a2d5d84ecc
Most pin I/O can be done just knowing the pin number as a simple integer, and it's more efficient this way (code size, speed) because it doesn't require a memory lookup to get the pin id from the pin object. If the full pin object is needed then it can be easily looked up in the pin table.
424 lines
14 KiB
C
424 lines
14 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014, 2015 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include "etshal.h"
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#include "c_types.h"
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#include "user_interface.h"
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#include "gpio.h"
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "py/gc.h"
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#include "modpyb.h"
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#include "utils.h"
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#define GET_TRIGGER(phys_port) \
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GPIO_PIN_INT_TYPE_GET(GPIO_REG_READ(GPIO_PIN_ADDR(phys_port)))
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#define SET_TRIGGER(phys_port, trig) \
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(GPIO_REG_WRITE(GPIO_PIN_ADDR(phys_port), \
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(GPIO_REG_READ(GPIO_PIN_ADDR(phys_port)) & ~GPIO_PIN_INT_TYPE_MASK) \
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| GPIO_PIN_INT_TYPE_SET(trig))) \
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#define GPIO_MODE_INPUT (0)
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#define GPIO_MODE_OUTPUT (1)
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#define GPIO_MODE_OPEN_DRAIN (2) // synthesised
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#define GPIO_PULL_NONE (0)
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#define GPIO_PULL_UP (1)
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// Removed in SDK 1.1.0
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//#define GPIO_PULL_DOWN (2)
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typedef struct _pin_irq_obj_t {
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mp_obj_base_t base;
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uint16_t phys_port;
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} pin_irq_obj_t;
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const pyb_pin_obj_t pyb_pin_obj[16 + 1] = {
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{{&pyb_pin_type}, 0, FUNC_GPIO0, PERIPHS_IO_MUX_GPIO0_U},
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{{&pyb_pin_type}, 1, FUNC_GPIO1, PERIPHS_IO_MUX_U0TXD_U},
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{{&pyb_pin_type}, 2, FUNC_GPIO2, PERIPHS_IO_MUX_GPIO2_U},
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{{&pyb_pin_type}, 3, FUNC_GPIO3, PERIPHS_IO_MUX_U0RXD_U},
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{{&pyb_pin_type}, 4, FUNC_GPIO4, PERIPHS_IO_MUX_GPIO4_U},
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{{&pyb_pin_type}, 5, FUNC_GPIO5, PERIPHS_IO_MUX_GPIO5_U},
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{{NULL}, 0, 0, 0},
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{{NULL}, 0, 0, 0},
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{{NULL}, 0, 0, 0},
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{{&pyb_pin_type}, 9, FUNC_GPIO9, PERIPHS_IO_MUX_SD_DATA2_U},
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{{&pyb_pin_type}, 10, FUNC_GPIO10, PERIPHS_IO_MUX_SD_DATA3_U},
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{{NULL}, 0, 0, 0},
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{{&pyb_pin_type}, 12, FUNC_GPIO12, PERIPHS_IO_MUX_MTDI_U},
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{{&pyb_pin_type}, 13, FUNC_GPIO13, PERIPHS_IO_MUX_MTCK_U},
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{{&pyb_pin_type}, 14, FUNC_GPIO14, PERIPHS_IO_MUX_MTMS_U},
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{{&pyb_pin_type}, 15, FUNC_GPIO15, PERIPHS_IO_MUX_MTDO_U},
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// GPIO16 is special, belongs to different register set, and
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// otherwise handled specially.
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{{&pyb_pin_type}, 16, -1, -1},
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};
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STATIC uint8_t pin_mode[16 + 1];
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// forward declaration
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STATIC const pin_irq_obj_t pin_irq_obj[16];
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void pin_init0(void) {
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ETS_GPIO_INTR_DISABLE();
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ETS_GPIO_INTR_ATTACH(pin_intr_handler_iram, NULL);
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// disable all interrupts
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memset(&MP_STATE_PORT(pin_irq_handler)[0], 0, 16 * sizeof(mp_obj_t));
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for (int p = 0; p < 16; ++p) {
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GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, 1 << p);
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SET_TRIGGER(p, 0);
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}
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ETS_GPIO_INTR_ENABLE();
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}
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void pin_intr_handler(uint32_t status) {
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gc_lock();
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status &= 0xffff;
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for (int p = 0; status; ++p, status >>= 1) {
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if (status & 1) {
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mp_obj_t handler = MP_STATE_PORT(pin_irq_handler)[p];
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if (handler != MP_OBJ_NULL) {
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call_function_1_protected(handler, MP_OBJ_FROM_PTR(&pyb_pin_obj[p]));
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}
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}
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}
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gc_unlock();
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}
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pyb_pin_obj_t *mp_obj_get_pin_obj(mp_obj_t pin_in) {
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if (mp_obj_get_type(pin_in) != &pyb_pin_type) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "expecting a pin"));
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}
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pyb_pin_obj_t *self = pin_in;
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return self;
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}
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uint mp_obj_get_pin(mp_obj_t pin_in) {
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return mp_obj_get_pin_obj(pin_in)->phys_port;
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}
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int pin_get(uint pin) {
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if (pin == 16) {
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return READ_PERI_REG(RTC_GPIO_IN_DATA) & 1;
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}
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return GPIO_INPUT_GET(pin);
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}
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void pin_set(uint pin, int value) {
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if (pin == 16) {
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int out_en = (pin_mode[pin] == GPIO_MODE_OUTPUT);
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WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
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WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
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WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1) | out_en);
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WRITE_PERI_REG(RTC_GPIO_OUT, (READ_PERI_REG(RTC_GPIO_OUT) & ~1) | value);
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return;
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}
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uint32_t enable = 0;
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uint32_t disable = 0;
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switch (pin_mode[pin]) {
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case GPIO_MODE_INPUT:
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value = -1;
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disable = 1;
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break;
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case GPIO_MODE_OUTPUT:
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enable = 1;
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break;
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case GPIO_MODE_OPEN_DRAIN:
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if (value == -1) {
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return;
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} else if (value == 0) {
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enable = 1;
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} else {
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value = -1;
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disable = 1;
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}
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break;
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}
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enable <<= pin;
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disable <<= pin;
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if (value == -1) {
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gpio_output_set(0, 0, enable, disable);
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} else {
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gpio_output_set(value << pin, (1 - value) << pin, enable, disable);
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}
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}
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STATIC void pyb_pin_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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pyb_pin_obj_t *self = self_in;
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// pin name
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mp_printf(print, "Pin(%u)", self->phys_port);
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}
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// pin.init(mode, pull=Pin.PULL_NONE, af=-1)
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STATIC mp_obj_t pyb_pin_obj_init_helper(pyb_pin_obj_t *self, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT },
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{ MP_QSTR_pull, MP_ARG_INT, {.u_int = GPIO_PULL_NONE}},
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{ MP_QSTR_value, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL}},
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};
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// parse args
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struct {
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mp_arg_val_t mode, pull, value;
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} args;
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mp_arg_parse_all(n_args, pos_args, kw_args,
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MP_ARRAY_SIZE(allowed_args), allowed_args, (mp_arg_val_t*)&args);
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// get io mode
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uint mode = args.mode.u_int;
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// get pull mode
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uint pull = args.pull.u_int;
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// get initial value
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int value;
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if (args.value.u_obj == MP_OBJ_NULL) {
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value = -1;
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} else {
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value = mp_obj_is_true(args.value.u_obj);
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}
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// save the mode
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pin_mode[self->phys_port] = mode;
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// configure the GPIO as requested
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if (self->phys_port == 16) {
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// TODO: Set pull up/pull down
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} else {
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PIN_FUNC_SELECT(self->periph, self->func);
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#if 0
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// Removed in SDK 1.1.0
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if ((pull & GPIO_PULL_DOWN) == 0) {
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PIN_PULLDWN_DIS(self->periph);
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}
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#endif
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if ((pull & GPIO_PULL_UP) == 0) {
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PIN_PULLUP_DIS(self->periph);
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}
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#if 0
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if ((pull & GPIO_PULL_DOWN) != 0) {
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PIN_PULLDWN_EN(self->periph);
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}
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#endif
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if ((pull & GPIO_PULL_UP) != 0) {
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PIN_PULLUP_EN(self->periph);
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}
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}
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pin_set(self->phys_port, value);
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return mp_const_none;
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}
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// constructor(id, ...)
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STATIC mp_obj_t pyb_pin_make_new(const mp_obj_type_t *type, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
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// get the wanted pin object
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int wanted_pin = mp_obj_get_int(args[0]);
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pyb_pin_obj_t *pin = NULL;
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if (0 <= wanted_pin && wanted_pin < MP_ARRAY_SIZE(pyb_pin_obj)) {
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pin = (pyb_pin_obj_t*)&pyb_pin_obj[wanted_pin];
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}
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if (pin == NULL || pin->base.type == NULL) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "invalid pin"));
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}
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if (n_args > 1 || n_kw > 0) {
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// pin mode given, so configure this GPIO
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mp_map_t kw_args;
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mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
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pyb_pin_obj_init_helper(pin, n_args - 1, args + 1, &kw_args);
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}
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return (mp_obj_t)pin;
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}
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// fast method for getting/setting pin value
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STATIC mp_obj_t pyb_pin_call(mp_obj_t self_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 0, 1, false);
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pyb_pin_obj_t *self = self_in;
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if (n_args == 0) {
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// get pin
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return MP_OBJ_NEW_SMALL_INT(GPIO_INPUT_GET(self->phys_port));
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} else {
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// set pin
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pin_set(self->phys_port, mp_obj_is_true(args[0]));
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return mp_const_none;
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}
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}
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// pin.init(mode, pull)
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STATIC mp_obj_t pyb_pin_obj_init(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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return pyb_pin_obj_init_helper(args[0], n_args - 1, args + 1, kw_args);
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(pyb_pin_init_obj, 1, pyb_pin_obj_init);
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// pin.value([value])
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STATIC mp_obj_t pyb_pin_value(mp_uint_t n_args, const mp_obj_t *args) {
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return pyb_pin_call(args[0], n_args - 1, 0, args + 1);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_pin_value_obj, 1, 2, pyb_pin_value);
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// pin.low()
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STATIC mp_obj_t pyb_pin_low(mp_obj_t self_in) {
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pyb_pin_obj_t *self = self_in;
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pin_set(self->phys_port, 0);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_pin_low_obj, pyb_pin_low);
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// pin.high()
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STATIC mp_obj_t pyb_pin_high(mp_obj_t self_in) {
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pyb_pin_obj_t *self = self_in;
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pin_set(self->phys_port, 1);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_pin_high_obj, pyb_pin_high);
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// pin.irq()
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STATIC mp_obj_t pyb_pin_irq(size_t n_args, const mp_obj_t *args) {
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pyb_pin_obj_t *self = MP_OBJ_TO_PTR(args[0]);
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if (self->phys_port >= 16) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "pin does not have IRQ capabilities"));
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}
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if (n_args > 1) {
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// configure irq
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int trig = mp_obj_get_int(args[1]);
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mp_obj_t handler = args[2];
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if (handler == mp_const_none) {
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handler = MP_OBJ_NULL;
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}
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ETS_GPIO_INTR_DISABLE();
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MP_STATE_PORT(pin_irq_handler)[self->phys_port] = handler;
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SET_TRIGGER(self->phys_port, trig);
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GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, 1 << self->phys_port);
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ETS_GPIO_INTR_ENABLE();
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}
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// return the irq object
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return MP_OBJ_FROM_PTR(&pin_irq_obj[self->phys_port]);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_pin_irq_obj, 1, 3, pyb_pin_irq);
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STATIC const mp_map_elem_t pyb_pin_locals_dict_table[] = {
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// instance methods
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{ MP_OBJ_NEW_QSTR(MP_QSTR_init), (mp_obj_t)&pyb_pin_init_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_value), (mp_obj_t)&pyb_pin_value_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_low), (mp_obj_t)&pyb_pin_low_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_high), (mp_obj_t)&pyb_pin_high_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_irq), (mp_obj_t)&pyb_pin_irq_obj },
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// class constants
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{ MP_OBJ_NEW_QSTR(MP_QSTR_IN), MP_OBJ_NEW_SMALL_INT(GPIO_MODE_INPUT) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_OUT), MP_OBJ_NEW_SMALL_INT(GPIO_MODE_OUTPUT) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_OPEN_DRAIN), MP_OBJ_NEW_SMALL_INT(GPIO_MODE_OPEN_DRAIN) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_PULL_NONE), MP_OBJ_NEW_SMALL_INT(GPIO_PULL_NONE) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_PULL_UP), MP_OBJ_NEW_SMALL_INT(GPIO_PULL_UP) },
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//{ MP_OBJ_NEW_QSTR(MP_QSTR_PULL_DOWN), MP_OBJ_NEW_SMALL_INT(GPIO_PULL_DOWN) },
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// IRG triggers, can be or'd together
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{ MP_OBJ_NEW_QSTR(MP_QSTR_IRQ_RISING), MP_OBJ_NEW_SMALL_INT(GPIO_PIN_INTR_POSEDGE) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_IRQ_FALLING), MP_OBJ_NEW_SMALL_INT(GPIO_PIN_INTR_NEGEDGE) },
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};
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STATIC MP_DEFINE_CONST_DICT(pyb_pin_locals_dict, pyb_pin_locals_dict_table);
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const mp_obj_type_t pyb_pin_type = {
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{ &mp_type_type },
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.name = MP_QSTR_Pin,
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.print = pyb_pin_print,
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.make_new = pyb_pin_make_new,
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.call = pyb_pin_call,
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.locals_dict = (mp_obj_t)&pyb_pin_locals_dict,
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};
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/******************************************************************************/
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// Pin IRQ object
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STATIC const mp_obj_type_t pin_irq_type;
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STATIC const pin_irq_obj_t pin_irq_obj[16] = {
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{{&pin_irq_type}, 0},
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{{&pin_irq_type}, 1},
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{{&pin_irq_type}, 2},
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{{&pin_irq_type}, 3},
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{{&pin_irq_type}, 4},
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{{&pin_irq_type}, 5},
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{{&pin_irq_type}, 6},
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{{&pin_irq_type}, 7},
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{{&pin_irq_type}, 8},
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{{&pin_irq_type}, 9},
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{{&pin_irq_type}, 10},
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{{&pin_irq_type}, 11},
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{{&pin_irq_type}, 12},
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{{&pin_irq_type}, 13},
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{{&pin_irq_type}, 14},
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{{&pin_irq_type}, 15},
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};
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STATIC mp_obj_t pin_irq_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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pin_irq_obj_t *self = self_in;
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mp_arg_check_num(n_args, n_kw, 0, 0, false);
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pin_intr_handler(1 << self->phys_port);
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return mp_const_none;
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}
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STATIC mp_obj_t pin_irq_trigger(size_t n_args, const mp_obj_t *args) {
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pin_irq_obj_t *self = args[0];
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uint32_t orig_trig = GET_TRIGGER(self->phys_port);
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if (n_args == 2) {
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// set trigger
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SET_TRIGGER(self->phys_port, mp_obj_get_int(args[1]));
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}
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// return original trigger value
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return MP_OBJ_NEW_SMALL_INT(orig_trig);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pin_irq_trigger_obj, 1, 2, pin_irq_trigger);
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STATIC const mp_rom_map_elem_t pin_irq_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_trigger), MP_ROM_PTR(&pin_irq_trigger_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(pin_irq_locals_dict, pin_irq_locals_dict_table);
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STATIC const mp_obj_type_t pin_irq_type = {
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{ &mp_type_type },
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.name = MP_QSTR_IRQ,
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.call = pin_irq_call,
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.locals_dict = (mp_obj_dict_t*)&pin_irq_locals_dict,
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};
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