Search found 363 matches

by shaoziyang
Tue Aug 04, 2020 1:08 am
Forum: Other Boards
Topic: USB problem on STM32F411CEU6
Replies: 6
Views: 4471

Re: USB problem on STM32F411CEU6

If crystal‘s load capacitance is not match, it will takes a long time before PLL frequencies stable, exceed DFU bootloader detect time.
by shaoziyang
Thu Jul 30, 2020 2:35 am
Forum: ESP32 boards
Topic: A replacement for _uart.wait_tx_done in esp32
Replies: 5
Views: 4302

Re: A replacement for _uart.wait_tx_done in esp32

You may use pin irq when there is no tx/rx irq function.
by shaoziyang
Thu Jul 23, 2020 12:52 am
Forum: ESP32 boards
Topic: i2c - cannot see the device.
Replies: 2
Views: 1720

Re: i2c - cannot see the device.

LSM303D is being OBSOLETE, you may use LSM303A instead.
by shaoziyang
Mon Jul 20, 2020 12:59 pm
Forum: ESP32 boards
Topic: ESP32 Virtual Timers??
Replies: 7
Views: 4733

Re: ESP32 Virtual Timers??

You may use Timer(-1), Timer(-2)... for different virtual timer. Currently that's not correct on the ESP32; virtual timers are not implemented . See Josh's PR #6258 for more details. In short there are four hardware timers and using -1 (and -2) actually maps to one of those timers due to a defect. ...
by shaoziyang
Mon Jul 20, 2020 12:58 pm
Forum: ESP32 boards
Topic: ESP32 Virtual Timers??
Replies: 7
Views: 4733

Re: ESP32 Virtual Timers??

You may use Timer(-1), Timer(-2)... for different virtual timer. Currently that's not correct on the ESP32; virtual timers are not implemented . See Josh's PR #6258 for more details. In short there are four hardware timers and using -1 (and -2) actually maps to one of those timers due to a defect. ...
by shaoziyang
Mon Jul 20, 2020 12:46 am
Forum: ESP32 boards
Topic: ESP32 Virtual Timers??
Replies: 7
Views: 4733

Re: ESP32 Virtual Timers??

You may use Timer(-1), Timer(-2)... for different virtual timer.
by shaoziyang
Sat Jul 11, 2020 1:25 am
Forum: ESP32 boards
Topic: SD Card over USB MCS
Replies: 2
Views: 1708

Re: SD Card over USB MCS

ESP32-S2 has a USB OTG, it may be use for MSC and SD card.
by shaoziyang
Mon Jul 06, 2020 1:41 am
Forum: ESP32 boards
Topic: How to transfer library to ESP32?
Replies: 5
Views: 3274

Re: How to transfer library to ESP32?

You may use webrepl or ftp transfer file through wlan, or use pyboard.py through serial port. i can't get the webrepl to connect :S i have enabled webrepl on my ESP32 :S pyboard.py also easy to use. It is in micropython/tools folder, it may use to transfer file, list file, etc. Compared with other ...
by shaoziyang
Sun Jul 05, 2020 1:34 am
Forum: ESP32 boards
Topic: How to transfer library to ESP32?
Replies: 5
Views: 3274

Re: How to transfer library to ESP32?

You may use webrepl or ftp transfer file through wlan, or use pyboard.py through serial port.
by shaoziyang
Sat Jul 04, 2020 2:14 am
Forum: Development of MicroPython
Topic: IRQ_RXIDLE in UART?
Replies: 1
Views: 1536

Re: IRQ_RXIDLE in UART?

UART receive callback is not perfect now, it is works, but not stable. You may try my irqUART for UART receive.

viewtopic.php?f=15&t=8579
https://github.com/micropython-Chinese- ... sc/irqUART