Hello Valentin, I used the wiringPi library to put the pins into the alternative mode.
Regards, Andreas > 4 jun 2015 kl. 15:31 skrev Valentin Le bescond <valentin.lebesc...@gmail.com>: > > Hi ! > > I'm really no expert but am very interested in the subject. > > Did you modify the device tree ? From what I understand in the DT that you'll > find pinmux definition right ? > > Regards. > > > 2015-06-04 14:01 GMT+02:00 Andreas Enbacka <andreas.enba...@gasera.fi>: >> Hello, >> >> >> >> After a long break, I have returned to the Yocto project, and generally very >> pleased. A lot of progress has been done since I last used the project (two >> years ago), and now in my opinion everything works very smoothly. >> >> >> >> I have used yocto to build a custom image for the RaspberryPi Compute >> Module. Generally everything works ok, however I am experiencing problem >> with accessing the UART1 port on the raspberryPi. I am using a library >> called wiringPi to put the appropriate GPIO pins in the correct mode (alt5) >> for RXD1/TXD1 (pins 32/33). Also I have used menuconfig to enable the >> 8250/16550 serial port support in the kernel (3.18.5+). After booting the >> image I examined the dmesg output, and it shows following information >> related to 8250/16550: >> >> .. >> >> [ 1.010958] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled >> >> [ 1.013920] serial8250.0: ttyS0 at MMIO 0x20215040 (irq = 29, base_baud = >> 7812500) is a 8250 >> >> … >> >> >> >> Then I put the pins 32/33 into alternative mode alt5, and try to connect to >> the port /dev/ttyS0 using minicom (baud 115200). Trying to enter something >> into the Mincom terminal does not give any indications on our connected >> oscilloscope (connected to the relevant pins), however change of the alt >> mode earlier was observed correctly. The serial port should not be using any >> flow control, but when trying to disable the flow control using Minicom (it >> was on by default) freezes the complete RaspberryPi system (requiring to >> disconnect and reconnect power). >> >> >> >> Does anyone have any thoughts what could be the cause of these issues (e.g., >> problems with driver etc)? Any information would be greatly appreciated. In >> the project we are working on we would need to use both uart ports (0/1) >> provided by the compute module (the uart0 is a pl011 and by disabling >> console use of /dev/ttyAMA0 we were able to successfully connect to that >> port). >> >> >> >> Thanks for the great work with the Yocto platform. >> >> >> >> Sincerely, >> >> Andreas Enbacka >> >> SW designer >> >> Gasera Ltd >> >> >> >> >> -- >> _______________________________________________ >> yocto mailing list >> yocto@yoctoproject.org >> https://lists.yoctoproject.org/listinfo/yocto >
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