add edge detection code

io-helper.c

@@ -1,10 +1,23 @@
 #include <avr/io.h>
 #include "io-helper.h"
 
-volatile uint8_t outStates[nrOfOutputs/8];
+volatile uint8_t outStates[]={0,0,0,0};
-volatile uint8_t inStatesRaw[nrOfInputs/8];
+volatile uint8_t inStatesRaw[] = {0,0,0,0};
-volatile uint8_t inStates[nrOfInputs/8];
+volatile uint8_t inStates[] = {0,0,0,0};
-volatile uint8_t oldInstates[nrOfInputs/8];
+
+volatile uint8_t oldInstates[] = {0,0,0,0};
+volatile uint8_t inStatesBothEdges[] = {0,0,0,0};
+volatile uint8_t inStatesRisingEdge[] = {0,0,0,0};
+volatile uint8_t inStatesFallingEdge[] = {0,0,0,0};
+
+void ioHelperEdgeDetector(void){
+    for (uint8_t i = 0; i < 4; i++){
+        inStatesBothEdges[i] = oldInstates[i] ^ inStates[i];
+        inStatesRisingEdge[i] = inStatesBothEdges[i] & inStates[i];
+        inStatesFallingEdge[i] = inStatesBothEdges[i] & oldInstates[i];
+        oldInstates[i] = inStates[i];
+    }
+}
 
 
 /* @brief: copies a single bit from one char to another char (or arrays thereof)
@@ -18,12 +31,12 @@ void ioHelperCpArb(volatile uint8_t *source, uint16_t sourceNr,volatile uint8_t
 	} else *(target+(targetNr/8))&=~(1<<(targetNr-((targetNr/8)*8)));
 }
 
-volatile uint8_t ioHelperDebounceTable[nrOfInputs];
+volatile uint8_t ioHelperDebounceTable[32];
 
 /* debounceing: */
 void ioHelperDebounce(void) {
 	static volatile uint8_t tablePos=0; 
-	for(uint8_t i = 0; i<nrOfInputs; i++) {
+	for(uint8_t i = 0; i<16; i++) {
 		ioHelperCpArb(inStatesRaw,i,ioHelperDebounceTable,i*8+tablePos);
 		if(ioHelperDebounceTable[i]==0) ioHelperSetBit(inStates,i,0);
 		else if(ioHelperDebounceTable[i]==0xFF) ioHelperSetBit(inStates,i,1);
@@ -69,17 +82,6 @@ uint8_t getBit0(uint8_t bit) {
 //}
 
 void ioHelperIoConf(void) {
-    for(uint8_t x=0; x<nrOfInputs; x++) {
-        ioHelperDebounceTable[x]=0;
-    }
-    for(uint8_t x=0; x<nrOfInputs/8; x++) {
-        inStates[x]=0;
-        inStatesRaw[x]=0;
-    }
-    for(uint8_t x=0; x<nrOfOutputs/8; x++) {
-        outStates[x]=0;
-    }
-
 #ifdef DDRA
 DDRA|=0 
 #ifdef BitPA0

io-helper.h

@@ -1,21 +1,23 @@
 #ifndef _IO_HELPER_
 #define _IO_HELPER_
 
-#include <avr/io.h>
+#include <stdint.h>
 
-#define nrOfOutputs 32 //must be multiple of 8
+extern volatile uint8_t outStates[4]; 
-#define nrOfInputs 32 //must be multiple of 8
+extern volatile uint8_t inStates[4];
+extern volatile uint8_t ioHelperDebounceTable[32];
+extern volatile uint8_t oldInstates[4];
+extern volatile uint8_t inStatesBothEdges[4];
+extern volatile uint8_t inStatesRisingEdge[4];
+extern volatile uint8_t inStatesFallingEdge[4];
 
-extern volatile uint8_t outStates[nrOfOutputs/8]; 
-extern volatile uint8_t inStates[nrOfInputs/8];
-extern volatile uint8_t ioHelperDebounceTable[nrOfInputs];
 void ioHelperSetOuts(void);
 void ioHelperReadPins(void);
 void ioHelperIoConf(void);
 void ioHelperSetBit(volatile uint8_t *list, uint8_t nr, uint8_t state);
 unsigned char ioHelperReadBit(volatile uint8_t *list, uint8_t nr);
 void ioHelperDebounce(void);
-
+void ioHelperEdgeDetector(void);
 
 //Outputs
 //Pin | Bit in outStates