circuitpython/ports/rp2/modrp2.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020-2021 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/runtime.h"
#include "drivers/dht/dht.h"
#include "modrp2.h"
#include "pico/stdlib.h"
#include "hardware/gpio.h"
#include "hardware/sync.h"
#include "hardware/structs/ioqspi.h"
#include "hardware/structs/sio.h"
#if MICROPY_PY_NETWORK_CYW43
#include "extmod/modnetwork.h"
#endif
#if MICROPY_PY_NETWORK_CYW43
MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(mod_network_country_obj);
#endif
// Improved version of
// https://github.com/raspberrypi/pico-examples/blob/master/picoboard/button/button.c
STATIC bool __no_inline_not_in_flash_func(bootsel_button)(void) {
const uint CS_PIN_INDEX = 1;
// Disable interrupts and the other core since they might be
// executing code from flash and we are about to temporarily
// disable flash access.
mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
// Set the CS pin to high impedance.
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);
// Delay without calling any functions in flash.
uint32_t start = timer_hw->timerawl;
while ((uint32_t)(timer_hw->timerawl - start) <= MICROPY_HW_BOOTSEL_DELAY_US) {
;
}
// The HI GPIO registers in SIO can observe and control the 6 QSPI pins.
// The button pulls the QSPI_SS pin *low* when pressed.
bool button_state = !(sio_hw->gpio_hi_in & (1 << CS_PIN_INDEX));
// Restore the QSPI_SS pin so we can use flash again.
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);
MICROPY_END_ATOMIC_SECTION(atomic_state);
return button_state;
}
STATIC mp_obj_t rp2_bootsel_button(void) {
return MP_OBJ_NEW_SMALL_INT(bootsel_button());
}
MP_DEFINE_CONST_FUN_OBJ_0(rp2_bootsel_button_obj, rp2_bootsel_button);
STATIC const mp_rom_map_elem_t rp2_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_rp2) },
{ MP_ROM_QSTR(MP_QSTR_Flash), MP_ROM_PTR(&rp2_flash_type) },
{ MP_ROM_QSTR(MP_QSTR_PIO), MP_ROM_PTR(&rp2_pio_type) },
{ MP_ROM_QSTR(MP_QSTR_StateMachine), MP_ROM_PTR(&rp2_state_machine_type) },
{ MP_ROM_QSTR(MP_QSTR_bootsel_button), MP_ROM_PTR(&rp2_bootsel_button_obj) },
#if MICROPY_PY_NETWORK_CYW43
// Deprecated (use network.country instead).
{ MP_ROM_QSTR(MP_QSTR_country), MP_ROM_PTR(&mod_network_country_obj) },
#endif
};
STATIC MP_DEFINE_CONST_DICT(rp2_module_globals, rp2_module_globals_table);
const mp_obj_module_t mp_module_rp2 = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t *)&rp2_module_globals,
};
MP_REGISTER_MODULE(MP_QSTR__rp2, mp_module_rp2);