DMA SPI on cc3200 Launchpad

Salman Ahmed87

Other Parts Discussed in Thread: CC3200

Hello,

I'm using a STM32 nucleo board (master) connected to the cc3200 launchpad (slave) over the spi interface.When running the default spi_demo example,if i send a string from master such as "SPI1 Communication Working from STM32F401 Nucleo Board " , I only receive "SPI1 Communiation Workin oT21coad".

On the master side if I add a delay of ,say 1ms before sending each character then cc3200 is able to display the full string.

I tried the DMA solution for SPI Slave provided on this link -> http://e2e.ti.com/support/wireless_connectivity/f/968/t/353790 but then I get no data at all on the receiving side.

Any help would be appreciated

Regards,
Salman

over 10 years ago

0 Praveen Kumar N over 10 years ago

TI__Expert 6700 points

Hi Salman,

What is the SPI interface speed you have kept at the master (STM32). Can you try reducing this ?

Thanks ans Regards,
Praveen

0 Salman Ahmed87 over 10 years ago in reply to Praveen Kumar N

Prodigy 75 points

Hi Praveen,

I tried the slowest possible clock rate from the stm32 but faced the same problem.The update is that I actually get all the data correctly and am able to save it in an array and can view it using the expression window in CCS(tried upto 10Mhz). Seems directly printing the data on the screen was an issue.

Regards,
Salman

0 Praveen Kumar N over 10 years ago in reply to Salman Ahmed87

TI__Expert 6700 points

Hi Salman,

If you are using CPU to service the SPI slave and push the data over UART, the CPU will not get time to read from slave RX register and the data might get missed.

Thanks and Regards,
Praveen

Wi-Fi

Wi-Fi forum

DMA SPI on cc3200 Launchpad