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Swap PIO allocation of USB Host for better Pico W compatibility #8922

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Feb 15, 2024
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Swap PIO allocation of USB Host for better Pico W compatibility #8922

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8 changes: 4 additions & 4 deletions ports/raspberrypi/common-hal/usb_host/Port.c
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Original file line number Diff line number Diff line change
Expand Up @@ -122,10 +122,10 @@ usb_host_port_obj_t *common_hal_usb_host_port_construct(const mcu_pin_obj_t *dp,
pio_usb_configuration_t pio_cfg = PIO_USB_DEFAULT_CONFIG;
pio_cfg.skip_alarm_pool = true;
pio_cfg.pin_dp = dp->number;
pio_cfg.pio_tx_num = 0;
pio_cfg.pio_rx_num = 1;
// PIO with room for 22 instructions
// PIO with room for 31 instructions and two free SM.
// Allocating the peripherals like this works on Pico W, where the
// "preferred PIO" for the cyw43 wifi chip is PIO 1.
pio_cfg.pio_tx_num = 1; // uses 22 instructions and 1 SM
pio_cfg.pio_rx_num = 0; // uses 31 instructions and 2 SM.
if (!_has_program_room(pio_cfg.pio_tx_num, 22) || _sm_free_count(pio_cfg.pio_tx_num) < 1 ||
!_has_program_room(pio_cfg.pio_rx_num, 31) || _sm_free_count(pio_cfg.pio_rx_num) < 2) {
mp_raise_RuntimeError(MP_ERROR_TEXT("All state machines in use"));
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