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1. 

   gulu2065
   Member

   I want to test a chip and I was using SPI and USB serial to send data to the computer.
   However, as the USB serial speed is limited and it will overflow.
   How could I interface it with a SD card or some other kind of memory and store data in it? and Then I read data and send to PC.
   I need to store at least 16224 bits data.

   Posted 4 years ago #
2. 

   gulu2065
   Member

   Or, does anyone know, if i use usart, how fast would that be? will it enough?

   Posted 4 years ago #
3. 

   gulu2065
   Member

   I see that on RM008, the SDIO do not have SPI compatible communication mode
   Does that means I can't use it, or I could use it through DMA?

   Posted 4 years ago #
4. 

   gbulmer
   Moderator

   One USART is upto 4.5Mbit/second, so, say 450KByte/second. I think the other two are 2.25Mbit/second.

   (full disclosure: I am not a member of LeafLabs staff)

   Posted 4 years ago #
5. 

   gulu2065
   Member

   gbulmer,
   Thanks a lot!
   I see this here
   http://leaflabs.com/docs/lang/api/serial.html#lang-serial
   Unlike the Arduino, none of the Maple’s serial ports is connected to the USB port on the Maple board. If you want to communicate using the built-in USB port, use SerialUSB instead. You will need an additional USB-to-serial adapter to communicate between a USART and your computer.

   Does this means, I can't use serial without another adapter?

   Posted 4 years ago #
6. 

   gbulmer
   Moderator

   Does this means, I can't use serial without another adapter?

   You're right, it can't use the serial for communication, unless you have a computer which has a serial interface.

   Posted 4 years ago #
7. 

   mikep
   Member

   If you want to connect the Maple's USART1/2 to a computer via USB and not use the Maple's SerialUSB functionality, you'd need a "USB -> Serial TTL" adapter, something like this:

   http://shop.moderndevice.com/products/bub_ii
   or this:
   http://www.sparkfun.com/products/718

   Just make sure that the adapter supports 3.3V logic level.

   Posted 4 years ago #

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