Add support for the franzis pingpong hardware

boards/pingpong.mk

@@ -0,0 +1,11 @@
+# Franzis Ping-Pong thing
+MCU_TARGET = atmega8
+MCU_FREQ = 8000000UL
+
+CPPFLAGS += -DFB_WIDTH=12 -DFB_HEIGHT=10 -DFB_DEPTH=1
+
+DRIVER_OBJ += drivers/franzis_pp.o
+
+AVRDUDE_TYPE = usbasp
+
+PROG ?= pingpong

drivers/framebuffer.c

@@ -0,0 +1,4 @@
+#define DONT_DECLARE_FRAMEBUFFER 1
+#include "framebuffer.h"
+
+FRAMEBUFFER;

drivers/framebuffer.h

@@ -0,0 +1,26 @@
+#include <stdint.h>
+
+#define CEILDIV(x, y) (((x)+((y)-1))/(y))
+
+#if FB_DEPTH==1
+
+#define FB_WIDTH_BYTES CEILDIV(FB_WIDTH, 8)
+#define FRAMEBUFFER uint8_t framebuffer[FB_HEIGHT][FB_WIDTH_BYTES];
+#define FB_SET(w,h,c) if (c) { \
+    framebuffer[h][w>>3] |= (1 << (w & 7)); \
+  } else { \
+    framebuffer[h][w>>3] &= ~(1 << (w & 7)); \
+  }
+#define FB_CLEAR() memset(framebuffer, 0, sizeof(framebuffer[0][0]) * FB_HEIGHT * FB_WIDTH_BYTES);
+
+#elif FB_DEPTH==8
+
+#define FRAMEBUFFER uint8_t framebuffer][FB_HEIGHT][FB_WIDTH];
+#define FB_SET(w,h,c) framebuffer[h][w] = c
+#define FB_CLEAR() memset(framebuffer, 0, sizeof(framebuffer[0][0]) * FB_HEIGHT * FB_WIDTH);
+
+#endif
+
+#ifndef DONT_DECLARE_FRAMEBUFFER
+extern FRAMEBUFFER
+#endif

drivers/franzis_pp.c

@@ -0,0 +1,91 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#include "franzis_pp.h"
+#include "framebuffer.h"
+
+void __attribute__ ((naked)) __attribute__ ((section (".init6"))) franzis_pingpong_init() {
+  ROW0_DDR |= (1 << ROW0_PIN);
+  ROW1_DDR |= (1 << ROW1_PIN);
+  ROW2_DDR |= (1 << ROW2_PIN);
+  ROW3_DDR |= (1 << ROW3_PIN);
+  ROW4_DDR |= (1 << ROW4_PIN);
+  ROW5_DDR |= (1 << ROW5_PIN);
+  ROW6_DDR |= (1 << ROW6_PIN);
+  ROW7_DDR |= (1 << ROW7_PIN);
+  ROW8_DDR |= (1 << ROW8_PIN);
+  ROW9_DDR |= (1 << ROW9_PIN);
+
+  COLS_DDR |= (1 << COLS_STR);
+  COLS_DDR |= (1 << COLS_DATA);
+  COLS_DDR |= (1 << COLS_CLK);
+
+  ROW2_PORT |= (1 << ROW2_PIN);
+
+  COLS_PORT |= (1 << COLS_CLK);
+
+  TCCR2 = (1 << CS22);
+  TIMSK = (1 << TOIE2);
+
+  sei();
+}
+
+void franzis_pingpong_push(uint16_t data) {
+  COLS_PORT |= (1 << COLS_STR);
+
+  uint8_t i;
+  for (i = 0; i<=11; i++) {
+    COLS_PORT &= ~(1 << COLS_CLK);
+    if (data & 1) {
+      COLS_PORT &= ~(1 << COLS_DATA);
+    } else {
+      COLS_PORT |= (1 << COLS_DATA);
+    }
+    COLS_PORT |= (1 << COLS_CLK);
+    data = data >> 1;
+  }
+
+  COLS_PORT &= ~(1 << COLS_STR);
+}
+
+void franzis_pingpong_clear_row() {
+  ROW0_PORT &= ~(1 << ROW0_PIN);
+  ROW1_PORT &= ~(1 << ROW1_PIN);
+  ROW2_PORT &= ~(1 << ROW2_PIN);
+  ROW3_PORT &= ~(1 << ROW3_PIN);
+  ROW4_PORT &= ~(1 << ROW4_PIN);
+  ROW5_PORT &= ~(1 << ROW5_PIN);
+  ROW6_PORT &= ~(1 << ROW6_PIN);
+  ROW7_PORT &= ~(1 << ROW7_PIN);
+  ROW8_PORT &= ~(1 << ROW8_PIN);
+  ROW9_PORT &= ~(1 << ROW9_PIN);
+}
+
+void franzis_pingpong_select_row(uint8_t row) {
+  switch(row) {
+  case 0: ROW0_PORT |= (1 << ROW0_PIN); break;
+  case 1: ROW1_PORT |= (1 << ROW1_PIN); break;
+  case 2: ROW2_PORT |= (1 << ROW2_PIN); break;
+  case 3: ROW3_PORT |= (1 << ROW3_PIN); break;
+  case 4: ROW4_PORT |= (1 << ROW4_PIN); break;
+  case 5: ROW5_PORT |= (1 << ROW5_PIN); break;
+  case 6: ROW6_PORT |= (1 << ROW6_PIN); break;
+  case 7: ROW7_PORT |= (1 << ROW7_PIN); break;
+  case 8: ROW8_PORT |= (1 << ROW8_PIN); break;
+  case 9: ROW9_PORT |= (1 << ROW9_PIN); break;
+  }
+}
+
+uint8_t fb_nextrow = 0;
+
+ISR(TIMER2_OVF_vect) {
+  franzis_pingpong_clear_row();
+
+  uint16_t data = ( framebuffer[fb_nextrow][0] ) | ( framebuffer[fb_nextrow][1] << 8);
+  franzis_pingpong_push(data);
+
+  franzis_pingpong_select_row(fb_nextrow);
+
+  fb_nextrow++;
+  fb_nextrow = fb_nextrow % 10;
+}

drivers/franzis_pp.h

@@ -0,0 +1,48 @@
+#define ROW0_DDR DDRB
+#define ROW0_PORT PORTB
+#define ROW0_PIN PB1
+
+#define ROW1_DDR DDRB
+#define ROW1_PORT PORTB
+#define ROW1_PIN PB0
+
+#define ROW2_DDR DDRD
+#define ROW2_PORT PORTD
+#define ROW2_PIN PD7
+
+#define ROW3_DDR DDRD
+#define ROW3_PORT PORTD
+#define ROW3_PIN PD6
+
+#define ROW4_DDR DDRD
+#define ROW4_PORT PORTD
+#define ROW4_PIN PD5
+
+#define ROW5_DDR DDRD
+#define ROW5_PORT PORTD
+#define ROW5_PIN PD4
+
+#define ROW6_DDR DDRC
+#define ROW6_PORT PORTC
+#define ROW6_PIN PC3
+
+#define ROW7_DDR DDRC
+#define ROW7_PORT PORTC
+#define ROW7_PIN PC2
+
+#define ROW8_DDR DDRC
+#define ROW8_PORT PORTC
+#define ROW8_PIN PC1
+
+#define ROW9_DDR DDRC
+#define ROW9_PORT PORTC
+#define ROW9_PIN PC0
+
+#define COLS_DDR DDRB
+#define COLS_PORT PORTB
+
+#define COLS_STR PB2
+#define COLS_DATA PB4
+#define COLS_CLK PB3
+
+void fb_hsync();

pingpong.c

@@ -0,0 +1,36 @@
+#include <util/delay.h>
+#include "drivers/framebuffer.h"
+
+int main(void) {
+  int8_t px, py, mx, my;
+
+  px = 0;
+  py = 0;
+  mx = 1;
+  my = 1;
+
+  while(1) {
+    if (px <= 0) {
+      mx = 1;
+    }
+
+    if (py <= 0) {
+      my = 1;
+    }
+
+    if (px >= FB_WIDTH - 1) {
+      mx = -1;
+    }
+
+    if (py >= FB_HEIGHT - 1) {
+      my = -1;
+    }
+
+    FB_SET(px,py,0);
+    px += mx;
+    py += my;
+    FB_SET(px,py,1);
+
+    _delay_ms(50);
+  }
+}