84 lines
2.6 KiB
C
84 lines
2.6 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) 2020 microDev
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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 "peripherals/i2c.h"
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typedef enum {
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STATUS_FREE = 0,
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STATUS_IN_USE,
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STATUS_NEVER_RESET
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} i2c_status_t;
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static i2c_status_t i2c_status[I2C_NUM_MAX];
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void i2c_reset(void) {
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for (i2c_port_t num = 0; num < (i2c_port_t)I2C_NUM_MAX; num++) {
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if (i2c_status[num] == STATUS_IN_USE) {
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i2c_driver_delete(num);
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i2c_status[num] = STATUS_FREE;
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}
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}
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}
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void never_reset_i2c(i2c_port_t num) {
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i2c_status[num] = STATUS_NEVER_RESET;
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}
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esp_err_t peripherals_i2c_init(i2c_port_t num, const i2c_config_t *i2c_conf) {
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esp_err_t err = i2c_param_config(num, i2c_conf);
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if (err != ESP_OK) {
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return err;
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}
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size_t rx_buf_len = 0;
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size_t tx_buf_len = 0;
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if (i2c_conf->mode == I2C_MODE_SLAVE) {
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rx_buf_len = 256;
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tx_buf_len = 256;
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}
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return i2c_driver_install(num, i2c_conf->mode, rx_buf_len, tx_buf_len, 0);
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}
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void peripherals_i2c_deinit(i2c_port_t num) {
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i2c_reset_rx_fifo(num);
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i2c_reset_tx_fifo(num);
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i2c_driver_delete(num);
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i2c_status[num] = STATUS_FREE;
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}
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i2c_port_t peripherals_i2c_get_free_num(void) {
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i2c_port_t i2c_num = I2C_NUM_MAX;
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for (i2c_port_t num = 0; num < (int)I2C_NUM_MAX; num++) {
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if (i2c_status[num] == STATUS_FREE) {
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i2c_num = num;
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break;
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}
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}
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if (i2c_num != I2C_NUM_MAX) {
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i2c_status[i2c_num] = STATUS_IN_USE;
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}
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return i2c_num;
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}
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