Embedded Programming

Program my board with C & Arduino

This week's mission is to program my board to blink, with as many different programming languages and programming environments as possible.

Program an ATtiny with Arduino

Read data sheet

I started by reading the entire data sheet for ATtiny 44A. Then followed the tutorial by high-low tech to program the micro-controller with Arduino.

Choose Board

Turn Arduino board into an “in-system programmer” (ISP)

Connect the Arduino board and the ATtiny

Use the Arduino as ISP to upload the blink program to the ATtiny

Basic Knowledge Review

Program with C

Bit manipulation

Set a bit: bit_fld |= (1 << n)
Get a bit: bit_fld & (1 << n)
Clear a bit: bit_fld &= ~(1 << n)
Toggle a bit: bit_fld ^= (1 << n)
Test a bit: bit_fld & (1 << n)

	b₇	b₆	b₅	b₄	b₃	b₂	b₁	b₀
ch	1	0	0	0	0	0	1	1
mask	0	0	0	0	1	0	0	0
ch & mask	1	0	0	0	1	0	1	1

This table answers why AND, OR, XOR, NOT, and bit shifts are used for bitwise operations.
OR mask and character set only b3 to 1, leave others unchanged. AND get b3. To clear b7 from 1 to 0, NOT the mask first, then AND with ch, this set b7 to 0.
A little tutorial here.

Connect

Irina got a very good tutorial on this part.
First, check the FabISP we made is actually programmed and recognized by the computer.
Next, connect the FabISP to the computer using a tinyUSB cable, connect the FabISP board to the new board with a 6-pin wire, and finally connect back the computer using an FTDI cable.

Create a .hex file

Download Neil's hello.ftdi.44.echo.c and hello.ftdi.44.echo.c.make files. Each .c files has to have a .make counterpart.
Open the directory in which the files are located from Terminal.
Use command make -f hello.ftdi.44.echo.c.make to create a .hex file, which check errors, compiles and transfers the .c instructions into bit information.