raspberrypi: Claim UART after checking pins
If, for some reason, you mix up TX and RX when calling `busio.UART` (who would do that ;) ), you get `Invalid pins`. When you go to try again, you'll get `All UART peripherals are in use` because the interface was claimed as busy before pins are verified. This should fix that issue.
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@ -118,17 +118,17 @@ void common_hal_busio_uart_construct(busio_uart_obj_t *self,
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uint8_t uart_id = ((((tx != NULL) ? tx->number : rx->number) + 4) / 8) % NUM_UARTS;
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self->tx_pin = pin_init(uart_id, tx, 0);
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self->rx_pin = pin_init(uart_id, rx, 1);
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self->cts_pin = pin_init(uart_id, cts, 2);
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self->rts_pin = pin_init(uart_id, rts, 3);
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if (uart_status[uart_id] != STATUS_FREE) {
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mp_raise_RuntimeError(translate("All UART peripherals are in use"));
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} else {
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uart_status[uart_id] = STATUS_BUSY;
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}
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self->tx_pin = pin_init(uart_id, tx, 0);
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self->rx_pin = pin_init(uart_id, rx, 1);
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self->cts_pin = pin_init(uart_id, cts, 2);
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self->rts_pin = pin_init(uart_id, rts, 3);
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self->uart = UART_INST(uart_id);
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self->uart_id = uart_id;
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self->baudrate = baudrate;
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