Hi,
I’m trying to implement OTA using the example software and hardware below. But it seems very unreliable.
- STM32Cube_FW_WB_V1.7.0\Projects\P-NUCLEO-WB55.Nucleo\Applications\BLE
- BLE_Ota
- BLE_p2pServer_ota
- Compiled with IAR for ARM 8.50
- STM32CubeProgrammer API v2.4.0
- STM32CubeMonitor-RF Version 2.5.0
- STM32WB55 Nucleo Pack
I programmed BLE_Ota.out and BLE_p2pServer_ota.out into the P-NUCLEO-WB55 using the STM32CubeProgrammer and verified the green LED is flashing indicating RF messages.
I then used the STM32CubeMonitor-RF with the USB dongle and Nucleo board about 5 cm apart.
And then I tried to perform an OTA update. I found mostly it worked, but sometimes it failed. When it failed, the flash memory at 0x08007000 was all FFs (which is where the new application should be located). I added a break point to BLE_Ota and verified this was due to an invalid magic number (0x94448A29).
When you create a build the address of the last word in your image is stored at offset 140 in your file. The last word should contain the magic value 0x94448A29 for the BLE_OTA to assume the OTA worked correctly.
But when it failed I noticed the magic number was actually located early on in memory. It seems a BLE packet is lost somewhere so the magic number isn’t placed at the correct location.
Since my code is a bit bigger I added some padding to simulated my larger file
Main.c
/* USER CODE BEGIN PTD */
#define p16 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16
#define p256 p16,p16,p16,p16,p16,p16,p16,p16,p16,p16,p16,p16,p16,p16,p16,p16
#define p4k p256,p256,p256,p256,p256,p256,p256,p256,p256,p256,p256,p256,p256,p256,p256,p256
#define p64k p4k,p4k,p4k,p4k,p4k,p4k,p4k,p4k,p4k,p4k,p4k,p4k,p4k,p4k,p4k,p4k
const uint8_t padding[] = {p64k,p64k};
uint8_t const * paddingPtr;
/* USER CODE END PTD */
:
/* USER CODE BEGIN 1 */
paddingPtr= &padding[sizeof(padding)-1];
/* USER CODE END 1 */
With this new larger file I can never get the OTA to work. So it looks likes the OTA is too unreliable to work successfully... or am I doing something wrong?
Thank you for your help
Chris
