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CCS/CC2640R2F: the bootloder mode cannot be entered after configuring DIO7 as UART RXD、DIO6 as UART TXD、DIO23 as bootloader backdoor enable controller

heng fu
Expert 1020 points
Part Number: CC2640R2F


Tool/software: Code Composer Studio

1、Summary of the problem
The CC2640R2 launchpad is shown in picture 1 , which is the one I use. Now the bootloader function is needed in CC2640R2, the UART TXD should be DIO6 and the UART RXD should be DIO7 , which is the requirement of our company project. Besides this , the bootloader backdoor enable controller should be DIO23.


picture 1

However , the bootloader function cannot work properly after the default IO port is changed . Where am I wrong ?

Two experiments were conducted in CC2640R2. The first experiment uses DIO6 、DIO7 and DIO23 to realize the bootloader function . The second experiment uses the default IO port to realize the bootloader function ,which keeps DIO2 as UART RXD、DIO3 as UART TXD、DIO14 as the bootloader backdoor enable controller .

The bootloader function can work correctly in the first experiment , however , it cannot work properly in the second experiment . Picture 2 shows the result and the IO pin configuration .


picture 2

2、My detail steps of the first experiment

(1) Use the simple_peripheral project in SDK. Firstly , use DIO7 as UART RXD、DIO6 as UART TXD in CC2640R2_LAUNCHXL.h , as picture 3 shows. Then delete the CC2640R2_LAUNCHXL_PIN_RLED and CC2640R2_LAUNCHXL_PIN_GLED， as shown in picture 4.


picture 3


picture 4

(2) Delete GPIOCC26XX_DIO_07 and GPIOCC26XX_DIO_06 in CC2640R2_LAUNCHXL.c , as picture 5 shows.


picture 5

(3) Change the configuration of bootloader backdoor enable controller. Configure SET_CCFG_BL_CONFIG_BL_PIN_NUMBER as DIO23 in ccfg.c , as picture 6 shows .


picture 6

(4) Delete the defined parameters related to DIO23 in CC2640R2_LAUNCHXL.h , as picture 7 and picture 8 shows.


picture 7


picture 8

(5) Delete the defined parameters related to DIO23 in CC2640R2_LAUNCHXL.c , as picture 9 and picture 10 shows.


picture 9


picture 10

(6) Connect DIO6 and DIO7 of the CC2640R2 launchpad with my computer through USB-TTL, as shown in picture 11 . Disconnect the jumper of TXD and RXD  in CC2640R2 LAUNCHPAD , as shown in picture 12.


picture 11


picture 12

(7) Rebuild the simple_peripheral project and flash it into CC2640R2 LAUNCHPAD . Press the reset button in CC2640R2 LAUNCHPAD while DIO23 in the low level . Then pull up the DIO23 after reset completed . At last , flashing the bin file into CC2640R2 LAUNCHPAD through sblAppEx.exe . However , the CMD window shows CC2640R2 LAUNCHPAD is not in bootloader mode , as picture 13 shows . Where am I wrong ?


picture 13

3、The documents related to bootloader
(1)reference manual
www.ti.com/.../swra466a.pdf

(2)sblAppEx.exe can be downloaded here
www.ti.com/.../getliterature.tsp

4、Attachments
(1) the location of simple_peripheral  in my computer
C:\ti\simplelink_cc2640r2_sdk_1_40_00_45\examples\rtos\CC2640R2_LAUNCHXL\blestack\simple_peripheral

(2) hex2bin app can be downloaded here
sourceforge.net/.../

(3) simplelink_cc2640r2_sdk_1_40_00_45 can be downloaded here
dev.ti.com/.../

(4) CC2640R2 launchpad can be bought here
www.ti.com/.../launchxl-cc2640r2

(5) my source code can be downloaded here (including: CC2640R2_LAUNCHXL.h 、 CC2640R2_LAUNCHXL.c 、 ccfg.c)


5、My developing environment
CCS:Code Composer Studio 7.2.0
SDK:simplelink_cc2640r2_sdk_1_40_00_45
hardware:CC26640R2 launchpad develop kit
system：win7 64 bit

  • 0
    TI__Guru** 106705 points
    Hi Heng,

    The ROM bootloader is hard wired to certain DIOs as is documented in the Technical Reference Manual. If you need to interface other DIOs you can consider using a flash implementation of the BL instead. You can find an example here: github.com/.../ble_examples-2.2

    Cheers,
    Fredrik
  • 0 in reply to Fredrik K
    Expert 1020 points

    Thanks for your reply!  Problem has already been solved !

    1、Problem has already been solved

         The reason why the first experiment failed is that DIO2 and DIO3 were not used as UART RXD  and UART TXD.

    2、Detail Analysis

         In 《CC13x0, CC26x0 SimpleLink Wireless MCU Technical Reference Manual》, it has been obviously declared that only DIO2 and DIO3 can be used as UART RXD  and UART TXD ,  reconfiguring is not allowed , as shown in picture 1 .

    picture 1

    3、Verification

        Adding another two experiments , NO.3 and NO.4 .  Configuration of two experiments is shown in picture 2 . Taken for granted ，  these two experiments are sucess .