mbed-os v5.9 LPTICKER implementation

targets/TARGET_Maxim/TARGET_MAX32620C/rtc_api.c

@@ -147,14 +147,23 @@ time_t rtc_read(void)
 //******************************************************************************
 void lp_ticker_init(void)
 {
-    if (lp_ticker_inited) {
+    RTC_DisableINT(MXC_F_RTC_INTEN_COMP0);
-        return;
-    }
-
     NVIC_SetVector(RTC0_IRQn, (uint32_t)lp_ticker_irq_handler);
     NVIC_EnableIRQ(RTC0_IRQn);
     init_rtc();
-    lp_ticker_inited = 1;
+}
+
+//******************************************************************************
+void lp_ticker_free(void)
+{
+    // Disable interrupt associated with LPTICKER API
+    RTC_DisableINT(MXC_F_RTC_INTEN_COMP0);
+
+    // RTC hardware is shared by LPTICKER and RTC APIs.
+    // Prior initialization of the RTC API gates disabling the RTC hardware.
+    if (!(MXC_RTCTMR->inten & MXC_F_RTC_INTEN_OVERFLOW)) {
+        RTC_Stop();
+    }
 }
 
 //******************************************************************************
@@ -167,13 +176,13 @@ uint32_t lp_ticker_read(void)
 void lp_ticker_set_interrupt(timestamp_t timestamp)
 {
     MXC_RTCTMR->comp[0] = timestamp;
-    MXC_RTCTMR->flags = MXC_F_RTC_FLAGS_ASYNC_CLR_FLAGS;
+    MXC_RTCTMR->flags = MXC_F_RTC_FLAGS_COMP0;
-    MXC_RTCTMR->inten |= MXC_F_RTC_INTEN_COMP0;
+    RTC_EnableINT(MXC_F_RTC_INTEN_COMP0);
 
-    // Enable wakeup from RTC compare 0
+    // Enable as LP wakeup source
-    LP_ConfigRTCWakeUp(1, 0, 0, rtc_inited);
+    MXC_PWRSEQ->msk_flags |= MXC_F_PWRSEQ_FLAGS_RTC_CMPR0;
 
-    // Wait for pending transactions
+    // Postponed write pending wait for comp0 and flags
     while (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
 }
 
@@ -186,7 +195,7 @@ void lp_ticker_disable_interrupt(void)
 //******************************************************************************
 void lp_ticker_clear_interrupt(void)
 {
-    RTC_ClearFlags(MXC_F_RTC_FLAGS_ASYNC_CLR_FLAGS);
+    RTC_ClearFlags(MXC_F_RTC_FLAGS_COMP0);
 }
 
 //******************************************************************************

targets/TARGET_Maxim/TARGET_MAX32625/rtc_api.c

@@ -147,14 +147,23 @@ time_t rtc_read(void)
 //******************************************************************************
 void lp_ticker_init(void)
 {
-    if (lp_ticker_inited) {
+    RTC_DisableINT(MXC_F_RTC_INTEN_COMP0);
-        return;
-    }
-
     NVIC_SetVector(RTC0_IRQn, (uint32_t)lp_ticker_irq_handler);
     NVIC_EnableIRQ(RTC0_IRQn);
     init_rtc();
-    lp_ticker_inited = 1;
+}
+
+//******************************************************************************
+void lp_ticker_free(void)
+{
+    // Disable interrupt associated with LPTICKER API
+    RTC_DisableINT(MXC_F_RTC_INTEN_COMP0);
+
+    // RTC hardware is shared by LPTICKER and RTC APIs.
+    // Prior initialization of the RTC API gates disabling the RTC hardware.
+    if (!(MXC_RTCTMR->inten & MXC_F_RTC_INTEN_OVERFLOW)) {
+        RTC_Stop();
+    }
 }
 
 //******************************************************************************
@@ -167,13 +176,13 @@ uint32_t lp_ticker_read(void)
 void lp_ticker_set_interrupt(timestamp_t timestamp)
 {
     MXC_RTCTMR->comp[0] = timestamp;
-    MXC_RTCTMR->flags = MXC_F_RTC_FLAGS_ASYNC_CLR_FLAGS;
+    MXC_RTCTMR->flags = MXC_F_RTC_FLAGS_COMP0;
-    MXC_RTCTMR->inten |= MXC_F_RTC_INTEN_COMP0;
+    RTC_EnableINT(MXC_F_RTC_INTEN_COMP0);
 
-    // Enable wakeup from RTC compare 0
+    // Enable as LP wakeup source
-    LP_ConfigRTCWakeUp(1, 0, 0, rtc_inited);
+    MXC_PWRSEQ->msk_flags |= MXC_F_PWRSEQ_FLAGS_RTC_CMPR0;
 
-    // Wait for pending transactions
+    // Postponed write pending wait for comp0 and flags
     while (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
 }
 
@@ -186,7 +195,7 @@ void lp_ticker_disable_interrupt(void)
 //******************************************************************************
 void lp_ticker_clear_interrupt(void)
 {
-    RTC_ClearFlags(MXC_F_RTC_FLAGS_ASYNC_CLR_FLAGS);
+    RTC_ClearFlags(MXC_F_RTC_FLAGS_COMP0);
 }
 
 //******************************************************************************

targets/TARGET_Maxim/TARGET_MAX32630/rtc_api.c

@@ -109,8 +109,8 @@ void rtc_free(void)
         if (lp_ticker_inited) {
             RTC_DisableINT(MXC_F_RTC_FLAGS_OVERFLOW);
         } else {
-        MXC_RTCTMR->ctrl |= MXC_F_RTC_CTRL_CLEAR;
+            MXC_RTCTMR->ctrl |= MXC_F_RTC_CTRL_CLEAR;
-        RTC_Stop();
+            RTC_Stop();
         }
     }
 }
@@ -147,14 +147,23 @@ time_t rtc_read(void)
 //******************************************************************************
 void lp_ticker_init(void)
 {
-    if (lp_ticker_inited) {
+    RTC_DisableINT(MXC_F_RTC_INTEN_COMP0);
-        return;
-    }
-
     NVIC_SetVector(RTC0_IRQn, (uint32_t)lp_ticker_irq_handler);
     NVIC_EnableIRQ(RTC0_IRQn);
     init_rtc();
-    lp_ticker_inited = 1;
+}
+
+//******************************************************************************
+void lp_ticker_free(void)
+{
+    // Disable interrupt associated with LPTICKER API
+    RTC_DisableINT(MXC_F_RTC_INTEN_COMP0);
+
+    // RTC hardware is shared by LPTICKER and RTC APIs.
+    // Prior initialization of the RTC API gates disabling the RTC hardware.
+    if (!(MXC_RTCTMR->inten & MXC_F_RTC_INTEN_OVERFLOW)) {
+        RTC_Stop();
+    }
 }
 
 //******************************************************************************
@@ -167,13 +176,13 @@ uint32_t lp_ticker_read(void)
 void lp_ticker_set_interrupt(timestamp_t timestamp)
 {
     MXC_RTCTMR->comp[0] = timestamp;
-    MXC_RTCTMR->flags = MXC_F_RTC_FLAGS_ASYNC_CLR_FLAGS;
+    MXC_RTCTMR->flags = MXC_F_RTC_FLAGS_COMP0;
-    MXC_RTCTMR->inten |= MXC_F_RTC_INTEN_COMP0;
+    RTC_EnableINT(MXC_F_RTC_INTEN_COMP0);
 
-    // Enable wakeup from RTC compare 0
+    // Enable as LP wakeup source
-    LP_ConfigRTCWakeUp(1, 0, 0, rtc_inited);
+    MXC_PWRSEQ->msk_flags |= MXC_F_PWRSEQ_FLAGS_RTC_CMPR0;
 
-    // Wait for pending transactions
+    // Postponed write pending wait for comp0 and flags
     while (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
 }
 
@@ -186,7 +195,7 @@ void lp_ticker_disable_interrupt(void)
 //******************************************************************************
 void lp_ticker_clear_interrupt(void)
 {
-    RTC_ClearFlags(MXC_F_RTC_FLAGS_ASYNC_CLR_FLAGS);
+    RTC_ClearFlags(MXC_F_RTC_FLAGS_COMP0);
 }
 
 //******************************************************************************

targets/targets.json

@@ -2858,7 +2858,7 @@
         "macros": ["TARGET=MAX32625","TARGET_REV=0x4132", "OPEN_DRAIN_LEDS"],
         "extra_labels": ["Maxim", "MAX32625"],
         "supported_toolchains": ["GCC_ARM", "IAR", "ARM"],
-        "device_has": ["ANALOGIN", "I2C", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "STDIO_MESSAGES", "USTICKER"],
+        "device_has": ["ANALOGIN", "I2C", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "STDIO_MESSAGES", "USTICKER"],
         "release_versions": ["2", "5"],
         "public": false
     },
@@ -2893,9 +2893,9 @@
         "macros": ["__SYSTEM_HFX=96000000", "TARGET=MAX32630", "TARGET_REV=0x4132", "BLE_HCI_UART", "OPEN_DRAIN_LEDS"],
         "extra_labels": ["Maxim", "MAX32630"],
         "supported_toolchains": ["GCC_ARM", "IAR", "ARM"],
-        "device_has": ["ANALOGIN", "I2C", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "STDIO_MESSAGES", "USTICKER"],
+        "device_has": ["ANALOGIN", "I2C", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "STDIO_MESSAGES", "USTICKER"],
         "features": ["BLE"],
-        "release_versions": []
+        "release_versions": ["2", "5"]
     },
     "EFM32": {
         "inherits": ["Target"],