From e22453c44e0b88f47cd16f6dd1a769bd4ff90203 Mon Sep 17 00:00:00 2001
From: Max Christian Pohle
Date: Sat, 20 May 2017 19:08:44 +0200
Subject: First prototype version: Just shift register usage.

---
 Makefile |   6 +++
 main.c   | 164 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 170 insertions(+)
 create mode 100644 Makefile
 create mode 100644 main.c

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e8d2720
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,6 @@
+all:
+	avr-gcc -Wall  -mmcu=attiny85 -O3 -o main.elf main.c
+	avr-objcopy -j .text -j .data -O ihex main.elf main.hex
+
+program: all
+	avrdude -B100 -p t85 -c avrisp2 -P usb -U flash:w:main.hex
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..7906126
--- /dev/null
+++ b/main.c
@@ -0,0 +1,164 @@
+#include <avr/io.h>          // (1)
+#include <avr/interrupt.h>
+
+#ifndef F_CPU
+#warning "F_CPU war noch nicht definiert, wird nun mit 3686400 definiert"
+// #define F_CPU 3686400UL     /* Quarz mit 3.6864 Mhz */
+#define F_CPU 1000000UL     /* Quarz mit 3.6864 Mhz */
+#endif
+
+#include <util/delay.h>
+#include <stdint.h>
+
+
+// set bit
+static inline void BIT_SET(volatile uint8_t *target, uint8_t bit) __attribute__((always_inline));
+static inline void BIT_SET(volatile uint8_t *target, uint8_t bit){
+  *target |= (1<<bit);
+};
+
+// set clear
+static inline void BIT_CLEAR(volatile uint8_t *target, uint8_t bit) __attribute__((always_inline));
+static inline void BIT_CLEAR(volatile uint8_t *target, uint8_t bit){
+  *target &= ~(1<<bit);
+};
+
+///* -----------------------------------------------------------------------------------------------------------*/
+///*! Eine schnelle MEM->SPI Blocksende Routine mit optimierungen auf Speed.
+// * \param  buffer    Zeiger auf den Puffer der gesendet werden soll.
+// * \param  Datalenght  Anzahl der Bytes die gesedet werden soll.
+// */
+///* -----------------------------------------------------------------------------------------------------------*/
+//void SPI_FastMem2Write( unsigned char * buffer, unsigned int Datalenght )
+//{
+//  unsigned int Counter = 0;
+//  unsigned char data;
+//
+//  // erten Wert senden
+//  SPDR = buffer[ Counter++ ];
+//  while( Counter < Datalenght )
+//  {
+//    // Wert schon mal in Register holen, schneller da der Wert jetzt in einem Register steht und nicht mehr aus dem RAM geholt werden muss
+//    // nachdem das senden des vorherigen Wertes fertig ist,
+//    data = buffer[ Counter ];
+//    // warten auf fertig
+//    while(!(SPSR & (1<<SPIF)));
+//    // Wert aus Register senden
+//    SPDR = data;
+//    Counter++;
+//  }
+//  while(!(SPSR & (1<<SPIF)));
+//  return;
+//}
+uint8_t spi_transfer(uint8_t data) {
+  USIDR = data;
+  USISR = _BV(USIOIF); // clear flag
+
+  while ( (USISR & _BV(USIOIF)) == 0 ) {
+    USICR = (1<<USIWM0)|(1<<USICS1)|(1<<USICLK)|(1<<USITC);
+  }
+  return USIDR;
+}
+
+void pulse_sck()
+{
+  PORTB |= ( 1 << PB2 );
+  _delay_ms(10);        // Eine Sekunde +/-1/10000 Sekunde warten...
+  PORTB ^= ( 1 << PB2 );
+}
+
+void print_data(uint16_t data)
+{
+  BIT_CLEAR(&PORTB, PB4);
+  _delay_ms(100);
+  BIT_SET(&PORTB, PB4);
+
+  for(int i=0; i<16; i++)
+  {
+    if(data<<i & 0b1000000000000000)
+      BIT_SET(&PORTB, PB4);
+    pulse_sck();
+    BIT_CLEAR(&PORTB, PB4);
+    //PORTB &= (1 << PB4);
+  }
+  //pulse_sck();
+
+
+  BIT_CLEAR(&PORTB, PB3);
+  _delay_ms(50);
+  BIT_SET(&PORTB, PB3);
+}
+
+
+int main (void) {
+
+  //DDRB |= _BV(PB4); // as output (latch)
+  //DDRB |= _BV(PB6); // as output (DO) - data out
+  //DDRB |= _BV(PB7); // as output (USISCK) - clock
+  _delay_ms(1000);
+  // DDRB   = (1<<PB0) | (1<<PB2) | (1<<PB3) | (1<<PB4) | (1<<PB5);  // PB0 an PORTB als Ausgang setzen
+  DDRB   = 0xFF;
+
+
+  BIT_CLEAR(&PORTB, PB5);
+  _delay_ms(500);
+  BIT_SET(&PORTB, PB5);
+  BIT_CLEAR(&PORTB, PB5);
+  _delay_ms(500);
+  BIT_SET(&PORTB, PB5);
+  //DDRB  &= ~_BV(PB5);     // as input (DI) - data in
+  //PORTB |= _BV(PB5);      // pullup on (DI)
+
+  while( 1 )
+  {                // Endlosschleife
+
+    _delay_ms(1000);        // Eine Sekunde +/-1/10000 Sekunde warten...
+
+
+    // char data = 0b10101010;
+    // char data = 0b11001101;
+    // char data = 0b10101100;
+    //
+    //
+    //
+    //
+    //
+    //
+    //
+    //
+
+    print_data(0x0001);
+    print_data(0x0002);
+    print_data(0x0004);
+    print_data(0x0008);
+    print_data(0x000F);
+    print_data(0xFF00);
+    print_data(0x00FF);
+    print_data(0xFF00);
+    print_data(0x00FF);
+    print_data(0xFF00);
+
+    uint16_t data;
+    for(int i=0; i<16; i++)
+      print_data(1<<i);
+    for(int i=0; i<16; i++)
+      print_data(0X8000>>i);
+
+    /*
+
+    char data = 1;
+    for(; data<128; data++)
+    {
+      // clear register (reset)
+      print_data(data);
+      _delay_ms(1000);
+    }
+
+    */
+
+    // spi_transfer(0x10101010b);
+
+
+  }
+  return 0;
+}
-- 
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