This coming week I’ll either do the USART or TWI. I haven’t decided which. If it goes well (no problems) I might get both finished. I finished the SPI. The SPI slave implementation was interesting. I ended up with three slave examples. The slave examples do need a master. As I said in the last …
This is the week I’m determined to cover the SPI interface. In the process of testing I uncovered an error in the ATmega4809 documentation. The documentation states for the IF Receive Complete Interrupt Flag, “IF is cleared by hardware when executing the corresponding interrupt vector.” This is not true. The flag must be manually cleared …
I performed surgery on the Arduino Library. Yes, it is a risky task. I had to modify five source files, but the changes are conditionally compiled. I had previously added another “board” that is the Arduino Nano Every with a 20MHz clock so I could easily select it. Now I’ve gotten rid of the ATMEGA328 …
The Arduino Nano Every does its best to mimic the operation of the Arduino Nano even to the point of making it difficult to obtain the best performance of the part. I’ve just been pulling my hairs over this and how they handled the Timer/Counters. The ATmega4809 has two types of Timer/Counters, “A” and “B”. …
Both the ATmega328 and ATmega4809 based Arduino boards have a built in temperature sensor that can be used to measure the temperature of the part, and roughly the ambient temperature. Note that the ATmega2560 in the Arduino Mega does not have this capability. In an ATmega328 based Arduino, such as the Uno or Nano, the …
The Analog Comparator has been ignored in the Arduino library software. I discussed it in my Far Inside The Arduino book for the ATmega328P parts, like the Uno and Nano. The Analog Comparator in Arduino Nano Every’s ATmega4809 is more versatile and has more features. There is now an internal DAC that can be connected …
Progress is slow as I’ve been busy with other things. I’ll probably be 50% finished with the Arduino Nano Every book in another week. I think I’ve been spending too much time answering Quora questions, which not only doesn’t get the book written but also doesn’t make me more knowledgeable as the questions are too …
I basically stopped and cowered because of COVID-19 and my wife and I being high risk. However I’m now finally back writing again. I’m hoping to get the Arduino Nano Every book done by the end of June. Examples programs will be basically to show new features and how it differs from the older AVR …
The ATmega4809 organizes I/O registers by module and puts all the registers in C structures. The older AVR microcontrollers have a flat organization. For instance, take the Data Direction register for port B. In the ATmega328P this is simply defined: #define DDRB _SFR_IO8(0x04) This puts the register at location 0x04. In the ATmega4809, all the …
Update: individual Arduino Nano Every boards have returned. https://store.arduino.cc/usa/nano-every But the headers are not attached so you have to solder them on, or go the Amazon route which appears to still have them with headers mounted. Posted in February — It looks like Arduino has discontinued sales of individual Nano Every boards. They are now …