diff options
Diffstat (limited to 'chip/stm32/usart-stm32f3.c')
| -rw-r--r-- | chip/stm32/usart-stm32f3.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/chip/stm32/usart-stm32f3.c b/chip/stm32/usart-stm32f3.c index 18452cb3fb..887d79d21f 100644 --- a/chip/stm32/usart-stm32f3.c +++ b/chip/stm32/usart-stm32f3.c @@ -56,7 +56,14 @@ static struct usart_hw_ops const usart_variant_hw_ops = { void usart_clear_tc(struct usart_config const *config) { - STM32_USART_ICR(config->hw->base) |= STM32_USART_ICR_TCCF; + /* + * ST reference code does blind write to this register, as is usual + * with the "write 1 to clear" convention, despite the datasheet + * listing the bits as "keep at reset value", (which we assume is due + * to copying from the description of reserved bits in read/write + * registers.) + */ + STM32_USART_ICR(config->hw->base) = STM32_USART_ICR_TCCF; } /* |