Embeded Programming / Mónica Pedro / Fab Academy 2018

Preparation

AVR architecture basics: on Wikipedia

Since I would like to use an Arduino, I searched around and found a good basic video on the architecture: ATmega328 Architecture Overview.

some transcripted notes from the video:

...is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture
...By executing powerful instructions in a single clock cycle, the ATmega328P achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consuption versus processing speed.
......but what's MIPS????
- ...MIPS stands for Million Instructions Per Second, which is a mora accurately way of describing speed
- ... Instead of focusing on the cycles per second or Hz/MHz, we focus on the instructions per second
- ......and since microcontrollers can execute a LOT of instructions per second, we use Millions of instructions per second!
... the CPU

... where all the instructions are executed
... direct connection with the Flash and SRAM memories, two different bus for data and instructions:
- Flash: store messages
- SRAM: stores temporary data

...Power Superision

... BOD - Brown-out Detection - detect when the voltage is dropping
...... and do something when this is happening

... Oscilator - System clock
... Whatchdog Timer Oscilator - monitor if the microcontroller is working properly
... EPROM stores data until we want if to, while in SRAM its ost when power off
...Data Bus - single line connecting everything

shared bus
in it we can find all the peripherals in the microcontroller
all of this are peripherals:
- T/C - Timer /Counter - which can count time and events
- USART - Universal Synchronous Asynchronous Receiver Transmitter - allows us to communicate through serial from external devices
- Analog Comp. - to compare voltage great or lower than the specified voltage
- SPI - Serial Programmer Interface
- A/D Conv. - Analog to Digital Converter
- Internal Bandgap - which is:
  - temperature independent voltage reference
  - it produces a constant/fixed voltage regardless of the power supply variations, temperature changes and circuit loading from a device
- TWI - two-wire bus
- PORT's - there's 3, which are the external PINs to the microcontroller, namelly:

Going through Atmega Attiny328P Data Sheet i found important to keep the followinh notes:

Arduino as ISP

The programming process uses a VCC, GND and four data pins. Three pins connect MISO, MOSI and SCK between the programming micro and the target micro, thr fourth pin from the programming micro goes to the reset pin of the target.

...but at the MILL I could only find a Arduino clone: Freaduino UNO V.1.8.1. which seems to work the same way

made the connection between BlinkyBoard ISP Head to Freaduino ICSP head, which result in ERROR

Fortunately Timoteo was at MILL to help me, and after some deep analysis of the Arduino Board Schematic, proposed to connect the RESET pin directy to Pin13 of Arduino

to Test the board used the Arduino IDE example Brasic - Blinky, where I changed the Pin on the code

substitued the LED_BUILTIN with the pin number of my board, in this case pin 7, here is the final code that worked:

Now making my own program to create interaction with the Tactile Witch

using the actual connections I tried the EXample code for button provided by Arduino Tutorial Button

programming using C

VIM editor main commands

Where I learned that MAC's already have a C compiler insider, and most important of Alll . I learned what a MAKE file was for... my tutores had not...

Mónica Pedro