182 lines
6.4 KiB
C
182 lines
6.4 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2019 Damien P. George
|
|
*
|
|
* 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 "py/runtime.h"
|
|
#include "py/mphal.h"
|
|
#include "py/mperrno.h"
|
|
#include "extmod/machine_i2c.h"
|
|
#include "modmachine.h"
|
|
|
|
#include "driver/i2c.h"
|
|
|
|
#define I2C_0_DEFAULT_SCL (GPIO_NUM_18)
|
|
#define I2C_0_DEFAULT_SDA (GPIO_NUM_19)
|
|
#define I2C_1_DEFAULT_SCL (GPIO_NUM_25)
|
|
#define I2C_1_DEFAULT_SDA (GPIO_NUM_26)
|
|
|
|
#define I2C_DEFAULT_TIMEOUT_US (10000) // 10ms
|
|
|
|
typedef struct _machine_hw_i2c_obj_t {
|
|
mp_obj_base_t base;
|
|
i2c_port_t port : 8;
|
|
gpio_num_t scl : 8;
|
|
gpio_num_t sda : 8;
|
|
} machine_hw_i2c_obj_t;
|
|
|
|
STATIC machine_hw_i2c_obj_t machine_hw_i2c_obj[I2C_NUM_MAX];
|
|
|
|
STATIC void machine_hw_i2c_init(machine_hw_i2c_obj_t *self, uint32_t freq, uint32_t timeout_us, bool first_init) {
|
|
if (!first_init) {
|
|
i2c_driver_delete(self->port);
|
|
}
|
|
i2c_config_t conf = {
|
|
.mode = I2C_MODE_MASTER,
|
|
.sda_io_num = self->sda,
|
|
.sda_pullup_en = GPIO_PULLUP_ENABLE,
|
|
.scl_io_num = self->scl,
|
|
.scl_pullup_en = GPIO_PULLUP_ENABLE,
|
|
.master.clk_speed = freq,
|
|
};
|
|
i2c_param_config(self->port, &conf);
|
|
i2c_set_timeout(self->port, I2C_APB_CLK_FREQ / 1000000 * timeout_us);
|
|
i2c_driver_install(self->port, I2C_MODE_MASTER, 0, 0, 0);
|
|
}
|
|
|
|
int machine_hw_i2c_transfer(mp_obj_base_t *self_in, uint16_t addr, size_t n, mp_machine_i2c_buf_t *bufs, unsigned int flags) {
|
|
machine_hw_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
|
|
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
|
|
i2c_master_start(cmd);
|
|
i2c_master_write_byte(cmd, addr << 1 | (flags & MP_MACHINE_I2C_FLAG_READ), true);
|
|
|
|
int data_len = 0;
|
|
for (; n--; ++bufs) {
|
|
if (flags & MP_MACHINE_I2C_FLAG_READ) {
|
|
i2c_master_read(cmd, bufs->buf, bufs->len, n == 0 ? I2C_MASTER_LAST_NACK : I2C_MASTER_ACK);
|
|
} else {
|
|
if (bufs->len != 0) {
|
|
i2c_master_write(cmd, bufs->buf, bufs->len, true);
|
|
}
|
|
}
|
|
data_len += bufs->len;
|
|
}
|
|
|
|
if (flags & MP_MACHINE_I2C_FLAG_STOP) {
|
|
i2c_master_stop(cmd);
|
|
}
|
|
|
|
// TODO proper timeout
|
|
esp_err_t err = i2c_master_cmd_begin(self->port, cmd, 100 * (1 + data_len) / portTICK_RATE_MS);
|
|
i2c_cmd_link_delete(cmd);
|
|
|
|
if (err == ESP_FAIL) {
|
|
return -MP_ENODEV;
|
|
} else if (err == ESP_ERR_TIMEOUT) {
|
|
return -MP_ETIMEDOUT;
|
|
} else if (err != ESP_OK) {
|
|
return -abs(err);
|
|
}
|
|
|
|
return data_len;
|
|
}
|
|
|
|
/******************************************************************************/
|
|
// MicroPython bindings for machine API
|
|
|
|
STATIC void machine_hw_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
|
|
machine_hw_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
int h, l;
|
|
i2c_get_period(self->port, &h, &l);
|
|
mp_printf(print, "I2C(%u, scl=%u, sda=%u, freq=%u)",
|
|
self->port, self->scl, self->sda, I2C_APB_CLK_FREQ / (h + l));
|
|
}
|
|
|
|
mp_obj_t machine_hw_i2c_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
|
|
MP_MACHINE_I2C_CHECK_FOR_LEGACY_SOFTI2C_CONSTRUCTION(n_args, n_kw, all_args);
|
|
|
|
// Parse 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_int = 400000} },
|
|
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = I2C_DEFAULT_TIMEOUT_US} },
|
|
};
|
|
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 I2C bus
|
|
mp_int_t i2c_id = mp_obj_get_int(args[ARG_id].u_obj);
|
|
if (!(I2C_NUM_0 <= i2c_id && i2c_id < I2C_NUM_MAX)) {
|
|
mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
|
|
}
|
|
|
|
// Get static peripheral object
|
|
machine_hw_i2c_obj_t *self = (machine_hw_i2c_obj_t *)&machine_hw_i2c_obj[i2c_id];
|
|
|
|
bool first_init = false;
|
|
if (self->base.type == NULL) {
|
|
// Created for the first time, set default pins
|
|
self->base.type = &machine_hw_i2c_type;
|
|
self->port = i2c_id;
|
|
if (self->port == I2C_NUM_0) {
|
|
self->scl = I2C_0_DEFAULT_SCL;
|
|
self->sda = I2C_0_DEFAULT_SDA;
|
|
} else {
|
|
self->scl = I2C_1_DEFAULT_SCL;
|
|
self->sda = I2C_1_DEFAULT_SDA;
|
|
}
|
|
first_init = true;
|
|
}
|
|
|
|
// Set SCL/SDA pins if given
|
|
if (args[ARG_scl].u_obj != MP_OBJ_NULL) {
|
|
self->scl = mp_hal_get_pin_obj(args[ARG_scl].u_obj);
|
|
}
|
|
if (args[ARG_sda].u_obj != MP_OBJ_NULL) {
|
|
self->sda = mp_hal_get_pin_obj(args[ARG_sda].u_obj);
|
|
}
|
|
|
|
// Initialise the I2C peripheral
|
|
machine_hw_i2c_init(self, args[ARG_freq].u_int, args[ARG_timeout].u_int, first_init);
|
|
|
|
return MP_OBJ_FROM_PTR(self);
|
|
}
|
|
|
|
STATIC const mp_machine_i2c_p_t machine_hw_i2c_p = {
|
|
.transfer = machine_hw_i2c_transfer,
|
|
};
|
|
|
|
const mp_obj_type_t machine_hw_i2c_type = {
|
|
{ &mp_type_type },
|
|
.name = MP_QSTR_I2C,
|
|
.print = machine_hw_i2c_print,
|
|
.make_new = machine_hw_i2c_make_new,
|
|
.protocol = &machine_hw_i2c_p,
|
|
.locals_dict = (mp_obj_dict_t *)&mp_machine_soft_i2c_locals_dict,
|
|
};
|