MCUXpresso: Enable RTC on LPC54114 and LPC546XX

Signed-off-by: Mahesh Mahadevan <[email protected]>

Author: mmahadevan108

targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC/rtc_api.c

@@ -15,14 +15,16 @@
  */
 #include "rtc_api.h"
 
-#if DEVICE_RTC
+#if DEVICE_RTC || DEVICE_LOWPOWERTIMER
 
 #include "pinmap.h"
 #include "fsl_rtc.h"
 #include "PeripheralPins.h"
 
 extern void rtc_setup_oscillator(void);
 
+static bool rtc_time_set = false;
+
 void rtc_init(void)
 {
     rtc_setup_oscillator();
@@ -34,7 +36,10 @@ void rtc_init(void)
 
 void rtc_free(void)
 {
-    RTC_Deinit(RTC);
+#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
+    /* Gate the module clock */
+    CLOCK_DisableClock(kCLOCK_Rtc);
+#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
 }
 
 /*
@@ -43,8 +48,19 @@ void rtc_free(void)
  */
 int rtc_isenabled(void)
 {
+#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
+    /* Enable the RTC peripheral clock */
     CLOCK_EnableClock(kCLOCK_Rtc);
-    return (int)((RTC->CTRL & RTC_CTRL_RTC_EN_MASK) >> RTC_CTRL_RTC_EN_SHIFT);
+#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
+
+    const bool rtc_init_done = ((RTC->CTRL & RTC_CTRL_RTC_EN_MASK) >> RTC_CTRL_RTC_EN_SHIFT);
+
+    /* If RTC is not initialized, then disable the clock gate on exit. */
+    if(!rtc_init_done) {
+        rtc_free();
+    }
+
+    return (rtc_init_done & rtc_time_set);
 }
 
 time_t rtc_read(void)
@@ -57,6 +73,8 @@ void rtc_write(time_t t)
     RTC_StopTimer(RTC);
     RTC->COUNT = t;
     RTC_StartTimer(RTC);
+
+    rtc_time_set = true;
 }
 
 #endif

targets/targets.json

@@ -766,7 +766,7 @@
         "macros": ["CPU_LPC54114J256BD64_cm4", "FSL_RTOS_MBED"],
         "inherits": ["Target"],
         "detect_code": ["1054"],
-        "device_has": ["USTICKER", "ANALOGIN", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES", "FLASH"],
+        "device_has": ["USTICKER", "RTC", "ANALOGIN", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES", "FLASH"],
         "release_versions": ["2", "5"],
         "device_name" : "LPC54114J256BD64"
     },
@@ -777,7 +777,7 @@
         "is_disk_virtual": true,
         "macros": ["CPU_LPC54628J512ET180", "FSL_RTOS_MBED"],
         "inherits": ["Target"],
-        "device_has": ["USTICKER", "ANALOGIN", "EMAC", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES", "FLASH", "TRNG"],
+        "device_has": ["USTICKER", "RTC", "ANALOGIN", "EMAC", "I2C", "I2CSLAVE", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "SERIAL", "SLEEP", "SPI", "SPISLAVE", "STDIO_MESSAGES", "FLASH", "TRNG"],
         "features": ["LWIP"],
         "device_name" : "LPC54628J512ET180",
         "overrides": {