bilbo/saturn
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

make the smpc intback interrupt do something

Browse Source
This commit is contained in:
Zack Buhman 2023-01-09 19:41:02 -08:00
parent fe51d016df
commit fa41d47e1f
2 changed files with 55 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
main.c
View File

@ -44,7 +44,7 @@ void oci_int(void)
smpc.reg.IREG0 = INTBACK__IREG0__STATUS_DISABLE;
smpc.reg.IREG1 = ( INTBACK__IREG1__PERIPHERAL_DATA_ENABLE
| INTBACK__IREG1__PORT2_15BYTE
| INTBACK__IREG1__PORT2_0BYTE
| INTBACK__IREG1__PORT1_15BYTE
);
smpc.reg.IREG2 = INTBACK__IREG2__MAGIC;
@ -60,6 +60,26 @@ void smpc_int(void)
{
scu.reg.IST &= ~(IST__SMPC);
if (smpc.reg.SR & SR__PDL) {
// to get all controller data, one should check SR__NPE and send CONTINUE
// requests as needed
// assuming SR__PDL is set and SR__P1MD is not 0-byte-mode:
// smpc.reg.OREG0 (port 1 status)
// smpc.reg.OREG1 (peripheral 1 data[0] {type,size})
// smpc.reg.OREG2 (peripheral 1 data[1])
if ((smpc.reg.OREG2 & DIGITAL__1__C) == 0) {
// if C is pressed, swap the color palette
vdp2.cram.u16[1] = (0x31 << 10); // blue
vdp2.cram.u16[2] = (0x31 << 5); // green
} else {
// if C is not pressed, restore the original palette
vdp2.cram.u16[1] = (0x31 << 5); // green
vdp2.cram.u16[2] = (0x31 << 10); // blue
}
}
smpc.reg.IREG0 = INTBACK__IREG0__BREAK;
}

34
smpc.h
View File

@ -180,3 +180,37 @@ enum intback_ireg_bit {
INTBACK__IREG2__MAGIC = (0xF0),
};
enum sr_bit {
SR__PDL = (1 << 6),
SR__NPE = (1 << 5),
SR__RESB = (1 << 4),
SR__P2MD1 = (1 << 3),
SR__P2MD0 = (1 << 2),
SR__P1MD1 = (1 << 1),
SR__P1MD0 = (1 << 0),
#define SR__P2MD__15BYTE(sr) (((sr & 0b00001100)) == (0b00 << 2))
#define SR__P2MD__255BYTE(sr) (((sr & 0b00001100)) == (0b01 << 2))
#define SR__P2MD__0BYTE(sr) (((sr & 0b00001100)) == (0b11 << 2))
#define SR__P1MD__15BYTE(sr) (((sr & 0b00000011)) == (0b00 << 0))
#define SR__P1MD__255BYTE(sr) (((sr & 0b00000011)) == (0b01 << 0))
#define SR__P1MD__0BYTE(sr) (((sr & 0b00000011)) == (0b11 << 0))
};
enum digital_bit {
DIGITAL__1__RIGHT = (1 << 7),
DIGITAL__1__LEFT = (1 << 6),
DIGITAL__1__DOWN = (1 << 5),
DIGITAL__1__UP = (1 << 4),
DIGITAL__1__START = (1 << 3),
DIGITAL__1__A = (1 << 2),
DIGITAL__1__C = (1 << 1),
DIGITAL__1__B = (1 << 0),
DIGITAL__2__R = (1 << 7),
DIGITAL__2__X = (1 << 6),
DIGITAL__2__Y = (1 << 5),
DIGITAL__2__Z = (1 << 4),
DIGITAL__2__L = (1 << 3),
};