J-Link / J-Trace User Guide (UM08001) - Microcontrollers

esults.
Clearly 1. is the easiest solution and is recommended.
This information is applicable to the following devices:
• AT91SAM7S (all devices)
• AT91SAM7SE (all devices)
• AT91SAM7X (all devices)
• AT91SAM7XC (all devices)
• AT91SAM7A (all devices)
7.2.1.3 Recommended init sequence
In order to work with an ATMEL AT91SAM7 device, it has to be initialized. The following
paragraph describes the steps of an init sequence. An example for different software
tools, such as J-Link GDB Server, IAR Workbench and RDI, is given.
• Set JTAG speed to 30kHz
• Reset target
• Perform peripheral reset
• Disable watchdog
• Initialize PLL
• Use full JTAG speed
Samples
GDB Sample
# connect to the J-Link gdb server
target remote localhost:2331
monitor flash device = AT91SAM7S256
monitor flash download = 1
monitor flash breakpoints = 1
# Set JTAG speed to 30 kHz
monitor endian little
monitor speed 30
# Reset the target
monitor reset 8
monitor sleep 10
# Perform peripheral reset
monitor long 0xFFFFFD00 = 0xA5000004
monitor sleep 10
# Disable watchdog
monitor long 0xFFFFFD44 = 0x00008000
monitor sleep 10
# Initialize PLL
monitor long 0xFFFFFC20 = 0x00000601
monitor sleep 10
monitor long 0xFFFFFC2C = 0x00480a0e
monitor sleep 10
monitor long 0xFFFFFC30 = 0x00000007
monitor sleep 10
monitor long 0xFFFFFF60 = 0x00480100
monitor sleep 100
# Setup GDB for faster downloads
#set remote memory-write-packet-size 1024
set remote memory-write-packet-size 4096
set remote memory-write-packet-size fixed
monitor speed 12000
break main
load
continue
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