circuitpython/ports/renesas-ra/machine_i2c.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016-2018 Damien P. George
* Copyright (c) 2021,2022 Renesas Electronics Corporation
*
* 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 <string.h>
#include "py/runtime.h"
#include "py/mphal.h"
#include "py/mperrno.h"
#include "extmod/machine_i2c.h"
#include "modmachine.h"
#include "ra_i2c.h"
#if MICROPY_HW_ENABLE_HW_I2C
#define DEFAULT_I2C_FREQ (400000)
#define DEFAULT_I2C_TIMEOUT (1000)
typedef struct _machine_i2c_obj_t {
mp_obj_base_t base;
R_IIC0_Type *i2c_inst;
uint8_t i2c_id;
mp_hal_pin_obj_t scl;
mp_hal_pin_obj_t sda;
uint32_t freq;
} machine_i2c_obj_t;
STATIC machine_i2c_obj_t machine_i2c_obj[] = {
#if defined(MICROPY_HW_I2C0_SCL)
{{&machine_i2c_type}, R_IIC0, 0, MICROPY_HW_I2C0_SCL, MICROPY_HW_I2C0_SDA, 0},
#endif
#if defined(MICROPY_HW_I2C1_SCL)
{{&machine_i2c_type}, R_IIC1, 1, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA, 0},
#endif
#if defined(MICROPY_HW_I2C2_SCL)
{{&machine_i2c_type}, R_IIC2, 2, MICROPY_HW_I2C2_SCL, MICROPY_HW_I2C2_SDA, 0},
#endif
};
STATIC int i2c_read(machine_i2c_obj_t *self, uint16_t addr, uint8_t *dest, size_t len, bool stop);
STATIC int i2c_write(machine_i2c_obj_t *self, uint16_t addr, const uint8_t *src, size_t len, bool stop);
STATIC int i2c_read(machine_i2c_obj_t *self, uint16_t addr, uint8_t *dest, size_t len, bool stop) {
bool flag;
xaction_t action;
xaction_unit_t unit;
ra_i2c_xunit_init(&unit, (uint8_t *)dest, (uint32_t)len, true, (void *)NULL);
ra_i2c_xaction_init(&action, (xaction_unit_t *)&unit, 1, (uint32_t)addr, stop);
flag = ra_i2c_action_execute(self->i2c_inst, &action, false, DEFAULT_I2C_TIMEOUT);
return flag? len:-1;
}
STATIC int i2c_write(machine_i2c_obj_t *self, uint16_t addr, const uint8_t *src, size_t len, bool stop) {
bool flag;
xaction_t action;
xaction_unit_t unit;
ra_i2c_xunit_init(&unit, (uint8_t *)src, (uint32_t)len, false, (void *)NULL);
ra_i2c_xaction_init(&action, (xaction_unit_t *)&unit, 1, (uint32_t)addr, stop);
flag = ra_i2c_action_execute(self->i2c_inst, &action, false, DEFAULT_I2C_TIMEOUT);
return flag? len:-1;
}
// MicroPython bindings for machine API
STATIC void machine_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "I2C(%u, freq=%u, scl=%q, sda=%q)",
self->i2c_id, self->freq, self->scl->name, self->sda->name);
}
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) {
mp_raise_NotImplementedError(MP_ERROR_TEXT("init is not supported."));
return;
}
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) {
// parse args
enum { ARG_id, ARG_freq, ARG_scl, ARG_sda };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_freq, MP_ARG_INT, {.u_int = DEFAULT_I2C_FREQ} },
{ 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_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);
// get static peripheral object
bool found = false;
int i2c_id = mp_obj_get_int(args[ARG_id].u_obj);
machine_i2c_obj_t *self = (machine_i2c_obj_t *)&machine_i2c_obj[0];
for (int i = 0; i < MP_ARRAY_SIZE(machine_i2c_obj); i++) {
if (i2c_id == self->i2c_id) {
found = true;
break;
}
++self;
}
if (found != true) {
mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
}
// here we would check the scl/sda pins and configure them, but it's not implemented
if (args[ARG_scl].u_obj != MP_OBJ_NULL || args[ARG_sda].u_obj != MP_OBJ_NULL) {
mp_raise_ValueError(MP_ERROR_TEXT("explicit choice of scl/sda is not implemented"));
}
if (n_args > 1 || n_kw > 0 || self->freq == 0) {
self->freq = args[ARG_freq].u_int;
ra_i2c_init(self->i2c_inst, self->scl->pin, self->sda->pin, self->freq);
}
return MP_OBJ_FROM_PTR(self);
}
STATIC int machine_i2c_transfer_single(mp_obj_base_t *self_in, uint16_t addr, size_t len, uint8_t *buf, unsigned int flags) {
machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
int ret;
bool stop;
stop = (flags & MP_MACHINE_I2C_FLAG_STOP)? true : false;
if (flags & MP_MACHINE_I2C_FLAG_READ) {
ret = i2c_read(self, addr, buf, len, stop);
} else {
ret = i2c_write(self, addr, buf, len, stop);
}
return ret;
}
STATIC const mp_machine_i2c_p_t machine_i2c_p = {
.init = machine_i2c_init,
.transfer = mp_machine_i2c_transfer_adaptor,
.transfer_single = machine_i2c_transfer_single,
};
const mp_obj_type_t machine_i2c_type = {
{ &mp_type_type },
.name = MP_QSTR_I2C,
.print = machine_i2c_print,
.make_new = machine_i2c_make_new,
.protocol = &machine_i2c_p,
.locals_dict = (mp_obj_dict_t *)&mp_machine_i2c_locals_dict,
};
#endif // MICROPY_HW_ENABLE_HW_I2C