Arduino Mega about arduino-spi HOT 6 CLOSED

@mataide Thanks for your interest in this project. If I understand you correctly you are assuming that the library can detect if a device is present? Is that what you are looking for? The size is provided by the class constructor. There is no check that a device is present. Obviously this could be done by for instance reading and writing the first and last byte.

from arduino-spi.

Thanks Mikael, but you missunderstood what I am asking for.

I dont know if my external SRAM is working, probably not. Because with the 23LC1024 connected, your library says that I have sram.SIZE = 131072 and if I remove the 23LC1024 I still have the same amount of SRAM sram.SIZE = 131072.

So what I am trying to do is trying to make sure that the external SRAM is working.

What I need is:

I need to stream a very big JSON with a library called https://github.com/bblanchon/ArduinoJson, however the default SRAM from Arduino Mega isnt enough.

So I just bought the SRAM 23LC1024 to expand the Arduino SRAM and parse the JSON.

from arduino-spi.

@mataide To make sure that you have connected the SPI SRAM correctly you can use the benchmark sketch or read and write some bytes on the memory.

Please remember that the SPI SRAM does not automatically increase the SRAM on the MPU. That is something very different. You must write code to transfer the data from MPU SRAM to SPI SRAM.

Good luck with your project.

from arduino-spi.

@mikaelpatel Thanks,

Can you provide an example of Output in Arduino Monitor that I can have sure that my external memory is working?

Also I should use USE_SOFTWARE_SPI? Because for Mega I am using:
Software::SPI<BOARD::D51, BOARD::D50, BOARD::D52> spi;

Best Regards,

from arduino-spi.

@mataide If you run the benchmark example https://github.com/mikaelpatel/Arduino-Storage/blob/master/examples/Benchmarks/MC23LCXXX/MC23LCXXX.ino it will verify that the read/write was correct. It will also give the performance. With USE_SOFTWARE_SPI:

spi.FREQ(MHz) = 8
sram.SIZE(kbyte) = 128

write(N, us, us/byte, kbyte/s)
1, 84, 84.00, 11.90
10, 196, 19.60, 51.02
100, 1360, 13.60, 73.53
1000, 13020, 13.02, 76.80

read(N, us, us/byte, kbyte/s)
1, 84, 84.00, 11.90
10, 204, 20.40, 49.02
100, 1348, 13.48, 74.18
1000, 12840, 12.84, 77.88

And with Hardware::SPI

spi.FREQ(MHz) = 8
sram.SIZE(kbyte) = 128

write(N, us, us/byte, kbyte/s)
1, 24, 24.00, 41.67
10, 40, 4.00, 250.00
100, 168, 1.68, 595.24
1000, 1468, 1.47, 681.20

read(N, us, us/byte, kbyte/s)
1, 24, 24.00, 41.67
10, 40, 4.00, 250.00
100, 156, 1.56, 641.03
1000, 1352, 1.35, 739.64

During the read the values are checked against what was written. You get a message if that fails:
https://github.com/mikaelpatel/Arduino-Storage/blob/master/examples/Benchmarks/MC23LCXXX/MC23LCXXX.ino#L83

from arduino-spi.

@mataide I am closing this issue as it is not really a bug report or feature request.

from arduino-spi.