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Forum Index : Microcontroller and PC projects : Serial comms on picomite
| Author | Message | ||||
| Gbbickerton Newbie  Joined: 22/06/2022 Location: United KingdomPosts: 11 |
I cannot get serial comms to work on the picomite, the picomite is set up on a pico res touch from waveshare, I am sending serial data from a small picaxe board that sends text at 1200 baud this is working because I can receive the text via a ttl to usb converter on the MM edit terminal, I am using this code. Currently the picomite is in a breadboard for trouble shooting. do SETPIN GP5, GP4, COM2 ' OPEN "COM2:1200" AS #5 ' dat$ = INPUT$(1, #5) ' print "data" print dat$ print loc(#5) CLOSE #5 ' close the serial port pause 100 loop loc(#5) returns 0, so no data in the buffer. |
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| Volhout Guru  Joined: 05/03/2018 Location: NetherlandsPosts: 4226 |
Hi Gbbickterton,' When you open a serial port, it starts with a clean RX and TX buffer. You program Do opens the serial port Then it checks for data Then closes it Then waits 100ms loop There is very little chance a valid character is received in the microseconds. I think your program should open the port. Do check content of buffers pause Loop close the port Volhout Edited 2024-02-03 01:07 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Gbbickerton Newbie Joined: 22/06/2022 Location: United KingdomPosts: 11 |
That sorted it, thank you |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3150 |
Welcome to the forum. MMBasic has excellent serial communications handling. Depending on circumstances, you'd probably do best with something like this (untested): SETPIN GP5, GP4, COM2 ' OPEN "COM2:1200" AS #5 ' do Do 'HERE you want to put any code which is needed between receipt of characters, e.g., if dat$ <> "" then ' your code dat$="" endif Loop While Loc(#1)=0 Pause 100 ' let characters arrive on COM1 (approx 10 per 100ms--increase as needed) dat$ = INPUT$(255, #5) 'get up to 255 characters loop PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3800 |
The LOC(#1) should be LOC(#5), didn't spot anything else - but untested. John |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3150 |
Thanks--cut and paste error (plus lack of proofreading). PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
The COM port buffers are a thing of beauty, and I use them often as a fully automatic message queue, which can receive messages in the background, and your code just has to check the buffer as part of the main loop, and act if there is anything there to process. They are BEAUTIFUL to have. Smoke makes things work. When the smoke gets out, it stops! |
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| Gbbickerton Newbie Joined: 22/06/2022 Location: United KingdomPosts: 11 |
Thanks for the help, my project is a DIY turbo trainer it uses a home made axial flux generator driving 2 mini moto electric motor bike motors with fans. A picaxe reads the current and voltage and sends the data via 433mhz units to a picomite with waveshare display. The data is in the form of UUUUUUUUUUYSM preamble these letters have equal mark space ratio which sets up the bit slicer, when YSM is detected the next 6 bytes are the voltage current and checksum.  |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3150 |
Thanks for the explanation and the photo. Looks like heavy metal (at least for a picaxe). How are you determining the current? "Turbo trainer"--sorry for my ignorance, but trainer for what, if you don't mind? PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| Gbbickerton Newbie Joined: 22/06/2022 Location: United KingdomPosts: 11 |
A turbo trainer is for putting your bike on to provide resistance to pedal against while going nowhere, useful in the winter when its a bit chilly outside. The generator and motors provide a really nice feeling load. The two white blocks are wire wound resistors the voltage across is measured to get the current, the losses are taken into account when calculating the wattage output by the rider. |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3150 |
Ok, thanks. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
Business Op. Have them tied in to the grid. Also have convicts and climate-alarmists pedal them  |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
Surely the next step is to feed an inverter/regulator and charge a battery bank. That powers the mini fridge and a small TV so that after exercise one can slonk on the sofa and watch the match with a cold can or three? :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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