Macintosh-HW
/
BlueSCSI
mirror of https://github.com/erichelgeson/BlueSCSI.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Work in progress

This commit is contained in:
androda 2022-04-12 06:22:28 -06:00
parent 22eb2c8d3e
commit 4d3ee87c56
1 changed files with 103 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

111
src/BlueSCSI.cpp
View File

@ -53,6 +53,9 @@
#define READ_SPEED_OPTIMIZE 1 // Faster reads
#define WRITE_SPEED_OPTIMIZE 1 // Speeding up writes
#define XCVR 1 // 0 for standard mode
// 1 for transceiver hardware
// SCSI config
#define NUM_SCSIID 7 // Maximum number of supported SCSI-IDs (The minimum is 0)
#define NUM_SCSILUN 2 // Maximum number of LUNs supported (The minimum is 0)
@ -117,8 +120,14 @@ SdFs SD;
#define LED PC13 // LED
// Image Set Selector
#if XCVR == 1
#define IMAGE_SELECT1 PC14
#define IMAGE_SELECT2 PC15
#else
#define IMAGE_SELECT1 PA1
#define IMAGE_SELECT2 PB1
#endif
// GPIO register port
#define PAREG GPIOA->regs
@ -152,6 +161,39 @@ SdFs SD;
// SCSI input pin check (inactive=0,avtive=1)
#define SCSI_IN(VPIN) ((~GPIOREG(VPIN)->IDR>>(VPIN&15))&1)
#if XCVR == 1
#define TR_TARGET PA1 // Target Transceiver Control Pin
#define TR_DBP PA2 // Data Pins Transceiver Control Pin
#define TR_INITIATOR PA3 // Initiator Transciever Control Pin
#define vTR_TARGET PA(1) // Target Transceiver Control Pin
#define vTR_DBP PA(2) // Data Pins Transceiver Control Pin
#define vTR_INITIATOR PA(3) // Initiator Transciever Control Pin
#define TR_INPUT 1
#define TR_OUTPUT 0
// Transceiver control definitions
#define TRANSCEIVER_IO_SET(VPIN,TR_INPUT) { GPIOREG(VPIN)->BSRR = BITMASK(VPIN) << ((TR_INPUT) ? 16 : 0); }
// Turn on the output only for BSY
#define SCSI_BSY_ACTIVE() { gpio_mode(BSY, GPIO_OUTPUT_PP); SCSI_OUT(vBSY, active) }
// BSY,REQ,MSG,CD,IO Turn off output, BSY is the last input
#define SCSI_TARGET_INACTIVE() { gpio_mode(REQ, GPIO_INPUT_FLOATING); gpio_mode(MSG, GPIO_INPUT_FLOATING); gpio_mode(CD, GPIO_INPUT_FLOATING); gpio_mode(IO, GPIO_INPUT_FLOATING); gpio_mode(BSY, GPIO_INPUT_FLOATING); TRANSCEIVER_IO_SET(vTR_TARGET,TR_INPUT); }
#define DB_MODE_OUT 1 // push-pull mode
#define DB_MODE_IN 4 // floating inputs
#else
// Turn on the output only for BSY
#define SCSI_BSY_ACTIVE() { gpio_mode(BSY, GPIO_OUTPUT_OD); SCSI_OUT(vBSY, active) }
// BSY,REQ,MSG,CD,IO Turn off output, BSY is the last input
#define SCSI_TARGET_INACTIVE() { if (DB_MODE_OUT == 7) SCSI_OUT(vREQ,inactive) else { if (DB_MODE_IN == 8) gpio_mode(REQ, GPIO_INPUT_PU) else gpio_mode(REQ, GPIO_INPUT_FLOATING)} SCSI_OUT(vMSG,inactive); SCSI_OUT(vCD,inactive);SCSI_OUT(vIO,inactive); gpio_mode(BSY, GPIO_INPUT_PU); }
// GPIO mode
// IN , FLOAT : 4
// IN , PU/PD : 8
@ -161,18 +203,14 @@ SdFs SD;
//#define DB_MODE_OUT 7
#define DB_MODE_IN 8
#endif
// Put DB and DP in output mode
#define SCSI_DB_OUTPUT() { PBREG->CRL=(PBREG->CRL &0xfffffff0)|DB_MODE_OUT; PBREG->CRH = 0x11111111*DB_MODE_OUT; }
// Put DB and DP in input mode
#define SCSI_DB_INPUT() { PBREG->CRL=(PBREG->CRL &0xfffffff0)|DB_MODE_IN ; PBREG->CRH = 0x11111111*DB_MODE_IN; if (DB_MODE_IN == 8) PBREG->BSRR = 0xFF01;}
// Turn on the output only for BSY
#define SCSI_BSY_ACTIVE() { gpio_mode(BSY, GPIO_OUTPUT_OD); SCSI_OUT(vBSY, active) }
// BSY,REQ,MSG,CD,IO Turn on the output (no change required for OD)
#define SCSI_TARGET_ACTIVE() { if (DB_MODE_OUT != 7) gpio_mode(REQ, GPIO_OUTPUT_PP);}
// BSY,REQ,MSG,CD,IO Turn off output, BSY is the last input
#define SCSI_TARGET_INACTIVE() { if (DB_MODE_OUT == 7) SCSI_OUT(vREQ,inactive) else { if (DB_MODE_IN == 8) gpio_mode(REQ, GPIO_INPUT_PU) else gpio_mode(REQ, GPIO_INPUT_FLOATING)} SCSI_OUT(vMSG,inactive); SCSI_OUT(vCD,inactive);SCSI_OUT(vIO,inactive); gpio_mode(BSY, GPIO_INPUT_PU); }
// HDDiamge file
#define HDIMG_ID_POS 2 // Position to embed ID number
#define HDIMG_LUN_POS 3 // Position to embed LUN numbers
@ -405,6 +443,15 @@ void setup()
LED_OFF();
#if XCVR == 1
// Transceiver Pin Initialization
gpio_mode(TR_TARGET, GPIO_OUTPUT_PP);
gpio_mode(TR_INITIATOR, GPIO_OUTPUT_PP);
gpio_mode(TR_DBP, GPIO_OUTPUT_PP);
TRANSCEIVER_IO_SET(vTR_INITIATOR,TR_INPUT);
#endif
//GPIO(SCSI BUS)Initialization
//Port setting register (lower)
// GPIOB->regs->CRL |= 0x000000008; // SET INPUT W/ PUPD on PAB-PB0
@ -414,6 +461,24 @@ void setup()
// DB and DP are input modes
SCSI_DB_INPUT()
#if XCVR == 1
TRANSCEIVER_IO_SET(vTR_DBP,TR_INPUT);
// Initiator port
gpio_mode(ATN, GPIO_INPUT_FLOATING);
gpio_mode(BSY, GPIO_INPUT_FLOATING);
gpio_mode(ACK, GPIO_INPUT_FLOATING);
gpio_mode(RST, GPIO_INPUT_FLOATING);
gpio_mode(SEL, GPIO_INPUT_FLOATING);
TRANSCEIVER_IO_SET(vTR_INITIATOR,TR_INPUT);
// Target port
gpio_mode(MSG, GPIO_INPUT_FLOATING);
gpio_mode(CD, GPIO_INPUT_FLOATING);
gpio_mode(REQ, GPIO_INPUT_FLOATING);
gpio_mode(IO, GPIO_INPUT_FLOATING);
TRANSCEIVER_IO_SET(vTR_TARGET,TR_INPUT);
#else
// Input port
gpio_mode(ATN, GPIO_INPUT_PU);
gpio_mode(BSY, GPIO_INPUT_PU);
@ -425,6 +490,8 @@ void setup()
gpio_mode(CD, GPIO_OUTPUT_OD);
gpio_mode(REQ, GPIO_OUTPUT_OD);
gpio_mode(IO, GPIO_OUTPUT_OD);
#endif
// Turn off the output port
SCSI_TARGET_INACTIVE()
@ -776,6 +843,9 @@ inline byte readHandshake(void)
inline void writeHandshake(byte d)
{
GPIOB->regs->BSRR = db_bsrr[d]; // setup DB,DBP (160ns)
#if XCVR == 1
TRANSCEIVER_IO_SET(vTR_DBP,TR_OUTPUT)
#endif
SCSI_DB_OUTPUT() // (180ns)
// ACK.Fall to DB output delay 100ns(MAX) (DTC-510B)
SCSI_OUT(vREQ,inactive) // setup wait (30ns)
@ -788,6 +858,9 @@ inline void writeHandshake(byte d)
GPIOB->regs->BSRR = DBP(0xff); // DB=0xFF , SCSI_OUT(vREQ,inactive)
// REQ.Raise to DB hold time 0ns
SCSI_DB_INPUT() // (150ns)
#if XCVR == 1
TRANSCEIVER_IO_SET(vTR_DBP,TR_INPUT)
#endif
while( SCSI_IN(vACK));
}
@ -840,6 +913,9 @@ void writeDataLoop(uint32_t blocksize)
// Start the first bus cycle.
FETCH_BSRR_DB();
REQ_OFF_DB_SET(bsrr_val);
#if XCVR == 1
TRANSCEIVER_IO_SET(vTR_DBP,TR_OUTPUT)
#endif
REQ_ON();
FETCH_BSRR_DB();
WAIT_ACK_ACTIVE();
@ -899,6 +975,9 @@ void writeDataPhaseSD(uint32_t adds, uint32_t len)
#endif
}
SCSI_DB_INPUT()
#if XCVR == 1
TRANSCEIVER_IO_SET(vTR_DBP,TR_INPUT)
#endif
}
/*
@ -1464,6 +1543,15 @@ void MsgOut2()
*/
void loop()
{
#if XCVR == 1
// Reset all DB and Target pins, switch transceivers to input
// Precaution against bugs or jumps which don't clean up properly
SCSI_DB_INPUT();
TRANSCEIVER_IO_SET(vTR_DBP,TR_INPUT)
SCSI_TARGET_INACTIVE();
TRANSCEIVER_IO_SET(vTR_INITIATOR,TR_INPUT)
#endif
//int msg = 0;
m_msg = 0;
@ -1486,6 +1574,10 @@ void loop()
goto BusFree;
}
enableResetJmp();
#if XCVR == 1
TRANSCEIVER_IO_SET(vTR_TARGET,TR_OUTPUT);
#endif
// Set BSY to-when selected
SCSI_BSY_ACTIVE(); // Turn only BSY output ON, ACTIVE
@ -1495,7 +1587,7 @@ void loop()
// Wait until SEL becomes inactive
while(isHigh(gpio_read(SEL)) && isLow(gpio_read(BSY))) {
}
SCSI_TARGET_ACTIVE() // (BSY), REQ, MSG, CD, IO output turned on
//
if(isHigh(gpio_read(ATN))) {
bool syncenable = false;
@ -1706,4 +1798,7 @@ BusFree:
//SCSI_OUT(vIO ,inactive) // gpio_write(IO, low);
//SCSI_OUT(vBSY,inactive)
SCSI_TARGET_INACTIVE() // Turn off BSY, REQ, MSG, CD, IO output
#if XCVR == 1
TRANSCEIVER_IO_SET(vTR_TARGET,TR_INPUT);
#endif
}