Category Archives: Processors

Comments on an LDROBOT LD-Air Lidar

Posted on December 31, 2021 by Skye Sweeney

I purchased an LD-AIR LIDAR from LDROBOT as part of a Kickstarter campaign. I received it some time ago but did not have any time to play with it then. I just got some time this week and these are … Continue reading →

Posted in AVC, LD-AIR, Personal, Teensy, Uncategorized | Comments Off on Comments on an LDROBOT LD-Air Lidar

On watchdog timers

Posted on June 22, 2016 by Skye Sweeney

For many embedded software engineers, the watchdog timer is something that is designed in at the end. The thought is you just turn it on prior to shipping and “She’ll be right”. But this is a terrible travesty.

Posted in AVC, Processors | Comments Off on On watchdog timers

Sailboat start timer revisited

Posted on October 14, 2015 by Skye Sweeney

I have been stalled in my work on my robot. Current bug just seems insurmountable. I would come home and avoid the thing like the plague. So I decided to purposefully work on something else for a while.

Posted in PIC, Sailboat Race Timer | Comments Off on Sailboat start timer revisited

Long time no post

Posted on August 7, 2014 by Skye Sweeney

It has been a while since I last posted. A lot and a little has happened in the meantime. I went on vacation to London and had a great time, but I have not made a huge amount of progress … Continue reading →

Posted in ARM, AVC, Uncategorized | Comments Off on Long time no post

LSM303 bug fixed!

Posted on July 5, 2014 by Skye Sweeney

After several very frustrating days, I have found the root cause of my bad readings. It was not in the sensor or in its setup. It was in fact the the TWI/I2C driver code that I took from the ATMEL … Continue reading →

Posted in ARM, AVC, Pololu 9DOF IMU | Comments Off on LSM303 bug fixed!

Woes with a LSM303DLHC

Posted on July 4, 2014 by Skye Sweeney

I have a Pololu 9 DOF IMU (version 2) that uses an LSM303DLLC for the magnetometer and accelerometer. With these two sensors you can create a tilt compensated compass. It was my plan to do exactly that to get heading … Continue reading →

Posted in ARM, AVC, Pololu 9DOF IMU | Comments Off on Woes with a LSM303DLHC

Agoraphobic robot

Posted on June 11, 2014 by Skye Sweeney

I have been frustrated by a problem with my robot. Each time I would go outside to test, the robot’s processor would hang. I tried various tactics in getting to the bottom of the problem. The real bummer was that … Continue reading →

Posted in ARM, AVC | Comments Off on Agoraphobic robot

Writing to FLASH

Posted on May 5, 2014 by Skye Sweeney

You would think that writing to FLASH would not be such a big thing. But it took several days to accomplish. The first issue is that your reprogram code can’t live in the same FLASH as you want to program. With … Continue reading →

Posted in ARM, AVC | Comments Off on Writing to FLASH

Strange bug still comes and goes

Posted on April 23, 2014 by Skye Sweeney

I have this bizzar bug that comes and goes. When connected to the JTAG pod, I never see it. When operating disconnected, it will in fits and starts not boot properly. Since it never seems to happen when connected to … Continue reading →

Posted in ARM, AVC | Comments Off on Strange bug still comes and goes

Chassing random crashes

Posted on April 9, 2014 by Skye Sweeney

Last night I stopped trying to add more functionality and get to the bottom of these random crashes. If I have lots of GPS data flowing through the system the system will crash in various ways. One way includes a … Continue reading →

Posted in ARM, AVC | Comments Off on Chassing random crashes