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Bootsel.cpp
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Bootsel.cpp
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/**
Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
SPDX-License-Identifier: BSD-3-Clause
*/
#include <Arduino.h>
#include <pico/stdlib.h>
#include <hardware/gpio.h>
#include <hardware/sync.h>
#include <hardware/structs/ioqspi.h>
#include <hardware/structs/sio.h>
// This example blinks the Pico LED when the BOOTSEL button is pressed.
//
// Picoboard has a button attached to the flash CS pin, which the bootrom
// checks, and jumps straight to the USB bootcode if the button is pressed
// (pulling flash CS low). We can check this pin in by jumping to some code in
// SRAM (so that the XIP interface is not required), floating the flash CS
// pin, and observing whether it is pulled low.
//
// This doesn't work if others are trying to access flash at the same time,
// e.g. XIP streamer, or the other core.
static bool __no_inline_not_in_flash_func(get_bootsel_button)() {
const uint CS_PIN_INDEX = 1;
// Must disable interrupts, as interrupt handlers may be in flash, and we
// are about to temporarily disable flash access!
noInterrupts();
rp2040.idleOtherCore();
// Set chip select to Hi-Z
hw_write_masked(&ioqspi_hw->io[CS_PIN_INDEX].ctrl,
GPIO_OVERRIDE_LOW << IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_LSB,
IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_BITS);
// Note we can't call into any sleep functions in flash right now
for (volatile int i = 0; i < 1000; ++i);
// The HI GPIO registers in SIO can observe and control the 6 QSPI pins.
// Note the button pulls the pin *low* when pressed.
bool button_state = !(sio_hw->gpio_hi_in & (1u << CS_PIN_INDEX));
// Need to restore the state of chip select, else we are going to have a
// bad time when we return to code in flash!
hw_write_masked(&ioqspi_hw->io[CS_PIN_INDEX].ctrl,
GPIO_OVERRIDE_NORMAL << IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_LSB,
IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_BITS);
rp2040.resumeOtherCore();
interrupts();
return button_state;
}
__Bootsel::operator bool() {
return get_bootsel_button();
}
__Bootsel BOOTSEL;