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Yuzzie

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Posts posted by Yuzzie

    SPI DMA receive when CC3200MOD acts as SPI slave

    in Energia - TivaC/CC3XXX

    Posted

    Hi,

    I'm implementing an application for CC3200MOD in Energia 1.6.10E18 environment in which host MCU (Atmel AT76C114) sends jpeg image data (size varies from 1MB to 3MB) over SPI to CC3200MOD which then sends it over WiFi to PC. So Atmel acts as SPI master and CC3200MOD SPI slave.

    The bottleneck is SPI receive rate in CC3200MOD end. I need to configure host MCU SPI clock to 10.5MHz in order to receive correct data on CC3200MOD. With higher clock rate the data gets corrupted. When receiving valid data the transfer rate is 0.17 MBps. This is way too low for our purposes.

    I have understood that by using SPI DMA one could receive higher transfer rate. Are there any SPI DMA examples available for SPI slave receive in Energia environment? Does SPI DMA work on SPI slave when SPI master sends data continuously or does it require changes also for the sending procedure from SPI master?

    Thanks,
    Yuzzie

    Sending JPEG data to CC3200 via SPI and transferring it to server

    in Energia - TivaC/CC3XXX

    Posted

    Hi!

     

    I received CC3200 launchpad a while ago and have been playing with it for some time trying out different examples.

     

    Now I should start the real work with CC3200 implementing the following scenario:

    - CC3200 connects to a cloud server using e.g. HTTPS authentication

    - An jpg image is captured on camera module that is connected to host MCU (Atmel AT76C114).

    - The image data (file size 500kB-1MB) is transferred from the host MCU to CC3200 via SPI (so CC3200 acts as SPI slave)

    - As CC3200 receives the SPI buffers it sends the data over to the server with e.g. HTTP Post

     

    Can anyone comment if the above workflow is feasible with CC3200?

     

    At the moment Atmel MCU has not been connected to CC3200 so I'm emulating the host MCU behaviour with another CC3200 launchpad.

    I have evaluated SPI functionality (http://processors.wiki.ti.com/index.php/CC32xx_SPI_Demo)and HTTPS connection (http://forum.43oh.com/topic/5883-cc3200-ssl/) but I have problems figuring out how to implement the whole chain (host MCU image data->SPI->CC3200 image data transfer to server).

     

    Would anyone happen to have examples for passing jpg data through SPI and transferring jpg image to server?

     

    Thanks!

     

     

     

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