// copy frame buffer to graphic buffer on display
void RrdGlcd::fillGDRAM(const uint8_t *bitmap) {
unsigned char i, y;
for ( i = 0 ; i < 2 ; i++ ) {
ST7920_CS();
for ( y = 0 ; y < PAGE_HEIGHT ; y++ ) {
ST7920_SET_CMD();
ST7920_WRITE_BYTE(0x80 | y);
if ( i == 0 ) {
ST7920_WRITE_BYTE(0x80);
} else {
ST7920_WRITE_BYTE(0x80 | 0x08);
}
ST7920_SET_DAT();
ST7920_WRITE_BYTES(bitmap, WIDTH/8); // bitmap gets incremented in this macro
}
ST7920_NCS();
}
}
uint8_t u8g_dev_rrd_st7920_128x64_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg) {
uint8_t i, y;
switch (msg) {
case U8G_DEV_MSG_INIT: {
OUT_WRITE(ST7920_CS_PIN, LOW);
OUT_WRITE(ST7920_DAT_PIN, LOW);
OUT_WRITE(ST7920_CLK_PIN, HIGH);
ST7920_CS();
u8g_Delay(120); //initial delay for boot up
ST7920_SET_CMD();
ST7920_WRITE_BYTE(0x20); //non-extended mode
ST7920_WRITE_BYTE(0x08); //display off, cursor+blink off
ST7920_WRITE_BYTE(0x01); //clear DDRAM ram
u8g_Delay(15); //delay for DDRAM clear
ST7920_WRITE_BYTE(0x24); //extended mode
ST7920_WRITE_BYTE(0x26); //extended mode + GDRAM active
for (y = 0; y < (LCD_PIXEL_HEIGHT) / 2; y++) { //clear GDRAM
ST7920_WRITE_BYTE(0x80 | y); //set y
ST7920_WRITE_BYTE(0x80); //set x = 0
ST7920_SET_DAT();
for (i = 0; i < 2 * (LCD_PIXEL_WIDTH) / 8; i++) //2x width clears both segments
ST7920_WRITE_BYTE(0);
ST7920_SET_CMD();
}
ST7920_WRITE_BYTE(0x0C); //display on, cursor+blink off
ST7920_NCS();
}
break;
case U8G_DEV_MSG_STOP: break;
case U8G_DEV_MSG_PAGE_NEXT: {
uint8_t* ptr;
u8g_pb_t* pb = (u8g_pb_t*)(dev->dev_mem);
y = pb->p.page_y0;
ptr = (uint8_t*)pb->buf;
ST7920_CS();
for (i = 0; i < PAGE_HEIGHT; i ++) {
ST7920_SET_CMD();
if (y < 32) {
ST7920_WRITE_BYTE(0x80 | y); //y
ST7920_WRITE_BYTE(0x80); //x=0
}
else {
ST7920_WRITE_BYTE(0x80 | (y - 32)); //y
ST7920_WRITE_BYTE(0x80 | 8); //x=64
}
ST7920_SET_DAT();
ST7920_WRITE_BYTES(ptr, (LCD_PIXEL_WIDTH) / 8); //ptr is incremented inside of macro
y++;
}
ST7920_NCS();
}
break;
}
#if PAGE_HEIGHT == 8
return u8g_dev_pb8h1_base_fn(u8g, dev, msg, arg);
#elif PAGE_HEIGHT == 16
return u8g_dev_pb16h1_base_fn(u8g, dev, msg, arg);
#else
return u8g_dev_pb32h1_base_fn(u8g, dev, msg, arg);
#endif
}
