https://devzone.nordicsemi.com/f/nordic-q-a/27973/ppi-with-softdeviceHi everyone: I use nrf_drv_ppi_channel_alloc(&amp;m_ppi_channel1) to allocate ppi channel. Every time i call nrf_drv_ppi_channel_alloc(&amp;m_ppi_channel1), the m_ppi_channel1 will increase. when m_ppi_channel1 &gt; 16 will return error. How to release ppi channelen-USTelligent Community 13Fri, 08 Dec 2017 08:34:27 GMThttps://devzone.nordicsemi.com/thread/110367?ContentTypeID=1Fri, 08 Dec 2017 08:34:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9607ce69-f8cc-41d3-be9f-ecbabcd1550aMartinBL<p>There is a function called channel_allocated_clr_all() inside nrf_drv_ppi_uninit() which is supposed to clear all channels. How is it not working for you? What happens?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/110366?ContentTypeID=1Thu, 07 Dec 2017 16:06:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c36fdfa1-3d98-4e53-bb42-fc7e6f1dfc5cletter57<p>Hi Martin :<br /> Using nrf_drv_ppi_channel_free() to release PPI Channel，it works fine. Another question, if i use nrf_drv_ppi_uninit() instead of nrf_drv_ppi_channel_free(), will it release ppi channel? I have tried it and it looks unworkable.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/110365?ContentTypeID=1Thu, 07 Dec 2017 13:41:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0443e5db-f044-438c-bacd-72ffaf96c743MartinBL<p>Hi,</p> <p>Have you looked at <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v14.2.0/group__nrf__drv__ppi.html#ga901e6e7a9f2e5ca98bafd784d2713f87">nrf_drv_ppi_channel_free()</a>?</p><div style="clear:both;"></div>