Very impressive! Thanks for sharing this.
1k FFT (SP) in ~0.8ms on PYBD, not bad.
Search found 135 matches
- Fri Sep 27, 2019 11:13 am
- Forum: Development of MicroPython
- Topic: ulab, or what you will - numpy on bare metal
- Replies: 108
- Views: 91224
- Mon Sep 23, 2019 8:21 am
- Forum: Drivers for External Components
- Topic: LCD160CR with Pycom boards
- Replies: 9
- Views: 5754
Re: LCD160CR with Pycom boards
LCD160CR uses SPI only for high speed bulk transfer of raw pixel data.
- Fri Sep 13, 2019 10:35 am
- Forum: Pyboard D-series
- Topic: Firmware for PyBoard D
- Replies: 4
- Views: 3043
Re: Firmware for PyBoard D
Re: LCD160CR_1.1 screen update Theoretical limit for full screen updates using SPI fast protocol is 97 Hz. This requires a 32 MHz SPI clock. Smaller rectangular areas can be processed even faster. However, this technique requires a full frame buffer in host MCU RAM. (Original LCD160CR has a max. SPI...
- Wed Sep 11, 2019 5:25 pm
- Forum: Pyboard D-series
- Topic: Replacement USB fuse
- Replies: 3
- Views: 2545
Re: Replacement USB fuse
You may replace the fuse with an SMD resistor < 0.1 Ohm. Of course there is no more protection but the board works fine. If I remember correctly, recent PYBD boards don't have a fuse installed. Any well designed USB host port should have built in over current protection. As it tuned out that many US...
- Sat Jun 22, 2019 7:20 am
- Forum: Pyboard D-series
- Topic: WBUS-EMMC how to tell if it's present
- Replies: 10
- Views: 8154
Re: WBUS-EMMC how to tell if it's present
Where to start.. :) Most important (for MCU applications) there is no need for flaky connectors. But there are more: - extended temperature range - much more configuration options - trade in space for reliability (SLC emulation) - power efficiency - space requirements - better sourcing (who knows wh...
- Fri Jun 21, 2019 5:19 pm
- Forum: Pyboard D-series
- Topic: WBUS-EMMC how to tell if it's present
- Replies: 10
- Views: 8154
Re: WBUS-EMMC how to tell if it's present
Wouldn't the usual way be to just try mounting and evaluate except? EMMC is definitely not a hot-plug device.
- Mon Jun 17, 2019 5:58 pm
- Forum: Pyboard D-series
- Topic: Using Timers on Pyboard 'D'.
- Replies: 5
- Views: 4054
Re: Using Timers on Pyboard 'D'.
I didn't check in detail, but it looks like the callback method runs inside the interrupt service routine. This should be avoided because of several restrictions that apply to IRQ handlers. One of these restrictions is a locked heap within IRQ handlers. To circumvent this, the IRQ service routine ma...
- Thu May 23, 2019 8:32 am
- Forum: Other Boards
- Topic: [Any STM32 board] How much time this loop should take ?
- Replies: 14
- Views: 8416
Re: [Any STM32 board] How much time this loop should take ?
The loop of the asm example takes 4 cycles.
This will result in 4e7 cycles (with 10e7 passes).
At 84 MHz I would expect ~476 ms.
This will result in 4e7 cycles (with 10e7 passes).
At 84 MHz I would expect ~476 ms.
- Wed May 22, 2019 7:57 pm
- Forum: Pyboard D-series
- Topic: i2c woe on pyboard d
- Replies: 9
- Views: 6709
Re: i2c woe on pyboard d
I'm pretty sure there are 4 I2C interfaces on the F767! However, only two of them might be assigned to X & Y interfaces within of-the-shelf MPY binaries. I rarely use the default binaries and I have to admit that we are using our own board configurations where we define all the required interfaces a...
- Fri May 17, 2019 8:15 pm
- Forum: Pyboard D-series
- Topic: i2c woe on pyboard d
- Replies: 9
- Views: 6709
Re: i2c woe on pyboard d
Hi Nicholas, agreed that the pyb/machine duality is sometimes pretty confusing. But there are good reasons to have them both. In short, pyb is only valid for stm32 MCUs, whereas machine tries to be manufacturer agnostic. Regarding I2C this means that the driver has to cover many different architectu...