last-ditch debugging efforts

3 files changed, 6 insertions, 1 deletions

diff --git a/src/demo.c b/src/demo.c
index a5a3a1e..27b8db2 100644
--- a/src/demo.c
+++ b/src/demo.c
@@ -39,11 +39,14 @@ void hh_demo_setup() {
 		g_hh_demo_balls[i].palette_index = i+1;
 		g_hh_demo_balls[i].tilemap_index = 1;
 	}
-	hh_ppu_flush();
+	// hh_ppu_flush();
 }
 
 void hh_demo_loop(unsigned long frame) {
 	// if (frame % 300 == 0) hh_demo_setup();
+	//
+	// if (frame > 1) return;
+	// frame = 40;
 
 	// set background pattern position
 	hh_ppu_update_background_pos((frame / 5) % HH_PPU_SPRITE_WIDTH, (frame / 20) % HH_PPU_SPRITE_HEIGHT);
diff --git a/src/ppu/internals.c b/src/ppu/internals.c
index 7fd2eb9..5badfc9 100644
--- a/src/ppu/internals.c
+++ b/src/ppu/internals.c
@@ -105,6 +105,7 @@ void hh_ppu_vram_buffer(uint8_t data[4]) {
 }
 
 void hh_ppu_vram_flush() {
+	if (g_hh_ppu_vram_buffer_size == 0) return;
 	hh_ppu_vram_buffer((uint8_t[4]){ 0xff, 0xff, 0xff, 0xff });
 	hh_ppu_vram_dwrite(g_hh_ppu_vram_buffer_ptr, g_hh_ppu_vram_buffer_size);
 	g_hh_ppu_vram_buffer_size = 0;
diff --git a/src/ppu/stm.c b/src/ppu/stm.c
index ccf3566..7f60aed 100644
--- a/src/ppu/stm.c
+++ b/src/ppu/stm.c
@@ -8,6 +8,7 @@ void hh_ppu_init() {
 	hh_ppu_update_aux((hh_s_ppu_loc_aux) { .sysreset = 1 });
 	hh_ppu_vram_buffer((uint8_t[4]) { 0xff, 0xff, 0xff, 0xff });
 	hh_ppu_flush();
+	HAL_Delay(10);
 }
 
 void hh_ppu_deinit() {}