ADS1.2+TX2440+Jlink test

First, the purpose

Learn how to debug bare metal programs on ARM. Currently, ARM supports three debugging methods: JTAG, Angel, and ARMulator (see below for details). Only JTAG is supported for bare metal program debugging. Since my laptop does not have a parallel port, I cannot use H-JTAG and can only use Jlink debugging.

1. Use JTAG to fully trust ARM internal resources

2. When using Angel, the target board must include a debugging monitor program

3. ARMulator does not require a target board, it is pure software simulation.

2. Hardware Environment

Development board: TX2440A

cpu:S3C2440              

nand flash:K9F2G08U0B (256M+8M)x8bit

norflash:EN29LV160AB (2M) x8bit

SDRAM:K4S561632 x 2 (32M) x 2

Emulator: JLINK V7

Serial cable: USB-RS232 adapter, supports 5V and 3.3V power supply

3. Circuit connection

1. Power supply: switching power supply 5V/2A

2. Serial port: TX2440's com0 port is connected to the computer's serial port

3. JLINK connection: use PC---USB cable----jlinkV7-----10pin adapter cable----TX2440 jtag interface

4. Software Environment

1. SEGGER J-Link V4.08. This is the host computer (driver) of JLINK.

2. ADS1.2. Code writing and simulation software (with AXD debugging tool)

5. Debugging process

1. First, power on the development board, regardless of the boot mode, nandFLASH or NorFLASH (actually tested, because the bare metal program is downloaded to the memory to run, it has nothing to do with nand flash or norflash)

2. Connect JLINK and development board

3. Open the Tianxiang routine test for tianxiangLEDLED.mcp, compile it, and click debug to enter the AXD mode after it is correct.

Configure configure Target…

Configure Target Steps: 1. Click "add" 2. Select the installation directory of JLINK: 3. Select "JLinkRDI.dll", the following interface will appear

4. At this time, select "configure" on the right, jump to the "JTAG" item, and set it as follows (4000K speed is relatively fast and stable):

Use the default values ​​for other items and select "OK". That's it! After completing the above steps, you will be redirected back to the AXD interface. Below the interface, the connection information will be displayed:

5. Load the image (LED.axf file generated previously): Now click the debug button on the AXD interface, and an exception will occur, as shown in the figure below:

From the above error message, we know that the program has run away. Because the program needs to be downloaded to the memory to run, the SDRAM needs to be correctly configured before running the program.

Solution: Before running AXD, run the SDRAM memory configuration script (i.e. 2440init.txt, which must be stored in an English path). Steps to add a configuration script:

1. Click options---configure Interface to enter the following interface.

2. Click Session File, select Run configuration script, and select the path of the configuration script 2440init.txt.

6. Successful operation

After the above settings are successful, click go, and the program pointer points to main(), indicating that Jlink can successfully debug the bare metal program. See the figure below for details.

Other usages are to be improved.