diff options
| author | Matt Harvey <matt@teamdawg.org> | 2020-09-14 14:49:57 -0700 |
|---|---|---|
| committer | Frans Kaashoek <kaashoek@mit.edu> | 2020-10-03 16:35:47 -0400 |
| commit | b9359c353318ba70596b55ec57f8d9f6c43c2758 (patch) | |
| tree | 5ef3b9930268af82827696ec2e88ca10909ecc24 /kernel | |
| parent | b96547403df0e07865bc2269215cfeb0260b893d (diff) | |
| download | xv6-labs-b9359c353318ba70596b55ec57f8d9f6c43c2758.tar.gz xv6-labs-b9359c353318ba70596b55ec57f8d9f6c43c2758.tar.bz2 xv6-labs-b9359c353318ba70596b55ec57f8d9f6c43c2758.zip | |
Corrects order of UART RX/TX interrupt enable bits
(per http://byterunner.com/16550.html and manually tested in qemu bare metal echo)
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/uart.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/uart.c b/kernel/uart.c index ce89615..d586ea4 100644 --- a/kernel/uart.c +++ b/kernel/uart.c @@ -22,8 +22,8 @@ #define RHR 0 // receive holding register (for input bytes) #define THR 0 // transmit holding register (for output bytes) #define IER 1 // interrupt enable register -#define IER_TX_ENABLE (1<<0) -#define IER_RX_ENABLE (1<<1) +#define IER_RX_ENABLE (1<<0) +#define IER_TX_ENABLE (1<<1) #define FCR 2 // FIFO control register #define FCR_FIFO_ENABLE (1<<0) #define FCR_FIFO_CLEAR (3<<1) // clear the content of the two FIFOs |