src/main/drivers/audio_stm32f7xx.c

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdbool.h>
  22 #include <stdint.h>
  23 #include <math.h>
  24
  25 #include "platform.h"
  26
  27 #include "common/maths.h"
  28
  29 #include "drivers/audio.h"
  30
  31 static DAC_HandleTypeDef hdac;
  32 static TIM_HandleTypeDef handle;
  33 static DAC_ChannelConfTypeDef sConfig;
  34
  35 void audioSetupIO(void)
  36 {
  37     __HAL_RCC_DAC_CLK_ENABLE();
  38     __HAL_RCC_TIM6_CLK_ENABLE();
  39
  40     hdac.Instance = DAC;
  41     HAL_DAC_Init(&hdac);
  42
  43     GPIO_InitTypeDef GPIO_InitStruct;
  44     GPIO_InitStruct.Pin = GPIO_PIN_4;
  45     GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  46     GPIO_InitStruct.Pull = GPIO_NOPULL;
  47     HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
  48 }
  49
  50 void audioGenerateWhiteNoise(void)
  51 {
  52     // TIM6 runs on APB2 at 42Mhz
  53     handle.Instance = TIM6;
  54     handle.Init.Period = 0xFF;
  55     handle.Init.Prescaler = 0;
  56
  57     handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  58     handle.Init.CounterMode = TIM_COUNTERMODE_UP;
  59     handle.Init.RepetitionCounter = 0;
  60     HAL_TIM_Base_Init(&handle);
  61
  62     TIM_MasterConfigTypeDef sMasterConfig;
  63     sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
  64     sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  65     HAL_TIMEx_MasterConfigSynchronization(&handle, &sMasterConfig);
  66
  67     HAL_TIM_Base_Start(&handle);
  68
  69     sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
  70     sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
  71     HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1);
  72
  73     HAL_DACEx_NoiseWaveGenerate(&hdac, DAC_CHANNEL_1, DAC_LFSRUNMASK_BITS10_0);
  74     HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_L, 0xcd00);
  75
  76     HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
  77 }
  78
  79 #define TONE_SPREAD 8
  80
  81 void audioPlayTone(uint8_t tone)
  82 {
  83     handle.Init.Period = 64 + (MAX(TONE_MIN,MIN(tone, TONE_MAX)) * TONE_SPREAD);
  84     TIM_Base_SetConfig(handle.Instance, &handle.Init);
  85 }
  86
  87 void audioSilence(void)
  88 {
  89     HAL_DAC_Stop(&hdac, DAC_CHANNEL_1);
  90     HAL_TIM_Base_Stop(&handle);
  91 }