Support for ESP32C3

[hpsaturn]

Overview

The library fails with ESP32C3 over Espressif 5.0.0 and also over Espressif 6.0.0. With other variants, like ESP32, 8266 and also Atmelsam works fine.

Compiling .pio/build/ESP32C3/lib658/S8_UART/utils.cpp.o
.pio/libdeps/ESP32C3/sps30/src/sps30.cpp: In member function 'bool SPS30::setSerialSpeed()':
.pio/libdeps/ESP32C3/sps30/src/sps30.cpp:1097:13: error: 'Serial2' was not declared in this scope
             Serial2.begin(_Serial_baud);
             ^~~~~~~
.pio/libdeps/ESP32C3/sps30/src/sps30.cpp:1097:13: note: suggested alternative: 'Serial1'
             Serial2.begin(_Serial_baud);
             ^~~~~~~
             Serial1

Dependencies:

Resolving ESP32C3 dependencies...
Platform espressif32 @ 6.0.0 (required: espressif32)
framework-arduinoespressif32 @ 3.20006.221224
sps30 @ 1.4.14

Thanks in advance.

[paulvha]

Thanks for the finding. I have corrected and just uploaded the new version 1.4.16. let me know

[hpsaturn]

Thanks!

[hpsaturn]

Hi again,

I bought new SPS30 sensors for tests, when these arrived I did some extra tests with my old UART setup using only ESP32 boards, and I found that this validation (#if Serial2) doesn't works for them. Validate with Serial2 only works for ESP32C3, and for this reason we close this issue. But the right way to validate the Serial2 interface in the both architectures is using:

#if SOC_UART_NUM > 2 for the ESP32, because it resolve 3. For the ESP32-C3 resolve 2.

In my library I have a similar block:

case SERIALPORT2:
        #if SOC_UART_NUM > 2
            DEBUG("-->[SLIB] UART COMM port \t: Serial2");
            if (pms_type == SENSORS::SSPS30)
                Serial2.begin(speed_baud);
            else
                Serial2.begin(speed_baud, SERIAL_8N1, pms_rx, pms_tx, false);
            _serial = &Serial2;
            break;
        #else
            DEBUG("-->[SLIB] Force UART port \t: Serial1");
            Serial1.begin(speed_baud, SERIAL_8N1, pms_rx, pms_tx);
            _serial = &Serial1;
        #endif

[paulvha]

Don't understand the issue. I use (#ifdef Serial2 ) not (if Serial2). If there is no Serial2 defined, I can not use it.

In the sketch the right Serial port to use should be provided. As indicated in the Readme, I kept the "old" structure in for backward compatibility. For future implementation with serial, I would rather see that example12 setup for serial communication is used. Much easier :-)

[hpsaturn]

Sorry, I did a mistake, I want to say ifdef. In my previous version I was using your similar workaround (ifdef Serial2):

but it working with C3, but with ESP32 and Espressif 4.4.0 for example, this validation doesn't works.