Started implementing EEPROM writer/reader for AT28C256.

ard/pins.c

@@ -20,7 +20,7 @@ const unsigned char A7 = 0x15;
 void analog_read_duty_cycle();
 unsigned char map_analog_pin(unsigned char);
 
-void pins_init(){
+void pins_init() {
 	sei();
 
 	// enable ADC (128 bit ADPS scaling factor 0x07) to read analog values
@@ -37,7 +37,7 @@ void pins_init(){
 	TIMSK2 |= _BV(TOIE2);
 }
 
-void pin_mode(unsigned char pin, unsigned char mode){
+void pin_mode(unsigned char pin, unsigned char mode) {
 	if(pin > A7){
 		return;
 	}
@@ -75,7 +75,7 @@ void pin_mode(unsigned char pin, unsigned char mode){
 	}
 }
 
-int digital_read(unsigned char pin){
+int digital_read(unsigned char pin) {
 	if(pin > A7){
 		return 0;
 	}
@@ -94,7 +94,7 @@ int digital_read(unsigned char pin){
 	return analog_read(pin) > 512 ? 1 : 0;
 }
 
-void digital_write(unsigned char pin, unsigned char value){
+void digital_write(unsigned char pin, unsigned char value) {
 	if(pin > A7){
 		return;
 	}
@@ -132,7 +132,7 @@ void digital_write(unsigned char pin, unsigned char value){
 	}
 }
 
-unsigned int analog_read(unsigned char pin){
+unsigned int analog_read(unsigned char pin) {
 	pin = map_analog_pin(pin);
 
 	if(pin > 7){
@@ -151,7 +151,7 @@ unsigned int analog_read(unsigned char pin){
 	return ADC;
 }
 
-void analog_write(unsigned char pin, unsigned char value){
+void analog_write(unsigned char pin, unsigned char value) {
 	// write digital if possible
 	if(value == 0){
 		digital_write(pin, LOW);
@@ -206,7 +206,7 @@ void analog_write(unsigned char pin, unsigned char value){
 }
 
 // maps A0-A7 to 0-7
-unsigned char map_analog_pin(unsigned char pin){
+unsigned char map_analog_pin(unsigned char pin) {
 	if(pin > 7){
 		return pin-A0;
 	}

ard/serial.c

@@ -1,7 +1,7 @@
 #include "serial.h"
 #include <avr/io.h>
 
-void serial_init(unsigned int baud){
+void serial_init(unsigned int baud) {
 	unsigned long baud_prescale = ((16000000UL/(baud*16UL)))-1;
 
 	// enable transmitter and receiver
@@ -15,7 +15,7 @@ void serial_init(unsigned int baud){
 	UBRR0L  = baud_prescale;
 }
 
-void serial_write(char* data, unsigned int n){
+void serial_write(char* data, unsigned int n) {
 	unsigned int i;
 
 	for(i = 0; i < n; i++){
@@ -27,7 +27,7 @@ void serial_write(char* data, unsigned int n){
 	}
 }
 
-void serial_read(char* data, unsigned int n){
+void serial_read(char* data, unsigned int n) {
 	unsigned int i;
 
 	for(i = 0; i < n; i++){

ard/util.c

@@ -1,5 +1,5 @@
 #include "util.h"
 
-float map(float value, float fromLow, float fromHigh, float toLow, float toHigh){
+float map(float value, float fromLow, float fromHigh, float toLow, float toHigh) {
 	return fromLow+((toHigh-toLow)/(fromHigh-fromLow))*(value-fromLow);
 }

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;
@@ -15,7 +13,7 @@ unsigned char rf24_fifo_empty();
 void rf24_serial_transmit(unsigned char*, unsigned char);
 unsigned char rf24_serial_write(unsigned char);
 
-void rf24_init(unsigned char ce, unsigned char csn, unsigned char sck, unsigned char mo, unsigned char mi, unsigned char irq){
+void rf24_init(unsigned char ce, unsigned char csn, unsigned char sck, unsigned char mo, unsigned char mi, unsigned char irq) {
 	pin_mode(ce, OUTPUT);
 	digital_write(ce, LOW); // disable
 	pin_mode(csn, OUTPUT);
@@ -34,7 +32,7 @@ void rf24_init(unsigned char ce, unsigned char csn, unsigned char sck, unsigned
 }
 
 // channel in 1Mhz steps
-void rf24_config(unsigned char channel, unsigned char payload_len){
+void rf24_config(unsigned char channel, unsigned char payload_len) {
 	_payload_len = payload_len;
 
 	rf24_config_register(RF_CH, channel&RF_CH_MASK); // 2.4Ghz + channel*1Mhz
@@ -58,14 +56,14 @@ void rf24_config(unsigned char channel, unsigned char payload_len){
 	rf24_rx();
 }
 
-void rf24_rx_addr(unsigned char* addr){
+void rf24_rx_addr(unsigned char* addr) {
 	digital_write(_csn, LOW);
 	rf24_serial_write(W_REGISTER|RX_ADDR_P1); // data pipe
 	rf24_serial_transmit(addr, 5);
 	digital_write(_csn, HIGH);
 }
 
-void rf24_tx_addr(unsigned char* addr){
+void rf24_tx_addr(unsigned char* addr) {
 	digital_write(_csn, LOW);
 	rf24_serial_write(W_REGISTER|RX_ADDR_P0); // auto ACK pipe address must match...
 	rf24_serial_transmit(addr, 5);
@@ -76,7 +74,7 @@ void rf24_tx_addr(unsigned char* addr){
 	digital_write(_csn, HIGH);
 }
 
-void rf24_rx(){
+void rf24_rx() {
 	digital_write(_csn, LOW);
 	rf24_serial_write(FLUSH_RX);
 	digital_write(_csn, HIGH);
@@ -88,17 +86,17 @@ void rf24_rx(){
 	digital_write(_ce, HIGH);
 }
 
-void rf24_tx(){
+void rf24_tx() {
 	rf24_config_register(STATUS, (1<<RX_DR)|(1<<TX_DS)|(1<<MAX_RT));
 	rf24_config_register(CONFIG, CONFIG_CRC|(1<<PWR_UP)|(0<<PRIM_RX));
 }
 
-void rf24_power_down(){
+void rf24_power_down() {
 	digital_write(_ce, LOW);
 	rf24_config_register(CONFIG, CONFIG_CRC);
 }
 
-void rf24_send(unsigned char* data){
+void rf24_send(unsigned char* data) {
 	digital_write(_ce, LOW);
 	rf24_tx();
 	digital_write(_csn, LOW);
@@ -111,12 +109,12 @@ void rf24_send(unsigned char* data){
 	digital_write(_ce, HIGH);
 }
 
-unsigned char rf24_is_sending(){
+unsigned char rf24_is_sending() {
 	unsigned char status = rf24_status();
 	return !(status&((1<<TX_DS)|(1<<MAX_RT)));
 }
 
-unsigned char rf24_data_ready(){
+unsigned char rf24_data_ready() {
 	unsigned char status = rf24_status();
 
 	if(status&(1<<RX_DR)){
@@ -126,7 +124,7 @@ unsigned char rf24_data_ready(){
 	return !rf24_fifo_empty();
 }
 
-void rf24_get_data(unsigned char* data){
+void rf24_get_data(unsigned char* data) {
 	digital_write(_csn, LOW);
 	rf24_serial_write(R_RX_PAYLOAD);
 	unsigned char i = 0;
@@ -139,21 +137,21 @@ void rf24_get_data(unsigned char* data){
 	rf24_config_register(STATUS, 1<<RX_DR);
 }
 
-unsigned char rf24_status(){
+unsigned char rf24_status() {
 	digital_write(_csn, LOW);
 	unsigned char status = rf24_serial_write(NOP); // returns STATUS register
 	digital_write(_csn, HIGH);
 	return status;
 }
 
-void rf24_config_register(unsigned char reg, unsigned char value){
+void rf24_config_register(unsigned char reg, unsigned char value) {
 	digital_write(_csn, LOW);
 	rf24_serial_write(W_REGISTER|(reg&REG_MASK));
 	rf24_serial_write(value);
 	digital_write(_csn, HIGH);
 }
 
-unsigned char rf24_read_register(unsigned char reg){
+unsigned char rf24_read_register(unsigned char reg) {
 	digital_write(_csn, LOW);
 	rf24_serial_write(R_REGISTER|(reg&REG_MASK));
 	unsigned char data = rf24_serial_write(NOP);
@@ -161,12 +159,12 @@ unsigned char rf24_read_register(unsigned char reg){
 	return data;
 }
 
-unsigned char rf24_fifo_empty(){
+unsigned char rf24_fifo_empty() {
 	unsigned char fifo = rf24_read_register(FIFO_STATUS);
 	return fifo&(1<<RX_EMPTY);
 }
 
-void rf24_serial_transmit(unsigned char* data, unsigned char len){
+void rf24_serial_transmit(unsigned char* data, unsigned char len) {
 	unsigned char i = 0;
 
 	for(i = 0; i < len; i++){
@@ -174,7 +172,7 @@ void rf24_serial_transmit(unsigned char* data, unsigned char len){
 	}
 }
 
-unsigned char rf24_serial_write(unsigned char data){
+unsigned char rf24_serial_write(unsigned char data) {
 	digital_write(_sck, LOW); // clock
 	unsigned char i = 0, rx = 0;