diff --git a/include/libopencm3/stm32/common/usart_common_all.h b/include/libopencm3/stm32/common/usart_common_all.h
index 5a41684b..8c310a9c 100644
--- a/include/libopencm3/stm32/common/usart_common_all.h
+++ b/include/libopencm3/stm32/common/usart_common_all.h
@@ -122,6 +122,8 @@ void usart_enable_tx_interrupt(uint32_t usart);
 void usart_disable_tx_interrupt(uint32_t usart);
 void usart_enable_tx_complete_interrupt(uint32_t usart);
 void usart_disable_tx_complete_interrupt(uint32_t usart);
+void usart_enable_idle_interrupt(uint32_t usart);
+void usart_disable_idle_interrupt(uint32_t usart);
 void usart_enable_error_interrupt(uint32_t usart);
 void usart_disable_error_interrupt(uint32_t usart);
 bool usart_get_flag(uint32_t usart, uint32_t flag);
diff --git a/lib/stm32/common/usart_common_all.c b/lib/stm32/common/usart_common_all.c
index 3565e802..e30e2feb 100644
--- a/lib/stm32/common/usart_common_all.c
+++ b/lib/stm32/common/usart_common_all.c
@@ -376,6 +376,29 @@ void usart_disable_tx_complete_interrupt(uint32_t usart)
 	USART_CR1(usart) &= ~USART_CR1_TCIE;
 }
 
+/** @brief USART Idle Interrupt Enable.
+
+@param[in] usart unsigned 32 bit. USART block register address base @ref
+usart_reg_base
+*/
+
+void usart_enable_idle_interrupt(uint32_t usart)
+{
+	USART_CR1(usart) |= USART_CR1_IDLEIE;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief USART Idle Interrupt Disable.
+
+@param[in] usart unsigned 32 bit. USART block register address base @ref
+usart_reg_base
+*/
+
+void usart_disable_idle_interrupt(uint32_t usart)
+{
+	USART_CR1(usart) &= ~USART_CR1_IDLEIE;
+}
+
 /*---------------------------------------------------------------------------*/
 /** @brief USART Error Interrupt Enable.