Galileo is a microcontroller board based on the Intel(R) Quark(TM) SoC X1000 Application Processor, a 32-bit Intel Pentium-class system on a chip.
The Gen 2 board has the following limitations in libmraa:
intel_qrk_plat_galileo_gen2.gpio_cs=1
on the kernel line in the boot config on the galileo, this can be found at /media/mmcblk0p1/boot/grub/grub.conf
Uart 1 is connected to the FTDI header and the linux console. It's also possible to use it from A2(Rx)/A3(Tx). However mraa does not support this directly so you need to enable the muxing manually. Here is an example of how this is done, this was tested using an FTDI 3.3V TTL cable:
$ systemctl stop serial-getty@ttyS1.service $ python >>> # Configure the Muxes for Uart1 on Aio2/3 >>> import mraa as m >>> p77 = m.Gpio(77, False, True) >>> p76 = m.Gpio(76, False, True) >>> p16 = m.Gpio(16, False, True) >>> p17 = m.Gpio(17, False, True) >>> p77.write(1) >>> p76.write(1) >>> p16.dir(m.DIR_OUT) >>> p16.write(0) >>> p17.dir(m.DIR_OUT) >>> p17.write(1) >>> # For Rx to work correctly switch the level shifter >>> p34 = m.Gpio(34, False, True) >>> p34.dir(m.DIR_OUT) >>> p34.write(1) >>> # Use the uart >>> x = m.Uart(1) >>> x.setBaudRate(115200) >>> x.writeStr('hello') >>> x.read(5) bytearray(b'dsds\n')