rp2/modrp2: Support reading the BOOTSEL button on the Pico board.
And any other board that exposes this pin with a button.
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dc2186c35b
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@ -27,6 +27,11 @@
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#include "py/runtime.h"
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#include "drivers/dht/dht.h"
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#include "modrp2.h"
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#include "pico/stdlib.h"
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#include "hardware/gpio.h"
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#include "hardware/sync.h"
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#include "hardware/structs/ioqspi.h"
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#include "hardware/structs/sio.h"
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#if MICROPY_PY_NETWORK_CYW43
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#include "extmod/modnetwork.h"
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@ -36,11 +41,59 @@
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MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(mod_network_country_obj);
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#endif
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// Picoboard has a button attached to the flash CS pin, which the bootrom
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// checks, and jumps straight to the USB bootcode if the button is pressed
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// (pulling flash CS low). We can check this pin in by jumping to some code in
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// SRAM (so that the XIP interface is not required), floating the flash CS
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// pin, and observing whether it is pulled low.
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//
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// This doesn't work if others are trying to access flash at the same time,
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// e.g. XIP streamer, or the other core.
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// https://github.com/raspberrypi/pico-examples/blob/master/picoboard/button/button.c
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bool __no_inline_not_in_flash_func(get_bootsel_button)() {
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const uint CS_PIN_INDEX = 1;
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// Must disable interrupts, as interrupt handlers may be in flash, and we
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// are about to temporarily disable flash access!
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uint32_t flags = save_and_disable_interrupts();
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// Set chip select to Hi-Z
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hw_write_masked(&ioqspi_hw->io[CS_PIN_INDEX].ctrl,
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GPIO_OVERRIDE_LOW << IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_LSB,
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IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_BITS);
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// Note we can't call into any sleep functions in flash right now
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for (volatile int i = 0; i < 1000; ++i) {;
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}
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// The HI GPIO registers in SIO can observe and control the 6 QSPI pins.
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// Note the button pulls the pin *low* when pressed.
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bool button_state = !(sio_hw->gpio_hi_in & (1u << CS_PIN_INDEX));
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// Need to restore the state of chip select, else we are going to have a
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// bad time when we return to code in flash!
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hw_write_masked(&ioqspi_hw->io[CS_PIN_INDEX].ctrl,
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GPIO_OVERRIDE_NORMAL << IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_LSB,
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IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_BITS);
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restore_interrupts(flags);
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return button_state;
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}
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STATIC mp_obj_t rp2_bootsel_button(void) {
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return MP_OBJ_NEW_SMALL_INT(get_bootsel_button());
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}
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MP_DEFINE_CONST_FUN_OBJ_0(rp2_bootsel_button_obj, rp2_bootsel_button);
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STATIC const mp_rom_map_elem_t rp2_module_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_rp2) },
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{ MP_ROM_QSTR(MP_QSTR_Flash), MP_ROM_PTR(&rp2_flash_type) },
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{ MP_ROM_QSTR(MP_QSTR_PIO), MP_ROM_PTR(&rp2_pio_type) },
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{ MP_ROM_QSTR(MP_QSTR_StateMachine), MP_ROM_PTR(&rp2_state_machine_type) },
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{ MP_ROM_QSTR(MP_QSTR_bootsel_button), MP_ROM_PTR(&rp2_bootsel_button_obj) },
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#if MICROPY_PY_NETWORK_CYW43
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// Deprecated (use network.country instead).
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