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DIY Xbox 360 PC wireless receiver with MSP430 control

Abstract

Xbox 360 wireless controller can be used with PC when special adapter is used. Xbox 360 itself has a separate RF module that communicates with motherboard through USB interface. Additional interface is used to initialize module LEDs and start sync process. One can create adapter for a fraction of cost using only several elements.

Description

Pinout of the RF board from top:

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Board must be powered by 3v3 so I decided to use LDO. Furthermore to start pairing process specific command must be sent. I have used MSP430G2231 for this task. MCU need reset pull-up resistor and decoupling capacitor. Pins 1 and 8 are connected to RF board.

#include <msp430.h> 
#include <stdbool.h>
 
#define DATA 1
#define CLOCK 8
 
#define DTA_INPUT P1DIR &= ~DATA;
#define DTA_OUTPUT P1DIR |= DATA;
 
#define DTA_HI P1OUT |= DATA;
#define DTA_LO P1OUT &= ~DATA;
 
volatile signed   short bit_counter	=0;
volatile unsigned short command		=0;
 
 //Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
 P1IFG &= ~CLOCK;
 
 // are we sending or receiving?
 if (bit_counter>0)
 {
	 DTA_OUTPUT
	 if (command & (1<<(bit_counter-1)))
		 DTA_HI
	 else
		 DTA_LO
 }
 // stop bit!
 else if (bit_counter == 0)
 {
	 P1OUT |= DATA;
	 command=0;
 }
 else
 {
	 DTA_INPUT
	 if (P1IN&DATA)
		 command |= (1<<((11+bit_counter)));
	 else
		 command &= ~(1<<((11+bit_counter)));
 }
 
 bit_counter--;
}
 
inline void send(char s)
{
	DTA_OUTPUT
	command = s;
	bit_counter = 10;
	DTA_LO				// Send start bit
}
 
//------------------------------------------------------------------------------
 
int main(void)
{
    unsigned short delay=0;
 
    //
    // CLOCK
    //
    WDTCTL = WDTPW | WDTHOLD;		// Stop watchdog timer
    if (CALBC1_1MHZ==0xFF)		// If calibration constants erased
    {
      while(1);                     	// do not load, trap CPU!!
    }
    DCOCTL = 0;                     	// Select lowest DCOx and MODx settings
    BCSCTL1 = CALBC1_1MHZ;
    DCOCTL = CALDCO_1MHZ;
 
    //
    // UART
    //
    setup_uart();
 
    //
    // Serial Interface
    //
    P1OUT |= DATA; 			// DTA HIGH
    P1DIR |= (1<<6);
    DTA_OUTPUT 				// DTA OUTPUT
 
    P1IES |= CLOCK;			// fires on falling edge~
    P1IFG &= ~CLOCK; 			// int cleared
    P1IE |= CLOCK; 			// int enabled
 
    //
    // Start
    //
    __enable_interrupt();
    __delay_cycles(2000000);
 
    send(132);				// LEDs active with power button on
	while(--delay);
	send(0x085);			// Start animation
	while(--delay);
	while(--delay);
	while(--delay);
	while(--delay);
	send(0x004);			// Start sync
 
	__delay_cycles(5000000);	// Give some extra time to finish cmd send
 
	__disable_interrupt();		// Turn off MCU
	_BIS_SR(LPM4_bits);
 
}

Mental Workbench

Table of Contents

DIY Xbox 360 PC wireless receiver with MSP430 control

Abstract

Description

Example

References