Registers #
GPIO #
| Old3DS | Name | Address | Width |
|---|---|---|---|
| Yes | GPIO1_DATA | 0x10147000 | 1 |
| Yes | GPIO2_DATA | 0x10147010 | 1 |
| Yes | GPIO2_DIR | 0x10147011 | 1 |
| Yes | GPIO2_INTCFG | 0x10147012 | 1 |
| Yes | GPIO2_INTEN | 0x10147013 | 1 |
| Yes | GPIO2_DATA2 | 0x10147014 | 2 |
| Yes | GPIO3_DATA | 0x10147020 | 2 |
| Yes | GPIO3_DIR | 0x10147022 | 2 |
| Yes | GPIO3_INTCFG | 0x10147024 | 2 |
| Yes | GPIO3_INTEN | 0x10147026 | 2 |
| Yes | GPIO3_DATA2 | 0x10147028 | 2 |
Legacy RTC #
| Name | Address | Width | Description |
|---|---|---|---|
| RTC_CNT | 0x10147100 | 2 | Control register |
| RTC_REG_STAT1 | 0x10147110 | 1 | Rtc status register 1 (command 0). Bitswapped |
| RTC_REG_STAT2 | 0x10147111 | 1 | Rtc status register 2 (command 1). Bitswapped |
| RTC_REG_CLKADJ | 0x10147112 | 1 | Rtc clock adjustment register (command 6). Bitswapped |
| RTC_REG_FREE | 0x10147113 | 1 | The free general purpose rtc register (command 7). Bitswapped |
| RTC_REG_TIME1 | 0x10147120 | 4 | Byte-wise bit-swapped (bit7 is bit0, etc.) BCD RTC (byte0 = seconds, byte1 = minutes, byte2 = hours, byte3 = day of week) |
| RTC_REG_TIME2 | 0x10147124 | 4 (3?) | Day, month and year all byte-wise bit-swapped |
| RTC_REG_ALRMTIM1 | 0x10147130 | 4 (3?) | Rtc alarm time register 1 (command 4). Byte-wise bit-swapped |
| RTC_REG_ALRMTIM2 | 0x10147134 | 4 (3?) | Rtc alarm time register 2 (command 5). Byte-wise bit-swapped |
| RTC_REG_COUNT | 0x10147140 | 4 (3?) | Rtc dsi counter register (ex command 0). Byte-wise bit-swapped |
| RTC_REG_FOUT1 | 0x10147150 | 1 | Rtc dsi fout register 1 (ex command 1). Bitswapped |
| RTC_REG_FOUT2 | 0x10147151 | 1 | Rtc dsi fout register 2 (ex command 2). Bitswapped |
| RTC_REG_ALRMDAT1 | 0x10147160 | 4 (3?) | Rtc dsi alarm date register 1 (ex command 4). Byte-wise bit-swapped |
| RTC_REG_ALRMDAT2 | 0x10147164 | 4 (3?) | Rtc dsi alarm date register 2 (ex command 5). Byte-wise bit-swapped |
Descriptions #
GPIO #
GPIO pins #
Only GPIO2 and GPIO3 pins have their interrupts configurable. Active low pins should be configured as “falling edge”, and output ports shouldn’t have interrupts enabled at all.
GPIO Services bitmasks use this table, in that order:
| Bit | IRQ ID | Description |
|---|---|---|
| 0 | ? | Debug button (?) (active-low) |
| 1 | 0x63 (falling edge) | Touch Screen (active low, 0 = screen pressed) |
| 2 | 0x60 (falling edge) 0x62 (rising edge) | Shell closed |
| 0 | 0x64 | Headphones inserted |
| 1 | 0x66 | TWL depop circuit (?) (active-low) |
| DATA2.0 | - | WiFi mode/freq. select (0 = CTR, 1 = MP (DS WiFi)) |
| 0 | 0x68 | C-stick interrupt |
| 1 | 0x69 | IrDA interrupt (active-low) |
| 2 | 0x6A | Gyro interrupt |
| 3 | 0x6B | C-stick “stop” (output) |
| 4 | 0x6C | IrDA TX-RC (output) |
| 5 | 0x6D | IrDA RXD (active-low) |
| 6 | 0x6E | NFC output1 (?) |
| 7 | 0x6F | NFC output2 (?) |
| 8 | 0x70 | Headphones button/half-inserted (active-low) |
| 9 | 0x71 | MCU interrupt |
| 10 | 0x72 | NFC interrupt (?) |
| 11 | 0x73 | QTM output (?) |
| DATA2.0 | - | WiFi enable |
GPIOn_DATA #
Pin values, one bit per pin.
GPIOn_DIR #
Pin directions for GPIO2 and GPIO3, one bit per pin.
| Value | Description |
|---|---|
| 0 | Input |
| 1 | Output |
GPIOn_INTCFG #
Interrupt configuration for GPIO2 and GPIO3 pins (not the extra ones), one bit per pin.
| Value | Description |
|---|---|
| 0 | Falling edge |
| 1 | Rising edge |
GPIOn_INTEN #
Interrupt enable bits for GPIO2 and GPIO3 pins (not the extra ones), one bit per pin.
| Value | Description |
|---|---|
| 0 | Interrupt disabled |
| 1 | Interrupt enabled |
GPIOn_DATA2 #
Extra pins for GPIO2 and GPIO3 (one bit each). These two pins, in total, are not bound to any IRQ and are not configurable.
Default values #
After bootrom initialization, these are the values of the registers:
| Address | Value |
|---|---|
| 0x10147000 | 0x0003 |
| 0x10147010 | 0x00000002 |
| 0x10147014 | 0x0000 |
| 0x10147020 | 0x00000DFB |
| 0x10147024 | 0x00000000 |
| 0x10147028 | 0x0000 |
Legacy RTC #
RTC_CNT (0x10147100) #
| Bit | Description |
|---|---|
| 0 | Latch STAT1 |
| 1 | Latch STAT2 |
| 2 | Latch CLKADJ |
| 3 | Latch FREE |
| 4 | Latch TIME |
| 5 | Latch ALRMTIM1 |
| 6 | Latch ALRMTIM2 |
| 7 | Latch COUNT |
| 8 | Latch FOUT1 |
| 9 | Latch FOUT2 |
| 10 | Latch ALRMDAT1 |
| 11 | Latch ALRMDAT2 |
| 12 | ARM7 Busy? This may be chipselect |
| 13 | ARM7 write command received? (writing 1 clears it seems) |
| 14 | ARM7 read command recieved? (writing 1 clears it seems) |
| 15 | DS SIO SI pin (rtc irq pin) |