diff options
Diffstat (limited to 'notes')
| -rw-r--r-- | notes/portable.txt | 94 | ||||
| -rw-r--r-- | notes/usb.txt | 4 | ||||
| -rw-r--r-- | notes/vga.txt | 9 |
3 files changed, 17 insertions, 90 deletions
diff --git a/notes/portable.txt b/notes/portable.txt index 69952d7..cc1f2ac 100644 --- a/notes/portable.txt +++ b/notes/portable.txt @@ -1,98 +1,28 @@ +Board portability is implemented in boards.h, libmaple.h, and stm32.h. -Disclaimer text: // High-density devices only (Maple Native) +At compile time, we currently expect one of STM32_MEDIUM_DENSITY or +STM32_HIGH_DENSITY to be defined. There's no support for low-density +chips. XL-density isn't in the near horizon; patches welcome. You'll +also need to define some BOARD_foo if you expect to use Wirish; this +comes along with some additional assumptions about your board's layout. +The code in usb/ is not very portable at all right now; expect this to +change in the future, but for now, we're focusing on rolling out a +more complete backend. -Board portability is implemented by adding a header file to ./libmaple with the -name of the BOARD target, and then editing libmaple.h to add this file as an -option. - -A pin maple file should be added to ./notes describing the pin numbering - -Files to check by hand: -# adc.c -# adc.h -# exc.c -# exti.c -# exti.h -# flash.c -# flash.h -# gpio.c -# gpio.h -# libmaple_types.h -# nvic.c -# nvic.h -# rcc.c -# rcc.h -# ring_buffer.h -# rules.mk -# spi.c -- spi.h -# syscalls.c -# systick.c -# systick.h -# timers.c -# timers.h -# usart.c -# usart.h -# util.c -# util.h -# libmaple.h -# usb/* - -wirish/: -# bits.h -# boards.h -# cxxabi-compat.cpp -# ext_interrupts.c -# ext_interrupts.h -# HardwareTimer.cpp -# HardwareTimer.h -# io.h -# main.cxx -# Print.cpp -# Print.h -# pwm.c -# pwm.h -# rules.mk -# time.c -# time.h -# usb_serial.cpp -# usb_serial.h -# wirish_analog.c -# wirish.c -# wirish_digital.c -# wirish.h -# wirish_math.cpp -# wirish_math.h -# wirish_shift.c -# WProgram.h -- comm/ - - - -ADC Notes: - only using ADC1? - untested - -EXTI Notes: - need to update huge table in comments? - untested +A file should be added to ./notes describing the pin numbering of any +new board you add. NVIC Notes: - I don't think NVIC_ISER3 and NVIC_ICER3 actually exist? Only CANBUS and USB OTG use interrupts above #63, but I updated the nvic code anyways RCC Notes: Added some clock stuff to all boards even though they aren't usable... blah. SPI Notes: - SPI3 is only in XL chips so didn't really handle that + SPI3 is only in XL chips, so we don't handle that. TIMER Notes: - High-density devices add an advanced timer (TIMER8) and another normal one (TIMER5). - TIMER6 and TIMER7 are much less useful. - There is some partial progress towards adding timer5/timer8 functionality, - but not much. This should probably all be rewritten. The wirish timer implementation should be refactored to use pin numbers. USART Notes: diff --git a/notes/usb.txt b/notes/usb.txt index 5e00354..9552b9f 100644 --- a/notes/usb.txt +++ b/notes/usb.txt @@ -1,3 +1,7 @@ +XXX +XXX This file may be out of date! +XXX + [NOTE: this is a long term proposal. The current implementation just does a 2ms TIMEOUT] diff --git a/notes/vga.txt b/notes/vga.txt index d75281a..43b6830 100644 --- a/notes/vga.txt +++ b/notes/vga.txt @@ -7,8 +7,7 @@ gpio_write_bit() is about 360ns (2.78MHz) Writing to GPIO?_BASE is about 60ns (16.6MHz -> 18MHz) -pwm write 0x0001 is about 30ns (33MHz) with prescaler as 1 (default) -pwm write 0x0001 is about 14ns (72MHz) with prescaler as 0 (!) +PWM write 0x0001 is about 14ns (72MHz) with prescaler as 0 (!) VGA Timing ------------------------------------------------------------------------------ @@ -34,9 +33,3 @@ Crude 640x480 directions: 11 lines front porch 2 lines Vsync (low) 31 lines back porch - -Currently, setting vs. clearing GPIO registers seems to take a different amount -of time? Or perhaps i'm not analyzing branching correctly. Regardless, if you -SET 100x times then UNSET on one line, then UNSET 100x then SET the next line, -the two changes in color will generally not line up. - |