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U2C-12 USB-I2C/SPI/GPIO Interface Adapter Users Manual

  Prev   3.2. I2C bus configuration routinesHome 3.2.2. U2C_GetI2cFreq()   Next  

3.2.1. U2C_SetI2cFreq()

U2C_RESULT U2C_SetI2cFreq(
      HANDLE hDevice,
      BYTE Frequency
);

The U2C_SetI2cFreq() function configures I2C bus frequency.

Parameters:

hDevice

Handle to the U2C-12 device.

Frequency

The frequency of I2C bus, where:

  • 0 corresponds to I 2 C bus fast mode (400 kHz).
  • 1 corresponds to I 2 C bus standard mode (100 kHz).
  • 1+n corresponds to clock period of I 2 C bus equal to 10 + 2*n uS.
For convenience following constants were introduced:
U2C_I2C_FREQ_FAST I2C bus fast mode (400 kHz)
U2C_I2C_FREQ_STD I2C bus standard mode (100 kHz)
U2C_I2C_FREQ_83KHZ 83 kHz
U2C_I2C_FREQ_71KHZ 71 kHz
U2C_I2C_FREQ_62KHZ 62 kHz
U2C_I2C_FREQ_50KHZ 50 kHz
U2C_I2C_FREQ_25KHZ 25 kHz
U2C_I2C_FREQ_10KHZ 10 kHz
U2C_I2C_FREQ_5KHZ 5 kHz
U2C_I2C_FREQ_2KHZ 2 kHz

Return values:

U2C_SUCCESS

The I2C bus frequency value was successfully set.

U2C_HARDWARE_NOT_FOUND

U2C-12 device referenced by hDevice handle was not found.

  Prev   3.2. I2C bus configuration routinesHome    3.2.2. U2C_GetI2cFreq()   Next