44 lines
2 KiB
C
44 lines
2 KiB
C
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/*
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* Copyright © 2020 Wolfgang Christl
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this
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* software and associated documentation files (the “Software”), to deal in the Software
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* without restriction, including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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* to whom the Software is 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 all copies or
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* 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 IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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* FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <driver/i2c.h>
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#include <esp_log.h>
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#define I2C_MASTER_FREQ_HZ 100000 /* 100kHz*/
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#define I2C_MASTER_TX_BUF_DISABLE 0 /* I2C master doesn't need buffer */
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#define I2C_MASTER_RX_BUF_DISABLE 0 /* I2C master doesn't need buffer */
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/**
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* @brief ESP32 I2C init as master
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* @ret ESP32 error code
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*/
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esp_err_t i2c_master_init(void) {
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int i2c_master_port = I2C_NUM_0;
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i2c_config_t conf;
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conf.mode = I2C_MODE_MASTER;
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conf.sda_io_num = CONFIG_LV_TOUCH_I2C_SDA;
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conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
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conf.scl_io_num = CONFIG_LV_TOUCH_I2C_SCL;
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conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
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conf.master.clk_speed = I2C_MASTER_FREQ_HZ;
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i2c_param_config(i2c_master_port, &conf);
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return i2c_driver_install(i2c_master_port, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
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}
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