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-rw-r--r--src/drivers/stm32/drv_hrt.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/drivers/stm32/drv_hrt.c b/src/drivers/stm32/drv_hrt.c
index 05e1cd8ec..7ef3db970 100644
--- a/src/drivers/stm32/drv_hrt.c
+++ b/src/drivers/stm32/drv_hrt.c
@@ -278,8 +278,10 @@ static void hrt_call_invoke(void);
#ifdef CONFIG_HRT_PPM
/*
* If the timer hardware doesn't support GTIM_CCER_CCxNP, then we will work around it.
+ *
+ * Note that we assume that M3 means STM32F1 (since we don't really care about the F2).
*/
-# ifndef GTIM_CCER_CC1NP
+# ifdef CONFIG_ARCH_CORTEXM3
# define GTIM_CCER_CC1NP 0
# define GTIM_CCER_CC2NP 0
# define GTIM_CCER_CC3NP 0