RE: Two saadc channels get switched if callback takes too long

mtfurlan_t — Fri, 21 Jun 2019 14:11:48 GMT

Yep, that is the issue.

I got it working from comments in that thread.

Thank you.

Working diff:

diff --git a/examples/peripheral/saadc/main.c b/examples/peripheral/saadc/main.c
index 8c956541..d80e9731 100644
--- a/examples/peripheral/saadc/main.c
+++ b/examples/peripheral/saadc/main.c
@@ -72,6 +72,7 @@ volatile uint8_t state = 1;
 static const nrf_drv_timer_t m_timer = NRF_DRV_TIMER_INSTANCE(0);
 static nrf_saadc_value_t     m_buffer_pool[2][SAMPLES_IN_BUFFER];
 static nrf_ppi_channel_t     m_ppi_channel;
+static nrf_ppi_channel_t     m_ppi_channel0;
 static uint32_t              m_adc_evt_counter;
 
 
@@ -110,17 +111,27 @@ void saadc_sampling_event_init(void)
     err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel);
     APP_ERROR_CHECK(err_code);
 
+    err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel0);
+    APP_ERROR_CHECK(err_code);
+
     err_code = nrf_drv_ppi_channel_assign(m_ppi_channel,
                                           timer_compare_event_addr,
                                           saadc_sample_task_addr);
     APP_ERROR_CHECK(err_code);
+
+    err_code = nrf_drv_ppi_channel_assign(m_ppi_channel0,
+            nrf_saadc_event_address_get(NRF_SAADC_EVENT_END),
+            nrf_saadc_task_address_get(NRF_SAADC_TASK_START));
+    APP_ERROR_CHECK(err_code);
+
 }
 
 
 void saadc_sampling_event_enable(void)
 {
     ret_code_t err_code = nrf_drv_ppi_channel_enable(m_ppi_channel);
-
+    APP_ERROR_CHECK(err_code);
+    err_code = nrf_drv_ppi_channel_enable(m_ppi_channel0);
     APP_ERROR_CHECK(err_code);
 }

RE: Two saadc channels get switched if callback takes too long

Jørgen Holmefjord — Fri, 21 Jun 2019 12:12:21 GMT

Hi,

Please have a look at my answer in this post.

Best regards,
Jørgen