169 lines
4.2 KiB
C
169 lines
4.2 KiB
C
//ColorChordEmbedded implementation on the STM32F407 for the stm32f4-discovery.
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//Uses on-board microphone and outputs WS2812 signal for configurable number of LEDs
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//on PB5 via DMA+SPI
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#include <stdint.h>
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#include <stdio.h>
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#include <systems.h>
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#include <math.h>
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#include <stm32f4xx_exti.h>
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#include <DFT32.h>
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#include <embeddednf.h>
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#include <embeddedout.h>
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#include "mp45dt02.h"
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volatile int wasclicked = 0; //Used for if the root change button was clicked.
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RCC_ClocksTypeDef RCC_Clocks;
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//Circular buffer for incoming data so we don't spend much time servicing the interrupt and we can handle colorchord in the main thread.
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#define CIRCBUFSIZE 256
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volatile int last_samp_pos;
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int16_t sampbuff[CIRCBUFSIZE];
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volatile int samples;
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//This gets called by the ADC/Microphone
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void GotSample( int samp )
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{
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sampbuff[last_samp_pos] = samp;
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last_samp_pos = ((last_samp_pos+1)%CIRCBUFSIZE);
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samples++;
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}
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//Call this once we've stacked together one full colorchord frame.
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void NewFrame()
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{
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// uint8_t led_outs[NUM_LIN_LEDS*3];
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int i;
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HandleFrameInfo();
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UpdateLinearLEDs();
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SendSPI2812( ledOut, NUM_LIN_LEDS );
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}
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void Configure_PA0(void) {
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/* Set variables used */
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GPIO_InitTypeDef GPIO_InitStruct;
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EXTI_InitTypeDef EXTI_InitStruct;
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NVIC_InitTypeDef NVIC_InitStruct;
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/* Enable clock for GPIOD */
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
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/* Enable clock for SYSCFG */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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/* Set pin as input */
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GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
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GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
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GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_DOWN;
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GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
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GPIO_Init(GPIOA, &GPIO_InitStruct);
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/* Tell system that you will use PA0 for EXTI_Line0 */
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SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
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/* PA0 is connected to EXTI_Line0 */
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EXTI_InitStruct.EXTI_Line = EXTI_Line0;
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/* Enable interrupt */
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EXTI_InitStruct.EXTI_LineCmd = ENABLE;
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/* Interrupt mode */
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EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
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/* Triggers on rising and falling edge */
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EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising;
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/* Add to EXTI */
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EXTI_Init(&EXTI_InitStruct);
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/* Add IRQ vector to NVIC */
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/* PA0 is connected to EXTI_Line0, which has EXTI0_IRQn vector */
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NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn;
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NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00; /* Set priority */
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NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x00; /* Set sub priority */
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NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; /* Enable interrupt */
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NVIC_Init(&NVIC_InitStruct); /* Add to NVIC */
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}
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//Handle button press on PA0.
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void EXTI0_IRQHandler(void)
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{
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static int rootoffset;
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if (EXTI_GetITStatus(EXTI_Line0) != RESET)
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{
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if( wasclicked == 0 )
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wasclicked = 10;
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EXTI_ClearITPendingBit(EXTI_Line0);
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}
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}
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int main(void)
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{
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uint32_t i = 0;
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RCC_GetClocksFreq( &RCC_Clocks );
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ConfigureLED();
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LED_OFF;
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// SysTick end of count event each 10ms
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SysTick_Config( RCC_Clocks.HCLK_Frequency / 100);
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float fv = RCC_Clocks.HCLK_Frequency / 1000000.0f;
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// We can use printf to print back through the debugging interface, but that's slow and
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// it also takes up a bunch of space. No printf = no space wasted in printf.
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// printf( "Operating at %.3fMHz\n", fv );
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InitColorChord();
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Configure_PA0();
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InitMP45DT02();
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InitSPI2812();
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int this_samp = 0;
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int wf = 0;
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while(1)
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{
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if( this_samp != last_samp_pos )
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{
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LED_OFF; //Use led on the board to show us how much CPU we're using. (You can also probe PB15)
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PushSample32( sampbuff[this_samp]/2 ); //Can't put in full volume.
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this_samp = (this_samp+1)%CIRCBUFSIZE;
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wf++;
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if( wf == 128 )
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{
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NewFrame();
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wf = 0;
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}
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LED_ON;
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}
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LED_ON; //Take up a little more time to make sure we don't miss this.
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}
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}
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void TimingDelay_Decrement()
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{
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static int rootoffset;
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//A way of making sure we debounce the button.
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if( wasclicked )
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{
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if( wasclicked == 10 )
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{
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if( rootoffset++ >= 12 ) rootoffset = 0;
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RootNoteOffset = (rootoffset * NOTERANGE) / 12;
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}
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wasclicked--;
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}
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}
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