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