/* function to setup background 0 for this program */
void setup_background() {
/* load the palette from the image into palette memory*/
for (int i = 0; i < PALETTE_SIZE; i++) {
bg_palette[i] = background_palette[i];
}
/* load the image into char block 0 (16 bits at a time) */
volatile unsigned short* dest = char_block(0);
unsigned short* image = (unsigned short*) background_data;
for (int i = 0; i < ((background_width * background_height) / 2); i++) {
dest[i] = image[i];
}
/* set all control the bits in this register */
*bg0_control = 0 | /* priority, 0 is highest, 3 is lowest */
(0 << 2) | /* the char block the image data is stored in */
(0 << 6) | /* the mosaic flag */
(1 << 7) | /* color mode, 0 is 16 colors, 1 is 256 colors */
(16 << 8) | /* the screen block the tile data is stored in */
(1 << 13) | /* wrapping flag */
(0 << 14); /* bg size, 0 is 256x256 */
/* load the tile data into screen block 16 */
dest = screen_block(16);
for (int i = 0; i < (map_width * map_height); i++) {
dest[i] = map[i];
}
}
/* function to setup background 0 for this program */
void setup_background() {
/* load the palette from the image into palette memory*/
memcpy16_dma((unsigned short*) bg_palette, (unsigned short*) background_palette, PALETTE_SIZE);
/* load the image into char block 0 */
memcpy16_dma((unsigned short*) char_block(0), (unsigned short*) background_data,
(background_width * background_height) / 2);
/* set all control the bits in this register */
*bg0_control = 0 | /* priority, 0 is highest, 3 is lowest */
(0 << 2) | /* the char block the image data is stored in */
(0 << 6) | /* the mosaic flag */
(1 << 7) | /* color mode, 0 is 16 colors, 1 is 256 colors */
(16 << 8) | /* the screen block the tile data is stored in */
(1 << 13) | /* wrapping flag */
(0 << 14); /* bg size, 0 is 256x256 */
/* load the tile data into screen block 16 */
memcpy16_dma((unsigned short*) screen_block(16), (unsigned short*) map, map_width * map_height);
}
