topic Re: How to send the same value repeated times using SPI and DMA in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/How-to-send-the-same-value-repeated-times-using-SPI-and-DMA/m-p/886243#M52448 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>please refer to the demo in FRDM-K64F\boards\frdmk64f\driver_examples\edma\scatter_gather. It use TCD.</P><P></P><P>Regards</P><P>Jing</P></BODY></HTML> Mon, 25 Feb 2019 07:14:31 GMT jingpan 2019-02-25T07:14:31Z How to send the same value repeated times using SPI and DMA https://community.nxp.com/t5/Kinetis-Microcontrollers/How-to-send-the-same-value-repeated-times-using-SPI-and-DMA/m-p/886242#M52447 <HTML><HEAD></HEAD><BODY><P>Hi everyone!</P><P></P><P>I am using Kinetis K64 and it's SDK. I need to send a value (16 bit in this case) repeated times (N) using SPI and DMA. Creating a buffer of N and filling it with the value and then using the "DSPI_MasterTransferEDMA" API would work, but I want to avoid it (creating the buffer).</P><P>&nbsp;</P><P>I know that setting the correct values in the TCD of DMA it is possible to copy N times the same value (using a -2 minor loop offset for example), but I can't find the way to access the TCD using the SPI DMA driver (fsl_dspi_edma).&nbsp;</P><P></P><P>Is there a straightforward way of doing this sticking to the transactional api mechanism?</P><P>&nbsp;</P><P>Thank you very much!</P><P></P><P>Tobías</P></BODY></HTML> Sun, 24 Feb 2019 20:47:15 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/How-to-send-the-same-value-repeated-times-using-SPI-and-DMA/m-p/886242#M52447 tlifschitz 2019-02-24T20:47:15Z Re: How to send the same value repeated times using SPI and DMA https://community.nxp.com/t5/Kinetis-Microcontrollers/How-to-send-the-same-value-repeated-times-using-SPI-and-DMA/m-p/886243#M52448 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>please refer to the demo in FRDM-K64F\boards\frdmk64f\driver_examples\edma\scatter_gather. It use TCD.</P><P></P><P>Regards</P><P>Jing</P></BODY></HTML> Mon, 25 Feb 2019 07:14:31 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/How-to-send-the-same-value-repeated-times-using-SPI-and-DMA/m-p/886243#M52448 jingpan 2019-02-25T07:14:31Z