Configure Serial connection¶
First of all I’ve made a Sender object to communicate with Serial:
# Creating Sender object try: sender = E3Sender.E3Sender("/dev/ttyS0", 9600) except Exception as e: flash(e) return render_template('engraveForm.html', title='Engrave', form=form)
I also noticed sometimes UART is disabled in kernel. The enable it you need to check in /boot/config.txt the line enable_uart
If it’s set to 0 like follow
enable_uart=0
You need to change to 1 as follow
enable_uart=1
In alternative you can use raspi-config and enable UART but disabling the console, as follows:
Now you can find the ttyS0 port in /dev
pi@engravecube:/ $ ls /dev autofs loop7 ram6 tty20 tty46 urandom block loop-control ram7 tty21 tty47 vchiq btrfs-control mapper ram8 tty22 tty48 vcio bus mem ram9 tty23 tty49 vc-mem cachefiles memory_bandwidth random tty24 tty5 vcs char mmcblk0 raw tty25 tty50 vcs1 console mmcblk0p1 rfkill tty26 tty51 vcs2 cpu_dma_latency mmcblk0p2 serial0 tty27 tty52 vcs3 cuse mqueue serial1 tty28 tty53 vcs4 disk net shm tty29 tty54 vcs5 fb0 network_latency snd tty3 tty55 vcs6 fd network_throughput stderr tty30 tty56 vcsa full null stdin tty31 tty57 vcsa1 fuse ppp stdout tty32 tty58 vcsa2 gpiochip0 ptmx tty tty33 tty59 vcsa3 gpiomem pts tty0 tty34 tty6 vcsa4 hwrng ram0 tty1 tty35 tty60 vcsa5 initctl ram1 tty10 tty36 tty61 vcsa6 input ram10 tty11 tty37 tty62 vcsm kmsg ram11 tty12 tty38 tty63 vhci log ram12 tty13 tty39 tty7 watchdog loop0 ram13 tty14 tty4 tty8 watchdog0 loop1 ram14 tty15 tty40 tty9 zero loop2 ram15 tty16 tty41 ttyAMA0 loop3 ram2 tty17 tty42 ttyprintk loop4 ram3 tty18 tty43 ttyS0 loop5 ram4 tty19 tty44 uhid loop6 ram5 tty2 tty45 uinput pi@engravecube:/ $