extmod: Add generic machine.I2C class, with bit-bang I2C.
Should work on any machine that provides the correct pin functions.
This commit is contained in:
Damien George
parent
53ad681ed1
commit
d083712224
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/*
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* This file is part of the MicroPython 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) 2016 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 "py/mphal.h"
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#include "py/runtime.h"
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#include "extmod/machine_i2c.h"
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#if MICROPY_PY_MACHINE_I2C
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typedef struct _machine_i2c_obj_t {
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mp_obj_base_t base;
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uint32_t us_delay;
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mp_hal_pin_obj_t *scl;
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mp_hal_pin_obj_t *sda;
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} machine_i2c_obj_t;
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STATIC void mp_hal_i2c_delay(machine_i2c_obj_t *self) {
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// We need to use an accurate delay to get acceptable I2C
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// speeds (eg 1us should be not much more than 1us).
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mp_hal_delay_us_fast(self->us_delay);
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}
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STATIC void mp_hal_i2c_scl_low(machine_i2c_obj_t *self) {
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mp_hal_pin_low(self->scl);
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}
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STATIC void mp_hal_i2c_scl_release(machine_i2c_obj_t *self) {
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mp_hal_pin_od_high(self->scl);
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}
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STATIC void mp_hal_i2c_sda_low(machine_i2c_obj_t *self) {
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mp_hal_pin_low(self->sda);
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}
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STATIC void mp_hal_i2c_sda_release(machine_i2c_obj_t *self) {
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mp_hal_pin_od_high(self->sda);
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}
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STATIC int mp_hal_i2c_sda_read(machine_i2c_obj_t *self) {
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return mp_hal_pin_read(self->sda);
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}
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STATIC void mp_hal_i2c_start(machine_i2c_obj_t *self) {
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mp_hal_i2c_sda_release(self);
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mp_hal_i2c_delay(self);
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mp_hal_i2c_scl_release(self);
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mp_hal_i2c_delay(self);
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mp_hal_i2c_sda_low(self);
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mp_hal_i2c_delay(self);
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}
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STATIC void mp_hal_i2c_stop(machine_i2c_obj_t *self) {
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mp_hal_i2c_delay(self);
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mp_hal_i2c_sda_low(self);
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mp_hal_i2c_delay(self);
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mp_hal_i2c_scl_release(self);
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mp_hal_i2c_delay(self);
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mp_hal_i2c_sda_release(self);
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mp_hal_i2c_delay(self);
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}
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STATIC void mp_hal_i2c_init(machine_i2c_obj_t *self, uint32_t freq) {
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self->us_delay = 500000 / freq;
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if (self->us_delay == 0) {
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self->us_delay = 1;
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}
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mp_hal_pin_config_od(self->scl);
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mp_hal_pin_config_od(self->sda);
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mp_hal_i2c_stop(self);
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}
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STATIC int mp_hal_i2c_write_byte(machine_i2c_obj_t *self, uint8_t val) {
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mp_hal_i2c_delay(self);
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mp_hal_i2c_scl_low(self);
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for (int i = 7; i >= 0; i--) {
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if ((val >> i) & 1) {
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mp_hal_i2c_sda_release(self);
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} else {
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mp_hal_i2c_sda_low(self);
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}
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mp_hal_i2c_delay(self);
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mp_hal_i2c_scl_release(self);
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mp_hal_i2c_delay(self);
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mp_hal_i2c_scl_low(self);
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}
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mp_hal_i2c_sda_release(self);
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mp_hal_i2c_delay(self);
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mp_hal_i2c_scl_release(self);
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mp_hal_i2c_delay(self);
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int ret = mp_hal_i2c_sda_read(self);
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mp_hal_i2c_delay(self);
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mp_hal_i2c_scl_low(self);
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return !ret;
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}
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STATIC void mp_hal_i2c_write(machine_i2c_obj_t *self, uint8_t addr, uint8_t *data, size_t len) {
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mp_hal_i2c_start(self);
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if (!mp_hal_i2c_write_byte(self, addr << 1)) {
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goto er;
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}
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while (len--) {
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if (!mp_hal_i2c_write_byte(self, *data++)) {
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goto er;
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}
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}
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return;
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er:
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mp_hal_i2c_stop(self);
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "I2C bus error"));
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}
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STATIC int mp_hal_i2c_read_byte(machine_i2c_obj_t *self, uint8_t *val) {
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mp_hal_i2c_delay(self);
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mp_hal_i2c_scl_low(self);
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mp_hal_i2c_delay(self);
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uint8_t data = 0;
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for (int i = 7; i >= 0; i--) {
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mp_hal_i2c_scl_release(self);
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mp_hal_i2c_delay(self);
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data = (data << 1) | mp_hal_i2c_sda_read(self);
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mp_hal_i2c_scl_low(self);
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mp_hal_i2c_delay(self);
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}
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*val = data;
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mp_hal_i2c_scl_release(self);
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mp_hal_i2c_delay(self);
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mp_hal_i2c_scl_low(self);
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mp_hal_i2c_delay(self);
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return 1; // success
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}
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STATIC void mp_hal_i2c_read(machine_i2c_obj_t *self, uint8_t addr, uint8_t *data, size_t len) {
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mp_hal_i2c_start(self);
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if (!mp_hal_i2c_write_byte(self, (addr << 1) | 1)) {
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goto er;
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}
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while (len--) {
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if (!mp_hal_i2c_read_byte(self, data++)) {
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goto er;
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}
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}
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return;
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er:
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mp_hal_i2c_stop(self);
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "I2C bus error"));
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}
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/******************************************************************************/
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// MicroPython bindings for I2C
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STATIC void machine_i2c_obj_init_helper(machine_i2c_obj_t *self, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_scl, ARG_sda, ARG_freq };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_scl, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_sda, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 400000} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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self->scl = mp_hal_get_pin_obj(args[ARG_scl].u_obj);
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self->sda = mp_hal_get_pin_obj(args[ARG_sda].u_obj);
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mp_hal_i2c_init(self, args[ARG_freq].u_int);
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}
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STATIC mp_obj_t machine_i2c_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 0, MP_OBJ_FUN_ARGS_MAX, true);
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machine_i2c_obj_t *self = m_new_obj(machine_i2c_obj_t);
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self->base.type = &machine_i2c_type;
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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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machine_i2c_obj_init_helper(self, n_args, args, &kw_args);
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return (mp_obj_t)self;
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}
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STATIC mp_obj_t machine_i2c_obj_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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machine_i2c_obj_init_helper(args[0], n_args - 1, args + 1, kw_args);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(machine_i2c_init_obj, 1, machine_i2c_obj_init);
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STATIC mp_obj_t machine_i2c_scan(mp_obj_t self_in) {
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machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_obj_t list = mp_obj_new_list(0, NULL);
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// 7-bit addresses 0b0000xxx and 0b1111xxx are reserved
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for (int addr = 0x08; addr < 0x78; ++addr) {
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mp_hal_i2c_start(self);
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int ack = mp_hal_i2c_write_byte(self, (addr << 1) | 1);
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if (ack) {
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mp_obj_list_append(list, MP_OBJ_NEW_SMALL_INT(addr));
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}
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mp_hal_i2c_stop(self);
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}
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return list;
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}
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MP_DEFINE_CONST_FUN_OBJ_1(machine_i2c_scan_obj, machine_i2c_scan);
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STATIC mp_obj_t machine_i2c_start(mp_obj_t self_in) {
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machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_hal_i2c_start(self);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_1(machine_i2c_start_obj, machine_i2c_start);
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STATIC mp_obj_t machine_i2c_stop(mp_obj_t self_in) {
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machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_hal_i2c_stop(self);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_1(machine_i2c_stop_obj, machine_i2c_stop);
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STATIC mp_obj_t machine_i2c_readinto(mp_obj_t self_in, mp_obj_t buf_in) {
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machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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// get the buffer to read into
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_WRITE);
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// do the read
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uint8_t *dest = bufinfo.buf;
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while (bufinfo.len--) {
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if (!mp_hal_i2c_read_byte(self, dest++)) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "I2C bus error"));
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}
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}
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(machine_i2c_readinto_obj, machine_i2c_readinto);
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STATIC mp_obj_t machine_i2c_write(mp_obj_t self_in, mp_obj_t buf_in) {
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machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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// get the buffer to write from
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ);
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// do the write
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uint8_t *src = bufinfo.buf;
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while (bufinfo.len--) {
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if (!mp_hal_i2c_write_byte(self, *src++)) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "I2C bus error"));
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}
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}
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(machine_i2c_write_obj, machine_i2c_write);
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STATIC mp_obj_t machine_i2c_readfrom(mp_obj_t self_in, mp_obj_t addr_in, mp_obj_t nbytes_in) {
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machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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vstr_t vstr;
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vstr_init_len(&vstr, mp_obj_get_int(nbytes_in));
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mp_hal_i2c_read(self, mp_obj_get_int(addr_in), (uint8_t*)vstr.buf, vstr.len);
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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MP_DEFINE_CONST_FUN_OBJ_3(machine_i2c_readfrom_obj, machine_i2c_readfrom);
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STATIC mp_obj_t machine_i2c_readfrom_into(mp_obj_t self_in, mp_obj_t addr_in, mp_obj_t buf_in) {
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machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_WRITE);
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mp_hal_i2c_read(self, mp_obj_get_int(addr_in), (uint8_t*)bufinfo.buf, bufinfo.len);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_3(machine_i2c_readfrom_into_obj, machine_i2c_readfrom_into);
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STATIC mp_obj_t machine_i2c_writeto(mp_obj_t self_in, mp_obj_t addr_in, mp_obj_t buf_in) {
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machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ);
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mp_hal_i2c_write(self, mp_obj_get_int(addr_in), bufinfo.buf, bufinfo.len);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_3(machine_i2c_writeto_obj, machine_i2c_writeto);
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STATIC mp_obj_t machine_i2c_readfrom_mem(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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mp_not_implemented("I2C.readfrom_mem");
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(machine_i2c_readfrom_mem_obj, 1, machine_i2c_readfrom_mem);
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STATIC mp_obj_t machine_i2c_readfrom_mem_into(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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mp_not_implemented("I2C.readfrom_mem_into");
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(machine_i2c_readfrom_mem_into_obj, 1, machine_i2c_readfrom_mem_into);
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STATIC mp_obj_t machine_i2c_writeto_mem(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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mp_not_implemented("I2C.writeto_mem");
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(machine_i2c_writeto_mem_obj, 1, machine_i2c_writeto_mem);
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STATIC const mp_rom_map_elem_t machine_i2c_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&machine_i2c_init_obj) },
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{ MP_ROM_QSTR(MP_QSTR_scan), MP_ROM_PTR(&machine_i2c_scan_obj) },
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// primitive I2C operations
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{ MP_ROM_QSTR(MP_QSTR_start), MP_ROM_PTR(&machine_i2c_start_obj) },
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{ MP_ROM_QSTR(MP_QSTR_stop), MP_ROM_PTR(&machine_i2c_stop_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&machine_i2c_readinto_obj) },
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{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&machine_i2c_write_obj) },
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// standard bus operations
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{ MP_ROM_QSTR(MP_QSTR_readfrom), MP_ROM_PTR(&machine_i2c_readfrom_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readfrom_into), MP_ROM_PTR(&machine_i2c_readfrom_into_obj) },
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{ MP_ROM_QSTR(MP_QSTR_writeto), MP_ROM_PTR(&machine_i2c_writeto_obj) },
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// memory operations
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{ MP_ROM_QSTR(MP_QSTR_readfrom_mem), MP_ROM_PTR(&machine_i2c_readfrom_mem_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readfrom_mem_into), MP_ROM_PTR(&machine_i2c_readfrom_mem_into_obj) },
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{ MP_ROM_QSTR(MP_QSTR_writeto_mem), MP_ROM_PTR(&machine_i2c_writeto_mem_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(machine_i2c_locals_dict, machine_i2c_locals_dict_table);
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const mp_obj_type_t machine_i2c_type = {
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{ &mp_type_type },
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.name = MP_QSTR_I2C,
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.make_new = machine_i2c_make_new,
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.locals_dict = (mp_obj_dict_t*)&machine_i2c_locals_dict,
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};
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#endif // MICROPY_PY_MACHINE_I2C
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@ -0,0 +1,34 @@
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/*
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* This file is part of the MicroPython project, http://micropython.org/
|
||||
*
|
||||
* The MIT License (MIT)
|
||||
*
|
||||
* Copyright (c) 2016 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.
|
||||
*/
|
||||
|
||||
#ifndef __MICROPY_INCLUDED_EXTMOD_MACHINE_I2C_H__
|
||||
#define __MICROPY_INCLUDED_EXTMOD_MACHINE_I2C_H__
|
||||
|
||||
#include "py/obj.h"
|
||||
|
||||
extern const mp_obj_type_t machine_i2c_type;
|
||||
|
||||
#endif // __MICROPY_INCLUDED_EXTMOD_MACHINE_I2C_H__
|
||||
|
|
@ -837,6 +837,10 @@ typedef double mp_float_t;
|
|||
#define MICROPY_PY_MACHINE (0)
|
||||
#endif
|
||||
|
||||
#ifndef MICROPY_PY_MACHINE_I2C
|
||||
#define MICROPY_PY_MACHINE_I2C (0)
|
||||
#endif
|
||||
|
||||
#ifndef MICROPY_PY_USSL
|
||||
#define MICROPY_PY_USSL (0)
|
||||
#endif
|
||||
|
|
|
|||
1
py/py.mk
1
py/py.mk
|
|
@ -167,6 +167,7 @@ PY_O_BASENAME = \
|
|||
../extmod/moduhashlib.o \
|
||||
../extmod/modubinascii.o \
|
||||
../extmod/machine_mem.o \
|
||||
../extmod/machine_i2c.o \
|
||||
../extmod/modussl.o \
|
||||
../extmod/modurandom.o \
|
||||
../extmod/modwebsocket.o \
|
||||
|
|
|
|||
|
|
@ -681,6 +681,26 @@ Q(mem16)
|
|||
Q(mem32)
|
||||
#endif
|
||||
|
||||
#if MICROPY_PY_MACHINE_I2C
|
||||
Q(I2C)
|
||||
Q(init)
|
||||
Q(scl)
|
||||
Q(sda)
|
||||
Q(freq)
|
||||
Q(scan)
|
||||
Q(start)
|
||||
Q(stop)
|
||||
Q(read)
|
||||
Q(readinto)
|
||||
Q(write)
|
||||
Q(readfrom)
|
||||
Q(readfrom_into)
|
||||
Q(writeto)
|
||||
Q(readfrom_mem)
|
||||
Q(readfrom_mem_into)
|
||||
Q(writeto_mem)
|
||||
#endif
|
||||
|
||||
#if MICROPY_PY_USSL
|
||||
Q(ussl)
|
||||
Q(wrap_socket)
|
||||
|
|
|
|||
Loading…
Reference in New Issue