Silicon Laboratories Stepper Machine Bedienungsanleitung PDF herunterladen (Seite 27)

AN155

Rev. 1.1 27

// PORT_Init

//-----------------------------------------------------------------------------

// Configure the Crossbar and GPIO ports.

// P0.0 - A+

// P0.1 - A-

// P0.2 - B+

// P0.3 - B-

// P0.4 - Txd

// P0.5 - Rxd

// P0.6 - LED

// P0.7 - C2D/Switch

void PORT_Init (void)

{

XBR0 = 0x4F; // Crossbar Register 1

XBR1 = 0x03; // Crossbar Register 2

XBR2 = 0x40; // Crossbar Register 3

P0 = 0xC0; // Turn off MOSFETs, Set P0.6 & P0.7

P0MDOUT = 0x5F; // Output configuration for P0

P0MDIN = 0xFF; // Input configuration for P0

IP = 0x02; // T0 high priority, others low

IT01CF = 0x70; // use P0.7 for INT1

IT1 = 1; // edge sensitive interrupt

IE1 = 0; // clear external interrupt

EX1 = 1; // enable external interrupt 1

}

//-----------------------------------------------------------------------------

void Timer_Init (void)

{

CKCON = 0x12; // T1 uses sysclk, T0 uses /48,

TMOD = 0x21; // T1 mode 2, T0 mode 1

}

//-----------------------------------------------------------------------------

void UART_Init(void)

{

SCON0 = 0x10; // mode 1, 8-bit UART, disable receiver

TH1 = 0x2C; // set Timer1 reload value for 57600

TR1 = 1; // start Timer1

TX_Idle = 1; // set idle flag

readClear(); // zero out read buffer

writeClear(); // zero out write buffer

ES0 = 1; // enable UART interrupt

}

//-----------------------------------------------------------------------------

void Motor_Init()

{

Tzero = INIT_TZERO; // initialize acceleration

Position = 0x0000; // zero position

LED = OFF; // turn off LED

doneFlag = 0; // clear done flag

}

//-----------------------------------------------------------------------------

void error (void) // used by main

{

newline();

puts("invalid character"); // display error message

newline();

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