Fast update from last post. I got ChaN’s FAT32 working and can read and write files at 200kbytes\/second. Not too shabby.<\/p>\n
With the FAT32 behind me, I set myself the goal of connecting my uBlox LEA-6H module to my ARM processor this weekend. As it turns out, I missed my goal, but I got awfully close.<\/p>\n
The reason I failed was that I decided I really needed an sprintf routine. Somehow my Yagarto system libraries do not include sprintf. I think because they do not include malloc\/sbrk. I was unwilling to write the memory allocation interface, so I spent a day and rewrote my version of snprintf. It does %d, %u, %c, %f, and the always useful %%. It also support the width, and other options. Not terribly fast yet, but the basics are in place.<\/p>\n
This allowed me to gut my code of awful debug code I was using to print bits of critical information. The code is much cleaner now.<\/p>\n
I also had to write a device driver for the serial ports. I have been using the DBGU serial port on the Atmel SAM7 for a debugging serial port. Works great, but I needed to modify it to support the US0 and US1 serial ports. Luckily they are all nearly identical and I was able to modify the code such that the basic routines (read, write, configure,…) now simply take an argument for the port to use. But till just recently I have been tearing my hair out as to why it was not working. As it was getting close to bed, I decided to stop for the night and check in all my code into GIT. As a comment, I added all the possibilities as to why it was not working. As a joke I said “and perhaps I did not set the “make it work” bit”. As soon as I wrote that, I realized that that is exactly what I forgot to do. I failed to turn on the clock to the other UARTS. I set one register, and poof it works.<\/p>\n
My goal for this week is to mechanically and electrically mount the GPS module to my test board and start getting the software to parse the binary data stream. I already have the code from another project to do this, so it should not be to hard to get that up and running. Perhaps by the weekend I will be getting the data and writing it to my new SD card interface.<\/p>\n","protected":false},"excerpt":{"rendered":"
Fast update from last post. I got ChaN’s FAT32 working and can read and write files at 200kbytes\/second. Not too shabby. With the FAT32 behind me, I set myself the goal of connecting my uBlox LEA-6H module to my ARM … Continue reading