17

ATSAM9743

1773B–DRMSD–11/02

Breakpoint Settings

Breakpoint is set by replacing a firmware instruction by the single word ROM Debug instruc-

tion. This instruction jumps into the ROM debug code, saves the caller program context and

sends data AAH, 55H to MIDI_OUT. This signals the 9743CV program that a breakpoint has

been reached. Further program execution will be done by restoring the instruction at the

breakpoint address, modifying the context stack (IP = IP-1) and issuing a GR command. The

GR command restores the user program context and resumes execution at the restored

instruction.

Debugger

Requirements

The debugger needs the following resources to operate:

•

One word at address 18H in IRAM

•

18 words of stack

•

8 words starting at address 20:0000H in built-in SRAM for FIFO

An additional 32 words of SRAM (20:0008H to 20:0027H) are needed for block Flash pro-

gramming (WRFLASH).

Specific Flash functions such as chip erase, signature fuse, etc. can be externally triggered by

using combinations of the above commands.

WRBLOCK

0CH

adl, adh, pl,

ph, sizel,

sizeh, 2*size

data bytes

Ack (0ACH)

Write size words to external memory starting at address ph/pl:adh/adl. This will

NOT work if the address is in the Flash range. Use WRFLASH command for

block programming of the built-in Flash.

WRFLASH

0DH

adl, adh, size,

2*size bytes

Ack (0ACH)

Write size words (max 32) to Flash, starting at address 8000H + adh/adl. The

block written shall not cross a 32 words Flash page. Before actually writing to

the Flash, Ack is returned immediately after the last data byte is received,

thereby allowing masked time Flash programming.

CHKFLASH

0EH

Dummy

Ack (0ACH)

Ack is returned when the current Flash write has been completed, thus

allowing monitoring of the completion of the last WRFLASH.

Table 12. Parameters for MIDI_IN/MIDI_OUT Commands and Answers (Continued)