We are using STM32H743 Controller in one of our LRU (Line replaceable unit).
Since February end, The LRU System Test equipment cannot load the programming (.bin ) file to many units. This is the first time this specific failure mode has appeared. This is also the first time that any kind of OPS programming failure has appeared that isn't an operator or facility issue.
We have tried loading the .bin file using STM32Cube programmer as well but still the issue exists.
We have recently come across this PCN where Bootloader version of 9.1 is Changed to V9.2 resolving abnormal data output on the USART1_TX PB14.
- We are using USART3_TX on PB14 and USART3_RX on PB11. Do you think OPC bootloader V9.1 to V9.2 has any impact on USART 3 interface used for RS-232 ?
Note , once we replace the STM32 IC with the old batch code , this issue is resolved.
More details :Here are our connections.
USART1_TX : PB14 (PULL DOWN 100K), series resistor 47 ohms.
USART1_RX :PB15 (PULL DOWN 100K ) series resistor 22 ohms .
USART1 connections are currently not used but has the above connections available in the design. Do you suggest removing the pull-down resistor of 100K when USART1 is not used?
We are using USART3 for programming using serial port.
Connections:USART3_RX : on PB11 and USART3_TX on PB10 .
None of them have a pull up currently. Used RS232 driver MAX3232MPW. Do you suggest the pull up resistors on these Tx and Rx lines?
Can we get the bootloader code for 9.1 and 9.2?
Is anyone else has faced similar issues in the past ?
Request you to please provide some support as this is our production issue and needs to be resolved immediately.
