138 lines
4.6 KiB
C
138 lines
4.6 KiB
C
/*
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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) 2013, 2014, 2015 Damien P. George
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* Copyright (c) 2019, NXP
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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 <zephyr.h>
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#include <i2c.h>
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#include "py/runtime.h"
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#include "py/gc.h"
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#include "py/mphal.h"
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#include "py/mperrno.h"
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#include "extmod/machine_i2c.h"
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STATIC const mp_obj_type_t machine_hard_i2c_type;
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typedef struct _machine_hard_i2c_obj_t {
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mp_obj_base_t base;
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struct device *dev;
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bool restart;
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} machine_hard_i2c_obj_t;
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STATIC void machine_hard_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_hard_i2c_obj_t *self = self_in;
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mp_printf(print, "%s", self->dev->config->name);
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}
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mp_obj_t machine_hard_i2c_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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enum { ARG_id, ARG_scl, ARG_sda, ARG_freq, ARG_timeout };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_scl, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_sda, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_obj = MP_OBJ_NULL} },
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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_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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const char *dev_name = mp_obj_str_get_str(args[ARG_id].u_obj);
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struct device *dev = device_get_binding(dev_name);
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if (dev == NULL) {
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mp_raise_ValueError("device not found");
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}
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if ((args[ARG_scl].u_obj != MP_OBJ_NULL) || (args[ARG_sda].u_obj != MP_OBJ_NULL)) {
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mp_raise_NotImplementedError("explicit choice of scl/sda is not implemented");
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}
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if ((args[ARG_freq].u_obj != MP_OBJ_NULL)) {
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mp_raise_NotImplementedError("explicit choice of freq is not implemented");
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}
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if ((args[ARG_timeout].u_obj != MP_OBJ_NULL)) {
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mp_raise_NotImplementedError("explicit choice of timeout is not implemented");
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}
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machine_hard_i2c_obj_t *self = m_new_obj(machine_hard_i2c_obj_t);
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self->base.type = &machine_hard_i2c_type;
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self->dev = dev;
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self->restart = false;
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC int machine_hard_i2c_transfer_single(mp_obj_base_t *self_in, uint16_t addr, size_t len, uint8_t *buf, unsigned int flags) {
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machine_hard_i2c_obj_t *self = (machine_hard_i2c_obj_t *)self_in;
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struct i2c_msg msg;
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int ret;
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msg.buf = (u8_t*)buf;
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msg.len = len;
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msg.flags = 0;
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if (flags & MP_MACHINE_I2C_FLAG_READ) {
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msg.flags |= I2C_MSG_READ;
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} else {
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msg.flags |= I2C_MSG_WRITE;
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}
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if (self->restart) {
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msg.flags |= I2C_MSG_RESTART;
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}
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if (flags & MP_MACHINE_I2C_FLAG_STOP) {
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msg.flags |= I2C_MSG_STOP;
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self->restart = false;
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} else {
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self->restart = true;
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}
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ret = i2c_transfer(self->dev, &msg, 1, addr);
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return (ret < 0) ? -MP_EIO : len;
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}
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STATIC const mp_machine_i2c_p_t machine_hard_i2c_p = {
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.transfer = mp_machine_i2c_transfer_adaptor,
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.transfer_single = machine_hard_i2c_transfer_single,
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};
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STATIC const mp_obj_type_t machine_hard_i2c_type = {
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{ &mp_type_type },
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.name = MP_QSTR_I2C,
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.print = machine_hard_i2c_print,
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.make_new = machine_hard_i2c_make_new,
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.protocol = &machine_hard_i2c_p,
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.locals_dict = (mp_obj_dict_t*)&mp_machine_soft_i2c_locals_dict,
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};
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