SWD_RAW_SEND

The SWD_RAW_SEND function writes raw data on the SWD pins. Sending data with this function bypasses XJTAG's handling of the bidirectional nature of the protocol, and will clock in the next bitLength bits irrespective of the state of the interface.

For instance this function should be used to send the Switching Mechanism Select Sequence required to enable SWD operation if the SWD block function does not succeed for a particular device.

If SWD pins are shared with JTAG TAP pins, the first JTAG access after using SWD_RAW_SEND will reset the JTAG chain.

SWD_RAW_SEND( INT bitLength, INT data );

Examples

// Switch device to SWD operation using 16-bit 'Switching Mechanism' select sequence.
SWD_RAW_SEND(50, ~0[49..0]);
SWD_RAW_SEND(16, 0xE79E);
SWD_RAW_SEND(50, ~0[49..0]);
SWD_RAW_SEND(5, 0);

// Switch device to JTAG operation using 16-bit 'Switching Mechanism' select sequence.
SWD_RAW_SEND(55, ~0[54..0]);
SWD_RAW_SEND(16, 0xE73C);
SWD_RAW_SEND(5, ~0[4..0]);