It differs on each one and it only defines Serial1 here and that's it. Here is an example of how some of the Serial1 was setup on this particular ARM based SAMD51 chip. Basically you are having to change the entire compiling environment as well for it to work. The main issue is that you cannot change this without changing the actual variant.cpp files ahead of time and then compiling and keeping those changes each time outside of your specific code base. One of the main reasons to be checking here is due to this code requirement: Reasonably sure that there are at least 3 specific RX and TX sets of pins here plus the CAN ones which are separate as well? You could likely setup more than that as well depending on what connecting main chip you are using but that's a separate consideration here.Īnyway, this all means that pins D0 and D1 are actually RX and TX pins that are effectively UART compatible? Just technically called RX1 and TX1? Instead it is D0, D1 then RX1, TX1 then RX, TX? RX, TX then RX1, TX1 then RX2, TX2 and so on. Typically pins D0 and D1 are labeled RX and TX and obviously it can have multiple RX and TX pins since it is typically SERCOM now anyway but I guess very, very typically things are setup for the first set to be RX and TX and then other ones have a different name is all to keep things a bit more straightforward and clear. I guess the main issue is why is it called D0 and D1 and then over a bit after RX1 and TX1, there is another set of pins labeled just TX and RX? It appears that the ATP just doesn't do that? Here's a SparkFun SAMD21 and you can see how it has a RX and TX port as the basic serial ports that are default ones. Will do more testing after hardware arrives but still unclear where the Serial and Serial1 hardware is with the ATP devices and does the code support them or do we need to modify the Arduino IDE hardware code in order for it to properly use the hardware? in theory tries to help but in practice it doesn't do a great job and doesn't migrate over well to SAMD51, let alone RP2040 either. Because defining extra ports despite the hardware being able to support the SERCOM there varies so much and also just doesn't work by default. One of the big annoyances is the difficulty of trying to use anything other than the "assigned" serial port and existing code provided. Just not quite following how easy it is in both hardware or programming needed or provided by SparkFun to be able to use ports D0 and D1 or which ports are easily able to be used as Serial or Serial1, meaning actual hardware serials (or even PIO style RP2040 serial ports). Plus the RP2040 can swap the positions around pretty substantially compared to needing to literally chart it all out for even the ARM SAMD21 and SAMD51 chips. The SAMD21 and SAMD51 boards are becoming increasingly popular in part because of this feature. The SAMD21 has 5 different internal ports which you can configure to use any combination of UART, I2C, and SPI. For example, the ATmega328 which has UART (RX/TX) on one pair of pins, I2C (SDA/SCL) on another set, and SPI (MOSI, MISO, SCK) on another set. It allows you to select various serial functions for most of your pins. SERCOM (Serial Communication) is a multiplexed serial configuration used on the SAMD21, SAMD51 and other boards. We understand that the ATP isn't the same as the SAMD21 but you can always add a SAMD51 main chip to it. The Arduino IDE equips the SAMD21 with two hardware serial ports, by default, plus a third "USB serial port" for communicating between the serial monitor.Įach of these serial ports has a unique Serial object which you'll refer to in code: To print information to the Arduino IDE Serial Monitor.One of the SAMD21's most exciting features is SERCOM - its multiple, configurable serial ports. Serial object on standard Arduino boards. Teensyduino provides a Serial object which is compatible with the
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