GPIO Controller¶

The DRC SoC contains a GPIO controller that is used to control 8 external GPIO pins (of which 6 are used in the current firmware).

Registers¶

The following MMIO registers are used for GPIOs:

Address	Name	Connected to
F0005100	GPIO0	Unknown, used in the LCD driver.
F0005108	GPIO1	Unknown, unused in the LVC firmware.
F000510C	GPIO2	Unknown, used in the NFC driver.
F0005110	GPIO3	Unknown, called `TRM_ENABLE_POWER_GPIO` in the NFC driver.
F0005114	GPIO4	Controls the rumble motor.
F0005118	GPIO5	Controls the sensor bar power.
F000511C	GPIO6	Unknown, used in the CMOS driver.
F0005098	GPIO7	Unknown, unused in the LVC firmware.

To configure a GPIO, write a combination of the following flags to the GPIO register:

Direction

Unknown flags

For example, to configure the rumble motor GPIO as an output GPIO with pull-up resistors:

write32(MMIO_GPIO4, 0x8200);

To configure it as an input GPIO with pull-up resistors:

write32(MMIO_GPIO4, 0x8800);

To set an output GPIO to 0/1, use the 0x100 bit:

// 0
write32(MMIO_GPIO4, read32(MMIO_GPIO4) & ~0x100);
// 1
write32(MMIO_GPIO4, read32(MMIO_GPIO4) | 0x100);

To read an input GPIO, use the 0x400 bit:

int x = read32(MMIO_GPIO4) & 0x400;