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50 most recent check-ins
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2022-06-27
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| 16:58 | Fixed warnings issued by the ERC. Leaf check-in: 35cad36729 user: thomas tags: schematics | |
| 16:33 | Fixed duplicate reference for the Zener diodes. check-in: 69ea8523c8 user: thomas tags: schematics | |
| 16:31 | Added the USB bus data line connections. check-in: b99ee67ae7 user: thomas tags: schematics | |
| 16:01 | Added capacitor value and footprint for the oscillator capacitors. check-in: fbabf69a9f user: thomas tags: schematics | |
| 14:00 | Added the oscillator circuit and added a few more footprints. check-in: 6b46e2b54d user: thomas tags: schematics | |
| 13:05 | Set resistor values of series resistors connected to the NE555 to 2.2kΩ. check-in: bd0c11bb02 user: thomas tags: schematics | |
| 12:58 | Cleaned up the wire layout. Named the DB15 connector to mention that it is a Gameport connector. check-in: f8e699a2ee user: thomas tags: schematics | |
| 09:49 | Connected the axis trigger connections and the digital axis timer output connections via two busses. check-in: f0575f9ca3 user: thomas tags: schematics | |
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2022-06-26
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| 17:14 | Continued the schematics. Use a bus for the digital buttons. Set some footprints check-in: 284c1268c5 user: thomas tags: schematics | |
| 15:32 | Added (incomplete) schematics. The circuit is still WIP and has to be completed. check-in: e0c1ed4f88 user: thomas tags: schematics | |
| 13:12 | Implemented reading all four axis using NE555 timer ICs. Each axis is measured sequentially. Start the built-in 16 bit timer when triggering a measurement and stop it when a pin change interrupt indicates that the capacitor is re-charged. By using the 20MHz CPU clock to directly count the CPU cycles during the measurement, the results are precise enough within a 1ms time frame for each axis. Completes [4e3bbad2d82ce9d4]. Leaf check-in: 18c8b179a8 user: thomas tags: trunk | |
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2022-06-25
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| 16:56 | Reduce button jitter by reading the buttons three times, once before first axis measurement, once in between the first and second and once after the second axis read. Closed-Leaf check-in: da7b523657 user: thomas tags: read_interrupt | |
| 16:36 | Reduce jitter by performing two reads of the analog axis and return the arithmetic mean. check-in: 9aedf96523 user: thomas tags: read_interrupt | |
| 16:09 | Refactored clamping logic for read values into a separate function. check-in: fc41e35b5a user: thomas tags: read_interrupt | |
| 15:06 | Enable reading the second axis pair. check-in: 3ecf6722bd user: thomas tags: read_interrupt | |
| 14:58 | Reduce the wait time for unconnected axis by 50%: Instead of letting the 16 bit timer 1 overflow at 0xFFFF, stop the timer when it hits 0x7FFF. check-in: 0dc3116425 user: thomas tags: read_interrupt | |
| 14:36 | Fixed issues with the interrupt-based axis measurement. This approach takes significantly less time per axis (around 2.5ms for 2 axis with 10nF capacitors and a resistor of 4.6kΩ.) than the software-based polling. check-in: a3acc6eab4 user: thomas tags: read_interrupt | |
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2022-06-24
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| 16:00 | Clamp the read values into the output range to prevent the axis from overflowing when reading takes too long. Closed-Leaf check-in: f925eb92f9 user: thomas tags: parallel_polling | |
| 15:41 | Use loop unrolling via a GCC pragma to save a few % cpu cycles. This increases the sampling rate enough to be viable when combined with a 100nF capacitor and an 11kΩ resistor. check-in: 5fabc942a0 user: thomas tags: parallel_polling | |
| 14:55 | Implemented parallel reading using mostly 8-bit additions. check-in: f6dffb79d9 user: thomas tags: parallel_polling | |
| 13:04 | Optimize inner loop: Remove bitshifts. Instead shift the final result once. check-in: af1ae26b66 user: thomas tags: parallel_polling | |
| 12:21 | Removed delays. Use the correct register to read the pin values: Read from PINC instead of PORTC. check-in: b077a3591f user: thomas tags: parallel_polling | |
| 09:28 | Try to poll all axis in parallel, instead of reading them sequentially via interrupts. This currently doesn’t work (no value changes are reported for unknown reasons). check-in: 706727a68b user: thomas tags: parallel_polling | |
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2022-06-23
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| 19:09 | Implemented reading two of the four analog axis. This approach seems to take too much time, so breaks with heavy glitching when all four axis should be read. Additionally, the axis scaling is off and needs calibration. check-in: 7100ebb883 user: thomas tags: read_axis_ne555 | |
| 16:07 | Remove the watchdog device resets. When the joystick is not accessed, this caused unwanted device resets. check-in: 1b90f6dde1 user: thomas tags: read_axis_ne555 | |
| 09:17 | Remove unused variable. Declare constants that define the possible axis measurement states. check-in: cd2a9f2776 user: thomas tags: read_axis_ne555 | |
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2022-06-22
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| 20:08 | Removed all old code related to reading axis data via the built-in ADC. The code currently only handles the digital buttons, which do actually work and can be seen on the connected PC. check-in: 1379f1d273 user: thomas tags: read_axis_ne555 | |
| 20:05 | Implemented actually sending packets over USB. check-in: 28f77ede54 user: thomas tags: trunk | |
| 18:24 | Set the AVR sleep mode to SLEEP_MODE_IDLE to be able to use the sleep modes. check-in: 5a11fd21bf user: thomas tags: trunk | |
| 18:23 | Fixed the USB HID descriptor. Using INPUT (Data,Ary,Abs,Vol) seems to be wrong. INPUT (Data,Var,Abs) is the correct value for data input. check-in: e52a1d8d89 user: thomas tags: trunk | |
| 16:16 | Rewritten usbFunctionSetup() function to use a switch statement instead of a series of if statements. check-in: 9247fd87cc user: thomas tags: trunk | |
| 16:05 | Rewritten the hardware initialisation code. check-in: baf090f301 user: thomas tags: trunk | |
| 16:04 | Fixed report descriptor array name that diverged in commit [cc784a20ba4742bd]. This fixes linker errors. check-in: fbe3ef15e4 user: thomas tags: trunk | |
| 13:23 | Added copyright header to the ne555adc.c file check-in: 3bb5b0034d user: thomas tags: trunk | |
| 13:10 | Added executable used to experiment with NE555 timer ICs. check-in: afc7f6027c user: thomas tags: trunk | |
| 13:08 | Added USB HID descriptor file to the binary-glob option to prevent fossil from emitting warnings when checking them in. check-in: 0c76d5e6b3 user: thomas tags: trunk | |
| 13:05 | Updated the USB descriptor. The previous one exceeded the maximum allowed packet length (8 bytes) for low-speed USB devices. check-in: cc784a20ba user: thomas tags: trunk | |
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2022-06-21
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| 16:15 | Added executable testing how an NE555 timer in monostable mode can be used to read a potentiometer. Closed-Leaf check-in: dc9133f190 user: thomas tags: ne555 | |
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2022-06-18
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| 14:34 | CMakeLists: Added explicit file type suffixes to source listings. Fixes CMake warning CMP0115. check-in: 8f84e38944 user: thomas tags: trunk | |
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2022-06-17
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| 10:24 | Added commands to control the board power and reset via the connected programmer. This adds the commands as targets to the Makefile. check-in: f67d9bb827 user: thomas tags: trunk | |
| 10:20 | Renamed .gitignore to .fossil-settings/ignore-glob check-in: f4236390ca user: thomas tags: trunk | |
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2020-12-25
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| 14:43 | Enable usage of usbFunctionRead() in V-USB, as the previous implementation is wrong: The HID report is 9 bytes large, but usbSetInterrupt() only supports sending up to 8 bytes. check-in: 5b8874847f user: thomas tags: trunk | |
| 14:38 | Perform a USB reset before entering the main loop. This causes a re-connect, if the device resets. check-in: 9fb4e4ccc0 user: thomas tags: trunk | |
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2020-12-12
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| 23:52 | hwinit(): Removed setting OSCCAL, removed outdated TODO entries and fixed some wrongly used constants. check-in: 6d6060fb4a user: thomas tags: trunk | |
| 23:51 | Configure the AVR to use an external 20 MHz crystal. This is required, as the internal RC oscillator is insufficient for stable USB operation. check-in: dc42508759 user: thomas tags: trunk | |
| 23:50 | main(): Drain any pending USB interrupts before entering the main loop. Also wait 5ms to get a polling rate of ~ 100 Hz. This should at some point be replaced with a sleep. check-in: 287538a18f user: thomas tags: trunk | |
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2020-05-28
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| 16:11 | Enable the hardware watchdog with a 1 second timeout. Also pulse a pin whenever the watchdog is reset, for debugging purposes. check-in: 5970c93343 user: thomas.hess@udo.edu tags: trunk | |
| 15:08 | Increase the delay before entering the main loop. check-in: 850c8e2d35 user: thomas.hess@udo.edu tags: trunk | |
| 15:07 | Decrease the USB polling rate and enable writing packages via USB in V-USB. check-in: 3256088474 user: thomas.hess@udo.edu tags: trunk | |
| 15:06 | Adjust the OSCCAL oscillator calibration for a different device. check-in: bff53ceb53 user: thomas.hess@udo.edu tags: trunk | |