36 lines
No EOL
858 B
Markdown
36 lines
No EOL
858 B
Markdown
# Yet another I2C driver for the ESP8266
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This time a driver for the excellent esp-open-rtos. This is a bit banging I2C driver based on the Wikipedia pesudo C code [1].
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### Basic usage
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```C
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#include <i2c.h>
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#define BUS (0)
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#define SCL_PIN (0)
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#define SDA_PIN (2)
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uint8_t slave_addr = 0x20;
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uint8_t reg_addr = 0x1f;
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uint8_t reg_data;
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i2c_init(BUS, SCL_PIN, SDA_PIN, I2C_FREQ_400K);
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// Write 1 byte to slave register
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int err = i2c_slave_write(BUS, slave_addr, ®_addr, &data, 1);
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if (err != 0)
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{
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// do something with error
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}
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// Issue write to slave, sending reg_addr, followed by reading 1 byte
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err = i2c_slave_read(BUS, slave_addr, ®_addr, ®_data, 1);
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```
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For details please see `extras/i2c/i2c.h`.
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The driver is released under the MIT license.
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[1] https://en.wikipedia.org/wiki/I²C#Example_of_bit-banging_the_I.C2.B2C_Master_protocol |