circuitpython/ports/mimxrt10xx/common-hal/microcontroller/Pin.c

139 lines
4.6 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
* Copyright (c) 2019 Artur Pacholec
* Copyright (c) 2020 Lucian Copeland 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 "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "py/gc.h"
STATIC bool claimed_pins[IOMUXC_SW_PAD_CTL_PAD_COUNT];
STATIC bool never_reset_pins[IOMUXC_SW_PAD_CTL_PAD_COUNT];
// Default is that no pins are forbidden to reset.
MP_WEAK const mcu_pin_obj_t *mimxrt10xx_reset_forbidden_pins[] = {
NULL,
};
STATIC bool _reset_forbidden(const mcu_pin_obj_t *pin) {
const mcu_pin_obj_t **forbidden_pin = &mimxrt10xx_reset_forbidden_pins[0];
while (*forbidden_pin) {
if (pin == *forbidden_pin) {
return true;
}
forbidden_pin++;
}
return false;
}
// There are two numbering systems used here:
// IOMUXC index, used for iterating through pins and accessing reset information,
// and GPIO port and number, used to store claimed and reset tagging. The two number
// systems are not related and one cannot determine the other without a pin object
void reset_all_pins(void) {
for (uint8_t i = 0; i < IOMUXC_SW_PAD_CTL_PAD_COUNT; i++) {
claimed_pins[i] = never_reset_pins[i];
}
for (uint8_t i = 0; i < IOMUXC_SW_PAD_CTL_PAD_COUNT; i++) {
mcu_pin_obj_t *pin = mcu_pin_globals.map.table[i].value;
if (never_reset_pins[pin->mux_idx]) {
continue;
}
common_hal_reset_pin(pin);
}
}
MP_WEAK bool mimxrt10xx_board_reset_pin_number(const mcu_pin_obj_t *pin) {
return false;
}
// Since i.MX pins need extra register and reset information to reset properly,
// resetting pins by number alone has been removed.
void common_hal_reset_pin(const mcu_pin_obj_t *pin) {
if (pin == NULL) {
return;
}
if (_reset_forbidden(pin)) {
return;
}
// Give the board a chance to reset the pin in a particular way, or not reset it at all.
if (mimxrt10xx_board_reset_pin_number(pin)) {
return;
}
disable_pin_change_interrupt(pin);
never_reset_pins[pin->mux_idx] = false;
claimed_pins[pin->mux_idx] = false;
*(uint32_t *)pin->mux_reg = pin->mux_reset;
*(uint32_t *)pin->cfg_reg = pin->pad_reset;
}
void common_hal_never_reset_pin(const mcu_pin_obj_t *pin) {
if (pin == NULL) {
return;
}
never_reset_pins[pin->mux_idx] = true;
}
bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
return !claimed_pins[pin->mux_idx];
}
uint8_t common_hal_mcu_pin_number(const mcu_pin_obj_t *pin) {
return pin->mux_idx; // returns IOMUXC to align with pin table
}
void common_hal_mcu_pin_claim(const mcu_pin_obj_t *pin) {
claimed_pins[pin->mux_idx] = true;
}
void claim_pin(const mcu_pin_obj_t *pin) {
common_hal_mcu_pin_claim(pin);
}
void common_hal_mcu_pin_reset_number(uint8_t pin_no) {
common_hal_reset_pin((mcu_pin_obj_t *)(mcu_pin_globals.map.table[pin_no].value));
}
const mcu_periph_obj_t *find_pin_function_sz(const mcu_periph_obj_t *list, size_t sz, const mcu_pin_obj_t *pin, int *instance, uint16_t name) {
if (!pin) {
return NULL;
}
for (size_t i = 0; i < sz; i++) {
if (*instance != -1 && *instance != list[i].bank_idx) {
continue;
}
if (pin == list[i].pin) {
*instance = list[i].bank_idx;
return &list[i];
}
}
mp_raise_ValueError_varg(translate("Invalid %q pin"), name);
}