Compiling error "expected unqualified-id before string constant"

[kmattim]

I am not able to compile the project on a freshly installed Arduino 1.8.6 with all referenced libs.

Environment:

• Arduino 1.8.6
• NeoPixelBus 2.3.4
• NTPClient 3.1.0
• ESPAsyncTCP 1.2.0
• ESPAsyncWebServer 1.2.0
• ESPAsyncWiFiManager 0.1.6
• ESP8266 community board definition 1.6.22
• Board type: wemos d1 mini
• wemos usb driver installed
• SPIFFS uploader installed and functional

Error:

WebPixelFrame:933:15: error: expected unqualified-id before string constant
static void _u0_putc(char c) {
^

WebPixelFrame:940:9: error: expected unqualified-id before string constant
void saveConfigCallback () {
^

WebPixelFrame:958:9: error: expected unqualified-id before string constant
void initSerial() {
^

WebPixelFrame:968:9: error: expected unqualified-id before string constant
void setup() {
^

WebPixelFrame:1092:9: error: expected unqualified-id before string constant
void loop() {
^

exit status 1
expected unqualified-id before string constant

[alanswx]

I moved this function up:
//Use the internal hardware buffer
static void _u0_putc(char c) {
while (((U0S >> USTXC) & 0x7F) == 0x7F);
U0F = c;
}
to right before:
class DisplayHandler: public AsyncWebHandler {

Then it seemed to compile, but I ran into problems with the ESPAsyncWiFiManager.cpp -- it wasn't compiling until I commented out
//WiFi.beginWPSConfig();
in startWPS

I need to go back to the ESPAsyncWifiManager and try to fix that. Did you build a pixel frame?

[kmattim]

I'm trying ;)

• with the mentioned changes it will compile successfully
• because I have a 16x16 LED (should be ws2812 but I think its a sk clone) grid, I changed the configuration in DisplayPixel.h

const uint8_t PanelWidth = 16;
const uint8_t PanelHeight = 16;
const uint8_t TileWidth = 1;
const uint8_t TileHeight = 1;

• LED grid is connected to D4 (so Arduino Pin 2 / Physical Pin 17) [Wemos D1 mini PinDef] I was not sure about which pin configuration to use for the NeuPixelBus object (arduino or physical style) so I tried both (2 and 17)
• same result: only 1 yellow followed by a few white LEDs are active
• the initial WiFi AP was visible and I was able to configure the correct WiFi network
• ESP reconnected to the given new WiFi network and I was able to connect via browser
• at this point I encountered some other errors and I tried to evaluate the cause:

1. Web UI -> piskel gallery -> completely empty so I tried to create a new one but got an error during save with a web message "unknown error" and a ESP crash with stacktrace on serial console and reboot

Fatal exception 9(LoadStoreAlignmentCause)
ctx: sys
[...]
Soft WDT reset

2. Web UI ->file editor -> Web UI is loading but on serial instant ESP crash with stacktrace and ESP reboot -> because Web UI is still trying to async load data this ends in an ESP crashing loop until I close the file editor UI

3. Web UI -> display clock -> shows message "clock started" but no reaction on LEDs

4. Web UI -> show GIFs -> shows message "starting gif loop" and serial is clearly in the gif loop because of "gif finished" messages but no reaction on LEDs

5. Web UI -> Text with color -> shows message "Setting scroll to: Hello" but no reaction on LEDs

[alanswx]

Do you have a 3 to 5 V converter in place?
on my D1 Mini it is labeled as the RX pin or 21.

In the code it is 2, but for ESP8266 it is ignored, see:
https://github.com/Makuna/NeoPixelBus/blob/e13f9599c80bc5872f614d7cc184547b11aa225c/examples/NeoPixelTest/NeoPixelTest.ino#L17

This is because of the way they use the DMA to make it fast and not use much processor.

[kmattim]

Yes I am using a 74AHCT125 shifter for the data line.
Changing to the RX pin did the trick and now text, clock and GIFs are shown in the LED matrix ... only issue, all is mirrored?

Tested pliskel and file editor again but they've got the same ESP crash with stacktrace on serial debug.

[alanswx]

We are getting closer!

Did you upload the files to the spiffs storage?

Not sure why they are mirrored. I think there are some settings in the led code to switch the order. Or you might need to rewire the pixels.

[kmattim]

Yes I uploaded the data folder to the spiffs without an error and the web ui is available too; also pliskel web ui and the GIFs within the data folder are directly accessible - until I save in pliskel or try to access the spiffs editor.

The LED grid is manufacturer premade, so no chance of rewiring. I tried some manual reading from a bmp to LED matrix and the orientation was correct ... maybe something within neopixelbus and modes - I will have a look into that.

[alanswx]

Please post a link to the LED grid. Thanks!

[alanswx]

This should work now. you might need to update.