On Mon, Apr 25, 2016 at 10:26 AM, Jean-Sebastien Stoezel < [email protected]> wrote:
> Hi: > > I have a BeagleBone Green running Linux version 4.1.15-ti-rt-r43 and > Debian 8.3 (Jessie). I am cannot seem to send or receive data on UART2. > > What I can see see is that UART2 is enabled: > > *[ 4.368638] 48024000.serial: ttyS2 at MMIO 0x48024000 (irq = 160, > base_baud = 3000000) is a 8250).* > > I have used minicom, a C++ QT application, and an online script ( > http://jsfiddle.net/AjnJs/67/) to try and send data over UART2 but > nothing seems to get to the pins. > > I feel confident in the hardware I use to verify that no data is sent over > the UART2 pins (I have yet to get an oscilloscope out though). > > Looking at the BBG schematic, it seems the UART2 pins are shared with the > SPI. I am wondering if by default SPI might be configured, which might > prevent UART2 from operating. > > Has anybody ever gotten UART2 to work on the BBG? If so, what steps did > you take? > What software check can I perform to verify UART2 is effectively ready to > operate? > Out of the box, we have it setup to utilize universal io, so to enable ths uart pinmux: debian@beaglebone:~$ config-pin -l P9.21 default gpio gpio_pu gpio_pd spi uart i2c pwm debian@beaglebone:~$ config-pin -l P9.22 default gpio gpio_pu gpio_pd spi uart i2c pwm debian@beaglebone:~$ config-pin P9.21 uart debian@beaglebone:~$ config-pin P9.22 uart debian@beaglebone:~$ config-pin -q P9.21 P9_21 Mode: uart debian@beaglebone:~$ config-pin -q P9.22 P9_22 Mode: uart ttyS2 should now be working.. Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYjYz4O5nrSN22VKhRmPmKHW7NueiU6V41UgwjL9WP4%2B9g%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
