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FTC_STATUS
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I2C_SetClock
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(FTC_HANDLE ftHandle, DWORD dwClockDivisor, LPDWORD lpdwClockFrequencyHz)
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Parameters
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ftHandle
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Handle of the device.
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dwClockDivisor
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Specifies a clock divisor which will be used to set the frequency for clocking data in and out of the FT2232C device.
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lpdwClockFrequencyHz
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Pointer to a variable of type DWORD which receives the actual frequency in Hz that data will be clocked in and out of the FT2232C device at.
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Return Value
FTC_SUCCESS if successful, otherwise the return value is one of the following FTC error codes:
FTC_INVALID_HANDLE
FTC_INVALID_CLOCK_DIVISOR
FTC_FAILED_TO_COMPLETE_COMMAND
FTC_IO_ERROR
Remarks
The valid range for dwClockDivisor is 0 to 65535. The highest clock frequency is represented by 0 which is equivalent to 6MHz and the lowest clock frequency is represented by 65535 which is equivalent to 91Hz. This can be calculated using the following formula:
dwClockFrequency = 12MHz / ((1 + dwClockDivisor) * 2)
I2C_SetClock will return the actual frequency in Hz for the current divisor value. The clock frequancy in Hz can also be calculated using I2C_GetClock.
Example
FTC_STATUS Status = FTC_SUCCESS;
FTC_HANDLE ftHandle;
DWORD dwClockDivisor = 0;
DWORD dwClockFrequencyHz = 0;
Status = I2C_SetClock(ftHandle, dwClockDivisor, &dwClockFrequencyHz);