All Blog Posts (53)

In one of my define tables, if the table gets to a certain length I get a bug in my code. Just take one character away from that and everything is fine. I have found no significance in regard to... actually, I never counted it until now.

If there are 33 characters, my code bugs out. 32 is okay. Well, 32 is a very important number, but I have longer tables elsewhere. There is also no reason for this to bug out. It's simply absurd!

Each dt (define table) directive uses up a line for each character in your table/string. If you're not careful, your code could get long despite being short.

Here's how the define table directive works. Each character in your string is actually translated into a single retlw (return literal in W).

For example:

dt "Hello!"

is translated into:

retlw 'l'
retlw 'l'
retlw 'o'
retlw '!'

If the path size of your MPLAB project's directory is too long, for example:

C:\Users\Main\Desktop\ritchie-thai\current-projects\aer201

then a .hex file will not be created.

I am now using a workspace with the much shorter path:

C:\mplab-test\KeyPad_LCD

Don't computers suck?

Tennis%20Ball%20Rolling%20Experiments.xlsx

tl;dr

I rolled about 1000 tennis balls down an incline. It turns out that you need an angle greater than 7.7* to ensure a column of tennis balls will roll without error.

list p=16f877                 ; list directive to define processor      

#include <p16f877.inc>        ; processor specific variable definitions    

 __CONFIG _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _HS_OSC & _WRT_ENABLE_ON & _CPD_OFF & _LVP_ON

cblock 0x20

 COUNTH

  COUNTM

  COUNTL

endc



         ORG       0x0000     ;RESET vector must…

Altium and Eagle are great softwares for PCB design. The softwares can be used to generate schematics and this information (all the parts and connections) can be automatically transferred to a PCB design layout where the parts can be manually arranged and then automatically routed (for relatively simple layouts). Altium also has a simulator and a 3D design layout mode that is helpful for complicated design. Eagle does not have these functions. However it is much less expensive than Altium.…

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... and doc: retards.org/library/technology/electronics/pic/libraries/karl_lunt/picmacro.pdf

Transactions: A USB transaction has three parts: the token packet, the optional data packet, and the status packet, which represent the header, payload, and data

acknowledge, respectively. Since USB is host-driven, the host initiates

transactions by sending the token packet. It also sends packets to indicate the

start of each frame, every millisecond. Packets on this layer are taken care

of, so the…

Often times in project coding development, the programmer need to generate some sort of delay. It is hard and tedious to calculate by hand, an alternative way is to use the Pic Delay Code Generator for ASM Programmers made by N Golovchenko.…

It is quite clear that the I2C bus can be very confusing for the newcomer. This short article therefore tries to de-mystify the I2C bus, I hope it doesn't have the opposite effect!…

All IBM PC and compatible computers are typically equipped with two serial ports and one parallel port. Although these two types of ports are used for…