more debugging WIP

1 files changed, 19 insertions, 0 deletions

diff --git a/src/ppu/stm.c b/src/ppu/stm.c
index fd4a18c..371e557 100644
--- a/src/ppu/stm.c
+++ b/src/ppu/stm.c
@@ -1,4 +1,23 @@
+#include <stm32f0xx_hal.h>
+
 #include "ppu/ppu.h"
+#include "ppu/internals.h"
+#include "stm32/setup.h"
 
 void hh_ppu_init() {}
 void hh_ppu_deinit() {}
+
+void hh_ppu_vram_dwrite(hh_ppu_addr_t addr, hh_ppu_data_t data) {
+	// if (!hh_ppu_vram_valid_address(addr)) return;
+
+	uint8_t spi_data[4] = {
+		(addr & 0xff00) >> 8,
+		(addr & 0x00ff) >> 0,
+		(data & 0xff00) >> 8,
+		(data & 0x00ff) >> 0,
+	};
+
+	HAL_SPI_Transmit(&hspi1, spi_data, 4, HAL_MAX_DELAY);
+	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9, true);
+	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9, false);
+}