topic lpc11e68 SPI effective rate in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/lpc11e68-SPI-effective-rate/m-p/814342#M32659 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I'm using LPC11e68 system clock is set to 48MHz and&nbsp;SSP0 configured as SPI master @ 12MHz.</P><P>it seems like effective baud rate is much lower - DMA is not in used and from the analysis i made it seems like reads/writes to SSP0 DR registers stalls.</P><P></P><P>did anyone experience any similar performance issues with SPI?</P><P></P><P>i will appreciate any input.</P></BODY></HTML> Thu, 02 Aug 2018 18:14:27 GMT eranrai 2018-08-02T18:14:27Z lpc11e68 SPI effective rate https://community.nxp.com/t5/LPC-Microcontrollers/lpc11e68-SPI-effective-rate/m-p/814342#M32659 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I'm using LPC11e68 system clock is set to 48MHz and&nbsp;SSP0 configured as SPI master @ 12MHz.</P><P>it seems like effective baud rate is much lower - DMA is not in used and from the analysis i made it seems like reads/writes to SSP0 DR registers stalls.</P><P></P><P>did anyone experience any similar performance issues with SPI?</P><P></P><P>i will appreciate any input.</P></BODY></HTML> Thu, 02 Aug 2018 18:14:27 GMT https://community.nxp.com/t5/LPC-Microcontrollers/lpc11e68-SPI-effective-rate/m-p/814342#M32659 eranrai 2018-08-02T18:14:27Z Re: lpc11e68 SPI effective rate https://community.nxp.com/t5/LPC-Microcontrollers/lpc11e68-SPI-effective-rate/m-p/814343#M32660 <HTML><HEAD></HEAD><BODY><P>If your SPI is set to 1/4 the CPU speed, you've only got 32 cycles for each byte. That's not much time for the CPU to do too much.</P></BODY></HTML> Thu, 02 Aug 2018 20:45:32 GMT https://community.nxp.com/t5/LPC-Microcontrollers/lpc11e68-SPI-effective-rate/m-p/814343#M32660 chrispflieger 2018-08-02T20:45:32Z