139 lines
4.8 KiB
C
139 lines
4.8 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) 2017 Glenn Ruben Bakke
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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 <string.h>
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "i2c.h"
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#include "hal_twi.h"
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#if MICROPY_PY_MACHINE_HW_I2C
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typedef struct _machine_i2c_obj_t {
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mp_obj_base_t base;
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TWI_HandleTypeDef *i2c;
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} machine_i2c_obj_t;
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TWI_HandleTypeDef I2CHandle0 = {.instance = NULL, .id = 0};
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TWI_HandleTypeDef I2CHandle1 = {.instance = NULL, .id = 1};
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STATIC const machine_i2c_obj_t machine_i2c_obj[] = {
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{{&machine_i2c_type}, &I2CHandle0},
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{{&machine_i2c_type}, &I2CHandle1},
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};
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void i2c_init0(void) {
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// reset the I2C handles
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memset(&I2CHandle0, 0, sizeof(TWI_HandleTypeDef));
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I2CHandle0.instance = TWI_BASE(0);
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memset(&I2CHandle1, 0, sizeof(TWI_HandleTypeDef));
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I2CHandle0.instance = TWI_BASE(1);
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}
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STATIC int i2c_find(mp_obj_t id) {
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// given an integer id
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int i2c_id = mp_obj_get_int(id);
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if (i2c_id >= 0 && i2c_id <= MP_ARRAY_SIZE(machine_i2c_obj)
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&& machine_i2c_obj[i2c_id].i2c != NULL) {
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return i2c_id;
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}
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
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"I2C(%d) does not exist", i2c_id));
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}
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STATIC void i2c_print(const mp_print_t *print, mp_obj_t o, mp_print_kind_t kind) {
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machine_i2c_obj_t *self = o;
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mp_printf(print, "I2C(%u)", self->i2c->id);
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}
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/******************************************************************************/
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/* MicroPython bindings for machine API */
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// for make_new
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enum {
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ARG_NEW_id,
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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 *all_args) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_id, MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_SMALL_INT(-1)} },
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};
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// parse args
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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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if (args[ARG_NEW_id].u_obj == MP_OBJ_NEW_SMALL_INT(-1)) {
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// index -1 does not exist
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return mp_const_none;
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// TODO: raise exception
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}
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// get static peripheral object
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int i2c_id = i2c_find(args[ARG_NEW_id].u_obj);
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const machine_i2c_obj_t *self = &machine_i2c_obj[i2c_id];
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hal_twi_init(self->i2c->instance, &self->i2c->init);
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC const mp_map_elem_t pyb_i2c_locals_dict_table[] = {
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// instance methods
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#if 0
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{ MP_OBJ_NEW_QSTR(MP_QSTR_init), (mp_obj_t)&machine_i2c_init_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_deinit), (mp_obj_t)&machine_i2c_deinit_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_is_ready), (mp_obj_t)&machine_i2c_is_ready_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_scan), (mp_obj_t)&machine_i2c_scan_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_send), (mp_obj_t)&machine_i2c_send_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_recv), (mp_obj_t)&machine_i2c_recv_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_mem_read), (mp_obj_t)&machine_i2c_mem_read_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_mem_write), (mp_obj_t)&machine_i2c_mem_write_obj },
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#endif
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// class constants
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/// \constant MASTER - for initialising the bus to master mode
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/// \constant SLAVE - for initialising the bus to slave mode
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{ MP_OBJ_NEW_QSTR(MP_QSTR_MASTER), MP_OBJ_NEW_SMALL_INT(HAL_TWI_MASTER) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_SLAVE), MP_OBJ_NEW_SMALL_INT(HAL_TWI_SLAVE) },
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};
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STATIC MP_DEFINE_CONST_DICT(pyb_i2c_locals_dict, pyb_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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.print = i2c_print,
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.make_new = machine_i2c_make_new,
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#if 0
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.locals_dict = (mp_obj_t)&machine_i2c_locals_dict
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#endif
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};
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#endif // MICROPY_PY_MACHINE_HW_I2C
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