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Rack/plugins/community/repos/AudibleInstruments/eurorack/warps/drivers/adc.cc

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  1. // Copyright 2014 Olivier Gillet.

  2. //

  3. // Author: Olivier Gillet (ol.gillet@gmail.com)

  4. //

  5. // Permission is hereby granted, free of charge, to any person obtaining a copy

  6. // of this software and associated documentation files (the "Software"), to deal

  7. // in the Software without restriction, including without limitation the rights

  8. // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  9. // copies of the Software, and to permit persons to whom the Software is

  10. // furnished to do so, subject to the following conditions:

  11. // 

  12. // The above copyright notice and this permission notice shall be included in

  13. // all copies or substantial portions of the Software.

  14. // 

  15. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  16. // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  17. // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  18. // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  19. // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  20. // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

  21. // THE SOFTWARE.

  22. // 

  23. // See http://creativecommons.org/licenses/MIT/ for more information.

  24. //

  25. // -----------------------------------------------------------------------------

  26. //

  27. // Driver for ADC.

  28. 

  29. #include "warps/drivers/adc.h"

  30. 

  31. #include <stm32f4xx_conf.h>

  32. 

  33. namespace warps {

  34.   

  35. void Adc::Init() {

  36.   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

  37.   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

  38.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  39.   

  40.   DMA_InitTypeDef dma_init;

  41.   ADC_CommonInitTypeDef adc_common_init;

  42.   ADC_InitTypeDef adc_init;

  43.   GPIO_InitTypeDef gpio_init;

  44.   

  45.   gpio_init.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;

  46.   gpio_init.GPIO_Pin |= GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;

  47.   gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;

  48.   gpio_init.GPIO_Mode = GPIO_Mode_AN;

  49.   GPIO_Init(GPIOA, &gpio_init);

  50.   

  51.   // Use DMA to automatically copy ADC data register to values_ buffer.

  52.   dma_init.DMA_Channel = DMA_Channel_0;

  53.   dma_init.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;

  54.   dma_init.DMA_Memory0BaseAddr = (uint32_t)&values_[0];

  55.   dma_init.DMA_DIR = DMA_DIR_PeripheralToMemory;

  56.   dma_init.DMA_BufferSize = ADC_LAST;

  57.   dma_init.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

  58.   dma_init.DMA_MemoryInc = DMA_MemoryInc_Enable; 

  59.   dma_init.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

  60.   dma_init.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

  61.   dma_init.DMA_Mode = DMA_Mode_Circular;

  62.   dma_init.DMA_Priority = DMA_Priority_High;

  63.   dma_init.DMA_FIFOMode = DMA_FIFOMode_Disable;

  64.   dma_init.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;

  65.   dma_init.DMA_MemoryBurst = DMA_MemoryBurst_Single;

  66.   dma_init.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

  67.   DMA_Init(DMA2_Stream0, &dma_init);

  68.   DMA_Cmd(DMA2_Stream0, ENABLE);

  69.   

  70.   adc_common_init.ADC_Mode = ADC_Mode_Independent;

  71.   adc_common_init.ADC_Prescaler = ADC_Prescaler_Div8;

  72.   adc_common_init.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;

  73.   adc_common_init.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_20Cycles;

  74.   ADC_CommonInit(&adc_common_init);

  75.   

  76.   adc_init.ADC_Resolution = ADC_Resolution_12b;

  77.   adc_init.ADC_ScanConvMode = ENABLE;

  78.   adc_init.ADC_ContinuousConvMode = DISABLE;

  79.   adc_init.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;

  80.   adc_init.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;

  81.   adc_init.ADC_DataAlign = ADC_DataAlign_Left;

  82.   adc_init.ADC_NbrOfConversion = ADC_LAST;

  83.   ADC_Init(ADC1, &adc_init);

  84.   

  85.   // 168M / 2 / 8 / (8 x (480 + 20)) = 2.6kHz.

  86.   ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_480Cycles);

  87.   ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_480Cycles); 

  88.   ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 3, ADC_SampleTime_480Cycles); 

  89.   ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_480Cycles); 

  90.   ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 5, ADC_SampleTime_480Cycles); 

  91.   ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 6, ADC_SampleTime_480Cycles); 

  92.   ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 7, ADC_SampleTime_480Cycles);

  93.   ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 8, ADC_SampleTime_480Cycles); 

  94.   

  95.   ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

  96.   ADC_Cmd(ADC1, ENABLE);

  97.   ADC_DMACmd(ADC1, ENABLE);

  98.   Convert();

  99. }

  100. 

  101. void Adc::DeInit() {

  102.   DMA_Cmd(DMA2_Stream0, DISABLE);

  103.   ADC_DMARequestAfterLastTransferCmd(ADC1, DISABLE);

  104.   ADC_Cmd(ADC1, DISABLE);

  105.   ADC_DMACmd(ADC1, DISABLE);

  106.   ADC_DeInit();

  107. }

  108. 

  109. void Adc::Convert() {

  110.   ADC_SoftwareStartConv(ADC1);

  111. }

  112. 

  113. }  // namespace warps