Out of curiosity, what is with the QK_ISR_ENTRY and QK_ISR_EXIT macros?
Have you checked if you need to re-enable DMA after it completes a cycle?
On Thu, Jul 9, 2015 at 2:23 PM, Bernard Mentink <bment...@gmail.com> wrote:
> Hi All,
>
> I am trying to get adc conversions put in an array via the dma module.
> It works once on power on, i.e the array gets filled and the end-of-transfer
> interrupt goes off, but even though the dma is put in "circular" mode,
> nothing further happens.
>
> The relevant code is:
>
> -----------------------------------------------------------------------------------------------------------
> void setup_adc(uint32_t adc, uint32_t channels, uint8_t *channel_array)
> {
> adc_disable_external_trigger_regular(adc);
> adc_set_right_aligned(adc);
> adc_set_sample_time_on_all_channels(adc, ADC_SMPR_SMP_3CYC);
> adc_enable_scan_mode(adc);
>
> adc_power_on(adc);
>
> /* Wait for ADC starting up. */
> int i;
> for (i = 0; i < 800000; i++) /* Wait a bit. */
> __asm__("nop");
>
> // adc_reset_calibration(adc); adc_calibration(adc);
>
> adc_set_regular_sequence(adc, channels, channel_array);
> adc_set_continuous_conversion_mode(adc);
> /***** Start conversion (in simultaneous-mode only adc to be triggered)
> *****/
> adc_start_conversion_regular(adc);
>
> }
>
> void setup_adc_dma(uint32_t adc, uint32_t channels, uint8_t *channel_array,
> uint16_t *buff, uint32_t nsamples)
> {
> rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
>
> /* setup DMA */
> rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_DMA2EN);
>
> /* Make sure the ADC doesn't run during config. */
> adc_off(adc);
>
> dma_stream_reset(DMA2, DMA_STREAM0);
>
> dma_set_peripheral_address(DMA2, DMA_STREAM0, (uint32_t) &ADC_DR(adc));
> dma_set_memory_address(DMA2, DMA_STREAM0, (uint32_t) buff);
> dma_enable_memory_increment_mode(DMA2, DMA_STREAM0);
> dma_set_peripheral_size(DMA2, DMA_STREAM0, DMA_SxCR_PSIZE_16BIT);
> dma_set_memory_size(DMA2, DMA_STREAM0, DMA_SxCR_MSIZE_16BIT);
> dma_set_priority(DMA2, DMA_STREAM0, DMA_SxCR_PL_LOW);
>
> dma_enable_transfer_complete_interrupt(DMA2, DMA_STREAM0);
> //dma_enable_half_transfer_interrupt(DMA2, DMA_STREAM0);
> dma_set_number_of_data(DMA2, DMA_STREAM0, nsamples);
> dma_enable_circular_mode(DMA2, DMA_STREAM0);
> dma_set_transfer_mode(DMA2, DMA_STREAM0,DMA_SxCR_DIR_PERIPHERAL_TO_MEM);
> dma_channel_select(DMA2, DMA_STREAM0, DMA_SxCR_CHSEL_0);
>
> dma_enable_stream(DMA2, DMA_STREAM0);
> adc_enable_dma(adc);
>
> setup_adc(adc, channels, channel_array);
> }
>
> void dma2_stream0_isr(void) /* ADC1 dma interrupt */
> {
> volatile uint16_t tmp;
>
> QK_ISR_ENTRY();
>
> if (dma_get_interrupt_flag(DMA2, DMA_STREAM0, DMA_TCIF)) {
> dma_clear_interrupt_flags(DMA2, DMA_STREAM0, DMA_TCIF);
> tmp = adc_data[0]; tmp += 2;
> }
>
> QK_ISR_EXIT();
> }
> -----------------------------------------------------------------------------------------------------------------
>
> Anyone see how to get the a2d conversions/DMA transfer to happen continuous?
>
> Thanks,
> Bernie
>
> --
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