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Add improved fix for the ballad sequencer. Thanks Srecko

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2798
This commit is contained in:
Peter Veenstra 2007-02-03 14:11:38 +00:00
parent 88c948bc00
commit 4f7838f172
1 changed files with 9 additions and 10 deletions
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19
src/hardware/mpu401.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: mpu401.cpp,v 1.25 2007-01-28 20:08:52 qbix79 Exp $ */
/* $Id: mpu401.cpp,v 1.26 2007-02-03 14:11:38 qbix79 Exp $ */
#include <string.h>
#include "dosbox.h"
@ -41,6 +41,8 @@ static void MPU401_EOIHandler(void);
enum MpuMode { M_UART,M_INTELLIGENT };
enum MpuDataType {T_OVERFLOW,T_MARK,T_MIDI_SYS,T_MIDI_NORM,T_COMMAND};
static void MPU401_WriteData(Bitu port,Bitu val,Bitu iolen);
/* Messages sent to MPU-401 from host */
#define MSG_EOX 0xf7
#define MSG_OVERFLOW 0xf8
@ -270,13 +272,16 @@ static Bitu MPU401_ReadData(Bitu port,Bitu iolen) {
mpu.state.channel=ret&7;
mpu.state.data_onoff=0;
mpu.state.cond_req=false;
mpu.state.command_byte=0;
}
if (ret==MSG_MPU_COMMAND_REQ) {
mpu.state.data_onoff=0;
mpu.state.cond_req=true;
mpu.state.wsd=mpu.state.wsm=false;
mpu.state.command_byte=0;
if (mpu.condbuf.type!=T_OVERFLOW) {
mpu.state.block_ack=true;
MPU401_WriteCommand(0x331,mpu.condbuf.value[0],1);
if (mpu.state.command_byte) MPU401_WriteData(0x330,mpu.condbuf.value[1],1);
}
mpu.condbuf.type=T_OVERFLOW;
}
if (ret==MSG_MPU_END || ret==MSG_MPU_CLOCK || ret==MSG_MPU_ACK) {
mpu.state.data_onoff=-1;
@ -496,13 +501,7 @@ static void UpdateTrack(Bit8u chan) {
}
static void UpdateConductor(void) {
if (mpu.condbuf.type!=T_OVERFLOW) {
mpu.state.block_ack=true;
MPU401_WriteCommand(0x331,mpu.condbuf.value[0],1);
if (mpu.state.command_byte) MPU401_WriteData(0x330,mpu.condbuf.value[1],1);
}
mpu.condbuf.vlength=0;
mpu.condbuf.type=T_OVERFLOW;
mpu.condbuf.counter=0xf0;
mpu.state.req_mask|=(1<<9);
}