TWI Module lock-up still present in nrf51822 v3 [PAN #56]

[Mike]

Hi,

I am currently experiencing TWI module lock-up issues with the hardware TWI library, which is supposedly fixed according to PAN v3.0, issue #56. (The issue was previously identified in PAN v2.3)

My setup is as follows, custom board, SD110v8, NRF51822 QFAAH0 (16kB flash, v3 silicon). My code is modified from the dfu_ble_dual_bank example in the Keil packs. The TWI transaction is triggered every 2s by the app_timer.

If I change the TWI library to software TWI, then the problem disappears.

An interesting note is, before the dfu bootloader starts (prior to the function call of : bootloader_dfu_start ), the module lock up doesnt seem to happen. Once the bootloader fully starts, (after calling bootloader_dfu_start function), the TWI transaction would randomly occur, fairly frequently.

Could someone from Nordic provide some insight to this problem? As my observations seem to contradict the PAN v3.0

Warm regards, Mike

[MartinBL]

Hi. Which TWI driver are you using. I'm afraid that there are a couple of different versions out there. I have attached the TWI hardware driver included in SDK v8 which is supposed to have corrected for PAN 56.

twi_hw_master.c

[RK]

I don't think that was his question, he didn't want a TWI driver which worked around PAN 56, he was saying that the latest revision 3 chipset was supposed to have fixed PAN 56 in hardware, thus not requiring a driver which worked around the issue because there should no-longer be an issue to work around.

Does revision 3 hardware still suffer from TWI lockup? The original poster is saying that he's seeing something very like the pre-revision 3 TWI hardware lockup on revision 3 hardware.