gistfile1.txt

----------- rules.mk -----------

POINTING_DEVICE_ENABLE = yes
POINTING_DEVICE_DRIVER = pimoroni_trackball

PS2_MOUSE_ENABLE = yes
PS2_ENABLE = yes
PS2_DRIVER = vendor

----------- config.h -----------

#define SERIAL_USART_TX_PIN GP1
#define MASTER_LEFT

#define SPLIT_POINTING_ENABLE
#define POINTING_DEVICE_RIGHT
#define POINTING_DEVICE_ROTATION_90

// The default streaming mode is flaky and doesn't always work. This setting doesn't seem to affect performance.
#define PS2_MOUSE_USE_REMOTE_MODE

// Serial uses PIO0, change PS2 to PIO1.
#define PS2_PIO_USE_PIO1

#define PS2_MOUSE_INVERT_X
#define PS2_MOUSE_INVERT_Y
#define PS2_DATA_PIN    GP2
#define PS2_CLOCK_PIN   GP3

// Start faster when keyboard resets.
#define PS2_MOUSE_INIT_DELAY 500