Search found 5939 matches

by RogerClark
Sun Jun 25, 2017 9:33 pm
Forum: General discussion
Topic: Should we still use optimisation level -Os (Small)
Replies: 11
Views: 126

Re: Should we still use optimisation level -Os (Small)

There are still NOPs when it samples the pixels from the camera, but not when sending to the display. AFIK, the clock to the camera is normally 8MHZ ( the spec says the minimum is 10MHz but I think everyone uses 8 MHz as its easier) I am not sure if the clock from the camera, changes depending on fr...
by RogerClark
Sun Jun 25, 2017 8:56 pm
Forum: General discussion
Topic: Should we still use optimisation level -Os (Small)
Replies: 11
Views: 126

Re: Should we still use optimisation level -Os (Small)

Do overclock - 100MHz might solve your problems :) Thats an interesting option.. Interrupts already need to be disabled in this code so that the pixels get clocked in correctly, so I could overclock. Also, if I can push the ILI9341 SPI faster it would help. I think QVGA should be possible at 7 FPS ...
by RogerClark
Sun Jun 25, 2017 8:50 pm
Forum: Projects
Topic: OV7670, Generic STM32F103RC and ILI9341 display
Replies: 74
Views: 6327

Re: OV7670, Generic STM32F103RC and ILI9341 display

AFIK pin PB10 has nothing to do with USB. On the BP this is just a GPIO pin, not connected to anything. So for boards without extra usb hardware, this pin should not be set to OUTPUT during the USB enable function. But I think perhaps on boards like the BP, so other code may be needed in USB enable(...
by RogerClark
Sun Jun 25, 2017 10:43 am
Forum: General discussion
Topic: Combining Blink & Count to the bootloader
Replies: 33
Views: 338

Re: Combining Blink & Count to the bootloader

thus far i'm quite happy with just the 'raw' bootloader, in fact after i installed the bootloader i deliberately zero out blocks of flash after 0x8002000 if i remember correctly, this leaves it in 'perpetual' boot loader mode waiting for sketch install either way the 'perpetual mode' keeps the led ...
by RogerClark
Sun Jun 25, 2017 10:40 am
Forum: General discussion
Topic: SD card on ILI9341 display board??
Replies: 15
Views: 176

Re: SD card on ILI9341 display board??

I have several boards, I'll see if any are different or if they all have the SD resistors
by RogerClark
Sun Jun 25, 2017 10:39 am
Forum: General discussion
Topic: Should we still use optimisation level -Os (Small)
Replies: 11
Views: 126

Re: Should we still use optimisation level -Os (Small)

OK

I'll leave it as -Os, but I'll need to work out why the camera code runs slow and won't work in -Os optimisation :-(
by RogerClark
Sun Jun 25, 2017 10:22 am
Forum: STM Core
Topic: Using Scheduler Library
Replies: 9
Views: 111

Re: Using Scheduler Library

Scheduler already works with libmaple (and all STM32 cores) as is. Rick's point is only for Cortex M0 chips that need different code path. Umm. Rick wrote You can make this library work with the stm32 chips with a few simple changes. I did not check if it worked already, as it seemed Rick was sayin...
by RogerClark
Sun Jun 25, 2017 10:01 am
Forum: General discussion
Topic: Partial / old code for a F4 Maple bootloader
Replies: 33
Views: 635

Re: Partial / old code for a F4 Maple bootloader

Yes. Its supposed to turn a F4 board into a BMP. (according to the guys on gitter) I looked at the makefile and it does build for cortex m4 so it does look like it should target the F4 But, I tried building my own binary but it didnt seem to work on either my F4 Discovery board or my generic F407 bo...
by RogerClark
Sun Jun 25, 2017 7:14 am
Forum: General discussion
Topic: Should we still use optimisation level -Os (Small)
Replies: 11
Views: 126

Re: Should we still use optimisation level -Os (Small)

danieleff wrote:
Sun Jun 25, 2017 6:25 am
One more thing you can check: GNU ARM embedded 6-2017-q1
It can give you speed boost without changing to -O2
Thanks.
Thats interesting.
by RogerClark
Sun Jun 25, 2017 3:35 am
Forum: General discussion
Topic: Partial / old code for a F4 Maple bootloader
Replies: 33
Views: 635

Re: Partial / old code for a F4 Maple bootloader

I had another thought about where we can get a F4 DFU bootloader, and it seems that the BlackMagic probe used to have a F4 version of their DFU bootloader, but it was removed in this commit https://github.com/blacksphere/blackmagic/commit/ad151fdca83aa2ea4dfd4f77a27507c9fc53f5d6 If I get time I'll t...