RTOS/CC2640R2F: Fixed allocation in memory map for simpleBlePeripheral

Jayachandran Ramakrishsnan56

Part Number: CC2640R2F

Tool/software: TI-RTOS

Hi,

My question is related to this thread link : https://e2e.ti.com/support/wireless_connectivity/bluetooth_low_energy/f/538/t/637797?RTOS-CC2640R2F-Fixed-allocation-in-memory-map-for-simpleBlePeripheral

I am using RTOS in FLASH not in ROM, so the location 0x20000100 will available for application .

I checked the map file generated and found that there are fixed allocated memory ranges

[0x20000000-0x200000c7] --> Ram Vector Table
[0x20000430-0x2000043f] --> dmaSPI0RxControlTableEntry
[0x20000440-0x2000044f] --> dmaSPI0RxControlTableEntry
[0x20000500-0x2000050f] --> dmaSPI1RxControlTableEntry
[0x20000510-0x2000051f] --> dmaSPI1RxControlTableEntry

because of these my RWDATA Block where my .data and .bss sections are placed only after 0x20000520 leaving the range from 0x200000c8 to 0x2000042F empty.

why the linker is not allocating any memory for 0x200000c8 to 0x2000042F and leave it empty, since we are facing RAM issue , how we can make linker to allocate memory from this location?

thanks and regards,

Jaychandran R

over 6 years ago

0 DavidL over 6 years ago

TI__Mastermind 25045 points

Hello Jaychandran R,

Which SDK version are you using? Could you please attach your map and linker files.

Also if you are having RAM issues, you may want to explore using cache as RAM - software-dl.ti.com/.../memory_management.html

Best regards,

David

0 Jayachandran Ramakrishsnan56 over 6 years ago in reply to DavidL

Intellectual 855 points

Hi David,

I am using the SDK version 1.50.58.

Attached the Memory map and linker file here.

In this linker file i have created a section ".sharedRam_ApplicationAndBootloader" , size of this section is 4bytes (start address 0x20000FC to 0x2000100).

Apart from this Section i don't have any fixed section between (0x200000100 to 0x2000042F). But linker leave it empty.

Thanks and regards,

Jayachandran R

mapAndlinkerFile.zip

0 Jayachandran Ramakrishsnan56 over 6 years ago in reply to Jayachandran Ramakrishsnan56

Intellectual 855 points

Hi David,

In my project we are enabled SPI with uDMA.
As reference with locked answer of this thread, can I use the RAM location 0x2000104 to 0x200043F , if I use the SPI driver with uDMA?

Thanks and Regards,
Jayachandran R

0 DavidL over 6 years ago in reply to Jayachandran Ramakrishsnan56

TI__Mastermind 25045 points

Hi Jayachandran R,

Yes, I do not see any problem with that.

Best regards,

David

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RTOS/CC2640R2F: Fixed allocation in memory map for simpleBlePeripheral