Final version of MeasurementOfDistance.c

Labware/Lab14_MeasurementOfDistance/MeasurementOfDistance.c

@@ -50,16 +50,40 @@ unsigned long Flag;       // 1 means valid Distance, 0 means Distance is empty
 // Input: sample  12-bit ADC sample
 // Output: 32-bit distance (resolution 0.001cm)
 unsigned long Convert(unsigned long sample){
-  return 0;  // replace this line with real code
+  return (2 * 1000 * sample) / 4095.0;  // replace this line with real code
 }
 
 // Initialize SysTick interrupts to trigger at 40 Hz, 25 ms
 void SysTick_Init(unsigned long period){
+	NVIC_ST_CTRL_R = 0;
+	NVIC_ST_RELOAD_R = period;
+	NVIC_ST_CURRENT_R = 0;
+	NVIC_SYS_PRI3_R = (NVIC_SYS_PRI3_R&0x00FFFFFF)|0x40000000;
+	NVIC_ST_CTRL_R = 0x00000007;
 
 }
+
+unsigned long PF1_Configure(void){
+	unsigned long volatile delay;
+  SYSCTL_RCGC2_R |= 0x00000020; // activate port A
+  delay = SYSCTL_RCGC2_R;       //
+  GPIO_PORTF_AMSEL_R &= ~0x02;  // no analog
+  GPIO_PORTF_PCTL_R &= ~0x00000F0; // regular function
+  GPIO_PORTF_DIR_R |= 0x02;     // make PA2 out
+  GPIO_PORTF_PDR_R |= 0x02;     // make PA2 out
+  GPIO_PORTF_DR8R_R |= 0x02;    // can drive up to 8mA out
+  GPIO_PORTF_AFSEL_R &= ~0x02;  // disable alt funct on PA5
+  GPIO_PORTF_DEN_R |= 0x02;     // enable digital I/O on PA5
+	return 0;
+}
+
 // executes every 25 ms, collects a sample, converts and stores in mailbox
 void SysTick_Handler(void){
-
+	//GPIO_PORTF_DATA_R ^= 0x02;
+	ADCdata = ADC0_In();
+	Distance = Convert(ADCdata);
+	Flag = 1;
+	//GPIO_PORTF_DATA_R ^= 0x02;
 }
 
 //-----------------------UART_ConvertDistance-----------------------
@@ -74,8 +98,24 @@ void SysTick_Handler(void){
 // 2210 to "2.210 cm"
 //10000 to "*.*** cm"  any value larger than 9999 converted to "*.*** cm"
 void UART_ConvertDistance(unsigned long n){
-// as part of Lab 11 you implemented this function
-
+	// as part of Lab 11 you implemented this function
+	if(n < 10000) {
+		String[0] = n/1000 + 0x30;
+		String[1] = '.';
+		String[2] = (n/100)%10 + 0x30;
+		String[3] = (n/10)%10 + 0x30;
+		String[4] = n%10 + 0x30;
+	} else {
+    String[0] = '*';
+    String[1] = '.';
+    String[2] = '*';
+    String[3] = '*';
+    String[4] = '*';
+  }
+  String[5] = ' ';
+  String[6] = 'c';
+  String[7] = 'm';
+  String[8] = 0;
 }
 
 // main1 is a simple main program allowing you to debug the ADC interface
@@ -106,16 +146,28 @@ int main2(void){
 int main(void){ 
   volatile unsigned long delay;
   TExaS_Init(ADC0_AIN1_PIN_PE2, SSI0_Real_Nokia5110_Scope);
-// initialize ADC0, channel 1, sequencer 3
-// initialize Nokia5110 LCD (optional)
-// initialize SysTick for 40 Hz interrupts
-// initialize profiling on PF1 (optional)
-                                    //    wait for clock to stabilize
+	// initialize ADC0, channel 1, sequencer 3
+	ADC0_Init();
+	// initialize Nokia5110 LCD (optional)
+	Nokia5110_Init();
+	// initialize SysTick for 40 Hz interrupts
+	SysTick_Init(1999999);
+	// initialize profiling on PF1 (optional)
+	PF1_Configure();
 
   EnableInterrupts();
 // print a welcome message  (optional)
+	Nokia5110_Clear();
+	//Nokia5110_SetCursor(0, 0);
+	Nokia5110_OutString((unsigned char *)"");
   while(1){ 
 // read mailbox
 // output to Nokia5110 LCD (optional)
+		if(Flag) {
+			UART_ConvertDistance(Distance);
+			Nokia5110_SetCursor(0, 0);
+			Nokia5110_OutString(String);
+			Flag = 0;
+		}
   }
 }