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+This is a simple program demonstrating how to interface with a CPSF or CPSF-MD joystick. Refer to the following page for joystick register [[joystick_regs|reference]]. Using a second CPSF should follow the same technique but with joyport_b, IOC5 and PC5. It can be compiled with the Lydux toolchain with the following commands:
+<file>
+$ human68k-gcc joytest.c -liocs
+$ human68k-objcopy -O xfile a.out joytest.x
+</file>
+Code:
+<file>
+// This is a simple program demonstrating how to interface with a CPSF or CPSF-MD joystick
+// Using a second CPSF should follow the same technique but with joyport_b, IOC4 and PC5
+#include <stdint.h>
+#include <stdio.h>
+#include <iocslib.h>
+volatile uint8_t *joyport_a = (uint8_t*)0xE9A001;
+volatile uint8_t *joyport_b = (uint8_t*)0xE9A003;
+volatile uint8_t *joyport_c = (uint8_t*)0xE9A005; // joy control
+uint8_t *joycontrolword = (uint8_t*)0xE9A007; // if bit 7 = 0, bit manipulation. if bit 7 = 1, mode setting
+uint8_t	joyport_c_old=0;
+int main(int argc, char *argv[])
+{
+	uint16_t port1 = 0;
+	uint32_t usp = 0;
+	// clear screen
+	printf("\e[2J");
+	// this is working for all buttons with a CPSF or CPSF-MD
+	usp = _iocs_b_super(0);
+	// set IOC4 to 1, disables joystick 1 processing
+	// preserves ADPCM settings
+	joyport_c_old = *joyport_c;
+	*joyport_c = 16|joyport_c_old;
+	while(1)
+	{
+		port1=0;
+		// move cursor to origin
+		printf("\e[;0H");
+		printf("CPSF Controller Tester\n");
+		printf("Press ESC to quit.\n\n");
+		// unset PC4, this is the controller clock/button group select pin
+		*joycontrolword = 8;
+		// read joyport a bits
+		port1 |= (~*joyport_a)<<8;
+		// set PC4
+		*joycontrolword = 9;
+		// read joyport a bits
+		port1 |= (uint8_t)(~*joyport_a);
+		printf("0x%04X\n", port1);
+		// quit on ESC
+		if(_dos_inpout(0xFF)==0x1B){
+			*joycontrolword = 8;
+			*joyport_c = joyport_c_old;
+			_iocs_b_super(usp);
+			return 0;
+		}
+	}
+}
+</file>