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

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  1. // Copyright 2013 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 DAC.

  28. 

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

  30. 

  31. #include <stm32f10x_conf.h>

  32. #include <string.h>

  33. 

  34. namespace tides {

  35.   

  36. void Adc::Init(bool single_channel) {

  37.   DMA_InitTypeDef dma_init;

  38.   ADC_InitTypeDef adc_init;

  39.   GPIO_InitTypeDef gpio_init;

  40.   

  41.   gpio_init.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | \

  42.       GPIO_Pin_6 | GPIO_Pin_7;

  43.   gpio_init.GPIO_Speed = GPIO_Speed_10MHz;

  44.   gpio_init.GPIO_Mode = GPIO_Mode_AIN;

  45.   GPIO_Init(GPIOA, &gpio_init);

  46. 

  47.   gpio_init.GPIO_Pin = GPIO_Pin_0;

  48.   gpio_init.GPIO_Speed = GPIO_Speed_10MHz;

  49.   gpio_init.GPIO_Mode = GPIO_Mode_AIN;

  50.   GPIO_Init(GPIOB, &gpio_init);

  51.   

  52.   // Use DMA to automatically copy DAC data register to values_ buffer.

  53.   DMA_DeInit(DMA1_Channel1);

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

  55.   dma_init.DMA_MemoryBaseAddr = (uint32_t)&values_[0]; 

  56.   dma_init.DMA_DIR = DMA_DIR_PeripheralSRC; 

  57.   dma_init.DMA_BufferSize = single_channel ? 1 : ADC_CHANNEL_LAST; 

  58.   dma_init.DMA_PeripheralInc = DMA_PeripheralInc_Disable; 

  59.   dma_init.DMA_MemoryInc = DMA_MemoryInc_Enable; 

  60.   dma_init.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; 

  61.   dma_init.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; 

  62.   dma_init.DMA_Mode = DMA_Mode_Circular; 

  63.   dma_init.DMA_Priority = DMA_Priority_High;

  64.   dma_init.DMA_M2M = DMA_M2M_Disable; 

  65.   DMA_Init(DMA1_Channel1, &dma_init);

  66.   DMA_Cmd(DMA1_Channel1, ENABLE);

  67.   

  68.   ADC_DeInit(ADC1);

  69.   adc_init.ADC_Mode = ADC_Mode_Independent;

  70.   adc_init.ADC_ScanConvMode = ENABLE;

  71.   adc_init.ADC_ContinuousConvMode = ENABLE;

  72.   adc_init.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;

  73.   adc_init.ADC_DataAlign = ADC_DataAlign_Left;

  74.   adc_init.ADC_NbrOfChannel = single_channel ? 1 : ADC_CHANNEL_LAST;

  75.   ADC_Init(ADC1, &adc_init);

  76.   

  77.   if (single_channel) {

  78.     ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_71Cycles5);

  79.   } else {

  80.     ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 1, ADC_SampleTime_71Cycles5);

  81.     ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 2, ADC_SampleTime_71Cycles5); 

  82.     ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 3, ADC_SampleTime_55Cycles5); 

  83.     ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 4, ADC_SampleTime_28Cycles5); 

  84.     ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 5, ADC_SampleTime_28Cycles5); 

  85.     ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 6, ADC_SampleTime_28Cycles5); 

  86.     ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 7, ADC_SampleTime_28Cycles5); 

  87.   }

  88.   

  89.   ADC_Cmd(ADC1, ENABLE);

  90.   ADC_ResetCalibration(ADC1);

  91.   while (ADC_GetResetCalibrationStatus(ADC1));

  92.   ADC_StartCalibration(ADC1);

  93.   while (ADC_GetCalibrationStatus(ADC1));

  94. 

  95.   ADC_DMACmd(ADC1, ENABLE);

  96.   ADC_SoftwareStartConvCmd(ADC1, ENABLE);

  97. }

  98. 

  99. void Adc::DeInit() {

  100.   ADC_SoftwareStartConvCmd(ADC1, DISABLE);

  101.   ADC_DMACmd(ADC1, DISABLE);

  102.   ADC_Cmd(ADC1, DISABLE);

  103. }

  104. 

  105. }  // namespace tides