nrf_drv_ppi_channel_alloc returns code 0x4 NRF_ERROR_NO_MEM on nRF51822 but not on Dev Kit&#39;s nRF51422https://devzone.nordicsemi.com/f/nordic-q-a/34811/nrf_drv_ppi_channel_alloc-returns-code-0x4-nrf_error_no_mem-on-nrf51822-but-not-on-dev-kit-s-nrf51422Hi! I recently got my project working on an nRF51 DK, and am now trying to get the project working on an nRF51822 on our PCB. Our application uses Bluetooth, an LED, a button, and a PWM output. I am using the app_pwm library to create a PWM signal.en-USTelligent Community 13Sun, 03 Jun 2018 21:37:37 GMTRE: nrf_drv_ppi_channel_alloc returns code 0x4 NRF_ERROR_NO_MEM on nRF51822 but not on Dev Kit's nRF51422https://devzone.nordicsemi.com/thread/134440?ContentTypeID=1Sun, 03 Jun 2018 21:37:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fc56b5c0-1f0f-49b0-8808-06529aa2ec03Jonathan Hale<p>Great, it worked! For some reason I misinterpreted the error to mean there weren&#39;t enough of the mysterious PPI channels, but really it just meant there wasn&#39;t enough memory. I simply went to Options for Target &gt; Target and added 0x1000 to IRAM1 Size, and the PWM library initialized without error. Thank you!&nbsp;</p><div style="clear:both;"></div>RE: nrf_drv_ppi_channel_alloc returns code 0x4 NRF_ERROR_NO_MEM on nRF51822 but not on Dev Kit's nRF51422https://devzone.nordicsemi.com/thread/133975?ContentTypeID=1Wed, 30 May 2018 08:37:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c6ec30c0-9b4e-477b-abb0-42ccc64e4605Bj&#248;rn Kvaale<p>I think the issue might be like pointed out in the PWM library: &quot;there were not enough free resources&quot; (<a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk51.v9.0.0/group__app__pwm.html?cp=4_0_11_6_7_10">see link</a>). Have you tried <a href="https://devzone.nordicsemi.com/f/nordic-q-a/19637/softdevice_enable-nrf_error_no_mem-0x4">changing the ram settings</a>? The nrf51822 should definitely be able to handle bluetooth, a button, an LED &amp; a PWM pin.</p><div style="clear:both;"></div>RE: nrf_dr_ppi_channel_alloc returns code 0x4 NRF_ERROR_NO_MEM on nRF51822 but not on Dev Kit's nRF51422https://devzone.nordicsemi.com/thread/133869?ContentTypeID=1Tue, 29 May 2018 14:37:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a4ca1a3a-bb7b-49a0-8a4b-5e3279c196a6Jonathan Hale<p>I am using SDK 12.3.0 and SoftDevice S130</p><div style="clear:both;"></div>RE: nrf_dr_ppi_channel_alloc returns code 0x4 NRF_ERROR_NO_MEM on nRF51822 but not on Dev Kit's nRF51422https://devzone.nordicsemi.com/thread/133727?ContentTypeID=1Tue, 29 May 2018 06:01:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5db4e5b8-95d4-4f26-9e7e-45302cd60ffaBj&#248;rn Kvaale<p>Which SDK version &amp; which softdevice version are you currently using?</p><div style="clear:both;"></div>