0cd62852da
* Addition of a i2cReset method and timeout handling for the case where the i2c hardware FSM (state machine) gets stuck in a busy state. * Use newly added i2cReset function within the wire library.
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _ESP32_HAL_I2C_H_
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#define _ESP32_HAL_I2C_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <stdbool.h>
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typedef enum {
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I2C_ERROR_OK,
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I2C_ERROR_DEV,
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I2C_ERROR_ACK,
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I2C_ERROR_TIMEOUT,
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I2C_ERROR_BUS,
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I2C_ERROR_BUSY
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} i2c_err_t;
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struct i2c_struct_t;
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typedef struct i2c_struct_t i2c_t;
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i2c_t * i2cInit(uint8_t i2c_num, uint16_t slave_addr, bool addr_10bit_en);
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//call this after you setup the bus and pins to send empty packet
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//required because when pins are attached, they emit pulses that lock the bus
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void i2cInitFix(i2c_t * i2c);
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i2c_err_t i2cSetFrequency(i2c_t * i2c, uint32_t clk_speed);
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uint32_t i2cGetFrequency(i2c_t * i2c);
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i2c_err_t i2cAttachSCL(i2c_t * i2c, int8_t scl);
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i2c_err_t i2cDetachSCL(i2c_t * i2c, int8_t scl);
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i2c_err_t i2cAttachSDA(i2c_t * i2c, int8_t sda);
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i2c_err_t i2cDetachSDA(i2c_t * i2c, int8_t sda);
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i2c_err_t i2cWrite(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uint8_t len, bool sendStop);
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i2c_err_t i2cRead(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uint8_t len, bool sendStop);
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void i2cReset(i2c_t* i2c);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ESP32_HAL_I2C_H_ */
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