Hal Message Wave File
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Audio files for HAL 9000 are not included here, lest we run afoul of copyright issues, but with just a bit of Google searching you can find an ample supply already in WAV format. Once you have WAV files you're happy with, you'll want to drag and drop them directly onto your CIRCUITPY drive.
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| /* |
| Software Audio PWM |
| Timer 3 used to create a software audo pwm. |
| This function is useful when you want to create some audio sounds |
| and you don't hava a DAC. |
| With this fast PWM and a RC-Low pass filter you can produce with |
| minimum efforts audio sounds. |
| Restrictions and hints: |
| - with this routine the intterrupt load is double of a hardware PEM impementation |
| - the voltage after the RC-lowpas has only a range of ~2Vpp because of the interrupt |
| processing time needs |
| HAL ( Hardware Abstraction Layer ) |
| Example on how access the HAL within the STM32GENERIC Arduino framework. |
| contributers and preliminara works by: michael_l, danieleff |
| June 2015, ChrisMicro |
| */ |
| static TIM_HandleTypeDef s_TimerInstance = |
| { |
| .Instance = TIM3 |
| }; |
| #defineSOUNDPIN PB0 |
| #defineMEANPERIOD500 |
| #defineDAC_MAX_AMPLITUDE256 |
| //#define SAMPLINGFREQUENCY 44100 |
| #defineWAVEBUFFERLENGTH256 |
| int32_t WaveBuffer[WAVEBUFFERLENGTH]; |
| // this default values will be overwritten |
| volatileint32_t PeriodLow = 1000; |
| volatileint32_t PeriodHigh = 1000; |
| voidsetAmplitude(int32_t amplitude) |
| { |
| PeriodLow = MEANPERIOD - amplitude; |
| PeriodHigh = MEANPERIOD + amplitude; |
| } |
| extern'C'voidTIM3_IRQHandler(void) |
| { |
| static boolean flag = false; |
| staticint32_tindex = 0; |
| if (__HAL_TIM_GET_FLAG(&s_TimerInstance, TIM_FLAG_UPDATE) != RESET) |
| { |
| if (__HAL_TIM_GET_IT_SOURCE(&s_TimerInstance, TIM_IT_UPDATE) != RESET) |
| { |
| __HAL_TIM_CLEAR_IT(&s_TimerInstance, TIM_IT_UPDATE); |
| digitalWrite( SOUNDPIN, flag ); |
| if (flag) __HAL_TIM_SET_AUTORELOAD(&s_TimerInstance, PeriodLow); |
| else |
| { |
| __HAL_TIM_SET_AUTORELOAD( &s_TimerInstance, PeriodHigh ); |
| setAmplitude( WaveBuffer[ index++ ] ); |
| if ( index > WAVEBUFFERLENGTH ) index = 0 ; |
| } |
| flag = !flag; |
| } |
| } |
| } |
| voidsetup() |
| { |
| pinMode(LED_BUILTIN, OUTPUT); |
| pinMode(SOUNDPIN, OUTPUT); |
| HAL_NVIC_SetPriority( TIM3_IRQn, 0, 0 ); |
| HAL_NVIC_EnableIRQ ( TIM3_IRQn ); |
| s_TimerInstance.Init.Prescaler = 0; //APB1 TIM3 has 84MHZ, 72MHz |
| s_TimerInstance.Init.CounterMode = TIM_COUNTERMODE_UP; |
| s_TimerInstance.Init.Period = 2000 - 1; // prescaler gives 2khz time base |
| s_TimerInstance.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; |
| s_TimerInstance.Init.RepetitionCounter = 0; |
| __HAL_RCC_TIM3_CLK_ENABLE(); |
| HAL_TIM_Base_Init ( &s_TimerInstance ); |
| HAL_TIM_Base_Start_IT ( &s_TimerInstance ); |
| // initialize sine wave buffer |
| for (int n = 0; n < WAVEBUFFERLENGTH; n++) |
| { |
| constfloat frequency = 440; |
| constfloat amplitude = DAC_MAX_AMPLITUDE; |
| //int32_t val = ( sin( 2 * PI * frequency / SAMPLINGFREQUENCY * n )) * amplitude; |
| int32_t val = ( sin( 2 * PI * n / WAVEBUFFERLENGTH )) * amplitude; |
| WaveBuffer[n] = val; |
| } |
| } |
| voidloop() |
| { |
| // to noughting, sound is produced in interrupt routine |
| } |
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