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machine_i2c.c 6.37 KiB
/*
* 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 "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 const mp_obj_type_t machine_hw_i2c_type;
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);