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* Refactor the linker script to make more sense.broken_linkerJosh Rahm2022-12-09
| | | | | | | Specifically this moves the inits into the .text section. This also move the data and bss segments into sram2 to give the heap and stack more space to work with in sram1.
* Fixed linker script on desktopJosh Rahm2022-12-08
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* Add broken linker stuff to test on desktop.Josh Rahm2022-12-08
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* run clang-format.Josh Rahm2021-10-26
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* Fix Init Level Logging.Josh Rahm2021-10-26
| | | | | | | | | | | | | The linker script was broken because the init_boundaries were showing the incorrect value. It's fixed now. Unfortunately there's a bizarre bug where if I add another klogf() statement in the run_init_routines() function, I lose _all_ logging. I have no idea what is causing this! The only thing I can think of in an honsest-to-god complier bug. It probably has to do with some bizarre-o optimizations GCC is doing. In the time being I had to shuffle the finishing routines logging to the init() function directly ... unfortunate.
* I figured out how to align the data section.Josh Rahm2021-10-26
| | | | | | I tried this before, I swear and it didn't work. Not sure what I did to make it work this time. I guess that goat I sacrificed appeased the right gods.
* Removed the requirement for the init data to be aligned.Josh Rahm2021-10-26
| | | | | | I don't yet know how to configure the the initscript to align the INIT_DATA_VALUES. Nothing seems to work. But whatever, it seems like things work and it's a very minor performance hit.
* Merge branch 'christmas' into HEADJosh Rahm2021-10-26
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| * Completed ws2812b 2020 Christmas Lights.ir_ledsJosh Rahm2021-09-27
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| * Can read from the A/C remote control!test_irJosh Rahm2020-12-09
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| * Got a basic timer to work.Josh Rahm2020-12-09
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| * Added header files implementing a basic AVL tree and Map based off it.Josh Rahm2020-12-06
| | | | | | | | | | | | | | | | These headers take inspiration from the linked list and array list headers as a way to provide primitive templates in C. This time they implement an AVL tree and Map template (which uses the AVL tree). Included are relatively robust tests, though they could be improved.
| * Add remove ability to linked list.Josh Rahm2020-12-05
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| * Got a very basic external interrupt to work.Josh Rahm2020-12-05
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* | Fixed annoying bug with bootup when compiling with new GCC.Josh Rahm2021-10-26
|/ | | | | | | | | | | | | | The problem was the BSS segment was not aligned with size 4, thus the routine to clear the BSS segment was infinite looping, clobbering everything in it's wake until it ran off the memory edge and caused a hard fault. This commit does a couple of things. 1. Fixes the alignment issue in the linker script 2. Panics if the bss/data segments are not aligned properly 3. Makes the logging the _first_ thing to initialize. Much easier to debug that way!
* Add a little white flair to the LED stripworkingJosh Rahm2020-12-05
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* Added some better implementation around the ws2812b driver.Josh Rahm2020-12-04
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* Added kernel-level abstraction over the spi interface.Josh Rahm2020-12-04
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* Add systick/...Josh Rahm2020-12-04
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* Double the SPI bandwith by writing only 8 bits to the spi data register ↵Josh Rahm2020-12-03
| | | | instead of 16 (with 8 leading 0's).
* Basic working example with minimal flicker and correct color.Josh Rahm2020-12-03
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* The lights really work this time.Josh Rahm2020-11-29
| | | | | | | I also found out that the noise in the lighhts was coming from the USB debug interface. For whatever reason it doesn't appear that the spi pins are not well isolated from the debugger noise so unplugging and running off one power source works pretty well.
* Have a stable red/green pattern on my LED strip.Josh Rahm2020-11-29
| | | | | | | | | | | | | | I finally got a stable red/green pattern to show up on the LED strip. Unfortunately I had to do this manually because my driver is broken. No Dma, interrupts or drivers, but manually writing to the spi bus. Currently the driver assums the data sheet doesn't lie and inflates each bit 3:1 so a 1 is a 110 pattern and a 0 is a 100 pattern. This should be well within the tolerances at 2.5Mhz, but alas it's not. I figured out that it's better to inflate each bit to a 4:1 ratio so a 1 is a 1100 pattern and a 0 is a 1000 pattern. This appears to produce cleaner results.
* Some LED lights working. Not great. WIPJosh Rahm2020-11-28
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* Fix kalloc bug.Josh Rahm2020-11-28
| | | | | | | | | | | | | | | | | | | | | | Bitfields are officially stupid. Bizzarre behavior was found in how the bitfields integers were overflowing and causing other members to change value, causing really screwy behavior. In addition, with the discovery of 48k being available to the heap, a 12-bit value was no longer sufficient to define the size. I rewrote parts of the kalloc code to allow a generic size for the kalloc header because now it'll require 2 words per block allocated, and who knows what size the header will be on different platforms with more memory. Unfortunately, the second word of the header consists only of the "used" bool. Because I wish to keep alignmennt with 32-bit words, 31 bits are "wasted." However, these bits are used as a canary value to detect heap corruption, so they're not completely wasted. Also, testing was broken since adding the huge amount of platform dependent code for doing system calls. These dependent parts were put under a macro guard so they don't interfere with the x86 testing.
* Basic SPI working.Josh Rahm2020-11-26
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* Add ability to jump to a usermode init routine.Josh Rahm2020-11-25
| | | | | | | | This routine will has a newly allocated stack. I found out that when using the st-flash utility it likes to reset the device with the IPSR in HARD FAULT mode (?) so I have to manually hit the reset button to get it to work.
* Primitive ability to call kernel code from userspace.Josh Rahm2020-11-25
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* very sloppy svc handler.Josh Rahm2020-11-25
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* Add priv.h/c to allow switching to user mode. Change some things with the ↵Josh Rahm2020-11-25
| | | | MPU in main() to actually work.
* Add module for controlling the MPU.Josh Rahm2020-11-25
| | | | | | | The MPU is a module in arm chips which allow for memory access protection. They are more primitive than full MMUs, but can still provide at least basic access control between different process controls.
* Changes to painic. It now prints the stack at the time of failure (if ↵Josh Rahm2020-11-24
| | | | logging is initialized).
* Fix kalloc. Now the HEAP START and HEAP END globals are defined by the ↵Josh Rahm2020-11-24
| | | | linker script.
* Add better logging capabilities, including the ability to panic.Josh Rahm2020-11-24
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* Update .clang-format and run it on filseJosh Rahm2020-11-24
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* rename halloc to kallocJosh Rahm2020-11-24
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* Moved action to top level.Josh Rahm2020-11-24
Removed old iterations of the project and moved the files from 02-usart to the root directory since that's the sole place where the action is and that subproject has outgrown its initial title.