Some progress has been made the past few days on the actual Renesas EC chip. A detailed log will probably follow in the upcoming few days, once I get the chance to take a few pictures and screenshots.In 2014 I etched a PCB to mount the EC on after desoldering...
Had to dig into the FPGA code for the SD card. Using Neal Crook's documentation of Grant Searle's version (longer pedigree on the page). The status register values are: // SD_Status bit values from Neal Crook's documentation of Grant's SD card // b7...
In this project, instead of using a standard embedded processor and programming it to execute 3 tasks at hand (parsing HEX character stream, generating HEX character stream, and writing character stream to video RAM driving VGA), I created 3 independent...
I tried a couple of other cards and found that they have different MBR formats with no header. I noted this in a previous log. There's an offset at 0x01BE that points to the MBR. My theory is this is true for "bigger" cards. I think the reason I could...
Digging into SD card writes means shifting gears from the Boot BIOS source code since the Boot BIOS code only does reads. The CP/M BIOS code (CBIOS128.LST) which does the reads/writes after booting. Here's the BIOS code for writes to the SD Card: 0754...
While revisiting key handler handleKeyScanCode_EE37 and back annotating scan codes into the code, I wind up with this:EE37 handleKeyScanCode_EE37: EE37 13 63 01 04 brclr bCloverKeyDown_63 1 noclover_EE3F ; true if 'clover key down' EE3B 12 61 01 C9 brset...
In this chapter, the fundamental concepts of hexapod robots such as walking gaits, stability, kinematics and dynamics are covered which are essential to obtain a better understanding of the control architecture that is delivered in the next chapter....
In the latest news on the BeefyDuino frontier, my friend Ryan who is the founder of elequa, the company I am helping to start, assembled eight BeefyDuino prototypes (with a little help from his friends including me). He did this because he was going...
After I convinced myself that the emulator was probably OK, I turned back to the ROM. But after I found yet another ROM image online, and it turned out to be identical to the other three, I have to rule out bad ROM as well. Just as well as I was...
While whizzing through the keyboard stuff, there is some special handling of some keystrokes. This is by scan code, so it's difficult for me to puzzle out what they are. One exception, though, is for setting the 'send speed'. There...
As you can see airodump-ng picked up the WiFi of the drone and also that it is running on channel 2. Next I recorded some packages. sudo airodump-ng -w JJRC_out -c 2 -bssid 10:A4:BE:2E:77:B5 wlan0mon While recording I simply used all the functions the...
Summary:It occurred to me that it would be useful to save some configuration in a non-volatile manner. This board and this chip does not have any conventional non-volatile storage (e.g. EE or external serial EE), but there's plenty of pages of unused...
As you can see below, I am breadboarding the new peak detector changes before committing to a new PC board. One of the changes involves using a MAX5387 digital potentiometer to control the square wave amplitude and EC amplifier gain. The...
(for related subject, run-time initialization of ROMs/RAMs, see here) FPGA-based designs often have various read-only stores. Their content can be defined in different ways: Inline in the source code (appropriate for smaller ROMs)Using vendor-specific...