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ArmPlatformPkg/PL011Uart: PL011UartWrite() stop to transmit if the buffer is full

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Before we were waiting the buffer to be empty before to continue to send data.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13587 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
oliviermartin
2012-08-02 14:22:51 +00:00
parent 93b429fc21
commit ebef1b7421
1 changed files with 5 additions and 3 deletions
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8
ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c
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@@ -304,10 +304,12 @@ PL011UartWrite (
IN UINTN NumberOfBytes IN UINTN NumberOfBytes
) )
{ {
UINTN Count; UINT8* CONST Final = &Buffer[NumberOfBytes];
for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) { while (Buffer < Final) {
while ((MmioRead32 (UartBase + UARTFR) & UART_TX_EMPTY_FLAG_MASK) == 0); // Wait until UART able to accept another char
while ((MmioRead32 (UartBase + UARTFR) & UART_TX_FULL_FLAG_MASK));
MmioWrite8 (UartBase + UARTDR, *Buffer); MmioWrite8 (UartBase + UARTDR, *Buffer);
} }