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Rack/plugins/community/repos/AudibleInstruments/eurorack/streams/drivers/pwm.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 "streams/drivers/pwm.h"

  30. 

  31. namespace streams {

  32.   

  33. void Pwm::Init() {

  34.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  35.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

  36.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

  37.   

  38.   GPIO_InitTypeDef gpio_init;

  39.   gpio_init.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;

  40.   gpio_init.GPIO_Speed = GPIO_Speed_10MHz;

  41.   gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;

  42.   GPIO_Init(GPIOA, &gpio_init);

  43.   

  44.   TIM_TimeBaseInitTypeDef timer_init;

  45.   timer_init.TIM_Period = (1 << kPwmResolution) - 1;

  46.   timer_init.TIM_Prescaler = 0;

  47.   timer_init.TIM_ClockDivision = TIM_CKD_DIV1;

  48.   timer_init.TIM_CounterMode = TIM_CounterMode_Up;

  49.   timer_init.TIM_RepetitionCounter = 0;

  50.   TIM_InternalClockConfig(TIM1);

  51.   TIM_TimeBaseInit(TIM1, &timer_init);

  52.   

  53.   TIM_OCInitTypeDef output_compare_init;

  54.   output_compare_init.TIM_OCMode = TIM_OCMode_PWM1;

  55.   output_compare_init.TIM_OutputState = TIM_OutputState_Enable;

  56.   output_compare_init.TIM_OutputNState = TIM_OutputNState_Disable;

  57.   output_compare_init.TIM_Pulse = 0x00;

  58.   output_compare_init.TIM_OCPolarity = TIM_OCPolarity_High;

  59.   output_compare_init.TIM_OCNPolarity = TIM_OCNPolarity_High;

  60.   TIM_OC3Init(TIM1, &output_compare_init);

  61.   TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);

  62.   

  63.   output_compare_init.TIM_OCMode = TIM_OCMode_PWM1;

  64.   output_compare_init.TIM_OutputState = TIM_OutputState_Enable;

  65.   output_compare_init.TIM_Pulse = 0x00;

  66.   output_compare_init.TIM_OCPolarity = TIM_OCPolarity_High;

  67.   TIM_OC4Init(TIM1, &output_compare_init);

  68.   TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);

  69.   

  70.   TIM_CtrlPWMOutputs(TIM1, ENABLE);

  71.   TIM_Cmd(TIM1, ENABLE);

  72. }

  73. 

  74. }  // namespace streams