mirror of
https://github.com/betaflight/betaflight.git
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91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/*
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* This file is part of Cleanflight and Betaflight.
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*
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* Cleanflight and Betaflight are free software. You can redistribute
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* this software and/or modify this software under the terms of the
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* GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option)
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* any later version.
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*
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* Cleanflight and Betaflight are distributed in the hope that they
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software.
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*
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <math.h>
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#include "platform.h"
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#include "common/maths.h"
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#include "drivers/audio.h"
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static DAC_HandleTypeDef hdac;
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static TIM_HandleTypeDef handle;
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static DAC_ChannelConfTypeDef sConfig;
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void audioSetupIO(void)
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{
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__HAL_RCC_DAC_CLK_ENABLE();
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__HAL_RCC_TIM6_CLK_ENABLE();
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hdac.Instance = DAC;
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HAL_DAC_Init(&hdac);
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GPIO_InitTypeDef GPIO_InitStruct;
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GPIO_InitStruct.Pin = GPIO_PIN_4;
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GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
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}
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void audioGenerateWhiteNoise(void)
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{
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// TIM6 runs on APB2 at 42Mhz
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handle.Instance = TIM6;
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handle.Init.Period = 0xFF;
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handle.Init.Prescaler = 0;
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handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
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handle.Init.CounterMode = TIM_COUNTERMODE_UP;
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handle.Init.RepetitionCounter = 0;
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HAL_TIM_Base_Init(&handle);
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TIM_MasterConfigTypeDef sMasterConfig;
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sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
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sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
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HAL_TIMEx_MasterConfigSynchronization(&handle, &sMasterConfig);
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HAL_TIM_Base_Start(&handle);
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sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
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sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
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HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1);
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HAL_DACEx_NoiseWaveGenerate(&hdac, DAC_CHANNEL_1, DAC_LFSRUNMASK_BITS10_0);
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HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_L, 0xcd00);
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HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
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}
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#define TONE_SPREAD 8
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void audioPlayTone(uint8_t tone)
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{
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handle.Init.Period = 64 + (MAX(TONE_MIN,MIN(tone, TONE_MAX)) * TONE_SPREAD);
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TIM_Base_SetConfig(handle.Instance, &handle.Init);
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}
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void audioSilence(void)
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{
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HAL_DAC_Stop(&hdac, DAC_CHANNEL_1);
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HAL_TIM_Base_Stop(&handle);
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}
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