Wiki source code of Check List for UART access issue -- STM32
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| author | version | line-number | content |
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1.3 | 1 | = 1. Introduction = |
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1.1 | 2 | |
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1.3 | 3 | This chapter describe the checklist for not able to access to AT Command in Dragino LoRaWAN End Node base on STM32 chip. |
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1.1 | 4 | |
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1.3 | 5 | = 2. Not able to send AT Command = |
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1.1 | 6 | |
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1.3 | 7 | * Do you use a USB to TTL Converter? If you use RS232 converter, it won't work |
| 8 | * Can you see the output from console. | ||
| 9 | * Do you use the correct baudrate: | ||
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1.1 | 10 | |
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1.4 | 11 | (% class="box" %) |
| 12 | ((( | ||
| 13 | ~** Baudrate: 9600 | ||
| 14 | ~** Data bits: 8 | ||
| 15 | ~** Stop bits: 1 | ||
| 16 | ~** Parity: None | ||
| 17 | ~** Flow control: None | ||
| 18 | ))) | ||
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1.1 | 19 | |
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1.3 | 20 | * Did you have the hardware RXD pin connected correctly according to the user manual? |
| 21 | * 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: | ||
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1.1 | 22 | |
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1.3 | 23 | [[image:https://wiki.dragino.com/images/thumb/5/5c/UART_access_1.png/600px-UART_access_1.png||height="419" width="600"]] |
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1.1 | 24 | |
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1.3 | 25 | Add a new line in some software |
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1.3 | 28 | = 3. If you still not able to fix this issue = |
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1.1 | 29 | |
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1.3 | 30 | please send us below info at support@dragino.com |
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1.1 | 31 | |
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1.3 | 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. |