Re: how to configure UART4 with RTSCTS mode on iMX6 ?
Specifically, when I probe (with an Oscilloscope) the CTS and RTS lines (with respect to iMX6), I can see CTS line toggling - indicating that my bluetooth module wants to talk to the iMX6. But the RTS line just stays high. Which means that from my bluetooth module's point-of-view, the iMX6 is not ready to receive any data. Does anyone know how I could fix this?
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RTS-GPIO not working with imx tty driver · Issue...
I can NOT use hardware RTS because the Advantech RSB-3430 does not have those signals exposed on the 40-pin connectors (CN1 and CN2). I'm doing manual gpio sets for RTS from user space (using gpiod) but it is not reliable, especially under processor load. The timing is not reliable and clobbers responses from other devices on the RS485 bus. The imx tty driver does support the rts-gpio devicetree setting.
Enable UART cts-gpios and rts-gpios on Verdin iMX8MM
I managed to configure Verdins GPIO_3 and GPIO_4 and use them as RX and TX. There is no other UART3_CTS and UART3_RTS pin available I had to recompile imx8mm-verdin-wifi-dev.dts to disable fsl,uart-has-rtscts property. But i still havent successfully enabled GPIO_6 and GPIO_7 for flow control.
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i.MX RT1062: Getting Started, on a Raspberry Pi? Forum
IMX RT is really great but too much pins are lost on power related stuff, and I dislike special power on / off sequence.
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Linux v6.6.1 - drivers/tty/serial/imx.c
A way to reproduce the flood (checked on iMX6SX) is: open iMX UART at 9600 * 8N1, and from external source send 0xf0 char at 115200 8N1.
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