CCS/AM3359: on BBB unable read register

Hao Tan

Part Number: AM3359

Tool/software: Code Composer Studio

Hi,

I used BBB+CCS_V9+XDS100_V2, but in register window some register values cannot be displayed. I have suspended the program.

I can run this example correctly.

CortxA8: Output: **** AM335x BeagleBlack Initialization is in progress ..........
CortxA8: Output: **** AM335x ALL PLL Config for OPP == OPP100 is in progress .........
CortxA8: Output: Input Clock Read from SYSBOOT[15:14]: 24MHz
CortxA8: Output: **** Going to Bypass...
CortxA8: Output: **** Bypassed, changing values...
CortxA8: Output: **** Locking ARM PLL
CortxA8: Output: **** Core Bypassed
CortxA8: Output: **** Now locking Core...
CortxA8: Output: **** Core locked
CortxA8: Output: **** DDR DPLL Bypassed
CortxA8: Output: **** DDR DPLL Locked
CortxA8: Output: **** PER DPLL Bypassed
CortxA8: Output: **** PER DPLL Locked
CortxA8: Output: **** DISP PLL Config is in progress ..........
CortxA8: Output: **** DISP PLL Config is DONE ..........
CortxA8: Output: **** AM335x ALL ADPLL Config for OPP == OPP100 is Done .........
CortxA8: Output: **** AM335x DDR3 EMIF and PHY configuration is in progress.........
CortxA8: Output: EMIF PRCM is in progress .......
CortxA8: Output: EMIF PRCM Done
CortxA8: Output: DDR PHY Configuration in progress
CortxA8: Output: Waiting for VTP Ready .......
CortxA8: Output: VTP is Ready!
CortxA8: Output: DDR PHY CMD0 Register configuration is in progress .......
CortxA8: Output: DDR PHY CMD1 Register configuration is in progress .......
CortxA8: Output: DDR PHY CMD2 Register configuration is in progress .......
CortxA8: Output: DDR PHY DATA0 Register configuration is in progress .......
CortxA8: Output: DDR PHY DATA1 Register configuration is in progress .......
CortxA8: Output: Setting IO control registers.......
CortxA8: Output: EMIF Timing register configuration is in progress .......
CortxA8: Output: EMIF Timing register configuration is done .......
CortxA8: Output: PHY is READY!!
CortxA8: Output: DDR PHY Configuration done
CortxA8: Output: **** AM335x BeagleBlack Initialization is Done ******************

I really need help.

over 6 years ago

0 Ki over 6 years ago

TI__Guru**** 472001 points

Hello,
On many devices, it is common for many peripherals like GPIO to be powered down by default. They must be initialized before they can be used and made accessible.

https://e2e.ti.com/support/wireless-connectivity/bluetooth/f/538/p/797783/2951745#2951745

Try to access the registers again after the GPIO is initialized.

Thanks
ki

0 Hao Tan over 6 years ago in reply to Ki

Prodigy 90 points

I don't know if I correctly understood the initialization you said. If you mean to initialize GPIO in the code, I think I have done it, but I still can't read it.

0 Ki over 6 years ago in reply to Hao Tan

TI__Guru**** 472001 points

Please try to read the registers after the target has run the part of the code that initializes the target. For example, if you set a breakpoint at line 100 and run to it, can you see the GPIO registers?

0 Hao Tan over 6 years ago in reply to Ki

Prodigy 90 points

Thank you very much, I have successfully seen the value of the register. Because not all GPIOs are initialized, only a few GPIOs that have already been initialized can be read. I hope that guys will not make such mistakes.

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CCS/AM3359: on BBB unable read register