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// loads a port for CPU to read
void load16(uint8_t address, uint8_t data)
{
  // put the address and data onto STM32-CPLD bus
  uint16_t value = 0;
  value = (address & 0xf) << 8;
  value = value | data;
  CPLD_DATA_PORT->ODR &= 0xf000;
  CPLD_DATA_PORT->ODR |= value;
  data_output();

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// STM32 pin change interrupt handler
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  // IOWR interrupt
  if(GPIO_Pin == IOWR_Pin)
  {
    // switch to input
    data_input();
    addr_input();
    // enable address and data latch outputs

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void interrupt_activate(uint8_t vector)
{
  // put the interrupt vector on STM32-CPLD bus
  CPLD_DATA_PORT->ODR &= 0xff00;
  CPLD_DATA_PORT->ODR |= vector;
  // load the interrupt vector latch inside CPLD
  data_output();
  vect_load_activate();
  vect_load_deactivate();
  data_input();

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module decoder_4to16 (
	input  enable,
	input [3:0] binary_in,
	output reg [15:0] decoder_out
);

always @ (enable or binary_in)
begin
  if (enable) begin
    case (binary_in)

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module dlatch8(
	input wire [7:0] data, 
	input wire LE_H,
	input wire OE_L,
	output reg [7:0] q
	);

reg [7:0] q_internal;

// activates when LE_H or OE_L changes

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import serial	

NINTENDO_LOGO = [206, 237, 102, 102, 204, 13, 0, 11, 3, 115, 0, 131, 0, 12, 0, 13, 0, 8, 17, 31, 136, 137, 0, 14, 220, 204, 110, 230, 221, 221, 217, 153, 187, 187, 103, 99, 110, 14, 236, 204, 221, 220, 153, 159, 187, 185, 51, 62]
gcb_flag_dict = {0x80:"GB compatible GBC game", 0xc0:"GBC only game"}
cart_type_dict = {0x00:"ROM ONLY", 0x01:"MBC1", 0x02:"MBC1+RAM", 0x03:"MBC1+RAM+BATTERY", 0x05:"MBC2", 0x06:"MBC2+BATTERY", 0x08:"ROM+RAM", 0x09:"ROM+RAM+BATTERY", 0x0B:"MMM01", 0x0C:"MMM01+RAM", 0x0D:"MMM01+RAM+BATTERY", 0x0F:"MBC3+TIMER+BATTERY", 0x10:"MBC3+TIMER+RAM+BATTERY", 0x11:"MBC3", 0x12:"MBC3+RAM", 0x13:"MBC3+RAM+BATTERY", 0x15:"MBC4", 0x16:"MBC4+RAM", 0x17:"MBC4+RAM+BATTERY", 0x19:"MBC5", 0x1A:"MBC5+RAM", 0x1B:"MBC5+RAM+BATTERY", 0x1C:"MBC5+RUMBLE", 0x1D:"MBC5+RUMBLE+RAM", 0x1E:"MBC5+RUMBLE+RAM+BATTERY", 0xFC:"POCKET CAMERA", 0xFD:"BANDAI TAMA5", 0xFE:"HuC3", 0xFF:"HuC1+RAM+BATTERY"}
ROM_size_dict = {0x00:"32KByte (no ROM banking)", 0x01:"64KByte (4 banks)", 0x02:"128KByte (8 banks)", 0x0

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int main(void)
{
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
  /* Configure the system clock */
  SystemClock_Config();
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART1_UART_Init();
  MX_USART3_UART_Init();

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	include 	helper.z80
	
	org	0x0
	jmp	program_start

	org	0x10		; interrupt vector table
	.dw	0x3000		; keyboard interrupt at 0x3000

	org	0x100
program_start:

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vram_char_base_addr	.equ	0x8000
vram_attri_base_addr	.equ	0x8960

	org	0x0	
	xor	b
	xor	c	
	xor	d
	xor	e
	ld	sp, 0x7fff

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module cpu_vreg(
	input wire clk,
	input wire copy_in_progress,
	input wire close_to_vlank,
	input wire cpu_rd,
	input wire cpu_wr,
	input wire cpu_mreq,
	output reg [7:0] copy_enable,
	input wire [15:0] cpu_addr,