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-rw-r--r--src/stmf0/ao_timer.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/stmf0/ao_timer.c b/src/stmf0/ao_timer.c
index 82a4cad6..3aae7e55 100644
--- a/src/stmf0/ao_timer.c
+++ b/src/stmf0/ao_timer.c
@@ -247,6 +247,10 @@ ao_clock_init(void)
/* Clear reset flags */
stm_rcc.csr |= (1 << STM_RCC_CSR_RMVF);
+#if !AO_HSI && !AO_NEED_HSI
+ /* Turn off the HSI clock */
+ stm_rcc.cr &= ~(1 << STM_RCC_CR_HSION);
+#endif
#if DEBUG_THE_CLOCK
/* Output SYSCLK on PA8 for measurments */