ulink_cmd struct

OpenULINK command (OpenULINK command queue element). For the OUT direction payload, things are quite easy: Payload is stored in a rather small array (up to 63 bytes), the payload is always allocated by the function generating the command and freed by ulink_clear_queue(). For the IN direction payload, things get a little bit more complicated: The maximum IN payload size for a single command is 64 bytes. Assume that a single OpenOCD command needs to scan 256 bytes. This results in the generation of four OpenULINK commands. The function generating these commands shall allocate an uint8_t[256] array. Each command's #payload_in pointer shall point to the corresponding offset where IN data shall be placed, while #payload_in_start shall point to the first element of the 256 byte array. - first command: #payload_in_start + 0 - second command: #payload_in_start + 64 - third command: #payload_in_start + 128 - fourth command: #payload_in_start + 192 The last command sets #needs_postprocessing to true.