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by iwbnwif
Wed Jan 17, 2018 3:04 pm
Forum: Compute Module
Topic: Please help to Remap pin Uart 0
Replies: 33
Views: 11067

Re: Please help to Remap pin Uart 0

Thanks and sorry, yes I should have realised this is the CM forum. Actually, my end plan is to use two CM3 but I was experimenting with a pair of RPI3 first. All is not lost though because the display has a micro-USB power input, so I can power it that way and leave the GPIO connect completely free....
by iwbnwif
Wed Jan 17, 2018 2:45 pm
Forum: Compute Module
Topic: Please help to Remap pin Uart 0
Replies: 33
Views: 11067

Re: Please help to Remap pin Uart 0

Unfortunately your scheme won't work. There is only one set of pins brought out onto the 40-pin header that can carry the UART signals - GPIOs 14-17 (TXD, RXD, CTS & RTS). These signals can be from UART0 (ttyAMA0) or UART1 (ttyS0), but not both. You need to read page 102 of the BCM2835 ARM Peripher...
by iwbnwif
Wed Jan 17, 2018 1:05 pm
Forum: Compute Module
Topic: Please help to Remap pin Uart 0
Replies: 33
Views: 11067

Re: Please help to Remap pin Uart 0

Firstly, I am rather new to RPI and very new to the device tree / overlays, so please bare with me! I have a WaveShare display (https://www.waveshare.com/wiki/3.5inch_HDMI_LCD) which occupies physical pins 1-26 of the GPIO connector, even though it hardly uses any of them. I am not even using the to...
by iwbnwif
Thu Jan 04, 2018 12:49 am
Forum: General discussion
Topic: Pi to Pi communication with I2C and pigpio
Replies: 5
Views: 1125

Re: Pi to Pi communication with I2C and pigpio

Thanks for the tips. 2. Use a UART, connect TX to RX, RX to TX and you can easily communicate over that. You can even get TCP/IP running over PPP over a serial connection. Yes, I think that is the way to go. I did look into PPP for this (that bought back memories from years back!). It would be quite...
by iwbnwif
Wed Jan 03, 2018 8:39 pm
Forum: General discussion
Topic: Pi to Pi communication with I2C and pigpio
Replies: 5
Views: 1125

Re: Pi to Pi communication with I2C and pigpio

Thank you very much for your help. The reasons why am looking for a 'bus' solution are to have some level of expansion capability and to automatically handle the asynchronous nature of the incoming messages. Using a standard such as I2C or CANbus would allow me to sniff the bus with off-the-shelf to...
by iwbnwif
Wed Jan 03, 2018 3:50 pm
Forum: General discussion
Topic: Web server for RasPi 3?
Replies: 23
Views: 4320

Re: Web server for RasPi 3?

It might be worth taking a look at https://github.com/civetweb/civetweb. I didn't use it recently, but before it was very lightweight and can be cross-compiled for ARM, but probably easier just to build it on your Pi. Note: Seems to be okay, see here: https://www.raspberrypi.org/forums/viewtopic.php...
by iwbnwif
Wed Jan 03, 2018 3:36 pm
Forum: General discussion
Topic: Pi to Pi communication with I2C and pigpio
Replies: 5
Views: 1125

Pi to Pi communication with I2C and pigpio

Hi, I am new to the Raspberry Pi, so apologies for any gaps, misunderstandings or incorrect terminology. I would like to connect a few (~4) Pi's together as part of an experiment. 3 of the Pi's will be connected to LORA modules and receive different serial data from various remote sensors. Each Pi w...

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