Init Mouse
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#include #include <delay.h> void portinit(); void uart_init(); void transmit(unsigned char x); void host_to_mouse(unsigned char packet); char ps2_init(); void setdataclock(unsigned char datastate, unsigned char clockstate); bit calparity(unsigned char data); #define bitset(var,bitno) ((var)|=1<<(bitno)) #define bitclr(var,bitno) ((var)&=~( 1<<(bitno))) #define #define #define #define
clk_low() rb6=0,bitclr(trisb,6) clk_release() bitset(trisb,6) data_low() rb7=0,bitclr(trisb,7) data_release() bitset(trisb,7)
char ps2_data_in;
bit calparity(unsigned char data) { bit parity=1; unsigned char i; for(i=0;i<8;i++) { parity=parity^(data<
void uart_init() { txsta=0x22;//baud low speed. spbrg=0x0c; //baud rate 19200 rcsta=0x90; //intcon=0xc0; option=0xc0; //pie1=0x20; } void portinit() { trisb=0xff; trisa=0xff; portb=0x00; trisd=0x00; trise=0x07; trisc=0x80; }
void transmit(unsigned char x) { while(txif==0); txreg=x; } void setdataclock(unsigned char datastate,unsigned char clockstate) { if(datastate) bitset(trisb,7);//set tris register bit associated with data line to input else { rb7=0; bitclr(trisb,7);//set tris register bit associated wtih data line to output } if(clockstate) bitset(trisb,6) ;//set tris register bit associated with clock line to input else { rb6=0; bitclr(trisb,6);//set tris register bit associated wtih clock line to output } }
void host_to_mouse(unsigned char packet) { unsigned char i=0; bit parity; ps2_data_in=0; do { setdataclock(1,0); //pull clock low arity = calcparity(packet); delayus(300); //must be greater than 100us setdataclock(0,0); //pull data low setdataclock(0,1); //release clock - device will start generating clock while(!rb6){} //wait for rising edge while(rb6){} //wait for falling edge for(i=0;i<8;i++) { senddataclock((packet<
transmit('<'); transmit(ascii[0]); transmit(ascii[1]); transmit('>'); }while(ps2_data_in!=0xfa); }
bit mouse_to_host(void) { unsigned char temp[8]={0},i; unsigned int a; setdataclock(1,0); //pull clock line low to inhibit communication delayus(100); //must be greater than 100us setdataclock(1,1); //release clock line, data line ready for input while(!rb6){} //wait for clock high for(a=0; a<100; a++) { if((!rb6)&&(!rb7)) //wait for data and clock to be low break; if(a==99) return 0; } for(i=0;i<8;i++) { while(!rb6){} //wait for clock high while(rb6){} //wait for clock low (falling edge); temp[i]=rb7; // store each bit } while(!rb6){} while(rb6){} while(!rb6){} while(rb6){} //wait for last 2 clock pulses (parity and stop) /* following statment combines the collected bits into byte*/ packet=128*temp[7]+64*temp[6]+32*temp[5]+16*temp[4]+8*temp[3]+4*temp[2]+2*temp[1]+ temp[0]; ps2_data_in=packet; return 1; } //function returns 0 if mouse initializes properly //returns 1 if mouse error (0xfc) is received //returns 2 if other code received char ps2_init() { char temp; //sr=4; //set default value host_to_mouse(0xff); //reset command while(!mouse_to_host()){} //mouse init results temp=ps2_data_in; while(!mouse_to_host()){} //mouse id if(temp==0xaa) //0xaa = mouse initialized ok (self test) { host_to_mouse(0xf3); host_to_mouse(10); host_to_mouse(0xf4);//enable data reporting, begin operation
}
} else if(temp==0xfc) return 1; else return 2; return 0;
//0xfc = mouse had init error //code other than 0xaa or 0xfc returned by mouse
void main() { portinit(); uart_init(); while(ps2_init()!=0){} //function returns 0 when init goes ok }
clk_low() rb6=0,bitclr(trisb,6) clk_release() bitset(trisb,6) data_low() rb7=0,bitclr(trisb,7) data_release() bitset(trisb,7)
char ps2_data_in;
bit calparity(unsigned char data) { bit parity=1; unsigned char i; for(i=0;i<8;i++) { parity=parity^(data<
void uart_init() { txsta=0x22;//baud low speed. spbrg=0x0c; //baud rate 19200 rcsta=0x90; //intcon=0xc0; option=0xc0; //pie1=0x20; } void portinit() { trisb=0xff; trisa=0xff; portb=0x00; trisd=0x00; trise=0x07; trisc=0x80; }
void transmit(unsigned char x) { while(txif==0); txreg=x; } void setdataclock(unsigned char datastate,unsigned char clockstate) { if(datastate) bitset(trisb,7);//set tris register bit associated with data line to input else { rb7=0; bitclr(trisb,7);//set tris register bit associated wtih data line to output } if(clockstate) bitset(trisb,6) ;//set tris register bit associated with clock line to input else { rb6=0; bitclr(trisb,6);//set tris register bit associated wtih clock line to output } }
void host_to_mouse(unsigned char packet) { unsigned char i=0; bit parity; ps2_data_in=0; do { setdataclock(1,0); //pull clock low arity = calcparity(packet); delayus(300); //must be greater than 100us setdataclock(0,0); //pull data low setdataclock(0,1); //release clock - device will start generating clock while(!rb6){} //wait for rising edge while(rb6){} //wait for falling edge for(i=0;i<8;i++) { senddataclock((packet<
transmit('<'); transmit(ascii[0]); transmit(ascii[1]); transmit('>'); }while(ps2_data_in!=0xfa); }
bit mouse_to_host(void) { unsigned char temp[8]={0},i; unsigned int a; setdataclock(1,0); //pull clock line low to inhibit communication delayus(100); //must be greater than 100us setdataclock(1,1); //release clock line, data line ready for input while(!rb6){} //wait for clock high for(a=0; a<100; a++) { if((!rb6)&&(!rb7)) //wait for data and clock to be low break; if(a==99) return 0; } for(i=0;i<8;i++) { while(!rb6){} //wait for clock high while(rb6){} //wait for clock low (falling edge); temp[i]=rb7; // store each bit } while(!rb6){} while(rb6){} while(!rb6){} while(rb6){} //wait for last 2 clock pulses (parity and stop) /* following statment combines the collected bits into byte*/ packet=128*temp[7]+64*temp[6]+32*temp[5]+16*temp[4]+8*temp[3]+4*temp[2]+2*temp[1]+ temp[0]; ps2_data_in=packet; return 1; } //function returns 0 if mouse initializes properly //returns 1 if mouse error (0xfc) is received //returns 2 if other code received char ps2_init() { char temp; //sr=4; //set default value host_to_mouse(0xff); //reset command while(!mouse_to_host()){} //mouse init results temp=ps2_data_in; while(!mouse_to_host()){} //mouse id if(temp==0xaa) //0xaa = mouse initialized ok (self test) { host_to_mouse(0xf3); host_to_mouse(10); host_to_mouse(0xf4);//enable data reporting, begin operation
}
} else if(temp==0xfc) return 1; else return 2; return 0;
//0xfc = mouse had init error //code other than 0xaa or 0xfc returned by mouse
void main() { portinit(); uart_init(); while(ps2_init()!=0){} //function returns 0 when init goes ok }
