Download USB Multi-Role Device Design by Example by John Hyde PDF

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ISR replacement involves replacing the routine address in the interrupt vector table with a new address. Chaining requires the existing routine address be saved before being replaced by the new routine address. The new routine, when it has finished its task, jumps to the previous routine using this saved address. If you wanted your new routine to execute AFTER the previous routine then you would CALL the previous routine and, once it returned, you would execute your new code. All three examples, pre-processing, post-processing and replacement, are shown in Figure 2-10.

Bat), and program output can be redirected to a text file for later viewing or processing. All of the GNU tools are also command line based and, like DOS commands, may be run interactively or via a command file. The GNU tools call the command scripts, and these are much more sophisticated than their DOS counterparts. The CY3663 DVK includes all of the scripts that you will need for successful development – whether this is rebuilding one of the examples or creating your own. If you don’t want to delve into the “how” the tools work then you can just use them and ignore the fact that they are GNU-based.

53 USB Multi-Role Device Design By Example Input Lists From BIOS Status Retry Iso Output List New NextFrame Iso Iso Int To BIOS 1 Int Int Int 2 Control 4 Control Control Control 3 Bulk In 4 4 Bulk In Bulk In Bulk In 3 BulkOut 4 4 BulkOut BulkOut BulkOut 4 Notes: 1 = if poll time exceeded 2 = if not completed 3 = if NAK or not scheduled 4 = if time available in Frame Status TD_List is NextFrame TD_List from previous frame updated by hardware Figure 4-6. Scheduling Transfers in a frame Let us assume that the EZ-Host/EZ-OTG has just completed a series of data transfers on USB and that BIOS has updated the status information in the TD_List; I call this the Status_List in Figure 4-6.

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