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Before resetting the USART, delay a bit to allow the transmitter to

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finish the current character to drain to avoid glitching. Also,
simplify the code a smidge.
This commit is contained in:
Warner Losh 2014-01-26 04:57:58 +00:00
parent 321c39ba84
commit 9107643c54
1 changed files with 2 additions and 3 deletions
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5
sys/arm/at91/uart_dev_at91usart.c
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@ -421,7 +421,6 @@ at91_usart_bus_attach(struct uart_softc *sc)
{
int err;
int i;
uint32_t cr;
struct at91_usart_softc *atsc;
atsc = (struct at91_usart_softc *)sc;
@ -490,8 +489,8 @@ at91_usart_bus_attach(struct uart_softc *sc)
}
/* Turn on rx and tx */
cr = USART_CR_RSTSTA | USART_CR_RSTRX | USART_CR_RSTTX;
WR4(&sc->sc_bas, USART_CR, cr);
DELAY(1000); /* Give pending character a chance to drain. */
WR4(&sc->sc_bas, USART_CR, USART_CR_RSTSTA | USART_CR_RSTRX | USART_CR_RSTTX);
WR4(&sc->sc_bas, USART_CR, USART_CR_RXEN | USART_CR_TXEN);
/*