circuitpython/ports/espressif/peripherals/i2c.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 microDev
*
* 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 "peripherals/i2c.h"
typedef enum {
STATUS_FREE = 0,
STATUS_IN_USE,
STATUS_NEVER_RESET
} i2c_status_t;
static i2c_status_t i2c_status[I2C_NUM_MAX];
void i2c_reset(void) {
for (i2c_port_t num = 0; num < I2C_NUM_MAX; num++) {
if (i2c_status[num] == STATUS_IN_USE) {
i2c_driver_delete(num);
i2c_status[num] = STATUS_FREE;
}
}
}
void never_reset_i2c(i2c_port_t num) {
i2c_status[num] = STATUS_NEVER_RESET;
}
esp_err_t peripherals_i2c_init(i2c_port_t num, const i2c_config_t *i2c_conf) {
esp_err_t err = i2c_param_config(num, i2c_conf);
if (err != ESP_OK) {
return err;
}
size_t rx_buf_len = 0;
size_t tx_buf_len = 0;
if (i2c_conf->mode == I2C_MODE_SLAVE) {
rx_buf_len = 256;
tx_buf_len = 256;
}
return i2c_driver_install(num, i2c_conf->mode, rx_buf_len, tx_buf_len, 0);
}
void peripherals_i2c_deinit(i2c_port_t num) {
i2c_reset_rx_fifo(num);
i2c_reset_tx_fifo(num);
i2c_driver_delete(num);
i2c_status[num] = STATUS_FREE;
}
i2c_port_t peripherals_i2c_get_free_num(void) {
i2c_port_t i2c_num = I2C_NUM_MAX;
for (i2c_port_t num = 0; num < I2C_NUM_MAX; num++) {
if (i2c_status[num] == STATUS_FREE) {
i2c_num = num;
break;
}
}
if (i2c_num != I2C_NUM_MAX) {
i2c_status[i2c_num] = STATUS_IN_USE;
}
return i2c_num;
}