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Author Topic: FT260 GPIO initial output state  (Read 676 times)

rdb9878

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FT260 GPIO initial output state
« on: August 20, 2021, 10:57:32 AM »

Hello. I'm trying to utilize the GPIO features of the FT260. One thing I have noticed is that when I configure the GPIO as outputs, it seems to be completely random whether or not they initially output as a '1' or a '0'. This makes it very hard to ensure proper GPIO sequencing.

Here are the things I have tried to combat this: 1) I've tried calling FT260_GPIO_Write before calling FT260_GPIO_SetDir, but the status field returns FT260_GPIO_WRONG_DIRECTION, and it simply doesn't have an effect. 2) I've tried calling FT260_GPIO_Set before calling FT260_GPIO_SetDir, and I get the FT260_OK status, but the values don't seem to "stick" until I have already enabled the outputs...

Any suggestions on how to ensure a specific initial output state?

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Re: FT260 GPIO initial output state
« Reply #1 on: August 20, 2021, 01:07:08 PM »

hi,

have a look at https://ftdichip.com/wp-content/uploads/2020/08/AN_184-FTDI-Device-Input-Output-Pin-States.pdf. This application note goes over the I/O pin states of our devices, section 22 is for the FT260.

we also have a couple of software examples for the FT260 that may be able to help you. The folder for the code examples can be found here: https://ftdichip.com/products/ft260q/ under the downloads tab, you should have a look at the GPIO and GPIO_OpenDrain examples.

Please let me know if you have any more questions

Thanks

Kieran 

 
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