Enabled lp_ticker after adjusting its implementation to the new API.

Author: anangl

hal/targets.json

@@ -1375,7 +1375,7 @@
         "supported_form_factors": ["ARDUINO"],
         "inherits": ["MCU_NRF51_32K"],
         "progen": {"target": "nrf51-dk"},
-        "device_has": ["ANALOGIN", "ERROR_PATTERN", "I2C", "I2C_ASYNCH", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPI_ASYNCH", "SPISLAVE"]
+        "device_has": ["ANALOGIN", "ERROR_PATTERN", "I2C", "I2C_ASYNCH", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPI_ASYNCH", "SPISLAVE"]
     },
     "NRF51_DK_BOOT": {
         "supported_form_factors": ["ARDUINO"],
@@ -1773,6 +1773,6 @@
             "NRF52_PAN_62",
             "NRF52_PAN_63"
         ],
-        "device_has": ["ANALOGIN", "ERROR_PATTERN", "I2C", "I2C_ASYNCH", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPI_ASYNCH", "SPISLAVE"]
+        "device_has": ["ANALOGIN", "ERROR_PATTERN", "I2C", "I2C_ASYNCH", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPI_ASYNCH", "SPISLAVE"]
     }
 }

hal/targets/hal/TARGET_NORDIC/TARGET_NRF5/common_rtc.h

@@ -50,5 +50,8 @@ extern uint32_t volatile m_common_rtc_overflows;
 
 void     common_rtc_init(void);
 uint32_t common_rtc_32bit_ticks_get(void);
+uint64_t common_rtc_64bit_us_get(void);
+void     common_rtc_set_interrupt(uint32_t us_timestamp, uint32_t cc_channel,
+                                  uint32_t int_mask);
 
 #endif // COMMON_RTC_H

hal/targets/hal/TARGET_NORDIC/TARGET_NRF5/lp_ticker.c

@@ -18,43 +18,32 @@
 #if DEVICE_LOWPOWERTIMER
 
 #include "common_rtc.h"
-#include "sleep_api.h"
 
 void lp_ticker_init(void)
 {
     common_rtc_init();
 }
 
-uint32_t lp_ticker_read(void)
+uint32_t lp_ticker_read()
 {
-    return common_rtc_32bit_ticks_get();
+    return (uint32_t)common_rtc_64bit_us_get();
 }
 
-void lp_ticker_set_interrupt(uint32_t now, uint32_t time)
+void lp_ticker_set_interrupt(timestamp_t timestamp)
 {
-    (void)now;
-    nrf_rtc_cc_set(COMMON_RTC_INSTANCE, LP_TICKER_CC_CHANNEL, RTC_WRAP(time));
-    nrf_rtc_event_enable(COMMON_RTC_INSTANCE, LP_TICKER_INT_MASK);
+    common_rtc_set_interrupt(timestamp,
+        LP_TICKER_CC_CHANNEL, LP_TICKER_INT_MASK);
 }
 
-uint32_t lp_ticker_get_overflows_counter(void)
+void lp_ticker_disable_interrupt(void)
 {
-    // Cut out the part of 'm_common_rtc_overflows' used by
-    // 'common_rtc_32bit_ticks_get()'.
-    return (m_common_rtc_overflows >> (32u - RTC_COUNTER_BITS));
+    nrf_rtc_event_disable(COMMON_RTC_INSTANCE, LP_TICKER_INT_MASK);
 }
 
-uint32_t lp_ticker_get_compare_match(void)
+void lp_ticker_clear_interrupt(void)
 {
-    return nrf_rtc_cc_get(COMMON_RTC_INSTANCE, LP_TICKER_CC_CHANNEL);
-}
-
-void lp_ticker_sleep_until(uint32_t now, uint32_t time)
-{
-    lp_ticker_set_interrupt(now, time);
-    sleep_t sleep_obj;
-    mbed_enter_sleep(&sleep_obj);
-    mbed_exit_sleep(&sleep_obj);
+    // No implementation needed. The event that triggers the interrupt is
+    // cleared in 'common_rtc_irq_handler'.
 }
 
 #endif // DEVICE_LOWPOWERTIMER

hal/targets/hal/TARGET_NORDIC/TARGET_NRF5/us_ticker.c

@@ -16,6 +16,7 @@
 #include "us_ticker_api.h"
 #include "common_rtc.h"
 #include "app_util.h"
+#include "lp_ticker_api.h"
 
 
 //------------------------------------------------------------------------------
@@ -51,6 +52,8 @@ void COMMON_RTC_IRQ_HANDLER(void)
     if (nrf_rtc_event_pending(COMMON_RTC_INSTANCE, event)) {
         nrf_rtc_event_clear(COMMON_RTC_INSTANCE, event);
         nrf_rtc_event_disable(COMMON_RTC_INSTANCE, int_mask);
+
+        lp_ticker_irq_handler();
     }
 #endif
 
@@ -128,27 +131,16 @@ uint32_t common_rtc_32bit_ticks_get(void)
     ticks += (m_common_rtc_overflows << RTC_COUNTER_BITS);
     return ticks;
 }
-//------------------------------------------------------------------------------
-
-
-void us_ticker_init(void)
-{
-    common_rtc_init();
-}
 
-static uint64_t us_ticker_64bit_get(void)
+uint64_t common_rtc_64bit_us_get(void)
 {
     uint32_t ticks = common_rtc_32bit_ticks_get();
     // [ticks -> microseconds]
     return ROUNDED_DIV(((uint64_t)ticks) * 1000000, RTC_INPUT_FREQ);
 }
 
-uint32_t us_ticker_read()
-{
-    return (uint32_t)us_ticker_64bit_get();
-}
-
-void us_ticker_set_interrupt(timestamp_t timestamp)
+void common_rtc_set_interrupt(uint32_t us_timestamp, uint32_t cc_channel,
+                              uint32_t int_mask)
 {
     // The internal counter is clocked with a frequency that cannot be easily
     // multiplied to 1 MHz, therefore besides the translation of values
@@ -159,12 +151,13 @@ void us_ticker_set_interrupt(timestamp_t timestamp)
     // is then translated to counter ticks. Finally, the lower 24 bits of thus
     // calculated value is written to the counter compare register to prepare
     // the interrupt generation.
-    uint64_t current_time64 = us_ticker_64bit_get();
+    uint64_t current_time64 = common_rtc_64bit_us_get();
     // [add upper 32 bits from the current time to the timestamp value]
-    uint64_t timestamp64 = timestamp + (current_time64 & ~(uint64_t)0xFFFFFFFF);
+    uint64_t timestamp64 = us_timestamp +
+        (current_time64 & ~(uint64_t)0xFFFFFFFF);
     // [if the original timestamp value happens to be after the 32 bit counter
     //  of microsends overflows, correct the upper 32 bits accordingly]
-    if (timestamp < (uint32_t)(current_time64 & 0xFFFFFFFF)) {
+    if (us_timestamp < (uint32_t)(current_time64 & 0xFFFFFFFF)) {
         timestamp64 += ((uint64_t)1 << 32);
     }
     // [microseconds -> ticks, always round the result up to avoid too early
@@ -182,9 +175,26 @@ void us_ticker_set_interrupt(timestamp_t timestamp)
         compare_value = closest_safe_compare;
     }
 
-    nrf_rtc_cc_set(COMMON_RTC_INSTANCE, US_TICKER_CC_CHANNEL,
-        RTC_WRAP(compare_value));
-    nrf_rtc_event_enable(COMMON_RTC_INSTANCE, US_TICKER_INT_MASK);
+    nrf_rtc_cc_set(COMMON_RTC_INSTANCE, cc_channel, RTC_WRAP(compare_value));
+    nrf_rtc_event_enable(COMMON_RTC_INSTANCE, int_mask);
+}
+//------------------------------------------------------------------------------
+
+
+void us_ticker_init(void)
+{
+    common_rtc_init();
+}
+
+uint32_t us_ticker_read()
+{
+    return (uint32_t)common_rtc_64bit_us_get();
+}
+
+void us_ticker_set_interrupt(timestamp_t timestamp)
+{
+    common_rtc_set_interrupt(timestamp,
+        US_TICKER_CC_CHANNEL, US_TICKER_INT_MASK);
 }
 
 void us_ticker_disable_interrupt(void)