Hello,
Has anyone tried to bring up a SIM7100E based hat on Orange PI Zero over the UART GPIO interface? I have enabled the UART ports in armbianEnv.txt as follows:
overlay_prefix=sun8i-h3
overlays=usbhost2 usbhost3 uart1 uart2
dmesg | grep tty shows :
[ 0.000379] console [tty1] enabled
[ 1.765329] console [ttyS0] disabled
[ 1.785581] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 39, base_baud = 1500000) is a U6_16550A
[ 1.785700] console [ttyS0] enabled
[ 1.810679] 1c28400.serial: ttyS1 at MMIO 0x1c28400 (irq = 40, base_baud = 1500000) is a U6_16550A
[ 1.835564] 1c28800.serial: ttyS2 at MMIO 0x1c28800 (irq = 41, base_baud = 1500000) is a U6_16550A
I have connected the TX/RX pins as in the picture : http://linux-sunxi.org/File:OPi_Zero_UART.jpg to corresponding RX/TX ports on the SIM7100E module. The SIM7100E module I am using is : https://www.aliexpress.com/item/EU-Network-SIM7100E-4G-Module-Development-Board-Antenna-for-Arduino-Raspberry-Pi-Android-Linux-Windows/32864790020.html
The module works fine on a standard linux Desktop running Ubuntu and am now trying to bring it up on Orange Pi Zero.
Any help is much appreciated.
Thank You.
