Wiki source code of Check List for UART access issue -- STM32
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| author | version | line-number | content |
|---|---|---|---|
| 1 | = 1. Introduction = | ||
| 2 | |||
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| 4 | This chapter describe the checklist for not able to access to AT Command in Dragino LoRaWAN End Node base on STM32 chip. | ||
| 5 | |||
| 6 | |||
| 7 | = 2. Not able to send AT Command = | ||
| 8 | |||
| 9 | |||
| 10 | * Do you use a USB to TTL Converter? If you use RS232 converter, it won't work | ||
| 11 | * Can you see the output from console. | ||
| 12 | * Do you use the correct baudrate: | ||
| 13 | ** (% style="color:blue" %)**Baudrate: 9600** | ||
| 14 | ** (% style="color:blue" %)**Data bits: 8** | ||
| 15 | ** (% style="color:blue" %)**Stop bits: 1** | ||
| 16 | ** (% style="color:blue" %)**Parity: None** | ||
| 17 | ** (% style="color:blue" %)**Flow control: None** | ||
| 18 | |||
| 19 | * Did you have the hardware RXD pin connected correctly according to the user manual? | ||
| 20 | * Did you add the **ENTER** and **NEW LINE** after press send. Some serial utility doesn't add them by default. Below is an example for adding new line: | ||
| 21 | |||
| 22 | [[image:image-20220527083416-1.png]] | ||
| 23 | |||
| 24 | Add a new line in some software | ||
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| 26 | |||
| 27 | = 3. If you still not able to fix this issue = | ||
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| 29 | |||
| 30 | please send us below info at support@dragino.com | ||
| 31 | |||
| 32 | * Screen shot for your serial utility baud rate settings. | ||
| 33 | * Screen shot of your serial console. | ||
| 34 | * A photo shows clearly how you use USB-TTL adapter connect to the device. |