diff options
| author | Yuval Adam <yuv.adm@gmail.com> | 2012-11-01 21:20:41 +0200 |
|---|---|---|
| committer | Yuval Adam <yuv.adm@gmail.com> | 2012-11-01 21:20:41 +0200 |
| commit | 2dcbdfe198fe21956aaee154747a56a7250901ef (patch) | |
| tree | 42f195609122dd841ffe5095331901f4398b62b0 /boards/ek-lm4f120xl/project1/project1.c | |
| parent | 10c808ddff4754809b13b2934b3d0db392d311de (diff) | |
Implemented PWM on project1
Diffstat (limited to 'boards/ek-lm4f120xl/project1/project1.c')
| -rw-r--r-- | boards/ek-lm4f120xl/project1/project1.c | 44 |
1 files changed, 44 insertions, 0 deletions
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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