https://community.nxp.com/t5/MCX-Microcontrollers/MCXA346-DMA-request-with-ADC/m-p/2294244#M4659 <P>Hello&nbsp;<a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/179561">@346500452</a>&nbsp;,</P> <P>感谢在我们的社区中发帖。请检查demo中是否配置了TCDn_CSR[DREQ]。当一次 major loop 传输完成时，如果 DREQ=1，eDMA 会自动禁止该通道的后续请求，表现为把该通道的请求使能关掉（软件上等价于 ERQ 被清掉），随后才产生中断。因此若想继续下一轮采样/搬运，就需要在中断里重新把通道请求使能，也就是再次执行 EDMA_EnableChannelRequest()。</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Celeste_Liu_0-1768475960456.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/372956i65725CCCF3720E9A/image-size/medium?v=v2&amp;px=400" role="button" title="Celeste_Liu_0-1768475960456.png" alt="Celeste_Liu_0-1768475960456.png" /></span></P> <P>祝生活愉快。</P> <P>BR</P> <P>Celeste</P> <P>&nbsp;</P> <P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the "ACCEPT AS SOLUTION" button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P> Thu, 15 Jan 2026 11:21:33 GMT Celeste_Liu 2026-01-15T11:21:33Z https://community.nxp.com/t5/MCX-Microcontrollers/MCXA346-DMA-request-with-ADC/m-p/2292963#M4653 <P>你好，</P><P>&nbsp;</P><P>&nbsp; &nbsp; &nbsp; &nbsp; 在使用MCX A346 FRAm开发板进行frdmmcxa346_lpadc_edma这个例程运行的时候，有个问题不解。</P><P>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;为什么在DMA中断里面每次要重新调用<SPAN>EDMA_EnableChannelRequest这个函数，也就是CHn_CSR[ERQ]这个寄存器的值，我看了datasheet里面，也没说这个会自动清零啊？</SPAN></P><P>&nbsp;</P><P>期待回复，谢谢。</P> Wed, 14 Jan 2026 05:46:42 GMT https://community.nxp.com/t5/MCX-Microcontrollers/MCXA346-DMA-request-with-ADC/m-p/2292963#M4653 346500452 2026-01-14T05:46:42Z https://community.nxp.com/t5/MCX-Microcontrollers/MCXA346-DMA-request-with-ADC/m-p/2294244#M4659 <P>Hello&nbsp;<a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/179561">@346500452</a>&nbsp;,</P> <P>感谢在我们的社区中发帖。请检查demo中是否配置了TCDn_CSR[DREQ]。当一次 major loop 传输完成时，如果 DREQ=1，eDMA 会自动禁止该通道的后续请求，表现为把该通道的请求使能关掉（软件上等价于 ERQ 被清掉），随后才产生中断。因此若想继续下一轮采样/搬运，就需要在中断里重新把通道请求使能，也就是再次执行 EDMA_EnableChannelRequest()。</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Celeste_Liu_0-1768475960456.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/372956i65725CCCF3720E9A/image-size/medium?v=v2&amp;px=400" role="button" title="Celeste_Liu_0-1768475960456.png" alt="Celeste_Liu_0-1768475960456.png" /></span></P> <P>祝生活愉快。</P> <P>BR</P> <P>Celeste</P> <P>&nbsp;</P> <P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the "ACCEPT AS SOLUTION" button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P> Thu, 15 Jan 2026 11:21:33 GMT https://community.nxp.com/t5/MCX-Microcontrollers/MCXA346-DMA-request-with-ADC/m-p/2294244#M4659 Celeste_Liu 2026-01-15T11:21:33Z