inline void register_write(uint8_t reg, uint8_t value)
/* Write to register
Writes a value to an APU register by feeding the 6502
with instructions for loading the value into A, and then
storing the value in $40<reg>.
*/
{
// Put STA_zp on bus before deactivating CPU latch
bus_write(STA_zp);
// Open latch output
bus_select(CPU_ADDRESS);
// The code in the register set function has to be cycle exact, so it has to
// be run with interrupts disabled:
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
register_set(reg, value);
}
// Finally, latch the last bus value by deselecting the CPU
bus_deselect();
// Reflect change in mirror
reg_mirror[reg] = value;
}
void op_init(t_context *C)
{
set_draw_plug=0;
// create menus
op_menu_init(C);
// register
register_set(C);
set_draw_plug=1;
}
