diff options
| author | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-08-02 14:22:51 +0000 |
|---|---|---|
| committer | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-08-02 14:22:51 +0000 |
| commit | ebef1b74218b53f72859b08f1d6710407789a14b (patch) | |
| tree | 17ac7afb0aac6e45cf8b0fb7c93c3cb992680362 | |
| parent | 93b429fc213bd935b5d90c71e8e8b4523253e445 (diff) | |
| download | edk2-platforms-ebef1b74218b53f72859b08f1d6710407789a14b.tar.xz | |
ArmPlatformPkg/PL011Uart: PL011UartWrite() stop to transmit if the buffer is full
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
| -rw-r--r-- | ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c index d728121b29..1f33bd1ef0 100644 --- a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c +++ b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c @@ -304,10 +304,12 @@ PL011UartWrite ( IN UINTN NumberOfBytes
)
{
- UINTN Count;
+ UINT8* CONST Final = &Buffer[NumberOfBytes];
- for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {
- while ((MmioRead32 (UartBase + UARTFR) & UART_TX_EMPTY_FLAG_MASK) == 0);
+ while (Buffer < Final) {
+ // Wait until UART able to accept another char
+ while ((MmioRead32 (UartBase + UARTFR) & UART_TX_FULL_FLAG_MASK));
+
MmioWrite8 (UartBase + UARTDR, *Buffer);
}
|