From 2dcbdfe198fe21956aaee154747a56a7250901ef Mon Sep 17 00:00:00 2001
From: Yuval Adam <yuv.adm@gmail.com>
Date: Thu, 1 Nov 2012 21:20:41 +0200
Subject: Implemented PWM on project1

---
 boards/ek-lm4f120xl/project1/project1.c | 44 +++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 boards/ek-lm4f120xl/project1/project1.c

(limited to 'boards/ek-lm4f120xl/project1/project1.c')

diff --git a/boards/ek-lm4f120xl/project1/project1.c b/boards/ek-lm4f120xl/project1/project1.c
new file mode 100644
index 0000000..86290df
--- /dev/null
+++ b/boards/ek-lm4f120xl/project1/project1.c
@@ -0,0 +1,44 @@
+#include "inc/hw_types.h"
+#include "inc/hw_memmap.h"
+
+#include "driverlib/sysctl.h"
+#include "driverlib/gpio.h"
+#include "driverlib/timer.h"
+#include "driverlib/pin_map.h"
+
+int main(void) {
+    unsigned long ulPeriod, dutyCycle;
+
+    // 40 MHz system clock
+    SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|
+        SYSCTL_XTAL_16MHZ|SYSCTL_OSC_MAIN);
+
+    ulPeriod = 100000;
+    dutyCycle = 25000;
+
+    // Turn off LEDs
+    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
+    GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);
+    GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3, 0);
+
+    // Configure PB6 as T0CCP0
+    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
+    GPIOPinConfigure(GPIO_PB6_T0CCP0);
+    GPIOPinTypeTimer(GPIO_PORTB_BASE, GPIO_PIN_6);
+
+    // Configure timer
+    SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
+    TimerConfigure(TIMER0_BASE, TIMER_CFG_SPLIT_PAIR|TIMER_CFG_A_PWM);
+    TimerLoadSet(TIMER0_BASE, TIMER_A, ulPeriod -1);
+    TimerMatchSet(TIMER0_BASE, TIMER_A, dutyCycle); // PWM
+    TimerEnable(TIMER0_BASE, TIMER_A);
+
+    while(1) { // The following code varies the duty cycle over time
+        TimerMatchSet(TIMER0_BASE, TIMER_A, dutyCycle++);
+
+        if(dutyCycle >= ulPeriod - 1)
+            dutyCycle = 0;
+
+        SysCtlDelay(50000);
+    }
+}
-- 
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