Disassembly of the iriver H300 original firmware

General

I took the time to start a serious disassembly of the H300 1.30eu iriver firmware to see if I could find out some things about the power management, and the handling of the remote controls.

Progress

Findings so far

Nothing spectacular, but here are a few things that they do and we should:

PCF50606

Some general purpose outputs are set like this when enabling the backlight:

Also, when they turn off the device, they set GPOOD2 and GPOOD3 like this:

For some reason, the application retains the OPMOD settings for the regulators:

IOREGC = (IOREGC & 0xe0) | 0x14;
D1REGC = (D1REGC & 0xe0) | 0x1f;
D2REGC = ((D2REGC & 0xe0) | 0x18) & 0x1f; /* What a silly thing to do... */
D3REGC = (D3REGC & 0xe0) | 0x10;
LPREGC = (LPREGC & 0xe0) | 0x0f;

void lcd_enable(bool on_off)
{
   if(on_off)
   {
      lcd_write_reg(R_DISP_CONTROL1, 0x0061);
      sleep(1);
      lcd_write_reg(R_DISP_CONTROL1, 0x0067);
      sleep(1);
      lcd_write_reg(R_DISP_CONTROL1, 0x0637);
      backlight_on();
   }
   else
   {
      backlight_off();
      lcd_write_reg(R_DISP_CONTROL1, 0x0636);
      sleep(1);
      lcd_write_reg(R_DISP_CONTROL1, 0x0626);
   }
}