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arghunterarghunter
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it works
1 parent a579ace commit f0d2b70

3 files changed

Lines changed: 268 additions & 2 deletions

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‎convert.py‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
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with open("./programs/hello.bin", "rb") as f:
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with open("./programs/mandelbrot.bin", "rb") as f:
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data = f.read()
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with open("./programs/hello.hex", "w") as f:
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with open("./programs/mandelbrot.hex", "w") as f:
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for i in range(0, len(data), 4):
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word = data[i:i+4]
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val = int.from_bytes(word, "little")

‎programs/mandelbrot.c‎

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__attribute__((naked)) void _start(void) {
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__asm__ volatile(
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"li sp, 0x4000\n"
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"call main\n"
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"loop: j loop\n"
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);
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}
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#define SCALE 1024
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#define MAX_ITER 32
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void draw_mandelbrot(volatile unsigned char* frame, int cx, int cy, int zoom) {
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int x_start = cx - zoom;
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int y_start = cy - (zoom * 240 / 320);
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int x_step = (zoom * 2) / 320;
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int y_step = (zoom * 2 * 240 / 320) / 240;
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if (x_step < 1) x_step = 1;
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if (y_step < 1) y_step = 1;
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for (int py = 0; py < 240; py++) {
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int ci = y_start + py * y_step;
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for (int px = 0; px < 320; px++) {
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int cr = x_start + px * x_step;
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int zr = 0;
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int zi = 0;
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int iter = 0;
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while (iter < MAX_ITER) {
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int zr2 = (zr * zr) >> 10;
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int zi2 = (zi * zi) >> 10;
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if (zr2 + zi2 > 4 * SCALE) break;
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int new_zr = zr2 - zi2 + cr;
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zi = ((2 * zr * zi) >> 10) + ci;
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zr = new_zr;
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iter++;
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}
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unsigned char color;
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if (iter == MAX_ITER) {
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color = 0x00;
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} else {
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color = (unsigned char)(iter * 7);
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}
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frame[0x4000 * (320 * py + px)] = color;
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}
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}
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}
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int main() {
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volatile unsigned char* frame = (volatile unsigned char*)0x0;
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int cx = -768;
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int cy = 0;
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int step = 0;
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while (1) {
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int zoom = 1536;
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for (int i = 0; i < step; i++) {
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zoom = (zoom * 3) / 4;
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}
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draw_mandelbrot(frame, cx, cy, zoom);
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step++;
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if (step > 8) step = 0;
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}
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}

‎programs/mandelbrot.hex‎

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