JSX-C - Revision history

Aoineko: /* Device ID */

2024-11-27T22:45:16Z

‎Device ID

Aoineko: /* Communication state */

2024-11-27T22:44:53Z

‎Communication state

Aoineko: /* Protocol */

2024-11-04T14:14:43Z

‎Protocol

Aoineko: /* Protocol */

2024-11-04T14:14:07Z

‎Protocol

Aoineko: /* Communication state */

2024-11-04T14:13:19Z

‎Communication state

Aoineko at 14:09, 4 November 2024

2024-11-04T14:09:54Z

Aoineko at 14:09, 4 November 2024

2024-11-04T14:09:00Z

Aoineko at 14:08, 4 November 2024

2024-11-04T14:08:40Z

Aoineko: /* Protocol */

2024-11-04T14:07:49Z

‎Protocol

Aoineko at 14:07, 4 November 2024

2024-11-04T14:07:37Z

@@ Line 54: / Line 54: @@
 ==== Device ID ====
-First received data is the JSX device ID:
+First available data is the JSX device ID:
 <syntaxhighlight>
 6 5 4 3 2 1 0

@@ Line 47: / Line 47: @@
 Read R#14
 : Get 6-bit data
 Write R#15
 : Pin 8: LOW
 ==== Device ID ====

@@ Line 8: / Line 8: @@
 * Leaving Pin 8 LOW for long enough (>1 ms, about 3580 t-states) resets the joystick's internal counter,
 * then successive pulses on Pin 8 (LOW > HIGH) are used for data transmission (6 bits per 6 bits).
 Internal counter is used to send successive data: first the device ID, then each of the input data.

@@ Line 3: / Line 3: @@
 Proposal for a protocol to handle joypads with a '''variable number of sticks and buttons''', plug in the MSX’s '''[https://www.msx.org/wiki/General_Purpose_port general purpose port]'''.
-This protocol can manage joypads with up to '''15 analog axis''' (one stick requires 2 axis) and '''18 buttons'''.
+This protocol can manage joypads with up to '''15 analog axis''' (one stick requires 2 axis) and '''18 buttons''' (3 rows of 6 buttons each).
 Pin 8 is used to synchronize data transmission:

@@ Line 44: / Line 44: @@
 Read R#14
-: 6-bit data
+: Get 6-bit data
 ==== Device ID ====

@@ Line 12: / Line 12: @@
 Pin binding for received 6-bit data when reading through R#14:
-<syntaxhighlight> 7 6 5 4 3 2 1 0
+<syntaxhighlight>
------------------
+6 5 4 3 2 1 0
-0 P P P P P P
+---------------
-     │ │ │ │ │ └── Pin 1
+0 P P P P P P
-     │ │ │ │ └──── Pin 2
+    │ │ │ │ │ └── Pin 1
-     │ │ │ └────── Pin 3
+    │ │ │ │ └──── Pin 2
-     │ │ └──────── Pin 4
+    │ │ │ └────── Pin 3
-     │ └────────── Pin 6
+    │ │ └──────── Pin 4
-     └──────────── Pin 7
+    │ └────────── Pin 6
 </syntaxhighlight>
@@ Line 49: / Line 50: @@
 First received data is the JSX device ID:
 <syntaxhighlight>
 6 5 4 3 2 1 0
------------------
+---------------
 0 A A A A B B
-     │ │ │ │ └─┴── Number of button rows (0-3)
+    │ │ │ │ └─┴── Number of button rows (0-3)
-     │ │ │ │         0: No button
+    │ │ │ │         0: No button
-     │ │ │ │         1: Up to 6 buttons
+    │ │ │ │         1: Up to 6 buttons
-     │ │ │ │         2: Up to 12 buttons
+    │ │ │ │         2: Up to 12 buttons
-     │ │ │ │         3: Up to 18 buttons
+    │ │ │ │         3: Up to 18 buttons
-     └─┴─┴─┴────── Number of axis (0-15)
+    └─┴─┴─┴────── Number of axis (0-15)
 </syntaxhighlight>
 <u>Note</u>: Number of axis or number of button rows can be zero, but not both. So any device ID up to 0x3F is valid except 0x00.

← Older revision		Revision as of 14:07, 4 November 2024
Line 10:		Line 10:

	Internal counter is used to send successive data: first the device ID, then each of the input data.		Internal counter is used to send successive data: first the device ID, then each of the input data.
		+
		+	Pin binding for received 6-bit data when reading through R#14:
		+	<syntaxhighlight>
		+	7 6 5 4 3 2 1 0
		+	–-–-–-–-–-–-–-–--–-–-
		+	0 0 P P P P P P
		+	│ │ │ │ │ └── Pin 1
		+	│ │ │ │ └──── Pin 2
		+	│ │ │ └────── Pin 3
		+	│ │ └──────── Pin 4
		+	│ └────────── Pin 6
		+	└──────────── Pin 7
		+	</syntaxhighlight>

	== States ==		== States ==