PWM the R_EXT of the LED driver using FTM.

2017-01-13 14:58:31 +01:00
parent 3348fb0848
commit 0ded50b43a
9 changed files with 93 additions and 14 deletions
@@ -0,0 +1,33 @@
+#include "led_pwm.h"
+#include "fsl_port.h"
+
+void LedPwm_Init() {
+    ftm_config_t ftmInfo;
+    ftm_chnl_pwm_signal_param_t ftmParam[] = {{
+            .chnlNumber = LED_PWM_FTM_CHANNEL,
+            .level = kFTM_LowTrue,
+            .dutyCyclePercent = 00,
+            .firstEdgeDelayPercent = 0
+    }};
+
+    CLOCK_EnableClock(LED_PWM_CLOCK);
+    PORT_SetPinMux(LED_PWM_PORT, LED_PWM_PIN, kPORT_MuxAlt4);
+
+    ftmParam[0].chnlNumber = (ftm_chnl_t)LED_PWM_FTM_CHANNEL;
+    ftmParam[0].level = kFTM_LowTrue;
+    ftmParam[0].dutyCyclePercent = INITIAL_DUTY_CYCLE_PERCENT - 100;
+    ftmParam[0].firstEdgeDelayPercent = 0;
+    FTM_GetDefaultConfig(&ftmInfo);
+
+    // Initializes the FTM module.
+    FTM_Init(LED_PWM_FTM_BASEADDR, &ftmInfo);
+    FTM_SetupPwm(LED_PWM_FTM_BASEADDR, ftmParam, sizeof(ftmParam),
+                 kFTM_EdgeAlignedPwm, FTM_PWM_FREQUENCY, FTM_SOURCE_CLOCK);
+    FTM_StartTimer(LED_PWM_FTM_BASEADDR, kFTM_SystemClock);
+}
+
+void LedPwm_SetBrightness(uint8_t brightnessPercent)
+{
+    FTM_UpdatePwmDutycycle(LED_PWM_FTM_BASEADDR, LED_PWM_FTM_CHANNEL, kFTM_EdgeAlignedPwm, brightnessPercent-100);
+    FTM_SetSoftwareTrigger(LED_PWM_FTM_BASEADDR, true);  // Triggers register update.
+}