Update BPM.c

BPM.c

@@ -1,9 +1,105 @@
+#include <stdint.h>
+#include "tm4c123gh6pm.h"
+
+// Function prototypes
+void Timer0A_Init(void);
+void ADC0_Init(void);
+void ADC0_Start(void);
 
 
-/**
- * main.c
- */
+uint32_t ADC0_Read(void);
+void Delay(uint32_t time);
+
+volatile uint32_t pulse_count = 0;
+volatile uint32_t pulse_detected = 0;
+
 int main(void)
 {
-	return 0;
+    Timer0A_Init(); // Initialize Timer0A for 1-minute interval
+    ADC0_Init();    // Initialize ADC0
+
+    while (1)
+    {
+        if (pulse_detected)
+            {
+                pulse_count++;  // Increment pulse count
+                pulse_detected = 0;
+            }
+    }
 }
+
+
+
+// Timer0A Initialization: Configures Timer0A to generate an interrupt every 1 minute
+void Timer0A_Init(void)
+    {
+        SYSCTL_RCGCTIMER_R |= 0x01;      // Enable clock to Timer0
+        TIMER0_CTL_R = 0;                // Disable Timer0A during configuration
+        TIMER0_CFG_R = 0;                // Set 32-bit timer configuration
+        TIMER0_TAMR_R = 0x02;            // Configure Timer0A in periodic mode
+        TIMER0_TAILR_R = 48000000 * 60;  // Load value for 1-minute interval
+        TIMER0_IMR_R |= 0x01;            // Enable Timer0A timeout interrupt
+        TIMER0_CTL_R |= 0x01;            // Enable Timer0A
+        NVIC_EN0_R |= (1 << 19);         // Enable IRQ19 for Timer0A
+    }
+
+// ADC0 Initialization: Configures ADC0 for single-channel, single-conversion
+void ADC0_Init(void)
+    {
+        SYSCTL_RCGCADC_R |= 0x01;         // Enable ADC0
+        SYSCTL_RCGCGPIO_R |= 0x10;        // Enable clock for Port E
+        GPIO_PORTE_AFSEL_R |= 0x08;       // Enable alternate function for PE3
+        GPIO_PORTE_DEN_R &= ~0x08;        // Disable digital I/O on PE3
+        GPIO_PORTE_AMSEL_R |= 0x08;       // Enable analog function on PE3
+        ADC0_ACTSS_R &= ~0x08;            // Disable SS3 during configuration
+        ADC0_EMUX_R &= ~0xF000;           // Configure SS3 for software trigger
+        ADC0_SSMUX3_R = 0;                // Set channel AIN0 (PE3)
+        ADC0_SSCTL3_R = 0x06;             // Set END0 and IE0 bits for single sample
+        ADC0_ACTSS_R |= 0x08;             // Enable SS3
+    }
+
+// Start ADC0 Conversion
+void ADC0_Start(void)
+    {
+        ADC0_PSSI_R |= 0x08;              // Initiate SS3
+    }
+
+
+// Read ADC0 Value
+uint32_t ADC0_Read(void)
+    {
+        while ((ADC0_RIS_R & 0x08) == 0); // Wait for conversion to complete
+        uint32_t result = ADC0_SSFIFO3_R & 0xFFF;  // Read 12-bit ADC result
+        ADC0_ISC_R = 0x08;                // Clear completion flag
+        return result;
+    }
+
+// Timer0A Interrupt Handler: Executes every 1 minute
+void Timer0A_Handler(void)
+    {
+        TIMER0_ICR_R = 0x01; // Clear the timer interrupt flag
+        pulse_count = 0;     // Reset pulse count for the next interval
+    }
+
+// Sample ADC and check for pulse presence
+void check_pulse(void)
+    {
+        ADC0_Start();
+        uint32_t adc_value = ADC0_Read();
+
+        // Convert ADC value to voltage (assuming 3.3V reference)
+        float voltage = (adc_value * 3.3) / 4095;
+
+        if (voltage >= 0.4 && voltage <= 0.6)
+        {
+            pulse_detected = 1; // Signal a valid pulse
+        }
+    }
+
+
+// Simple delay function
+void Delay(uint32_t time)
+    {
+        volatile uint32_t count;
+        for(count = 0; count < time; count++);
+    }