Serial Port #629
Replies: 10 comments 34 replies
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The preferred module for serial is in the second one you list -- in $MODDABLE/modules/io. It implements the API from the forthcoming ECMAScript® Embedded Systems API Specification. We intend to move IO in the Moddable SDK over to this API during the course of 2021. The implementation is still early, though it has been reliable on both ESP32 and ESP8266. FWIW - for file transfers to an MCU over serial, the most common problem is buffer overflow on the receiver. This happens when the sender transmits more quickly than the receiver can process the data. A good solution is to implement some form of flow control by having sender wait for periodic acknowledgements from the receiver before transmitting additional data. |
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That looks like it could just be a framing problem - the start bytes are present in the buffer, just not at the start. Perhaps some data arrived on the UART before your code started to read. In that case, the reading code needs to wait for the two message start bytes (0x42 and 0x4D) before filling the buffer. Here's a quick attempt to do that. serial.format = "number";
let index = 0;
while (index < Values.length) {
const byte = serial.read();
if (undefined === byte)
continue;
if ((0 === index) && (0x42 !== byte))
continue;
if ((1 === index) && (0x4D !== byte)) {
index = 0;
if (0x42 !== byte)
continue;
}
Values[index++] = byte;
}
serial.format = "buffer"; |
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Thats great Peter it works very well, many thanks for your help.. |
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Excellent. Separately, I've made a fix for |
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Peter, good to hear that my question unearthed a different problem and that you have made a fix. |
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@rha10, I'll reply briefly here. Further discussion on these points should go into a separate discussion as we are pretty far from the original topic.
Excellent!
Piu is an incredibly powerful tool for rendering interactive UIs on small devices. It does take a bit of effort to learn, especially if you haven't worked with similar frameworks before. The Moddable SDK Piu documentation is very complete and detailed. but is intended more as a reference than a getting started guide. As a tutorial, the Piu chapter our book can't be beat: @lprader did a great job there introducing all the major concepts of Piu with examples.
Yes, we often use both cores of the ESP32 in our client projects. The Moddable SDK provides a subset of the standard Web Workers API. Each worker runs in its own task, and the ESP-IDF schedules those across both cores. Check out our worker documentation for details and a link to an example. |
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Thank you |
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Iin the manifest "$ (MODDABLE) /modules/io/manifest.json" give me an error. This is because my "io" directory is outdated. |
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cd to the MODDABLE folder. then you should re-build all the tools... |
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The answer from @wilberforce is (of course!) correct. You can find more details in our Getting Started document. There are sections on updating for macOS, Windows, and Linux. |
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I followed your indication, and the compiler gave me an error about the version esp-idf. C:\Users\fly3\projects\moddable\examples\piu\k9>mcconfig -d -m -r 90 -p esp32/moddable_two What can I do ? |
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I installed click module, and now I get this error: C:\Users\fly3\projects\moddable\examples\piu\k6>mcconfig -d -m -r 90 -p esp32/moddable_two bles2gatt bleservicesReconfiguring ESP-IDF... ESP-IDF v4.2 It seems that "IDF_PYTHON_ENV_PATH" is not setted. Is it a system or user variable ? How can I set it? |
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I resolved some problems about requirements and this is my last situation: C:\Users\fly3\projects\moddable\examples\piu\k6>mcconfig -d -m -r 90 -p esp32/moddable_two bles2gatt bleservicesReconfiguring ESP-IDF... ESP-IDF v4.2 This is the error when I try to install " pip install gdbgui==0.13.2.0 " WARNING: Discarding https://files.pythonhosted.org/packages/cf/c6/aa3ac939ec1028b7e0998c4ed88d9cd18782ca458e834f0faaad2823af3a/gevent-1.3.1.tar.gz#sha256=600d02a31c08936fe4a5181756009a4a3663403b41bc122df039dae0aa3e3831 (from https://pypi.org/simple/gevent/) (requires-python:>=2.7,!=3.0.,!=3.1.,!=3.2.,!=3.3.). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output. |
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My problem not resolved yet :-( the error disappears if I delete: from my manifest. How can resolve the problem? |
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I put together a simple test that combines the classic Piu balls example with TC53 Serial IO. It works well on ESP32. Here's what you need to do to try it.
moddable/modules/io/manifest.json Lines 12 to 18 in 4ae9126 To this: "*": [
"$(IO)/common/builtinCommon",
"$(IO)/i2c/$(PLATFORM)/*",
"$(IO)/spi/$(PLATFORM)/*"
],
"commodetto/Bitmap": "$(COMMODETTO)/commodettoBitmap",
"include": [
"$(MODDABLE)/examples/manifest_base.json",
"$(MODDABLE)/examples/manifest_piu.json",
"$(MODDABLE)/modules/io/manifest.json"
],
import {} from "piu/MC";
let serial = new Host.io.Serial({
...Host.Serial.default,
baud: 115200,
format: "buffer"
});
moddable/examples/piu/balls/main.js Lines 39 to 40 in 4ae9126 add this: if ((dx !== this.dx) || (dy !== this.dy))
serial.write(ArrayBuffer.fromString("bounce " + dx + ", " + dy + "\n"));
The ESP-IDF serial monitor should start when the build launches, so you can see the output. If not, connect a serial monitor at 115200 8N1. |
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I followed the indication above and now I have this error: is not able to compile a simple test program. It fails with the following output: CMake will not be able to correctly generate this project. -- Configuring incomplete, errors occurred! |
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@mauroForlimpopoli - it looks like there's a conflict -- both TC53 IO and the Moddable Two port use the global
We'll get these changes into the next Moddable SDK update. |
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I done the modification, but it don't run corrctly. |
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Yes, that won't work. As noted above:
The code to change the backlight is not using a TC53 API and so should remain |
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I'm sorry Peter for the misunderstanding |
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Good morning, |
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The ESP32 supports up to three serial ports. From |
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I can't use |
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The code snippet above should not work. It passes
The |
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Dear Peter, If port= 1 or 2 or not setted, the serial transmits, the code run but che display is black. |
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The default wiring for a display uses pin 2 for DC. For example, here's the declaration from the Moddable Two manifest: Try using a pin that is free.
Serial port |
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I changed the port to GPIO17 and it works.(U2TXD) Now to use the U2RXD I need to release the GPIO16 that now is busy from onewire sensors. I choose the GPIO26. But the onewire doesn't work. Is it possible to move it in the GPIO26 or it needs to work in a serial port ? I need to change something on RMT ? |
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Gpio26 should be fine. Have you updated the wiring? |
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Your project is very complex. You might run a standalone test with OneWire on GPIO 26 to confirm it works in isolation. |
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In the examples I saw to import the serial command in various ways.
es: import Serial from "serial"; (mail)
"$(MODDABLE)/contributed/serial/manifest.json" (manifest)
or
let serial = new Host.io.Serial({ (mail)
"$(MODDABLE)/modules/io/manifest.json" (manifest)
or
import Serial from "builtin/serial";
https://github.com/Moddable-OpenSource/moddable/blob/e9742b49d5132f2723d3a5fca45b65cf3818d01a/documentation/io/io.md
Which is the difference between these example and what is the best solution to connect to a PC
Thank you
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