commit 7af260dceab82781214ac7fbac9e67e5084d0880
Author: Stefan Rupp <struppi@struppi.name>
Date:   Sat Mar 1 03:50:09 2014 +0100

    init

diff --git a/.hgignore b/.hgignore
new file mode 100644
index 0000000..5d126dc
--- /dev/null
+++ b/.hgignore
@@ -0,0 +1,7 @@
+syntax: glob
+
+*.o
+*.map
+*.elf
+*.hex
+
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b53b79f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,41 @@
+PRG            = rgbyteclock
+OBJ            = rgbyteclock.o timer.o lcd.o main.o
+MCU_TARGET     = atmega16
+OPTIMIZE       = -Os
+
+DEFS           =
+LIBS           =
+
+CC             = avr-gcc
+
+override CFLAGS        = -g -Wall $(OPTIMIZE) -DF_CPU=16000000UL -std=gnu99 -mmcu=$(MCU_TARGET) $(DEFS)
+override LDFLAGS       = -Wl,-Map,$(PRG).map
+
+OBJCOPY        = avr-objcopy
+OBJDUMP        = avr-objdump
+SIZE           = avr-size -A
+
+
+all: $(PRG).hex
+
+$(PRG).elf: $(OBJ)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
+	@echo
+	@$(SIZE) $@ 
+	@echo
+
+# dependency:
+rgbyteclock.o: timer.o lcd.o rgbyteclock.h
+main.o: rgbyteclock.o
+timer.o:timer.h
+lcd.o: lcd.h
+
+clean:
+	rm -rf *.o $(PRG).elf *.eps *.png *.pdf *.bak 
+	rm -rf *.lst *.map $(EXTRA_CLEAN_FILES)
+
+hex:  $(PRG).hex
+
+%.hex: %.elf
+	$(OBJCOPY) -j .text -j .data -O ihex $< $@
+
diff --git a/lcd.c b/lcd.c
new file mode 100644
index 0000000..1a273aa
--- /dev/null
+++ b/lcd.c
@@ -0,0 +1,203 @@
+/*
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * Martin Wenger <martin.wenger@arcormail.de> and Stefan Rupp <struppi@struppi.name>
+ * wrote this file. As long as you retain this notice you can do whatever you want
+ * with this stuff. If we meet some day, and you think this stuff is worth it,
+ * you can buy me/us a beer in return.
+ * (c) 2005-2010 Martin Wenger, Stefan Rupp
+ * (c) 2014 Stefan Rupp
+ */
+
+#include <avr/io.h>
+#include <inttypes.h>
+#include <string.h>
+#include <compat/ina90.h>    // ==> _NOP()
+
+#include "timer.h"
+#include "lcd.h"
+
+#define WAIT_250_ns()       _NOP()
+
+#define LCD_DATA_MODE()     (PORTC |=  (1<<PC4))
+#define LCD_CMD_MODE()      (PORTC &= ~(1<<PC4))
+
+#define LCD_SET_ENABLE()    (PORTC |=  (1<<PC5))
+#define LCD_RESET_ENABLE()  (PORTC &= ~(1<<PC5))
+
+// !!!!!!!
+#define LCD_SET_READ()      DDRC &= ~(0x0f);PORTC &= ~(0x0f);PORTB |= (1<<PB0)
+#define LCD_SET_WRITE()     PORTB &= ~(1<<PB0);DDRC |= 0x0f
+#define LCD_BUSY_FLAG       (0x80)
+// !!!!!!!
+
+
+
+static inline uint8_t lcd_read_byte(uint8_t RS)
+{
+  uint8_t byte;
+
+  if (RS)
+    LCD_DATA_MODE();
+  else
+    LCD_CMD_MODE();
+
+  LCD_SET_READ();
+  
+  LCD_SET_ENABLE();
+  WAIT_250_ns();
+  byte = (PINC<<4);
+  LCD_RESET_ENABLE();
+  
+  WAIT_250_ns();
+  WAIT_250_ns();
+  
+  LCD_SET_ENABLE();
+  WAIT_250_ns();
+  byte |= PINC & 0x0f;
+  LCD_RESET_ENABLE();
+  
+  return byte;  
+}
+
+
+static inline void lcd_wait_while_busy(void)
+{
+  
+  uint8_t byte;
+  do {
+    byte = lcd_read_byte(0);
+  } while (byte & LCD_BUSY_FLAG);
+  return;
+}
+
+
+static inline void send_nibble(uint8_t nibble)
+{
+  LCD_SET_WRITE();
+  PORTC = (PORTC & 0xf0) | (0x0f & nibble);
+  LCD_SET_ENABLE();
+  WAIT_250_ns();
+  LCD_RESET_ENABLE();
+}
+
+
+/**
+  * Send one byte to the LCD
+  * \param byte The byte to send to the LCD
+  * \param RS specifies whether byte sent is data (RS==1) or command (RS==0)
+  */
+static inline void lcd_send_byte(uint8_t byte, uint8_t RS)
+{
+  lcd_wait_while_busy();
+  if (RS)
+    LCD_DATA_MODE();
+  else
+    LCD_CMD_MODE();
+
+  send_nibble(byte >> 4);
+  _NOP();
+  send_nibble(0x0f & byte);
+}
+
+
+int lcd_get(void)
+{
+  lcd_wait_while_busy();
+  return lcd_read_byte(1);
+
+}
+
+int lcd_put(char c)
+{
+  lcd_send_byte(c, 1);
+  return 0;
+}
+
+void lcd_puts(char *s)
+{
+  while (*s) {
+    //lcd_put(*s++);
+    lcd_send_byte(*s++, 1);
+  }
+}
+
+void lcd_cursor(uint8_t blink)
+{
+  if (blink) {
+    // enable display with cursor + blinking
+    lcd_send_byte(0x0f, 0);
+  }
+  else  {
+    // enable display, no cursor, no blinking
+    lcd_send_byte(0x0c, 0);
+  return;
+  }
+}
+
+void lcd_init(void)
+{
+  /* Initialize both ATmega and Dsiplay
+   * After return from this function,
+   * display we be set to 4-bit data mode
+   */
+  
+  // wait until LCD gets ready to accept instructions.
+  timer_wait(50);
+
+  // set CONTROL Pins as outputs:
+  DDRC = 0x3f;
+  DDRB |= (1<<PB0);
+
+  LCD_CMD_MODE();
+  LCD_SET_WRITE();
+
+  // set LCD to 8-bit mode
+  send_nibble(0x03);
+  
+  timer_wait(5);
+  send_nibble(0x03);
+  
+  timer_wait(5);
+  send_nibble(0x03);
+  
+  // LCD definitely is in 8-bit mode now
+  
+  // set module to 4-bit mode now
+  // Remember! As we're in 8-bit mode now,
+  // send_nibble is the right thing, not send_byte!
+  timer_wait(5);
+  send_nibble(0x02);
+  timer_wait(5);
+
+  // set to 5 x 8 dots per character,
+  // 16 characters per line, 2 lines
+  lcd_send_byte(0x28, 0);
+
+  // enable display, no cursor, no blinking
+  //lcd_send_byte(0x0c, 0);
+  // enable display with cursor + blinking
+  //lcd_send_byte(0x0f, 0);
+  lcd_cursor(1);
+  
+  // Set display to
+  // + Move cursor (and do not shift display)
+  // + Move right
+  lcd_send_byte(0x04, 0);
+  
+  // clear dislay
+  lcd_clear();
+ 
+  return;
+}
+
+void lcd_clear(void)
+{
+  lcd_send_byte(0x01, 0);
+}
+
+void lcd_locate(uint8_t row, uint8_t col)
+{
+  if (row)
+    col += 0x40;
+  lcd_send_byte(0x80 + col, 0);
+}
diff --git a/lcd.h b/lcd.h
new file mode 100644
index 0000000..ea6efa0
--- /dev/null
+++ b/lcd.h
@@ -0,0 +1,14 @@
+#if !defined  __LCD_H
+#define __LCD_H
+
+#include <inttypes.h>
+
+void lcd_init(void);
+int lcd_put(char c);
+void lcd_puts(char *s);
+int lcd_get(void);
+void lcd_clear(void);
+void lcd_locate(uint8_t row, uint8_t column);
+void lcd_cursor(uint8_t blink);
+
+#endif
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..ee0d114
--- /dev/null
+++ b/main.c
@@ -0,0 +1,19 @@
+
+
+#include <avr/io.h>
+#include "timer.h"
+#include "lcd.h"
+#include "rgbyteclock.h"
+
+
+int main(void)
+{
+  
+  timer_init();
+  lcd_init();
+
+  rgbyteclock();
+  // rgbyteclock() should never end, but who knows...
+  while (1) { ; }
+
+}
diff --git a/rgbyteclock.c b/rgbyteclock.c
new file mode 100644
index 0000000..26c657a
--- /dev/null
+++ b/rgbyteclock.c
@@ -0,0 +1,15 @@
+
+
+#include "rgbyteclock.h"
+
+
+
+void rgbyteclock(void)
+{
+
+
+  while(1) {
+
+  }
+
+}
diff --git a/rgbyteclock.h b/rgbyteclock.h
new file mode 100644
index 0000000..a71f50a
--- /dev/null
+++ b/rgbyteclock.h
@@ -0,0 +1,15 @@
+
+#ifndef RGBYTECLOCK_H
+#define RGBYTECLOCK_H
+
+#include <avr/io.h>
+#include "timer.h"
+#include "lcd.h"
+
+
+void rgbyteclock(void);
+
+
+
+#endif // RGBYTECLOCK_H
+
diff --git a/timer.c b/timer.c
new file mode 100644
index 0000000..ca9cec2
--- /dev/null
+++ b/timer.c
@@ -0,0 +1,163 @@
+/*
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * Martin Wenger <martin.wenger@arcormail.de> and Stefan Rupp <struppi@struppi.name>
+ * wrote this file. As long as you retain this notice you can do whatever you want
+ * with this stuff. If we meet some day, and you think this stuff is worth it,
+ * you can buy me/us a beer in return.
+ * (c) 2005-2010 Martin Wenger, Stefan Rupp
+ * (c) 2013,2014 Stefan Rupp
+ */
+ 
+#include <avr/io.h>
+#include "timer.h"
+#include <stdlib.h>
+#include <avr/interrupt.h>
+
+
+/* timer_time gets increased on every interrupt
+ * those interrupts happen every 1ms
+ */
+static volatile uint32_t timer_time;
+
+ISR(TIMER0_COMP_vect) {
+  ++timer_time;
+  return;
+}
+
+/**
+ * Initialize the timer
+ * This function has to be called first, before calling timer_wait and/or timer_get,
+ * else timer_get will always return 0, and timer_wait will wait forever!
+ */
+
+void timer_init(void)
+{
+  // Stop all interrupts
+  cli();
+
+  // Reset timer to zero
+  timer_time = 0;
+  
+  // - Time accuracy: 1 millisecond (corresponding frequency: 1kHz)
+  // ==> F_CPU = 2Mhz
+  // ==> 16Mhz / 64 = 250 kHz
+  // ==> let timer count to 250 to get 1kHz frequency
+  // therefore:
+  // - Set Timer/Counter0 prescaler to 64 ==> (1<<CS01)|(1<<CS00)
+  // - Set OCR2 to 249
+  // - CTC ( i.e. clear counter, when COUNTER == OCR0A) ==> (1<<WGM01)
+  OCR0 = 249;
+  TCCR0 = (1<<CS01)|(1<<CS00)|(1<<WGM01);
+  
+  // Interrupts setzen
+  TIMSK |= (1<<OCIE0);
+
+  // Allow interrupts
+  sei();
+}
+
+
+/**
+ * Get the current time
+ * \return the current time (in ms)
+ */
+inline uint32_t timer_get(void)
+{
+  uint32_t t;
+  uint8_t sreg;
+
+  sreg = SREG;
+  cli();
+  t = timer_time;
+  SREG = sreg;
+  return t;
+}
+
+/**
+ * Wait for (at least) the specified amount of time
+ * \param delay The time to wait (in ms)
+ */
+
+void timer_wait(uint32_t delay)
+{
+  uint32_t end = timer_get() + delay +1;
+  while ( end > timer_get() );
+  return;
+}
+
+/**
+ * Decode a integer timestamp (in microseconds)
+ * into hours, minutes, seconds, microseconds
+ * \param time the time in microseconds
+ * \param hours will be filled in to contain the hours after return
+ * \param minutes will be filled in to contain the minutes after return
+ * \param seconds will be filled in to contain the seconds after return
+ * \param ms be filled in to contain the microseconds after return
+ */
+void timer_decode(uint32_t time, uint8_t *hours, uint8_t *minutes, uint8_t *seconds, uint16_t *ms)
+{
+  if (ms != NULL) {
+    *ms = time % 1000;
+  }
+  time /= 1000;
+  if (seconds != NULL) {
+    *seconds = time % 60;
+  }
+  time /= 60;
+  if (minutes != NULL) {
+    *minutes = time % 60;
+  }
+  time /= 60;
+  if (hours != NULL) {
+    *hours = time;
+  }
+  return;
+}
+
+/**
+ * Encode a time given as hours, minutes, seconds and microsecods into a integer storing micorseconds
+ * \param time the variable to store the time into
+ * \param hour the hours to store
+ * \param hour the minutes to store
+ * \param hour the seconds to store
+ * \param hour the microseconds to store
+ */
+void timer_encode(uint32_t *time, uint8_t hours, uint8_t minutes, uint8_t seconds, uint16_t ms)
+{
+
+  *time = hours;
+  *time *= 60;
+
+  *time += minutes;
+  *time *= 60;
+
+  *time += seconds;
+  *time *= 1000U;
+
+  *time += ms;
+
+  return;
+}
+
+/*
+void timer_validate(uint8_t *hours, uint8_t *minutes, uint8_t *seconds, uint16_t *ms)
+{ 
+
+  while (*ms >= 1000) {
+    *ms -= 1000;
+    (*seconds)++;
+  }
+
+  while (*seconds >= 60) {
+    *ms -= 60;
+    (*minutes)++;
+  }
+
+  while (*minutes >= 60) {
+    *minutes -= 60;
+    (*hours)++;
+  }
+
+  return;
+}
+*/
diff --git a/timer.h b/timer.h
new file mode 100644
index 0000000..1015d7b
--- /dev/null
+++ b/timer.h
@@ -0,0 +1,12 @@
+#if !defined __TIMER_H
+#define __TIMER_H
+
+#include <inttypes.h>
+
+void timer_wait(uint32_t delay);
+uint32_t timer_get(void);
+void timer_init(void);
+void timer_decode(uint32_t time, uint8_t *hours, uint8_t *minutes, uint8_t *seconds, uint16_t *ms);
+void timer_encode(uint32_t *time, uint8_t hour, uint8_t minute, uint8_t seconds, uint16_t ms);
+
+#endif