i.MX ProcessorsのトピックRe: IMX7D - Cortex M4 - GPIO-SPEED https://community.nxp.com/t5/i-MX-Processors/IMX7D-Cortex-M4-GPIO-SPEED/m-p/811295#M125115 <HTML><HEAD></HEAD><BODY><P>The GPIO module switching timings you observe are the realistic ones since these numbers include some software overhead, GPIO inter-module transfer timings etc.</P><P></P><P>You can try to increase the IPG_CLK_ROOT frequency on your own risk, however, it may cause the whole system to hang up.</P><P><BR />Have a great day,<BR />Artur</P></BODY></HTML> Wed, 26 Dec 2018 10:43:21 GMT art 2018-12-26T10:43:21Z IMX7D - Cortex M4 - GPIO-SPEED https://community.nxp.com/t5/i-MX-Processors/IMX7D-Cortex-M4-GPIO-SPEED/m-p/811294#M125114 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>At this time I'm trying to determine how fast the CortexM4 can / will handle GPIO reads/writes.</P><P></P><P>A very simple IO-TOGGLE running on Bare-Metal (native) Cortex-M4.. shows me that it takes up-to +400ns to toggle an GPIO pin.&nbsp; ( a high low / low high sequence ( square wave) takes +800ns ).</P><P></P><P>I see similar 'speeds' for reading ( iso writing) an GPIO pin !&nbsp;</P><P></P><P></P><P>Is there any possibility to improve ( speed this up) ?</P><P></P><P><SPAN style="color: #51626f; background-color: #ffffff;">From the reference manual&nbsp;I see that the peripheral clock is running at 24MHz, so I would expect this to be faster ?</SPAN></P><P></P><P><SPAN style="color: #51626f; background-color: #ffffff;">Worst case scenario ?<SPAN>&nbsp;Can I increase the peripheral clock speed , without breaking either Linux or FreeRTOS.</SPAN></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"></SPAN></P><P></P><P>Thanks,&nbsp;</P><P>Noel</P><P></P><P><SPAN style="color: #51626f; background-color: #ffffff;"></SPAN></P><P><SPAN style="color: #51626f; background-color: #ffffff;"></SPAN></P><P></P></BODY></HTML> Wed, 19 Dec 2018 07:10:09 GMT https://community.nxp.com/t5/i-MX-Processors/IMX7D-Cortex-M4-GPIO-SPEED/m-p/811294#M125114 Noel_V 2018-12-19T07:10:09Z Re: IMX7D - Cortex M4 - GPIO-SPEED https://community.nxp.com/t5/i-MX-Processors/IMX7D-Cortex-M4-GPIO-SPEED/m-p/811295#M125115 <HTML><HEAD></HEAD><BODY><P>The GPIO module switching timings you observe are the realistic ones since these numbers include some software overhead, GPIO inter-module transfer timings etc.</P><P></P><P>You can try to increase the IPG_CLK_ROOT frequency on your own risk, however, it may cause the whole system to hang up.</P><P><BR />Have a great day,<BR />Artur</P></BODY></HTML> Wed, 26 Dec 2018 10:43:21 GMT https://community.nxp.com/t5/i-MX-Processors/IMX7D-Cortex-M4-GPIO-SPEED/m-p/811295#M125115 art 2018-12-26T10:43:21Z