Bill Westfield

icon location Silicon Valley, CA, USA icon location Retired Software Engineer. I used to do networking stuff. Now I mostly do "small" microcontroller stuff. I also maintain Optiboot, the Arduino AVR bootloader

Results 37 comments of Bill Westfield

permit start address to be specified in monitor mode.

Um. No attachments? ``` diff --git a/stk500boot.c b/stk500boot.c index 2c868e2..fef0bf2 100755 --- a/stk500boot.c +++ b/stk500boot.c @@ -2020,6 +2020,30 @@ int ii, jj; PrintFromPROGMEMln(gTextMsg_HELP_MSG_AT, 2); EEPROMtest(); break; + case '#': +...

uECC_OPTIMIZATION_LEVEL=4 breaks uECC_sign()/uECC_verify() on atmega328p

i think (assembler) macros could fix this.

Code too big when compiled with gcc4.3.2

``` diff diff --git a/Makefile b/Makefile index 65eafb3..3eb65d7 100644 --- a/Makefile +++ b/Makefile @@ -80,7 +80,7 @@ ASRC = # Optimization level, can be [0, 1, 2, 3, s]. #...

optiboot_atmega328-Mini.hex is stale to old version

> recent versions of optiboot allow using the watchdog properly, whereas the default bootloader (in 1.8.5 at least) Really? The Optiboot WDT fix is supposed to have gone in back...

Use PINx to toggle pins.

Toggle capability is also present in SAM and SAMD

rp2040 core does not use rom floating point functions

Here's a quick benchmark of tangent (which was one of the more computationally intensive of the library functions.) Nearly 10x improvement using the ROM functions! Philhower core, variant rpipico (using...

rp2040 core does not use rom floating point functions

What? RAM-only executables can still call ROM. What does precomputation have to do with anything? The Pico SDK does floats by "wrapping" calls to the standard FP functions in short...

rp2040 core does not use rom floating point functions

Not true, at least in principle... > Qfplib-M0-full is a library of IEEE 754 single- and double-precision floating-point arithmetic routines for microcontrollers based on the ARM Cortex-M0 core (ARMv6-M architecture)....

arduino-usbserial: non-working Product string

Does an Uno work? I dumped the .hex files, and I didn't see a board-type string in either one... ``` Arduino-COMBINED-dfu-usbserial-atmega16u2-Uno-Rev3.hex: file format ihex Contents of section .sec1: : 00c0...

SAMD outputs do not provide high drive current

Has there been some sort of decision or non-decision on this? I was fiddling with max toggle speeds, and the 12MHz output waveform with "normal" drive strength is really ugly...