FTC_STATUS
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JTAG_AddReadCmd
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(BOOL bInstructionTestData, DWORD dwNumBitsToRead, DWORD dwTapControllerState)
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Parameters
bInstructionTestData
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Selects the instruction register (TRUE) or the test register (FALSE) to write data to.
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dwNumBitsToRead
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Number of bits to be read from the external device. Valid range is 2 to 524280.
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dwTapControllerState
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State that the Test Access Port (TAP) controller will be left in.
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Return Value
FTC_SUCCESS if successful, otherwise the return value is one of the following FTC error codes:
FTC_INVALID_NUMBER_BITS
FTC_INVALID_TAP_CONTROLLER_STATE
FTC_COMMAND_SEQUENCE_BUFFER_FULL
Remarks
Do not invoke JTAG_Write, JTAG_READ or JTAG_WriteRead functions while constructing a sequence of commands as this will clear the sequence of commands and associated data from the internal command buffer.
Calling this function is equivalent to adding the commands and data from a JTAG_Read call to the internal command buffer.
This function can be used with JTAG_ClearCmdSequence, JTAG_AddWriteCmd, JTAG_AddWriteReadCmd and JTAG_ExecuteCmdSequence to buffer a long list of commands and data which can then be sent to the FT2232C in one go. This can provide faster data transfer rates in some applications.
Example
FTC_STATUS Status = FTC_SUCCESS;
Status = JTAG_AddReadCmd(true, 32, RUN_TEST_IDLE_STATE);