Make it possible to change the key of ColorChord on ColorChord Embedded applications.

embeddedcommon/embeddedout.c

@@ -8,6 +8,8 @@ uint16_t ledAmpOut[NUM_LIN_LEDS];
 uint8_t ledFreqOut[NUM_LIN_LEDS];
 uint8_t ledFreqOutOld[NUM_LIN_LEDS];
 
+uint8_t RootNoteOffset;
+
 void UpdateLinearLEDs()
 {
 	//Source material:
@@ -188,7 +190,7 @@ void UpdateLinearLEDs()
 
 		uint16_t amp = ledAmpOut[j];
 		if( amp > 255 ) amp = 255;
-		uint32_t color = ECCtoHEX( ledFreqOut[j], 255, amp );
+		uint32_t color = ECCtoHEX( (ledFreqOut[j]+RootNoteOffset)%NOTERANGE, 255, amp );
 		ledOut[l*3+0] = ( color >> 0 ) & 0xff;
 		ledOut[l*3+1] = ( color >> 8 ) & 0xff;
 		ledOut[l*3+2] = ( color >>16 ) & 0xff;

embeddedcommon/embeddedout.h

@@ -19,6 +19,7 @@
 
 extern uint8_t ledArray[];
 extern uint8_t ledOut[]; //[NUM_LIN_LEDS*3]
+extern uint8_t RootNoteOffset; //Set to define what the root note is.  0 = A.
 void UpdateLinearLEDs();
 
 uint32_t ECCtoHEX( uint8_t note, uint8_t sat, uint8_t val );

embeddedstm32f407/Makefile

@@ -46,6 +46,8 @@ SRC = main.c \
 	$(STLIB)/src/misc.c \
 	$(STLIB)/src/stm32f4xx_dma.c \
 	$(STLIB)/src/stm32f4xx_spi.c \
+	$(STLIB)/src/stm32f4xx_syscfg.c \
+	$(STLIB)/src/stm32f4xx_exti.c \
 	$(STLIB)/src/stm32f4xx_rcc.c \
 	$(STLIB)/src/stm32f4xx_gpio.c \
 	../embeddedcommon/DFT32.c \

embeddedstm32f407/main.c

@@ -1,31 +1,37 @@
+//ColorChordEmbedded implementation on the STM32F407 for the stm32f4-discovery.
+//Uses on-board microphone and outputs WS2812 signal for configurable number of LEDs
+//on PB5 via DMA+SPI
+
 #include <stdint.h>
 #include <stdio.h>
 #include <systems.h>
 #include <math.h>
-#include "mp45dt02.h"
-
+#include <stm32f4xx_exti.h>
 #include <DFT32.h>
 #include <embeddednf.h>
 #include <embeddedout.h>
+#include "mp45dt02.h"
+
+volatile int wasclicked = 0; //Used for if the root change button was clicked.
 
 RCC_ClocksTypeDef RCC_Clocks;
 
-#define CIRCBUFSIZE 256
 
+//Circular buffer for incoming data so we don't spend much time servicing the interrupt and we can handle colorchord in the main thread.
+#define CIRCBUFSIZE 256
 volatile int last_samp_pos;
 int16_t sampbuff[CIRCBUFSIZE];
 volatile int samples;
 
+//This gets called by the ADC/Microphone
 void GotSample( int samp )
 {
-//	lastsamp = samp;
 	sampbuff[last_samp_pos] = samp;
 	last_samp_pos = ((last_samp_pos+1)%CIRCBUFSIZE);
 	samples++;
 }
 
-
-
+//Call this once we've stacked together one full colorchord frame.
 void NewFrame()
 {
 	uint8_t led_outs[NUM_LIN_LEDS*3];
@@ -37,6 +43,61 @@ void NewFrame()
 }
 
 
+void Configure_PA0(void) {
+    /* Set variables used */
+    GPIO_InitTypeDef GPIO_InitStruct;
+    EXTI_InitTypeDef EXTI_InitStruct;
+    NVIC_InitTypeDef NVIC_InitStruct;
+    
+    /* Enable clock for GPIOD */
+    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
+    /* Enable clock for SYSCFG */
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
+    
+    /* Set pin as input */
+    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
+    GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
+    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
+    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_DOWN;
+    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
+    GPIO_Init(GPIOA, &GPIO_InitStruct);
+    
+    /* Tell system that you will use PA0 for EXTI_Line0 */
+    SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
+    
+    /* PA0 is connected to EXTI_Line0 */
+    EXTI_InitStruct.EXTI_Line = EXTI_Line0;
+    /* Enable interrupt */
+    EXTI_InitStruct.EXTI_LineCmd = ENABLE;
+    /* Interrupt mode */
+    EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
+    /* Triggers on rising and falling edge */
+    EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising;
+    /* Add to EXTI */
+    EXTI_Init(&EXTI_InitStruct);
+ 
+    /* Add IRQ vector to NVIC */
+    /* PA0 is connected to EXTI_Line0, which has EXTI0_IRQn vector */
+    NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn;   
+    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00; /* Set priority */
+    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x00;     /* Set sub priority */
+    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;   /* Enable interrupt */
+    NVIC_Init(&NVIC_InitStruct);     /* Add to NVIC */
+}
+
+//Handle button press on PA0.
+void EXTI0_IRQHandler(void)
+{
+	static int rootoffset;
+
+    if (EXTI_GetITStatus(EXTI_Line0) != RESET)
+	{
+		if( wasclicked == 0 )
+			wasclicked = 10;
+        EXTI_ClearITPendingBit(EXTI_Line0);
+    }
+}
+
 int main(void)
 {  
 	uint32_t i = 0;
@@ -47,14 +108,16 @@ int main(void)
 
 	LED_OFF;
 
-	/* SysTick end of count event each 10ms */
+	// SysTick end of count event each 10ms
 	SysTick_Config( RCC_Clocks.HCLK_Frequency / 100);
 
 	float fv = RCC_Clocks.HCLK_Frequency / 1000000.0f;
+//	We can use printf to print back through the debugging interface, but that's slow and
+//  it also takes up a bunch of space.  No printf = no space wasted in printf.
 //	printf( "Operating at %.3fMHz\n", fv );
 
 	Init();
-
+	Configure_PA0();
 	InitMP45DT02();
 	InitSPI2812();
 
@@ -66,7 +129,7 @@ int main(void)
 
 		if( this_samp != last_samp_pos )
 		{
-			LED_OFF;
+			LED_OFF; //Use led on the board to show us how much CPU we're using. (You can also probe PB15)
 
 			PushSample32( sampbuff[this_samp]/2 ); //Can't put in full volume.
 
@@ -86,19 +149,19 @@ int main(void)
 
 void TimingDelay_Decrement()
 {
-	static int i;
-	static int k;
-	int j;
+	static int rootoffset;
 
-/*	uint8_t obuf[16*3];
-	for( j = 0; j < 16; j++ )
+	//A way of making sure we debounce the button.
+	if( wasclicked )
 	{
-		obuf[j*3+0] = (sampbuff[j]>0)?sampbuff[j]/256:0 ;//(sampbuff[0]&(1<<j))?0xf:0x00;//lastsamppos+10;
-		obuf[j*3+1] = (sampbuff[j]<0)?sampbuff[j]/-256:0;
-		obuf[j*3+2] = 0;
+		if( wasclicked == 10 )
+		{
+			if( rootoffset++ >= 12 ) rootoffset = 0;
+			RootNoteOffset = (rootoffset * NOTERANGE) / 12;
+		}
+
+		wasclicked--;
 	}
-	k++;
-	SendSPI2812( obuf, 16 );*/
 
 }