Now open main.s, delete everything if it’s not empty and add the following code.

Your workspace ends up looking like this: Rename the file from GNUArmAssembly01.s to main.s Now right clock on “Source Files”, select “Add New File” and select “GNU ARM Assembly File” in the dialog. Now under “Source Files” in the workspace directory you will delete main.c and replace with main.s Yours may be in a different place on whatever board you are using. CYDWR file and drag pin LED to P2, since that’s where it is on the LED board. We’ll start by creating a standard project in PSOC Creator, drop a Digital Output pin on the schematic and call it “LED” It’s just what happens to be laying around on the lab bench. We’ll use a CY8CKIT-145 and blink the LED. There’s a certain human creativity that algorithms can’t match.Īll that being said, I had not seen a good “machine code 101” tutorial for writing assembly in PSOC Creator on modern ARM M0 processors. In my experience, a good programmer with expert knowledge of the instruction set and CPU resources can always write better code than a compiler. For example, we can simplify the above code as follows: The fun thing about assembly is you can always dream up cool ways of doing things in less operations based on the machine’s instruction set. Assume P is at RAM location 0x20 and Q is at location 0x21, and R is at 0x22 To get the M8C to execute 2+3=5 we write: You can reference the M8C assembly language user guide here for more details.

We’ll start with simple machine code instruction to make the CPU do something. In the case of PSOC1, here’s what you had to work with: 5 registers, some RAM and Flash. There’s a certain elegance to well written, fully commented machine code.

That’s not so bad, since I actually enjoy it more than C. Consequently, I wrote a lot of assembly code. A single C library could consume the entire Flash. With CPU resources at a premium, you had to write tight, efficient code to get the most out of PSOC1. For instance, I once implemented a complete ultrasonic ranging sensor with full wave analog demodulation in a single PSOC1 as shown below. This may not sound like much, but with a creative mindset you could get these parts to do amazing things. Wrapped around that was a neat array of programmable analog and digital blocks. It used a Cypress designed 8 bit CISC processor running at 24 MHz, with as little as 4 KB Flash and 256 bytes RAM. Cypress introduced it’s first mass market microcontroller in 2001.

Psoc software