Lastest work

Makefile

@@ -26,6 +26,12 @@ all: $(HEXFILE)
 # characters are not always preserved on Windows. To ensure WinAVR
 # compatibility define the file type manually.
 
+rxcode.asm: generate_rxcode.sh
+	generate_rxcode.sh > rxcode.asm
+
+maplebus.o: maplebus.c rxcode.asm
+	$(CC) $(CFLAGS) -c $< -o $@
+
 .c.s:
 	$(CC) $(CFLAGS) -S $< -o $@
 

dc_pad.c

@@ -89,8 +89,6 @@ const unsigned char dcPadDevDesc[] PROGMEM = {    /* USB device descriptor */
     1, /* number of configurations */
 };
 
-static uint32_t request_device_info[1] = { 0x01200000 };
-static uint32_t get_condition[2] = { 0x09200001, 0x00000001 };
 
 static void dcInit(void)
 {
@@ -102,39 +100,98 @@ static void dcInit(void)
 	dcGamepad.deviceDescriptor = (void*)dcPadDevDesc;
 	dcGamepad.deviceDescriptorSize = sizeof(dcPadDevDesc);
 	
-	maple_sendFrame(request_device_info, 1);
 }
 
+#define MAX_ERRORS 10
+
+#define STATE_GET_INFO	0
+#define STATE_WRITE_LCD	1
+#define STATE_READ_PAD	2
+
+#define MAPLE_CMD_RQ_DEV_INFO	1
+#define MAPLE_CMD_RESET_DEVICE	3
+#define MAPLE_CMD_GET_CONDITION	9
+#define MAPLE_CMD_BLOCK_WRITE	12
+
+#define MAPLE_ADDR_PORT(id)		((id)<<6)
+#define MAPLE_ADDR_PORTA		MAPLE_ADDR_PORT(0)
+#define MAPLE_ADDR_PORTB		MAPLE_ADDR_PORT(1)
+#define MAPLE_ADDR_PORTC		MAPLE_ADDR_PORT(2)
+#define MAPLE_ADDR_PORTD		MAPLE_ADDR_PORT(3)
+#define MAPLE_ADDR_MAIN			0x20
+#define MAPLE_ADDR_SUB(id)		((1)<<id) /* where id is 0 to 4 */
+
+#define MAPLE_DC_ADDR	0
+#define MAPLE_HEADER(cmd,dst_addr,src_addr,len)	( (((cmd)&0xfful)<<24) | (((dst_addr)&0xfful)<<16) | (((src_addr)&0xfful)<<8) | ((len)&0xff))
+
+static uint32_t request_device_info[1] = { MAPLE_HEADER(MAPLE_CMD_RQ_DEV_INFO, MAPLE_ADDR_MAIN | MAPLE_ADDR_PORTA, MAPLE_DC_ADDR, 0) };
+static uint32_t get_condition[2] = { 0x09200001, 0x00000001 };
+static uint32_t block_write_lcd[4] = { 0x0c300003, 0x004, 0,  0xf0f0f0f0 };
+
 static void dcReadPad(void)
 {
+	static unsigned char state = STATE_GET_INFO;
+	static unsigned char err_count = 0;
+	static unsigned char controller_address = 0;
 	unsigned char tmp[30];
-	static unsigned char a;
 	int v;
-	unsigned char lrc = 0;
-	int i;
+
+	switch (state)
+	{
+		case STATE_GET_INFO:
+			maple_sendFrame(request_device_info, 1);
+			v = maple_receivePacket(tmp, 30);
+			_delay_ms(2);
+			if (v==-2) {
+				controller_address = tmp[1]; // sender address
+				state = STATE_WRITE_LCD;
+			}
+			break;
+
+		case STATE_WRITE_LCD:
+			{
+				int i;
+
+				for (i=0; i<5; i++)
+				{
+					uint32_t request_device_info1[1] = { MAPLE_HEADER(MAPLE_CMD_RQ_DEV_INFO, MAPLE_ADDR_PORTA | MAPLE_ADDR_SUB(i), MAPLE_DC_ADDR, 0) };
+
+					if (controller_address & (1<<i)) {
+						maple_sendFrame(request_device_info1, 1);
+						_delay_us(300);
+					}
+
+				}
+
+			}
+			break;
+
+		case STATE_READ_PAD:
+			maple_sendFrame(get_condition, 2);
+			v = maple_receivePacket(tmp, 30);
+			if (v<=0) {
+				err_count++;
+				if (err_count > MAX_ERRORS)
+					state = STATE_GET_INFO;
+				return;
+			}
+			err_count = 0;
 	
-again:
-
-	maple_sendFrame(get_condition, 2);
-	v = maple_receivePacket(tmp, 30);
-
-	if (v<0)
-		return;
 	
-	// 8 : Left trigger
-	// 9 : Right trigger
-	// 10 : Buttons
-	// 11 : Buttons
-	// 12 : Joy Y 2
-	// 13 : Joy X 2
-	// 14 : Y axis
-	// 15 : X axis
-	//
-
-	last_built_report[0][0] = tmp[15]-1;
-	last_built_report[0][1] = tmp[14]-1;
-	last_built_report[0][2] = tmp[10] ^ 0xff;
-	last_built_report[0][3] = tmp[11] ^ 0xff;
+			// 8 : Buttons
+			// 9 : Buttons
+			// 10 : R trig
+			// 11 : L trig
+			// 12 : Joy X axis
+			// 13 : Joy Y axis
+			// 14 : Joy X2 axis
+			// 15 : Joy Y2 axis
+			last_built_report[0][0] = tmp[12]-1;
+			last_built_report[0][1] = tmp[13]-1;
+			last_built_report[0][2] = tmp[8] ^ 0xff;
+			last_built_report[0][3] = tmp[9] ^ 0xff;
+			break;
+	}
 }
 
 static void dcUpdate(void)

generate_rxcode.sh

@@ -7,6 +7,5 @@ echo "// Number of samples: $NSAMPLES"
 
 for i in `seq 0 $NSAMPLES` 
 	do 
-		echo "\"   in r16, %1\n   st z+, r16   \n\" // sample $i "
-		#echo "\"   in r16, %1\n   sbi 0x5, 4\ncbi 0x5, 4  \n\" // sample $i "
+		echo "\"   in r16, %2\n   st z+, r16   \n\" // sample $i "
 done

maplebus.c

@@ -10,6 +10,7 @@
 
 void maple_init(void)
 {
+	DDRC &= ~0x03;
 }
 
 #define MAPLE_BUF_SIZE	640
@@ -117,23 +118,7 @@ static int maplebus_decode(unsigned char *data, unsigned int maxlen)
 		last_fell = fell;
 		last = cur;
 	}
-
 	
-#if 0
-	for (i=0; i<dst_pos; i++) {
-		int j;
-		for (j=0; j<8; j++) {
-			if (data[i] & (0x80 >> j)) {
-				PORTB |= 0x10;
-			} else {
-				PORTB &= ~0x10;
-			}
-			_delay_us(5);
-		}
-	}
-	PORTB &= ~0x10;
-#endif
-
 	return dst_pos;
 }
 
@@ -146,6 +131,7 @@ int maple_receivePacket(unsigned char *data, unsigned int maxlen)
 {
 	unsigned char *tmp = maplebuf;
 	unsigned char lrc;
+	unsigned char timeout;
 	int res, i;
 	
 	//
@@ -160,33 +146,47 @@ int maple_receivePacket(unsigned char *data, unsigned int maxlen)
 	asm volatile( 
 			"	push r30		\n" // 2
 			"	push r31		\n"	// 2
+			"	clr %1			\n" // 1 (result=0, no timeout)
 		
-//			"	sbi 0x5, 4		\n" // PB4
-//			"	cbi 0x5, 4		\n"
+			"	sbi 0x5, 4		\n" // PB4
+			"	cbi 0x5, 4		\n"
 
 			// Loop until a change is detected.	
-			"	in r17, %1		\n"
+			"	ldi r18, 255	\n"
+			"	in r17, %2		\n"
 			"wait_start:		\n"
-			"	in r16, %1		\n"
+			"	dec r18			\n"
+			"	breq timeout	\n"
+			"	in r16, %2		\n"
 			"	cp r16, r17		\n"
 			"	breq wait_start	\n"
+			"	rjmp start_rx	\n"
 
+"timeout:\n"
+			"	inc %1			\n" // 1 for timeout
+			"	sbi 0x5, 4		\n" // PB4
+			"	cbi 0x5, 4		\n"
+			"	jmp done		\n"
+
+"start_rx:			\n"
 			"	sbi 0x5, 4		\n" // PB4
 			"	cbi 0x5, 4		\n"
 
 			// We will loose the first bit(s), but
 			// it's only the start of frame.
-
-			"start_rx:			\n"
 			#include "rxcode.asm"			
 
+"done:\n"
 			"	sbi 0x5, 4		\n" // PB4
 			"	cbi 0x5, 4		\n"
 			"	pop r31			\n" // 2
 			"	pop r30			\n" // 2
-		: "=z"(tmp)
+		: "=z"(tmp), "=r"(timeout)
 		: "I" (_SFR_IO_ADDR(PINC))
-		: "r16","r17") ;
+		: "r16","r17","r18") ;
+
+	if (timeout)
+		return -1;
 
 	res = maplebus_decode(data, maxlen);
 	if (res<=0)
@@ -203,6 +203,19 @@ int maple_receivePacket(unsigned char *data, unsigned int maxlen)
 	if (lrc)
 		return -2; // LRC error
 
+	/* Reverse each group of 4 bytes */
+	for (i=0; i<(res-1); i+=4) {
+		unsigned char tmp;
+
+		tmp = data[i+3];
+		data[i+3] = data[i];
+		data[i] = tmp;
+
+		tmp = data[i+2];
+		data[i+2] = data[i+1];
+		data[i+1] = tmp;
+	}
+
 	return res-1; // remove lrc
 }
 
@@ -247,36 +260,14 @@ void maple_sendPacket(unsigned char *data, unsigned char len)
 		"ld r16, z+		\n"
 
 		// Sync
-		SET_1 SET_5
-		DLY_8
-		CLR_1 
-		DLY_8
+		SET_1 SET_5 DLY_8 CLR_1 DLY_8
 
-		CLR_5 	
-		DLY_8
-		SET_5
-		DLY_8
-
-		CLR_5
-		DLY_8
-		SET_5
-		DLY_8
-
-		CLR_5
-		DLY_8
-		SET_5
-		DLY_8
-
-		CLR_5
-		DLY_8
-		SET_5
-		DLY_8
-
-		SET_1
-		CLR_5
+		CLR_5 DLY_8 SET_5 DLY_8 CLR_5
+		DLY_8 SET_5 DLY_8 CLR_5 DLY_8
+		SET_5 DLY_8 CLR_5 DLY_8 SET_5
+		DLY_8 SET_1 CLR_5
 
 		// Pin 5 is low, Pin 1 is high. Ready for 1st phase
-
 		// Note: Coded for 16Mhz (8 cycles = 500ns)
 "next_byte:\n"
 
@@ -284,7 +275,7 @@ void maple_sendPacket(unsigned char *data, unsigned char len)
 		"out %0, r16	\n" // 1  data
 		"cbi %0, 0		\n" // 1  falling edge on pin 1
 		"ld r16, z+		\n" // 2  load phase 2 data
-		"dec r19		\n" // 1  Decrement counter for brne below
+		"nop			\n" // 1
 		"nop			\n" // 1
 		"nop			\n" // 1
 		
@@ -292,11 +283,9 @@ void maple_sendPacket(unsigned char *data, unsigned char len)
 		"out %0, r16	\n" // 1  data
 		"cbi %0, 1		\n" // 1  falling edge on pin 5
 		"ld r16, z+		\n" // 2
-		"nop			\n" // 1
+		"dec r19		\n" // 1  Decrement counter for brne below
 		"brne next_byte	\n" // 2
 
-"done:\n"
-
 		// End of transmission
 		SET_5 DLY_4 CLR_5 DLY_4
 		CLR_1 DLY_8 SET_1 DLY_8 CLR_1 DLY_8 SET_1 DLY_4 SET_5
@@ -310,6 +299,7 @@ void maple_sendPacket(unsigned char *data, unsigned char len)
 		: "r1","r16","r17","r18","r19","r20","r21"
 	);
 
+	// back to input to receive the answer
 	DDRC &= ~0x03;
 }