Flash with bootloader uart issue stm32f405

[SBaro.11]

Hi,

I'm trying to flash overt build in uart bootlader stm32 slave device. Here is my setup :
Master STM32F4 with tinyUSB

Slave STM32WLE5 device

Master and slave are connected together over uart. Master has control of boot0 and reset ligne of slave device.

Master UART2 PD5/PD6

Slave UART2 PA2/PA3

I'm able to put slave device into bootloader mode, but when I'm trying to connect with stm32cubeprogrammer over my usb I got NACK command from getId command

Here is the output of verbose mode cube programmer:

12:43:06:195 : UR connection mode is defined with the HWrst reset mode
  12:43:06:257 : RTS low
  12:43:06:257 : DTR low
  12:43:06:277 : Serial Port cu.usbmodem123 is successfully opened.
  12:43:06:277 : Port configuration: parity = even, baudrate = 115200, data-bit = 8,                     stop-bit = 1.0, flow-control = off
  12:43:06:277 : No Init bits value is : 0 
  12:43:06:277 : Sending init command: 
  12:43:06:277 : byte 0x7F sent successfully to target
  12:43:06:277 : Wait ends after 1 loop, dataready = 1, delay = 5
  12:43:06:277 : Received response from target: 0x79
  12:43:06:277 : Activating device: OK
  12:43:06:277 : Board       : --
  12:43:06:277 : Sending GetID command and its XOR:
  12:43:06:278 : byte 0x02 sent successfully to target
  12:43:06:278 : byte 0xFD sent successfully to target
  12:43:06:278 : Wait ends after 1 loop, dataready = 1, delay = 6
  12:43:06:278 : Received response from target: 0x1f
  12:43:06:278 : Response received from device: NACK
  12:43:06:278 : Error: GETID command not acknowledged!
  12:43:06:278 : Reemission of GetID command
  12:43:06:278 : Sending GetID command and its XOR:
  12:43:06:278 : byte 0x02 sent successfully to target
  12:43:06:278 : byte 0xFD sent successfully to target
  12:43:06:278 : Wait ends after 1 loop, dataready = 1, delay = 7
  12:43:06:278 : Received response from target: 0x1f
  12:43:06:278 : Response received from device: NACK
  12:43:06:278 : Error: GETID command not acknowledged!
  12:43:06:278 : Reemission of GetID command
  12:43:06:278 : Sending GetID command and its XOR:
  12:43:06:278 : byte 0x02 sent successfully to target
  12:43:06:278 : byte 0xFD sent successfully to target
  12:43:06:278 : Wait ends after 1 loop, dataready = 1, delay = 6
  12:43:06:278 : Received response from target: 0x1f
  12:43:06:278 : Response received from device: NACK
  12:43:06:278 : Error: GETID command not acknowledged!
  12:43:06:278 : Chip ID: 0x0 
  12:43:06:278 :  UART PORT CLOSE 

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Sometimes I'm able to get bootloader version and chip id and sometime not. My problem look realy similar to this post 

If I try to use even parity my slave device never respond to 0x7F

EDIT: sometimes I can get chip id

15:45:23:537 : Port configuration: parity = even, baudrate = 115200, data-bit = 8,                     stop-bit = 1.0, flow-control = off
  15:45:23:537 : No Init bits value is : 0 
  15:45:23:538 : Sending init command: 
  15:45:23:538 : byte 0x7F sent successfully to target
  15:45:23:538 : Wait ends after 1 loop, dataready = 1, delay = 5
  15:45:23:538 : Received response from target: 0x79
  15:45:23:538 : Activating device: OK
  15:45:23:538 : Board       : --
  15:45:23:538 : Sending GetID command and its XOR:
  15:45:23:538 : byte 0x02 sent successfully to target
  15:45:23:538 : byte 0xFD sent successfully to target
  15:45:23:538 : Wait ends after 1 loop, dataready = 1, delay = 7
  15:45:23:538 : Received response from target: 0x1f
  15:45:23:538 : Response received from device: NACK
  15:45:23:538 : Error: GETID command not acknowledged!
  15:45:23:538 : Reemission of GetID command
  15:45:23:538 : Sending GetID command and its XOR:
  15:45:23:538 : byte 0x02 sent successfully to target
  15:45:23:538 : byte 0xFD sent successfully to target
  15:45:23:538 : Wait ends after 1 loop, dataready = 1, delay = 6
  15:45:23:538 : Received response from target: 0x79
  15:45:23:538 : Received 4 data bytes from target : 0x01049779
  15:45:23:538 : Chip ID: 0x497 
  15:45:23:538 : Sending Get command and its XOR:
  15:45:23:538 : byte 0x00 sent successfully to target
  15:45:23:539 : byte 0xFF sent successfully to target
  15:45:23:539 : Wait ends after 1 loop, dataready = 0, delay = 1001
  15:45:23:539 : Timeout error occured while waiting for acknowledgement.
  15:45:23:539 : No response from target received
  15:45:23:539 : Error: GET command not acknowledged!
  15:45:23:539 : Reemission of Get command
  15:45:23:539 : Sending Get command and its XOR:
  15:45:23:539 : byte 0x00 sent successfully to target
  15:45:23:539 : byte 0xFF sent successfully to target
  15:45:23:539 : Wait ends after 1 loop, dataready = 1, delay = 5
  15:45:23:539 : Received response from target: 0x1f
  15:45:23:539 : Response received from device: NACK
  15:45:23:539 : Error: GET command not acknowledged!
  15:45:23:539 : Reemission of Get command
  15:45:23:539 : Sending Get command and its XOR:
  15:45:23:539 : byte 0x00 sent successfully to target
  15:45:23:539 : byte 0xFF sent successfully to target
  15:45:23:539 : Wait ends after 1 loop, dataready = 1, delay = 6
  15:45:23:539 : Received response from target: 0x1f
  15:45:23:539 : Response received from device: NACK
  15:45:23:539 : Error: GET command not acknowledged!
  15:45:23:539 :  UART PORT CLOSE 

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 If I try to send command directly from serial terminal (coolterm for example) I have the same problem, first I send 0x7F my stm32wl5 respond 0x79

after send: 0x02, 0xFD, I only receive 0x79, 0x01, and sometime I receive all message.... Do we have to respect a precise timing between sending packets? bytes? I have try to send byte by byte same problem

Here is a small python script I used to test

import serial
import time

ser = serial.Serial('myCOM', baudrate=115200, timeout=1)  


ser.write(b'\x7F')
ack = ser.read()
print(f"ACK 0x7F: {ack.hex()}") 

time.sleep(0.5)

ser.write(b'\x02')
time.sleep(0.5)
ser.write(b'\xFD')


resp = ser.read(5) 
print("Get ID:", resp.hex())

 First command always works, but for example second command 0x02,0xFD, if I send 2 bytes together I always got a NACK 0x1F ser.write(b'\x02\xFD'). //always NACK

But If I add a small sleep and send byte by byte 0x02 first and after sleep (0.5s like in my above script) 0xFD I got 0x79,0x01,0x79, why??

EDIT: it's look like as soon as I init my UART2 on my master stm32f4 device, I'm not able to connect with uart and stm32cubeprogrammer to my slave stm32. I've try to set parity NONE, EVEN, no change. It's only working if I don't init my UART2 on my master stm...

[Saket_Om]

Hello @SBaro.11 

---

@SBaro.11 wrote:

Hi,

I'm trying to flash overt build in uart bootlader stm32 slave device. Here is my setup :
Master STM32F4 with tinyUSB

Slave STM32WLE5 device

Master and slave are connected together over uart. Master has control of boot0 and reset ligne of slave device.

Master UART2 PD5/PD6

Slave UART2 PA2/PA3

I'm able to put slave device into bootloader mode, but when I'm trying to connect with stm32cubeprogrammer over my usb I got NACK command from getId command

---

Could you explain your setup configuration with more details please? 

[Karl Yamashita]

My initial impression is that you are trying to use the master to update the slave using UART.

But then you mention stm32cubeprogrammer. So now it's unclear what you're trying to achieve with the master and stm32cubeprogrammer to update the slave?

Are you using the stm32cubeprogrammer to update the slave FW over UART using the DFU?

If so, what HW interface are you using and if that is connected to the same UART as the master?