Additional UART, I2C or SPI at HC1/HC2

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gdymek
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Additional UART, I2C or SPI at HC1/HC2

Post by gdymek »

Hi,

I am planning to build a farm of devices using odroid HC1/HC2. It would be good idea if each device has a simple display which shows id and status of device. The simplest solution would be use UART or I2C to connect a simple display. There are 3 options:
1. connect display to existing UART at board, but I do not know what is logged at this port, hence I would have to make "intelligent display" which filters out noise and reacts only for display commands
2. use USB and USB/uart converter, but it is requires additional patch cords, takes more space and is more error prone
3. use existing UART/I2C bus at EXYNOS5422, which is not currently used
When I was studying odroid HC1/2 schematic (https://dn.odroid.com/5422/ODROID-HC1_M ... 171017.pdf) I can see that UART_0, UART_1, UART_3, I2C_0, I2C_1, I2C_2, I2C_5, I2C_8, SPI_1 are not used. Are there any test points or places at top/bottom layer where I can solder wires to UART/I2C/SPI display?

Thanks in advance

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Re: Additional UART, I2C or SPI at HC1/HC2

Post by odroid »

There is no exposed test points for the IO signals.

But you can use the the console UART port for other purposes.
https://wiki.odroid.com/odroid-xu4/trou ... le_console
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gdymek (Wed Jul 15, 2020 9:08 pm)

gdymek
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Re: Additional UART, I2C or SPI at HC1/HC2

Post by gdymek »

Thank you for fast replay.
But anyway if you are planning new versions of HC1/HC2, maybe it is worth to consider adding some test points at top layer, (bottom layer has difficult access due to heatsink ) or new connector for generic communication such as UART.

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