eurorack/stereo_mix/drivers/adc.cc

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#include "stereo_mix/drivers/adc.h"
#include <stm32f0xx.h>
namespace stereo_mix {
void Adc::Init()
{
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
ADC_InitTypeDef adc_init;
GPIO_InitTypeDef gpio_init;
gpio_init.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
gpio_init.GPIO_Pin |= GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
gpio_init.GPIO_Pin |= GPIO_Pin_6 | GPIO_Pin_7;
gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
gpio_init.GPIO_Mode = GPIO_Mode_AN;
GPIO_Init(GPIOA, &gpio_init);
gpio_init.GPIO_Pin = GPIO_Pin_0;
gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
gpio_init.GPIO_Mode = GPIO_Mode_AN;
GPIO_Init(GPIOB, &gpio_init);
// Configure the address lines for the MUX.
gpio_init.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14;
gpio_init.GPIO_Mode = GPIO_Mode_OUT;
gpio_init.GPIO_OType = GPIO_OType_PP;
gpio_init.GPIO_Speed = GPIO_Speed_2MHz;
gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &gpio_init);
GPIO_ResetBits(GPIOB, GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14);
this->mux_index_ = 0;
adc_init.ADC_Resolution = ADC_Resolution_12b;
adc_init.ADC_ContinuousConvMode = ENABLE;
adc_init.ADC_DataAlign = ADC_DataAlign_Left;
adc_init.ADC_ScanDirection = ADC_ScanDirection_Upward;
ADC_Init(ADC1, &adc_init);
ADC_ClockModeConfig(ADC1, ADC_ClockMode_SynClkDiv2);
ADC_ChannelConfig(ADC1, ADC_Channel_0, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_1, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_2, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_3, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_4, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_5, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_6, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_7, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_8, ADC_SampleTime_239_5Cycles);
ADC_Cmd(ADC1, ENABLE);
ADC_DMACmd(ADC1, ENABLE);
DMA_InitTypeDef dma_init;
DMA_StructInit(&dma_init);
dma_init.DMA_DIR = DMA_DIR_PeripheralSRC;
dma_init.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
dma_init.DMA_MemoryBaseAddr = (uint32_t)&values_[0];
dma_init.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
dma_init.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
dma_init.DMA_BufferSize = ADC_CHANNEL_NUM_DIRECT;
dma_init.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
dma_init.DMA_MemoryInc = DMA_MemoryInc_Enable;
dma_init.DMA_Mode = DMA_Mode_Circular;
dma_init.DMA_Priority = DMA_Priority_High;
dma_init.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &dma_init);
NVIC_EnableIRQ(DMA1_Channel1_IRQn);
NVIC_SetPriority(DMA1_Channel1_IRQn, 0);
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
DMA_Cmd(DMA1_Channel1, ENABLE);
ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_OneShot);
/*NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
*/
ADC_StartOfConversion(ADC1);
}
void Adc::DeInit()
{
ADC_Cmd(ADC1, DISABLE);
ADC_DeInit(ADC1);
}
void Adc::OnDMAFinish()
{
this->values_[ADC_CHANNEL_FIRST_MUXED + this->mux_index_] = this->values_[ADC_CHANNEL_MUX];
this->mux_index_ = (this->mux_index_ + 1) % ADC_CHANNEL_NUM_MUXED;
uint8_t address = this->mux_index_;
// Write the mux address.
GPIO_WriteBit(GPIOB, GPIO_Pin_12, static_cast<BitAction>(address & 1));
GPIO_WriteBit(GPIOB, GPIO_Pin_13, static_cast<BitAction>(address & 2));
GPIO_WriteBit(GPIOB, GPIO_Pin_14, static_cast<BitAction>(address & 4));
ADC_StartOfConversion(ADC1);
}
} // namespace rings