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// Lösung zur Aufgabe Termin4 // Aufgabe 4 //**************************** // Zeiger auf Peripherie // Messen der aufgelegten Masse // // von: Manfred Pester // vom: 06. August 2003 #include "../h/pio.h" #include "../h/tc.h" #include "../h/pmc.h" // für die Initialisierung der Zähler #define TC_INIT TC_CLKS_MCK2 | TC_LDBSTOP | TC_CAPT | TC_LDRA_RISING_EDGE | TC_LDRB_RISING_EDGE // Teiler 32? int MessungderMasse(void); void PIO_Init(void) { StructPMC* pmcbase = PMC_BASE; StructPIO* piobaseA = PIOA_BASE; StructPIO* piobaseB = PIOB_BASE; pmcbase->PMC_PCER = 0x6000; // PIOA, PIOB piobaseA->PIO_PDR = 0x090; // p4 p7 } void Timer_Init(void) { StructPMC* pmcbase = PMC_BASE; StructTC* tcbase4 = TCB4_BASE; StructTC* tcbase5 = TCB5_BASE; pmcbase->PMC_PCER = 0x00f00; // Clock Timer5, Timer4 einschalten // Timer4: tcbase4->TC_CCR = TC_CLKDIS; // CCR= CounterControlRegister; TC_CLKDIS=0x2 tcbase4->TC_CMR = TC_INIT; // Timer Counter Mode Register tcbase4->TC_CCR = TC_CLKEN; // 0x1 tcbase4->TC_CCR = TC_SWTRG; // 0x4 // Timer5: tcbase5->TC_CCR = TC_CLKDIS; // CCR= CounterControlRegister; TC_CLKDIS=0x2 tcbase5->TC_CMR = TC_INIT; // Timer Counter Mode Register tcbase5->TC_CCR = TC_CLKEN; // 0x1 tcbase5->TC_CCR = TC_SWTRG; // 0x4 } int main(void) { StructPIO* piobaseB = PIOB_BASE; volatile int Masse = 0; PIO_Init(); Timer_Init(); int i=0; while(i < 4){ Masse = Masse + MessungderMasse(); i++; } Masse = Masse >> 2; return 0; } int MessungderMasse(void){ StructPMC* pmcbase = PMC_BASE; StructPIO* piobaseA = PIOA_BASE; StructPIO* piobaseB = PIOB_BASE; StructTC* tcbase4 = TCB4_BASE; StructTC* tcbase5 = TCB5_BASE; volatile int captureRA1; volatile int captureRB1; volatile int capturediff1; volatile float Periodendauer1; volatile int captureRA2; volatile int captureRB2; volatile int capturediff2; volatile float Periodendauer2; // Periodendauer der Waagensignale messen // Signal an TIOA4 ca. 16kHz entspricht ca. einer Periodendauer von 62,5us // durch den Teiler von 32 ergeben sich ca. 2ms // Zähler mit positiver Flanke starten tcbase4->TC_CCR = TC_SWTRG; tcbase5->TC_CCR = TC_SWTRG; while (!( tcbase4->TC_SR & 0x40)); // Capture Register B wurde geladen (RB Loading Status) Messung abgeschlossen captureRA1 = tcbase4->TC_RA; // Speichert TC_RA (1. Gemesser wert) in Variable captureRB1 = tcbase4->TC_RB; while (!( tcbase5->TC_SR & 0x40)); // Capture Register B wurde geladen (Messung abgeschlossen captureRA2 = tcbase5->TC_RA; captureRB2 = tcbase5->TC_RB; capturediff2 = captureRB2 - captureRA2; Periodendauer2 = capturediff2; // Zeit in us capturediff1 = captureRB1 - captureRA1; Periodendauer1 = capturediff1; // Zeit in us volatile int masse; volatile int C1 = 2000; volatile int C2 = 0; masse = (C1 * ((Periodendauer1/Periodendauer2)-1))-C2; return masse; }

A PHP Error was encountered

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Message: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior

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