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Ran into a similiar problem with the PIC18LF8720 chips a while ago.

After doing a great deal of testing, and having several discussions with Microchip the solution was to ensure all of the followin ...

If you are just starting out with RS485 save yourself some trouble and use one of the trasceiver chips that have fail-safe features. This will ensure you always have a valid logic level when no node ...

You really need to reduce the code in your serial interrupt handler. You should just receive, maybe validate, the packet, then once you have the full packet set a flag so a handler in the main loop c ...

For a turn-around delay, in a strict environment where I have designed all nodes, I normally use a delay of 3-5 byte periods (most of my links operate at 57.6Kbps or 115.2Kbps). If I have a PC involv ...

One thing you need to make sure of is that there is a turn-around delay before any node transmits. This is especially critical if the connection is a 2 wire, half duplex interface. There has to be a ...

Unfortunately I have not yet seen a debug environment for the PIC micros that runs natively under Linux. There are native debuggers for the Atmel AVR and TI MSP430 micros.

You may have luck runnin ...

Unless the 128MB card has multiple <=32MB partitions it will have a FAT32 format, the 32MB card will have a FAT16 format.

I have seen instances where the MMC needs to be powered OFF then back ON to force a hardware reset of the device. Normally you can just use the software reset sequence but I have encountered instance ...

As a deviation you may want to look at the Renesas M16C families. Some of the devices actually have on-chip peripherals arranged to directly handle the motor control with the quadrature encoder with ...

If you want things to come up to speed quicker, preprocess the reading and compare with the last, if the difference is larger than X, say 25%, then set last value to equal the current value, this wil ...

I suspect you may be using the wrong signaling with your SPI. You can setup the SPI for any of the 4 modes. Using the wrong mode can cause a problem like this. Also it looks like you are shifting l ...

There are a few items you are going to have a very good handle on to get anywhere near that kind of accuracy/resolution. The biggest one will the the current excitation for the RTD, there is a trade- ...

What I have always done is to have the e-stop circuitry hardwired to the motor control. I then bring a digital signal back from this circuit to the micro so it "know's" the e-stop status.

This i ...

I have had a few problems with a couple of MMC cards, but I have been able to "fix" them. It seems that the partition table can be easily corrupted in these things and depending on what you have for ...

I have normally written real time applications using a home brew pseudo task engine that runs in an endless loop. With carefull optimization of the underlying routines and some thought to the overall ...