Started implementing EEPROM writer/reader for AT28C256.

at28c256/at28c256.c

@@ -0,0 +1,34 @@
+#include "at28c256.h"
+#include "../ard/pins.h"
+
+unsigned char _addrck, _addr;
+
+void at28c256_init(unsigned char addrck, unsigned char addr) {
+	pin_mode(addrck, OUTPUT);
+	digital_write(addrck, LOW); // disable
+	pin_mode(addr, OUTPUT);
+	digital_write(addr, LOW); // disable
+	
+    _addrck = addrck;
+	_addr = addr;
+}
+
+void at28c256_write(unsigned short addr, unsigned char data) {
+    // set the address
+    unsigned int i;
+
+    for(i = 0; i < 16; i++) {
+        if(addr & (1 << (15-i))) {
+            digital_write(_addr, HIGH);
+        } else {
+            digital_write(_addr, LOW);
+        }
+
+        digital_write(_addrck, HIGH);
+        digital_write(_addrck, LOW);
+    }
+
+    digital_write(_addr, LOW);
+
+    // TODO write data
+}

at28c256/at28c256.h

@@ -0,0 +1,8 @@
+#ifndef AT28C256_H_
+#define AT28C256_H_
+
+void at28c256_init(unsigned char, unsigned char);
+void at28c256_write(unsigned short, unsigned char);
+//unsigned char at28c256_read(unsigned short); TODO
+
+#endif

compile.sh

@@ -15,6 +15,7 @@ rm -rf build || true
 mkdir build
 
 # compile files
+avr-gcc -Os -DF_CPU=16000000UL -mmcu=$MMCU -c -o build/at28c256.o -Wall at28c256/at28c256.c
 avr-gcc -Os -DF_CPU=16000000UL -mmcu=$MMCU -c -o build/servo.o -Wall servo/servo.c
 avr-gcc -Os -DF_CPU=16000000UL -mmcu=$MMCU -c -o build/rf24.o -Wall rf24/rf24.c
 avr-gcc -Os -DF_CPU=16000000UL -mmcu=$MMCU -c -o build/util.o -Wall ard/util.c

main.c

@@ -2,7 +2,7 @@
 #include <stdio.h>
 #include "ard/serial.h"
 #include "ard/pins.h"
-#include "ard/util.h"
+#include "at28c256/at28c256.h"
 
 void prepare();
 void loop();
@@ -18,12 +18,12 @@ int main(){
 void prepare(){
 	pins_init();
 	serial_init(9600);
-	pin_mode(13, OUTPUT);
+	at28c256_init(2, 13);
 }
 
 void loop(){
-	digital_write(13, LOW);
+	at28c256_write(0x0001, 0);
+	_delay_ms(1000);
+	at28c256_write(0x8000, 0);
 	_delay_ms(1000);
-	digital_write(13, HIGH);
-	_delay_us(1000000);
 }

rf24/rf24.c

@@ -1,10 +1,8 @@
+#include <util/delay.h>
 #include "rf24.h"
 #include "nRF24L01.h"
 #include "../ard/pins.h"
 
-// FIXME for testing, remove later
-#include <util/delay.h>
-
 #define CONFIG_CRC (1<<EN_CRC)|(0<<CRCO)
 
 unsigned char _ce, _csn, _sck, _mo, _mi, _irq, _payload_len;