Merge pull request #7998 from NXPmicro/MIMXRT1050_Add_RTC

MIMXRT1050_EVK: Add RTC support

Author: 0xc0170

targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_IMX/rtc_api.c

@@ -17,21 +17,26 @@
 
 #if DEVICE_RTC
 
-#include "fsl_snvs_hp.h"
+#include "fsl_snvs_lp.h"
+
+static bool rtc_time_set = false;
 
 void rtc_init(void)
 {
-    snvs_hp_rtc_config_t snvsRtcConfig;
+    snvs_lp_srtc_config_t snvsRtcConfig;
 
-    SNVS_HP_RTC_GetDefaultConfig(&snvsRtcConfig);
-    SNVS_HP_RTC_Init(SNVS, &snvsRtcConfig);
+    SNVS_LP_SRTC_GetDefaultConfig(&snvsRtcConfig);
+    SNVS_LP_SRTC_Init(SNVS, &snvsRtcConfig);
 
-    SNVS_HP_RTC_StartTimer(SNVS);
+    SNVS_LP_SRTC_StartTimer(SNVS);
 }
 
 void rtc_free(void)
 {
-    SNVS_HP_RTC_Deinit(SNVS);
+#if (!(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && \
+         defined(SNVS_LP_CLOCKS))
+    CLOCK_DisableClock(kCLOCK_SnvsLp0);
+#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
 }
 
 /*
@@ -40,19 +45,31 @@ void rtc_free(void)
  */
 int rtc_isenabled(void)
 {
-    return (int)((SNVS->HPCR & SNVS_HPCR_RTC_EN_MASK) >> SNVS_HPCR_RTC_EN_SHIFT);
+#if (!(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && \
+         defined(SNVS_LP_CLOCKS))
+    CLOCK_EnableClock(kCLOCK_SnvsLp0);
+#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
+
+
+    const bool rtc_init_done = ((SNVS->LPCR & SNVS_LPCR_SRTC_ENV_MASK) >> SNVS_LPCR_SRTC_ENV_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)
 {
-    uint64_t seconds = 0;
-    uint64_t tmp = 0;
+    uint32_t seconds = 0;
+    uint32_t tmp = 0;
 
     /* Do consecutive reads until value is correct */
-    do
-    {
+    do {
         seconds = tmp;
-        tmp = SNVS->HPRTCLR;
+        tmp = (SNVS->LPSRTCMR << 17U) | (SNVS->LPSRTCLR >> 15U);
     } while (tmp != seconds);
 
     return (time_t)seconds;
@@ -63,11 +80,15 @@ void rtc_write(time_t t)
     if (t == 0) {
         t = 1;
     }
-    SNVS_HP_RTC_StopTimer(SNVS);
 
-    SNVS->HPRTCLR = (uint32_t)t;
+    SNVS_LP_SRTC_StopTimer(SNVS);
+
+    SNVS->LPSRTCMR = (uint32_t)(t >> 17U);
+    SNVS->LPSRTCLR = (uint32_t)(t << 15U);
+
+    SNVS_LP_SRTC_StartTimer(SNVS);
 
-    SNVS_HP_RTC_StartTimer(SNVS);
+    rtc_time_set = true;
 }
 
 #endif

targets/targets.json

@@ -766,7 +766,7 @@
         "macros": ["CPU_MIMXRT1052DVL6B", "FSL_RTOS_MBED", "XIP_BOOT_HEADER_ENABLE=1", "XIP_EXTERNAL_FLASH=1", "XIP_BOOT_HEADER_DCD_ENABLE=1", "SKIP_SYSCLK_INIT"],
         "inherits": ["Target"],
         "detect_code": ["0227"],
-        "device_has": ["SLEEP", "USTICKER", "LPTICKER", "ANALOGIN", "I2C", "I2CSLAVE", "ERROR_RED", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "SERIAL", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
+        "device_has": ["RTC", "SLEEP", "USTICKER", "LPTICKER", "ANALOGIN", "I2C", "I2CSLAVE", "ERROR_RED", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "SERIAL", "SPI", "SPISLAVE", "STDIO_MESSAGES"],
         "release_versions": ["2", "5"],
         "device_name": "MIMXRT1052"
     },