circuitpython/ports/raspberrypi/common-hal/microcontroller/Pin.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Scott Shawcroft for Adafruit Industries
*
* 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 "common-hal/microcontroller/__init__.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "src/rp2_common/hardware_gpio/include/hardware/gpio.h"
#if CIRCUITPY_CYW43
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#include "bindings/cyw43/__init__.h"
#include "pico/cyw43_arch.h"
bool cyw_ever_init;
static uint32_t cyw_pin_claimed;
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void reset_pin_number_cyw(uint8_t pin_no) {
cyw_pin_claimed &= ~(1 << pin_no);
}
#endif
STATIC uint32_t never_reset_pins;
void reset_all_pins(void) {
for (size_t i = 0; i < NUM_BANK0_GPIOS; i++) {
if ((never_reset_pins & (1 << i)) != 0) {
continue;
}
reset_pin_number(i);
}
#if CIRCUITPY_CYW43
if (cyw_ever_init) {
// reset LED and SMPS_MODE to Low; don't touch VBUS_SENSE
// otherwise it is switched to output mode forever!
cyw43_arch_gpio_put(0, 0);
cyw43_arch_gpio_put(1, 0);
}
cyw_pin_claimed = 0;
#endif
}
void never_reset_pin_number(uint8_t pin_number) {
if (pin_number >= NUM_BANK0_GPIOS) {
return;
}
never_reset_pins |= 1 << pin_number;
}
void reset_pin_number(uint8_t pin_number) {
if (pin_number >= NUM_BANK0_GPIOS) {
return;
}
never_reset_pins &= ~(1 << pin_number);
// We are very aggressive in shutting down the pad fully. Both pulls are
// disabled and both buffers are as well.
gpio_init(pin_number);
hw_clear_bits(&padsbank0_hw->io[pin_number], PADS_BANK0_GPIO0_IE_BITS |
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PADS_BANK0_GPIO0_PUE_BITS |
PADS_BANK0_GPIO0_PDE_BITS);
hw_set_bits(&padsbank0_hw->io[pin_number], PADS_BANK0_GPIO0_OD_BITS);
}
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void common_hal_never_reset_pin(const mcu_pin_obj_t *pin) {
never_reset_pin_number(pin->number);
}
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void common_hal_reset_pin(const mcu_pin_obj_t *pin) {
#if CIRCUITPY_CYW43
if (pin->base.type == &cyw43_pin_type) {
reset_pin_number_cyw(pin->number);
return;
}
#endif
reset_pin_number(pin->number);
}
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void claim_pin(const mcu_pin_obj_t *pin) {
#if CIRCUITPY_CYW43
if (pin->base.type == &cyw43_pin_type) {
cyw_pin_claimed |= (1 << pin->number);
}
#endif
// Nothing to do because all changes will set the GPIO settings.
}
bool pin_number_is_free(uint8_t pin_number) {
if (pin_number >= NUM_BANK0_GPIOS) {
return false;
}
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uint32_t pad_state = padsbank0_hw->io[pin_number];
return (pad_state & PADS_BANK0_GPIO0_IE_BITS) == 0 &&
(pad_state & PADS_BANK0_GPIO0_OD_BITS) != 0;
}
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bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
#if CIRCUITPY_CYW43
if (pin->base.type == &cyw43_pin_type) {
return !(cyw_pin_claimed & (1 << pin->number));
}
#endif
return pin_number_is_free(pin->number);
}
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uint8_t common_hal_mcu_pin_number(const mcu_pin_obj_t *pin) {
return pin->number;
}
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void common_hal_mcu_pin_claim(const mcu_pin_obj_t *pin) {
return claim_pin(pin);
}
void common_hal_mcu_pin_reset_number(uint8_t pin_no) {
reset_pin_number(pin_no);
}