Closed boburshokirov closed 3 months ago
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Hi @boburshokirov,
Sorry for the late reply, it may be true that the GPIO speed may not be able to send data fast enough to a TFT display. Can I check what TFT LCD are you using and is there an SPI interface where you can use instead?
Thank you.
Hi @Kyderio ,
Thanks for the reply. I already tried a couple of other TFT displays with SPI interface. But they are slower than TFT with GPIO. I tried 8-bit parallel writing into the port with other Microcontrollers and it works much faster. I can see micros to write into a port in your library. But I couldn't make it work. If you can provide a simple example of writing into a port, that would be great.
Thanks in advance.
Hi @boburshokirov,
You may refer to the file "wiring_digital.c". There is an API called digitalWrite(uint32_t ulPin, uint32_t ulVal). You may use this API to write into a port. There are many examples in the SDK that uses this API. You may refer to "GPIO->examples->MeasureDistance_HCSR04_Ultrasonic.ino" for reference on how to use this API to write into the port.
Hope this helps.
Thanks.
Hi @Kyderio ,
As I mentioned, I want to write into 8 pins at one time. Above example is for writing into 1 pin. digitalWrite(uint32_t ulPin, uint32_t ulVal) is for writing 1 pin, right? If not, can you please provide an example to write into 8 pins at one time.
Thanks
Hi @boburshokirov,
Unfortunately it is not possible at the moment for GPIO 8 bit parallel write. You may consider I2C interface or SPI interface. There will be a delay for writing 8 bits at once with GPIO interface.
Hope this helps.
Thanks.
closed as no further discussion.
Hardware Environment
AMB82-MINI
Related technical area
GPIO port writing.
Is the feature request related to an un-fixed issue?
No.
Describe the ideal solution/reault/output.
I am trying to connect a TFT display with 8-bit parallel interface. It is working perfectly when I write with digitalWrite(). But the speed is slow. I found a function to write to a GPIO port. But I couldn't make it work. Can you please provide an instructions to use that function?
Additional remarks
No response
I have checked existing/closed list of issues and the Contributing Guide.