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serial/uart_ns16550: keep LCR settings when programming DLAB

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The LCR register specifies the format of the asynchronous data
communication exchange. Keep the data/stop bit and parity settings
intact during baud rate change.

Signed-off-by: Timo Teräs <timo.teras@iki.fi>
This commit is contained in:
Timo Teräs 2017-08-17 19:59:40 +03:00 • committed by Anas Nashif
commit 047a229985
1 changed files with 1 additions and 1 deletions
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2
drivers/serial/uart_ns16550.c
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@ -254,7 +254,7 @@ static void set_baud_rate(struct device *dev, u32_t baud_rate)
/* set the DLAB to access the baud rate divisor registers */
lcr_cache = INBYTE(LCR(dev));
OUTBYTE(LCR(dev), LCR_DLAB);
OUTBYTE(LCR(dev), LCR_DLAB | lcr_cache);
OUTBYTE(BRDL(dev), (unsigned char)(divisor & 0xff));
OUTBYTE(BRDH(dev), (unsigned char)((divisor >> 8) & 0xff));