This is Bit-bang i2c library and a example using some i2c devices. Some codes comes from "CH554 software development kit for SDCC'.
$ cd projects/bmp180
$ make
$ make pyflash
It uses these i2c devices.
- BMP180 barometric pressure sensor
- ST7032i LCD driver
Default i2c pins (SCLK and SDAT) are P3_3 and P3_4. These GPIO ports can be defined by the symbol I2C_SCLK and I2C_SDAT. You'd initialize the ports to "open-drain output" and "pull-up", or prepare and external pull-up.
