetPriority(ADC1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(ADC1_IRQn);
ADC_ChannelConfTypeDef sConfig;
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
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HAL_ADC_ConfigChannel(&hadc1, &sConfig);
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sConfig.Channel = ADC_CHANNEL_1;
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HAL_ADC_ConfigChannel(&hadc1, &sConfig);
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sConfig.Channel = ADC_CHANNEL_2;
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HAL_ADC_ConfigChannel(&hadc1, &sConfig);
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sConfig.Channel = ADC_CHANNEL_3;
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HAL_ADC_ConfigChannel(&hadc1, &sConfig);
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sConfig.Channel = ADC_CHANNEL_4;
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HAL_ADC_ConfigChannel(&hadc1, &sConfig);
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sConfig.Channel = ADC_CHANNEL_5;
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HAL_ADC_ConfigChannel(&hadc1, &sConfig);
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sConfig.Channel = ADC_CHANNEL_6;
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HAL_ADC_ConfigChannel(&hadc1, &sConfig);
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sConfig.Channel = ADC_CHANNEL_7;
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HAL_ADC_ConfigChannel(&hadc1, &sConfig);
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sConfig.Channel = ADC_CHANNEL_8;
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HAL_ADC_ConfigChannel(&hadc1, &sConfig);
hdma1_channel1.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma1_channel1.Init.PeriphInc = DMA_PINC_DISABLE;
hdma1_channel1.Init.MemInc = DMA_MINC_ENABLE;
hdma1_channel1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
hdma1_channel1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma1_channel1.Init.Mode = DMA_CIRCULAR;
hdma1_channel1.Init.Priority = DMA_PRIORITY_LOW;
HAL_DMA_Init(&hdma1_channel1);
__HAL_LINKDMA(&hadc1, DMA_Handle, hdma1_channel1);
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HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
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HAL_ADC_Start_DMA(&hadc1, (uint32_t*)values_, ADC_CHANNEL_LAST);
}
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Adc::~Adc()
{
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HAL_ADC_DeInit(&hadc1);
}
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void Adc::OnDMATransferComplete()
{
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this->values_[ADC_GROUP_POT + this->mux_index_] = this->values_[ADC_CHANNEL_MUX];
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this->mux_index_ = (this->mux_index_ + 1) % (ADC_CHANNEL_LAST - 1);
uint8_t address = this->mux_index_;
// Write the mux address.
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HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, static_cast<GPIO_PinState>(address & 1));
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_13, static_cast<GPIO_PinState>(address & 2));
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_14, static_cast<GPIO_PinState>(address & 4));
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HAL_ADC_Start_DMA(&hadc1, (uint32_t*)values_, ADC_CHANNEL_LAST);
}
} // namespace rings