169 lines
6.3 KiB
C
169 lines
6.3 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) 2016-2018 Damien P. George
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* Copyright (c) 2021,2022 Renesas Electronics Corporation
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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/runtime.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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#include "modmachine.h"
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#include "ra_i2c.h"
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#if MICROPY_HW_ENABLE_HW_I2C
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#define DEFAULT_I2C_FREQ (400000)
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#define DEFAULT_I2C_TIMEOUT (1000)
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typedef struct _machine_i2c_obj_t {
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mp_obj_base_t base;
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R_IIC0_Type *i2c_inst;
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uint8_t i2c_id;
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mp_hal_pin_obj_t scl;
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mp_hal_pin_obj_t sda;
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uint32_t freq;
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} machine_i2c_obj_t;
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STATIC machine_i2c_obj_t machine_i2c_obj[] = {
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#if defined(MICROPY_HW_I2C0_SCL)
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{{&machine_i2c_type}, R_IIC0, 0, MICROPY_HW_I2C0_SCL, MICROPY_HW_I2C0_SDA, 0},
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#endif
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#if defined(MICROPY_HW_I2C1_SCL)
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{{&machine_i2c_type}, R_IIC1, 1, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA, 0},
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#endif
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#if defined(MICROPY_HW_I2C2_SCL)
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{{&machine_i2c_type}, R_IIC2, 2, MICROPY_HW_I2C2_SCL, MICROPY_HW_I2C2_SDA, 0},
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#endif
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};
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STATIC int i2c_read(machine_i2c_obj_t *self, uint16_t addr, uint8_t *dest, size_t len, bool stop);
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STATIC int i2c_write(machine_i2c_obj_t *self, uint16_t addr, const uint8_t *src, size_t len, bool stop);
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STATIC int i2c_read(machine_i2c_obj_t *self, uint16_t addr, uint8_t *dest, size_t len, bool stop) {
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bool flag;
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xaction_t action;
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xaction_unit_t unit;
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ra_i2c_xunit_init(&unit, (uint8_t *)dest, (uint32_t)len, true, (void *)NULL);
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ra_i2c_xaction_init(&action, (xaction_unit_t *)&unit, 1, (uint32_t)addr, stop);
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flag = ra_i2c_action_execute(self->i2c_inst, &action, false, DEFAULT_I2C_TIMEOUT);
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return flag? len:-1;
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}
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STATIC int i2c_write(machine_i2c_obj_t *self, uint16_t addr, const uint8_t *src, size_t len, bool stop) {
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bool flag;
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xaction_t action;
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xaction_unit_t unit;
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ra_i2c_xunit_init(&unit, (uint8_t *)src, (uint32_t)len, false, (void *)NULL);
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ra_i2c_xaction_init(&action, (xaction_unit_t *)&unit, 1, (uint32_t)addr, stop);
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flag = ra_i2c_action_execute(self->i2c_inst, &action, false, DEFAULT_I2C_TIMEOUT);
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return flag? len:-1;
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}
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// MicroPython bindings for machine API
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STATIC void machine_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "I2C(%u, freq=%u, scl=%q, sda=%q)",
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self->i2c_id, self->freq, self->scl->name, self->sda->name);
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}
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STATIC void machine_i2c_init(mp_obj_base_t *obj, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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mp_raise_NotImplementedError(MP_ERROR_TEXT("init is not supported."));
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return;
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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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// parse args
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enum { ARG_id, ARG_freq, ARG_scl, ARG_sda };
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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_freq, MP_ARG_INT, {.u_int = DEFAULT_I2C_FREQ} },
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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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};
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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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// get static peripheral object
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bool found = false;
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int i2c_id = mp_obj_get_int(args[ARG_id].u_obj);
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machine_i2c_obj_t *self = (machine_i2c_obj_t *)&machine_i2c_obj[0];
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for (int i = 0; i < MP_ARRAY_SIZE(machine_i2c_obj); i++) {
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if (i2c_id == self->i2c_id) {
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found = true;
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break;
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}
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++self;
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}
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if (found != true) {
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mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
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}
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// here we would check the scl/sda pins and configure them, but it's not implemented
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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_ValueError(MP_ERROR_TEXT("explicit choice of scl/sda is not implemented"));
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}
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if (n_args > 1 || n_kw > 0 || self->freq == 0) {
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self->freq = args[ARG_freq].u_int;
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ra_i2c_init(self->i2c_inst, self->scl->pin, self->sda->pin, self->freq);
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}
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC int machine_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_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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int ret;
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bool stop;
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stop = (flags & MP_MACHINE_I2C_FLAG_STOP)? true : false;
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if (flags & MP_MACHINE_I2C_FLAG_READ) {
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ret = i2c_read(self, addr, buf, len, stop);
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} else {
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ret = i2c_write(self, addr, buf, len, stop);
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}
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return ret;
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}
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STATIC const mp_machine_i2c_p_t machine_i2c_p = {
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.init = machine_i2c_init,
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.transfer = mp_machine_i2c_transfer_adaptor,
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.transfer_single = machine_i2c_transfer_single,
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};
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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 = machine_i2c_print,
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.make_new = machine_i2c_make_new,
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.protocol = &machine_i2c_p,
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.locals_dict = (mp_obj_dict_t *)&mp_machine_i2c_locals_dict,
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};
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#endif // MICROPY_HW_ENABLE_HW_I2C
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