Search found 4 matches

by RussBarr
Tue Jul 11, 2017 12:15 am
Forum: ESP32 Arduino
Topic: disabling interrupts in ESP32 Ardunio
Replies: 3
Views: 11035

disabling interrupts in ESP32 Ardunio

I am trying to use Neopixels on the ESP32. I need to lock out all interrupts during the high period too insure accurate timing. It look like the Ardunio function nointerrupts does not work. I have tried to use different methods to do this but have ran into issues or they did nothing noInterrupts(); ...
by RussBarr
Wed Mar 15, 2017 5:29 pm
Forum: General Discussion
Topic: How can I use external flash and sram at the same time on SPI
Replies: 0
Views: 2894

How can I use external flash and sram at the same time on SPI

I would like to add an external SPI SRAM but I still need the external SPI FLASH
I under stand they map to different address but are there different SPI chip select for SRAM and FLASH?
Is there a single SPI memory that has large SRAM and FLASH? If so how would you map the address?
by RussBarr
Wed Feb 01, 2017 1:48 am
Forum: Report Bugs
Topic: Unexpectedly low floating-point performance in C
Replies: 24
Views: 139581

Re: Unexpectedly low floating-point performance in C

For a $6.50 part with all the I/O and WIFI and BT and a crappy FP unit I can not complain :lol:
by RussBarr
Fri Jan 13, 2017 10:50 pm
Forum: Report Bugs
Topic: Unexpectedly low floating-point performance in C
Replies: 24
Views: 139581

Re: Unexpectedly low floating-point performance in C

There are several things to be considered on the floating point test. 1. The ESP runs out of FLASH + 64K of CACHED RAM. The RAM runs at full speed. The FLASH is clocked at 80MHz and is running in DUAL mode (2 bits per clock cycle) 200ns for a 32 bit word and 150ns for a 24bit word. The ESP32 has bot...