topic Re: Using DMA how to Transfer ADC value to PWM channel? in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/Using-DMA-how-to-Transfer-ADC-value-to-PWM-channel/m-p/309455#M13269 <HTML><HEAD></HEAD><BODY><P>From you description, when there add DMA transfer, the application could not run.</P><P>We need to check DMA TCD setting if correct, it use DMA minor loop to transfer 2 bytes data from ADC result register to FTM CnV register and the Major loop is 0x80.</P><P>Please set a breakpoint after code run over da = DMA1_Init(NULL); and check DMA registers value.</P><P>Please check if TCDn_NBYTES is 0x2 and TCDn_CITER eqaual with TCDn_BITER value to 0x80.</P><P>You also could check after ADC start work and DMA CITER register value if modified or not.</P><P></P><P>Please pay attention that for FTM CnV register update isn't immedicately when new value write into CnV register.</P><P>When CLKS[1:0] ≠ 0:0 and 0:0, and FTMEN = 0,&nbsp; If the selected mode is EPWM, then CnV register is updated after CnV register was written and the FTM counter changes from MOD to CNTIN.</P><P><BR />Have a great day,<BR />Ma Hui</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Thu, 08 May 2014 04:01:50 GMT Hui_Ma 2014-05-08T04:01:50Z Using DMA how to Transfer ADC value to PWM channel? https://community.nxp.com/t5/Kinetis-Microcontrollers/Using-DMA-how-to-Transfer-ADC-value-to-PWM-channel/m-p/309454#M13268 <HTML><HEAD></HEAD><BODY><P>Hi</P><P>I am using FRDM-K20D50M board with codewarrior10.5. I am using PE to generate code. I have written the following code but it is not working. According to me I think there is some minor error which I am not able to find out. I have gone through the app note <STRONG>AN4631. In</STRONG> FRDM board I have connected a potentiometer at <STRONG>ADC0_DM0</STRONG> and by default the Green LED is connected to&nbsp; <STRONG>PTD4 FTM0 CH4</STRONG> . On rotating the potentiometer, the voltage changes from 0 to 3.3v. In the code works fine when not using DMA. Please look into the matter</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Kind Regards</P><P>Amit Kumar</P><P><STRONG>Original Attachment has been moved to: <A _jive_internal="true" href="https://community.nxp.com/docs/DOC-337442">FRDM-K20-DMA-RGB.zip</A></STRONG></P></BODY></HTML> Sat, 03 May 2014 12:41:00 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Using-DMA-how-to-Transfer-ADC-value-to-PWM-channel/m-p/309454#M13268 Amit_Kumar1 2014-05-03T12:41:00Z Re: Using DMA how to Transfer ADC value to PWM channel? https://community.nxp.com/t5/Kinetis-Microcontrollers/Using-DMA-how-to-Transfer-ADC-value-to-PWM-channel/m-p/309455#M13269 <HTML><HEAD></HEAD><BODY><P>From you description, when there add DMA transfer, the application could not run.</P><P>We need to check DMA TCD setting if correct, it use DMA minor loop to transfer 2 bytes data from ADC result register to FTM CnV register and the Major loop is 0x80.</P><P>Please set a breakpoint after code run over da = DMA1_Init(NULL); and check DMA registers value.</P><P>Please check if TCDn_NBYTES is 0x2 and TCDn_CITER eqaual with TCDn_BITER value to 0x80.</P><P>You also could check after ADC start work and DMA CITER register value if modified or not.</P><P></P><P>Please pay attention that for FTM CnV register update isn't immedicately when new value write into CnV register.</P><P>When CLKS[1:0] ≠ 0:0 and 0:0, and FTMEN = 0,&nbsp; If the selected mode is EPWM, then CnV register is updated after CnV register was written and the FTM counter changes from MOD to CNTIN.</P><P><BR />Have a great day,<BR />Ma Hui</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Thu, 08 May 2014 04:01:50 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Using-DMA-how-to-Transfer-ADC-value-to-PWM-channel/m-p/309455#M13269 Hui_Ma 2014-05-08T04:01:50Z