[cadcdev-svn-commits] [SCM] branch master updated. 09b44b0d5e40e9302a71c9269e7df36c08377f1a

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- Log -----------------------------------------------------------------
commit 09b44b0d5e40e9302a71c9269e7df36c08377f1a
Author: Zack Buhman <za...@bu...>
Date:   Sat May 17 16:14:49 2025 -0500

    scif: disable MCE by default
    
    Enabling MCE is not a reasonable library default because the typical USB-UARTs
    that are connected to the Dreamcast have large ~1024 byte TX/RX buffers and the
    maximum Dreamcast SCIF baud rate is slow compared to the capabilities of these
    chips.
    
    Given the use-case for scif.c appears to be to allow for synchronously-blocking
    debug prints over scif, from a library/policy perspective MCE should be
    considered a "specialized" configuration.
    
    For KallistiOS users, the behavior prior to this commit was:
    
    - serial transmission may be silently permanently disabled due to the SCIF CTS
      pin being disconnected or tied high
    
    - it is not possible to use RTS/CTS as GPIO pins while also using scif.c

-----------------------------------------------------------------------

Summary of changes:
 kernel/arch/dreamcast/hardware/scif.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/arch/dreamcast/hardware/scif.c b/kernel/arch/dreamcast/hardware/scif.c
index 4ceab8ca..70b7254b 100644
--- a/kernel/arch/dreamcast/hardware/scif.c
+++ b/kernel/arch/dreamcast/hardware/scif.c
@@ -242,8 +242,8 @@ int scif_init(void) {
     for(i = 0; i < 800000; i++)
         __asm__("nop");
 
-    /* Unreset, enable hardware flow control, triggers on 8 bytes */
-    SCFCR2 = 0x48;
+    /* Unreset, disable hardware flow control, triggers on 8 bytes */
+    SCFCR2 = 0x40;
 
     /* Disable manual pin control */
     SCSPTR2 = 0;


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A pseudo Operating System for the Dreamcast.