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Showing results for '"uart rts"'.
Found 5 results
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Is it possible to use uart rts gpio on mainline? May be like discribed here https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next/+/refs/heads/akpm-base/Documentation/devicetree/bindings/serial/serial.txt
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Hi all, I'm trying to use an Orange Pi PC Plus to drive an RS485 serial converter and ultimately talk Modbus to a sensor device. I have managed to get flow control enabled on the port, but the polarity of the RTS signal is active LOW, whereas the converter I have requires active HIGH. Is there any way to invert the polarity of the RTS pin for the UART? I think it can be done via ioctl call in C programs, but I need this applied at a system level to be compatible with some third party software. Thanks in advance!
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Equation for board with SDIO wlan and bluetooth, no gmac: the SDIO module is wired with a full uart RTS CTS (UART0 | UART1) for Bluetooth and a sdmmc (SDMMC0 | SDMMC1 | SDMMC0_EXT). UART1 is multiplexed with SDMMC0_EXT. UART2 has a pin switch (UART2-0 | UART2-1). UART2-1 isn't multiplexed with SDMMC0. SDMMC0 available. UART2-0 is multiplexed with SDMMC0. SPI2 is multiplexed with SDMMC0_EXT. I see four possibilities : - The console is UART2-0 (multiplexed with SDMMC0). SDMMC0_EXT and SDMMC1 are dedicated to the SDIO module. Boot possible with an SDMMC0 sdcard but loss of the UART2 console. => (maybe an idea about bug boot with uart connected) - The console is UART2-1 (not multiplexed with SDMMC0). UART1 (disable SDMMC0_EXT) for serial bluetooth, SDMMC1 and SDMMC0 are dedicated to the SDIO module and SD socket. Boot possible with an SDMMC0 sdcard. - The console is UART2-1 (not multiplexed with SDMMC0). UART0 for serial bluetooth, SDMMC1, SDMMC0 and SDMMC0_EXT can be dedicated to the SDIO module and SD socket. Boot possible with an sdcard if SDMMC0 is available on sd socket. Boot possible with an spi nor flash if SDMMC0_EXT is available on sd socket. - The console is UART1 (multiplexed with SDMMC0_EXT). UART0 for Bluetooth, SDMMC1|SDMMC0 for sdio wlan. SDMMC1|SDMMC0 for sd socket. Boot possible with an SDMMC0. - The console is UART0. UART1 (multiplexed with SDMMC0_EXT) for Bluetooth, SDMMC1|SDMMC0 for sdio wlan and SD port. SDMMC1|SDMMC0 for sd socket. Boot possible with an SDMMC0. As information ROCK64 use UART2-1 for serial console. Sorry for brainstorming but it's needed to make the right uboot with output on right serial console
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Equation for Z28 PRO with SDIO wlan bluetooth (FN6222B), gmac : the SDIO module is wired with a full uart RTS CTS (UART0 | UART1) for Bluetooth and a sdmmc (SDMMC0 | SDMMC1 | SDMMC_EXT). UART0, SDMMC1 unavailable because multiplexed with GMAC UART1 is multiplexed with SDMMC_EXT. UART2 has a pin switch (UART2-0 | UART2-1). UART2-1 isn't multiplexed with SDMMC0. SDMMC0 available. UART2-0 is multiplexed with SDMMC0. SPI2 is multiplexed with SDMMC_EXT. I see only one possibilitie : UART2-1 is serial console, let available SDMMC0. UART1 is for bluetooth link => SDMMC0_EXT unavailable. As SDMMC1 is unavailable because multiplexed with GMAC, SDMMC0 is for sdio wlan. Next big question is how is wired sdsocket? is it spi wired?
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https://forum.armbian.com/index.php?/search/&q=uart rts
