Add hack to enable TX line at module initialization.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@405 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/drv/kdebug.c b/drv/kdebug.c
index d80be75681f901a215bce5d7273deb9dec7f95f8..27e365116552155a5a85789215fd0f4e4a621eb2 100755 (executable)
--- a/drv/kdebug.c
+++ b/drv/kdebug.c
@@ -15,6 +15,9 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.24  2005/04/12 01:36:37  bernie
+ *#* Add hack to enable TX line at module initialization.
+ *#*
  *#* Revision 1.23  2005/04/11 19:10:27  bernie
  *#* Include top-level headers from cfg/ subdir.
  *#*
@@ -67,9 +70,16 @@
                /*
                 * Support for special bus policies or external transceivers
                 * on UART0 (to be overridden in "hw.h").
+                *
+                * HACK: if we don't set TXEN, kdbg disables the transmitter
+                * after each output statement until the serial driver
+                * is initialized.  These glitches confuse the debug
+                * terminal that ends up printing some trash.
                 */
                #ifndef KDBG_UART0_BUS_INIT
-               #define KDBG_UART0_BUS_INIT  do {} while (0)
+               #define KDBG_UART0_BUS_INIT  do { \
+                               UCSR0B = BV(TXEN); \
+                       } while (0)
                #endif
                #ifndef KDBG_UART0_BUS_RX
                #define KDBG_UART0_BUS_RX    do {} while (0)
@@ -123,9 +133,16 @@
                /*
                 * Support for special bus policies or external transceivers
                 * on UART1 (to be overridden in "hw.h").
+                *
+                * HACK: if we don't set TXEN, kdbg disables the transmitter
+                * after each output statement until the serial driver
+                * is initialized.  These glitches confuse the debug
+                * terminal that ends up printing some trash.
                 */
                #ifndef KDBG_UART1_BUS_INIT
-               #define KDBG_UART1_BUS_INIT  do {} while (0)
+               #define KDBG_UART1_BUS_INIT  do { \
+                               UCSR1B = BV(TXEN); \
+                       } while (0)
                #endif
                #ifndef KDBG_UART1_BUS_RX
                #define KDBG_UART1_BUS_RX    do {} while (0)