diff options
Diffstat (limited to 'controller/fw/src/adc.c')
| -rw-r--r-- | controller/fw/src/adc.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/controller/fw/src/adc.c b/controller/fw/src/adc.c index 5f6b995..4801525 100644 --- a/controller/fw/src/adc.c +++ b/controller/fw/src/adc.c @@ -12,6 +12,7 @@ static DMA_TypeDef *const adc_dma = DMA2; static DMA_Stream_TypeDef *const mem_stream = DMA2_Stream1; static DMA_Stream_TypeDef *const adc_stream = DMA2_Stream0; static const int dma_adc_channel = 0; +static const int adc_channel = 10; /* Configure ADC1 to sample channel 0. Trigger from TIM1 CC0 every 1ms. Transfer readings into alternating buffers * throug DMA. Enable DMA interrupts. @@ -24,9 +25,13 @@ static const int dma_adc_channel = 0; * This means we can immediately start running an FFT on ADC DMA transfer complete interrupt. */ void adc_init() { - RCC->AHB1ENR |= RCC_AHB1ENR_DMA2EN; + RCC->AHB1ENR |= RCC_AHB1ENR_DMA2EN | RCC_AHB1ENR_GPIOCEN; RCC->APB2ENR |= RCC_APB2ENR_ADC1EN | RCC_APB2ENR_TIM1EN; + /* PC0 -> ADC1.ch10 */ + GPIOC->MODER &= ~GPIO_MODER_MODER0_Msk; + GPIOC->MODER |= (3<<GPIO_MODER_MODER0_Pos); + adc_dma->LIFCR |= 0x3f; adc_stream->CR = 0; /* disable */ while (adc_stream->CR & DMA_SxCR_EN) @@ -45,13 +50,15 @@ void adc_init() { ADC1->CR1 = (0<<ADC_CR1_RES_Pos) | (0<<ADC_CR1_DISCNUM_Pos) | ADC_CR1_DISCEN | (0<<ADC_CR1_AWDCH_Pos); ADC1->CR2 = ADC_CR2_EXTEN | (0<<ADC_CR2_EXTSEL_Pos) | ADC_CR2_DMA | ADC_CR2_ADON | ADC_CR2_DDS; + ADC1->SQR3 = (adc_channel<<ADC_SQR3_SQ3_Pos); + ADC1->SQR1 = (0<<ADC_SQR1_L_Pos); TIM1->CR2 = (2<<TIM_CR2_MMS_Pos); /* Enable update event on TRGO to provide a 1ms reference to rest of system */ TIM1->CR1 = TIM_CR1_CEN; TIM1->CCMR1 = (6<<TIM_CCMR1_OC1M_Pos) | (0<<TIM_CCMR1_CC1S_Pos); TIM1->CCER = TIM_CCER_CC1E; - TIM1->PSC = 84; /* 1us ticks @ f_APB2=84MHz */ - TIM1->ARR = 1000; /* 1ms period */ + TIM1->PSC = 84-1; /* 1us ticks @ f_APB2=84MHz */ + TIM1->ARR = 1000-1; /* 1ms period */ TIM1->CCR1 = 1; TIM1->EGR = TIM_EGR_UG; } |