Search found 1122 matches

by Pito
Tue Jun 27, 2017 6:26 am
Forum: Projects
Topic: OV7670, Generic STM32F103RC and ILI9341 display
Replies: 97
Views: 6659

Re: OV7670, Generic STM32F103RC and ILI9341 display

So you already overclock :) Thus running the BP at 128MHz cannot be a challenge for you :)
I think for playing with video and your intention to make some image processing the Black F407ZET plus 512-1024kB external sram is a minimum. F407 even possess the DCMI..
by Pito
Tue Jun 27, 2017 5:51 am
Forum: Projects
Topic: OV7670, Generic STM32F103RC and ILI9341 display
Replies: 97
Views: 6659

Re: OV7670, Generic STM32F103RC and ILI9341 display

Btw the Ili9341 datasheet says the "write" SPI clock shall be 10MHz max..
https://cdn-shop.adafruit.com/datasheets/ILI9341.pdf
by Pito
Mon Jun 26, 2017 4:17 pm
Forum: General discussion
Topic: SD card on ILI9341 display board??
Replies: 19
Views: 268

Re: SD card on ILI9341 display board??

SDcard's SPI signal path resistors - they usually put there 1k resistors to avoid excessive currents when connecting Sdcard to 5V logic (poor man's level shifter), but I would not short them, better do what I do just now :) -> replace those 1k resistors with 22-47ohm resistors in all 4 SPI Sdcard si...
by Pito
Mon Jun 26, 2017 6:47 am
Forum: General discussion
Topic: does stm32f1 gets too hot in a project box? and temperature sensor
Replies: 6
Views: 121

Re: does stm32f1 gets too hot in a project box? and temperature sensor

The power dissipated off the MCU package is P = I * U in [Watt], where the current I in Amperes depends on the MCU clock frequency, number of peripherals on, and gpio's average current load, U in Volts is the Vcc. For example assuming the I = 35mA and U = 3.3V the P = 0.035 * 3.3 = 115.5mW. The temp...
by Pito
Sun Jun 25, 2017 6:13 pm
Forum: STM32generic
Topic: [STM32GENERIC] Latest - issues
Replies: 11
Views: 247

Re: [STM32GENERIC] Latest - issues

Btw, I think the GPIO speed setting was set to "MEDIUM" due to Pito's recommendation for F4 SDIO to work. Trust, but verify :) Here with VERY_HIGH gpio speed at SPI 36MHz, Samsung: Use a freshly formatted SD for best performance.. ************************************************* Opening the read f...
by Pito
Sun Jun 25, 2017 2:29 pm
Forum: General discussion
Topic: Should we still use optimisation level -Os (Small)
Replies: 15
Views: 201

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

Do overclock - 100MHz might solve your problems :)
by Pito
Sun Jun 25, 2017 12:16 pm
Forum: STM32generic
Topic: [STM32GENERIC] Latest - issues
Replies: 11
Views: 247

Re: [STM32GENERIC] Latest - issues

This is the Sandisk at 18MHz SPI (36MHz SPI with the error as above) in the bench: File size 5 MB Buffer size 512 bytes Starting write test, please wait. write speed and latency speed,max,min,avg KB/Sec,usec,usec,usec 1946.16,24128,254,261 1964.51,11305,254,258 1926.66,36394,254,263 Starting read te...
by Pito
Sun Jun 25, 2017 11:35 am
Forum: STM32generic
Topic: [STM32GENERIC] Latest - issues
Replies: 11
Views: 247

Re: [STM32GENERIC] Latest - issues

And how is performing with a 102400kB file? F103ZET, 72MHz, 18MHz SPI, flash ws=2, Buffersize = 32kB, SdFatEX, 104.4MB file, Samsung EVO CL10 Use a freshly formatted SD for best performance.. ************************************************* Opening the read file.. Opening the write file.. Reading ...