Application works in RAM but not in FLASH - Help NEEDED

Elmer Medina

Other Parts Discussed in Thread: TMS320F2809

I have an application which works in RAM but when I program FLASH is does not completely work.

Here is a description of what I mean by working vs. not working. When I run in RAM all functionality works, when I run in FLASH all functionality works with the exception of a USB Port.

I am using the following communication:

SCI to communicate via a RS-422 interface
SPI to communicate via a USB interface. The DSP talks to a MAX3420E (USB Peripheral Controller with SPI Interface). The DSP initializes the chip and handles the USB host enumeration

I am loading my code in FLASH but running some if it in RAM. When I run from RAM the USB is recognized, if I immediately change my cmd file, recompile, load FLASH and run the USB is recognized - once I cycle power the USB is not recognized. If I reconnect, reload FLASH and run the USB is still not recognized. THIS IS A CLUE BUT I DON'T KNOW WHAT IT MEANS.

Here is a list of what I have done so far:

verified the USB chip is initialized (did this by reading back the initialization registers)
verified I am getting an interrupt request from the USB chip
changed the SPI clock rate

My target is a TMS320F2809 on custom hardware. I am using a Blackhawk USB510L emulator and running CCS Version 5.2.1.00018.

I have attached a copy of the RAM and FLASH cmd and map files.

over 11 years ago

0 Elmer Medina over 11 years ago

Prodigy 170 points

RAM cmd file

0 Elmer Medina over 11 years ago

Prodigy 170 points

FLASH map file

0 Elmer Medina over 11 years ago

Prodigy 170 points

RAM map file

0 Gautam Iyer over 11 years ago

Guru 192875 points

Hi Elmer,

I have an application which works in RAM but when I program FLASH is does not completely work.

What all works from flash and what does not?

Also, did you refer the F280x_flash example code ?

Regards,

Gautam

0 Elmer Medina over 11 years ago in reply to Gautam Iyer

Prodigy 170 points

Gautam ,

What was happening was that my host computer was not able to enumerate my hardware as a USB device.

Yes I did refer to the FLASH example. I was able to resolve the issue. See below for an explanation.

I have a few arrays which I am using as the USB endpoint buffers. When I declared the arrays as follows:

char array[64] = {0}

I thought this would initialize all the elements to zero - well as I found out if running in RAM and when running in FLASH with the emulator hooked up prior to a reboot of the DSP the array is initialized to zero. But when running from FLASH this isn't the case. I added a loop in the function I wrote to initialize my variables to initialize each element in the array to zero. Once I did this I was able to get the host computer to recognize my hardware as a USB device.

0 Gautam Iyer over 11 years ago in reply to Elmer Medina

Guru 192875 points

I added a loop in the function I wrote to initialize my variables to initialize each element in the array to zero.

Yup, you've to follow above procedure to initialize array elements.

Goodluck & Regards,

Gautam

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Application works in RAM but not in FLASH - Help NEEDED