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CC2640R2F: Is there a way to reduce FLASH size used by BLE stack library? Is there a plan to release a version of the chip with larger FLASH?

Koby Fruchtnis28
Intellectual 690 points
Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2541, CC2640, BLE-STACK

Hello.

I've compiled the BLE 5 multi-role example for the CC2640R2F, taken from simplelink_cc2640r2_sdk_1_35_00_33 examples.

The code size is 114KB, leaving 10KB of free space for new code... 

That is quite low, even if I consider that parts of this demo application shall be removed.

  1. Is there a way to reduce the code size used by the stack library?
  2. Is there a plan to release a flavor of the CC2640R2F with 256KB ? (similar to CC2541, which has 2 available FLASH sizes)

Btw, the BLE 4 multi-role example code size is 84KB (30KB less than BLE 5.0).

Thanks

  • 0
    Intellectual 690 points

    More info - the main difference in code size between BLE 4 and BLE 5 binaries is this :

    BLE 5

        C:\ti\simplelink_cc2640r2_sdk_1_35_00_33\source\ti\ble5stack\blelib\ctrl\cc2640_ll_pcxx.a
       ll.o                              12314    8         286    
       ll_common.o                       8694     0         12     
       ble.o                             4600     0         392    
       ll_isr.o                          3122     0         0      
       ll_slave_end_causes.o             2876     0         2      
       ll_scheduler.o                    2264     0         12     
       ll_master_end_causes.o            2192     0         0      
       ll_adv_end_causes.o               1784     0         0      
       ll_privacy.o                      752      0         632    
       ll_init_end_causes.o              1068     0         0      
       ll_scan_end_causes.o              604      0         40     
       ll_enc.o                          496      0         0      
       ll_access_address.o               382      0         0      
       ll_config.o                       0        102       60     
       ll_data.o                         20       0         8      
       ll_wl.o                           28       0         0      
       ll_error_end_causes.o             6        0         0      
    +--+---------------------------------+--------+---------+---------+
       Total:                            41202    110       1444

    BLE 4

     

        C:\ti\simplelink_cc2640r2_sdk_1_35_00_33\source\ti\blestack\blelib\ctrl\cc2640_ll_pcxx.a
       ll.o                              2736    0         200    
       ll_isr.o                          2552    0         0      
       ll_scheduler.o                    2108    0         12     
       ll_master_end_causes.o            1812    0         0      
       ble.o                             1440    0         0      
       ll_init_end_causes.o              940     0         0      
       ll_common.o                       700     0         0      
       ll_scan_end_causes.o              540     0         40     
       ll_access_address.o               382     0         0      
       ll_config.o                       0       102       32     
       ll_data.o                         20      0         8      
       ll_error_end_causes.o             2       0         0      
    +--+---------------------------------+-------+---------+---------+
       Total:                            13232   102       292

        C:\ti\simplelink_cc2640r2_sdk_1_35_00_33\source\ti\ble5stack\blelib\ctrl\cc2640_ll_pcxx.a       ll.o                              12314    8         286           ll_common.o                       8694     0         12            ble.o                             4600     0         392           ll_isr.o                          3122     0         0             ll_slave_end_causes.o             2876     0         2             ll_scheduler.o                    2264     0         12            ll_master_end_causes.o            2192     0         0             ll_adv_end_causes.o               1784     0         0             ll_privacy.o                      752      0         632           ll_init_end_causes.o              1068     0         0             ll_scan_end_causes.o              604      0         40            ll_enc.o                          496      0         0             ll_access_address.o               382      0         0             ll_config.o                       0        102       60            ll_data.o                         20       0         8             ll_wl.o                           28       0         0             ll_error_end_causes.o             6        0         0          +--+---------------------------------+--------+---------+---------+       Total:                            41202    110       1444   

  • 0 in reply to Koby Fruchtnis28
    Guru 735685 points
    Actually, CC2640R2 has 275KB of Nonvolatile Memory Including 128KB of In-System Programmable Flash. Isn't it enough for your application? Which BLE example is your application based on?
  • 0
    TI__Guru** 105180 points
    Hello Koby,

    The protocol stack library configuration for multi-role is larger than peripheral-only due to the need to support master and slave configurations. Additionally, the BLE5 configuration is larger than BLE3 (Bluetooth 4.2) due to additional memory requirements for Bluetooth 5 features. If Bluetooth 4.2 is adequate for your design I suggest using BLE-Stack v3.0.1 to achieve maximum application flash memory availability. The multi_role.c and related menu system for supporting the demo can be removed to save up to 5 kB of flash space.

    Unfortunately we are not able to provide product roadmap details through E2E. I suggest registering for Wireless Connectivity product updates in your myTI account to get the latest device announcements.

    Best wishes
  • 0 in reply to YiKai Chen
    Intellectual 690 points

    See table 3.2 in the data sheet.

    Out of the 275KB, 147KB are ROM. Can't program ROM...

    Still only 10KB left for my application code.