From 4b5759f82bc2fcd9cb442788cbf72bea26092074 Mon Sep 17 00:00:00 2001 From: Suschman Date: Sat, 22 Apr 2017 16:02:14 +0200 Subject: [PATCH 1/2] clarify effects of lfclk selection As per Softdevice changelog "Synthesized low frequency clock source is not tested or intended for use with BLE stack." Also https://devzone.nordicsemi.com/question/953/what-low-frequency-clock-sources-can-i-use/?answer=955#post-id-955 Maybe option should better be removed? --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index f7cce020..f94a2685 100644 --- a/README.md +++ b/README.md @@ -117,7 +117,7 @@ This Arduino Core does **not** contain any Arduino style API's for BLE functiona If the selected board has an external 32 kHz crystal connected, it will be used as the source for the low frequency clock. Otherwise the internal 32 kHz RC oscillator will be used. The low frequency clock is used by the `delay(ms)` and `millis()` Arduino API's. -The Generic nRF51 and nRF52 board options have an additional menu item under `Tools -> Low Frequency Clock` that allows you to select the low frequency clock source. +The Generic nRF51 and nRF52 board options have an additional menu item under `Tools -> Low Frequency Clock` that allows you to select the low frequency clock source. However, Nordic does not recommend the Synthesized clock, which also has a significant power impact. ## Credits From bec39837ff3670f90b87256339f7570306ef8394 Mon Sep 17 00:00:00 2001 From: Suschman Date: Fri, 28 Apr 2017 21:49:04 +0200 Subject: [PATCH 2/2] clarify effects of lfclk selection As per Softdevice changelog "Synthesized low frequency clock source is not tested or intended for use with BLE stack." Also https://devzone.nordicsemi.com/question/953/what-low-frequency-clock-sources-can-i-use/?answer=955#post-id-955 Maybe option should better be removed? (reverted from commit 4b5759f82bc2fcd9cb442788cbf72bea26092074) --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index f94a2685..f7cce020 100644 --- a/README.md +++ b/README.md @@ -117,7 +117,7 @@ This Arduino Core does **not** contain any Arduino style API's for BLE functiona If the selected board has an external 32 kHz crystal connected, it will be used as the source for the low frequency clock. Otherwise the internal 32 kHz RC oscillator will be used. The low frequency clock is used by the `delay(ms)` and `millis()` Arduino API's. -The Generic nRF51 and nRF52 board options have an additional menu item under `Tools -> Low Frequency Clock` that allows you to select the low frequency clock source. However, Nordic does not recommend the Synthesized clock, which also has a significant power impact. +The Generic nRF51 and nRF52 board options have an additional menu item under `Tools -> Low Frequency Clock` that allows you to select the low frequency clock source. ## Credits