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hw/char/stm32f2xx_usart: Do not update data register when device is disabled
When the device is disabled, the internal circuitry keeps the data register loaded and doesn't update it. Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20190104182057.8778-1-philmd@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@ -53,14 +53,13 @@ static void stm32f2xx_usart_receive(void *opaque, const uint8_t *buf, int size)
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{
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STM32F2XXUsartState *s = opaque;
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s->usart_dr = *buf;
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if (!(s->usart_cr1 & USART_CR1_UE && s->usart_cr1 & USART_CR1_RE)) {
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/* USART not enabled - drop the chars */
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DB_PRINT("Dropping the chars\n");
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return;
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}
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s->usart_dr = *buf;
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s->usart_sr |= USART_SR_RXNE;
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if (s->usart_cr1 & USART_CR1_RXNEIE) {
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