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-rw-r--r--os/hal/ports/NRF51/NRF51822/hal_lld.c16
-rw-r--r--os/hal/ports/NRF51/NRF51822/hal_lld.h24
-rw-r--r--os/hal/ports/NRF51/NRF51822/st_lld.c58
-rw-r--r--os/hal/ports/NRF51/NRF51822/st_lld.h25
4 files changed, 109 insertions, 14 deletions
diff --git a/os/hal/ports/NRF51/NRF51822/hal_lld.c b/os/hal/ports/NRF51/NRF51822/hal_lld.c
index 30fe6c0..af5e377 100644
--- a/os/hal/ports/NRF51/NRF51822/hal_lld.c
+++ b/os/hal/ports/NRF51/NRF51822/hal_lld.c
@@ -66,22 +66,16 @@ void hal_lld_init(void)
NRF_CLOCK->XTALFREQ = 0x00;
#endif
#endif
+
/* Low frequency clock initialisation
- * If source not specified, use the internal RC (0) which is prefered
- * over synthetized clock from the high frequency clock (2)
+ * Clock is only started if st driver requires it
*/
-#if defined(NRF51_LFCLK_SOURCE)
-#if (NRF51_LFCLK_SOURCE >=0) && (NRF51_LFCLK_SOURCE <= 2)
+ NRF_CLOCK->TASKS_LFCLKSTOP = 1;
NRF_CLOCK->LFCLKSRC = NRF51_LFCLK_SOURCE;
-#else
-#error "Possible value for NRF51_LFCLK_SOURCE are 0=RC, 1=XTAL, 2=Synth"
-#endif
-#else
- NRF_CLOCK->LFCLKSRC = 0;
-#endif
-#if (OSAL_ST_MODE != OSAL_ST_MODE_NONE)
+#if (OSAL_ST_MODE != OSAL_ST_MODE_NONE) && \
+ (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_RTC)
NRF_CLOCK->TASKS_LFCLKSTART = 1;
#endif
}
diff --git a/os/hal/ports/NRF51/NRF51822/hal_lld.h b/os/hal/ports/NRF51/NRF51822/hal_lld.h
index b685667..24eff21 100644
--- a/os/hal/ports/NRF51/NRF51822/hal_lld.h
+++ b/os/hal/ports/NRF51/NRF51822/hal_lld.h
@@ -39,15 +39,35 @@
* @}
*/
+/**
+ * @brief Frequency valuefor the Low Frequency Clock
+ */
+#define NRF51_LFCLK_FREQUENCY 32768
+
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
+/**
+ * @brief Select source of Low Frequency Clock (LFCLK)
+ * @details Possible values for source are:
+ * 0 : RC oscillator
+ * 1 : External cristal
+ * 2 : Synthetized clock from High Frequency Clock (HFCLK)
+ * When cristal is not available it's preferable to use the
+ * internal RC oscillator that synthezing the clock.
+ */
+#if !defined(NRF51_LFCLK_SOURCE) || defined(__DOXYGEN__)
+#define NRF51_LFCLK_SOURCE 0
+#endif
+
/*===========================================================================*/
-/* Driver constants and error checks. */
+/* Derived constants and error checks. */
/*===========================================================================*/
-#define NRF51_LFCLK_FREQUENCY 32768
+#if (NRF51_LFCLK_SOURCE < 0) || (NRF51_LFCLK_SOURCE > 2)
+#error "Possible value for NRF51_LFCLK_SOURCE are 0=RC, 1=XTAL, 2=Synth"
+#endif
/*===========================================================================*/
/* Driver data structures and types. */
diff --git a/os/hal/ports/NRF51/NRF51822/st_lld.c b/os/hal/ports/NRF51/NRF51822/st_lld.c
index d8c7b6c..a43a679 100644
--- a/os/hal/ports/NRF51/NRF51822/st_lld.c
+++ b/os/hal/ports/NRF51/NRF51822/st_lld.c
@@ -1,5 +1,6 @@
/*
ChibiOS - Copyright (C) 2015 Fabio Utzig
+ 2016 Stephane D'Alu
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
@@ -51,9 +52,12 @@
/*===========================================================================*/
#if (OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC) || defined(__DOXYGEN__)
+
+#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_RTC)
/**
* @brief System Timer vector (RTC0)
- * @details This interrupt is used for system tick in periodic mode.
+ * @details This interrupt is used for system tick in periodic mode
+ * if selected with NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_RTC
*
* @isr
*/
@@ -69,6 +73,32 @@ OSAL_IRQ_HANDLER(Vector6C) {
OSAL_IRQ_EPILOGUE();
}
+#endif
+
+#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_TIMER)
+/**
+ * @brief System Timer vector. (TIMER0)
+ * @details This interrupt is used for system tick in periodic mode
+ * if selected with NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_TIMER
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(Vector60) {
+
+ OSAL_IRQ_PROLOGUE();
+
+ /* Clear timer compare event */
+ if (NRF_TIMER0->EVENTS_COMPARE[0] != 0)
+ NRF_TIMER0->EVENTS_COMPARE[0] = 0;
+
+ osalSysLockFromISR();
+ osalOsTimerHandlerI();
+ osalSysUnlockFromISR();
+
+ OSAL_IRQ_EPILOGUE();
+}
+#endif
+
#endif /* OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC */
/*===========================================================================*/
@@ -86,6 +116,8 @@ void st_lld_init(void) {
#endif /* OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING */
#if OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC
+
+#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_RTC)
/* Using RTC with prescaler */
NRF_RTC0->TASKS_STOP = 1;
NRF_RTC0->PRESCALER = (NRF51_LFCLK_FREQUENCY / OSAL_ST_FREQUENCY) - 1;
@@ -96,6 +128,30 @@ void st_lld_init(void) {
NRF_RTC0->TASKS_START = 1;
#endif
+#if (NRF51_SYSTEM_TICKS == NRF51_SYSTEM_TICKS_AS_TIMER)
+ NRF_TIMER0->TASKS_CLEAR = 1;
+
+ /*
+ * Using 32-bit mode with prescaler 16 configures this
+ * timer with a 1MHz clock.
+ */
+ NRF_TIMER0->BITMODE = 3;
+ NRF_TIMER0->PRESCALER = 4;
+
+ /*
+ * Configure timer 0 compare capture 0 to generate interrupt
+ * and clear timer value when event is generated.
+ */
+ NRF_TIMER0->CC[0] = (1000000 / OSAL_ST_FREQUENCY) - 1;
+ NRF_TIMER0->SHORTS = 1;
+ NRF_TIMER0->INTENSET = 0x10000;
+
+ /* Start timer */
+ nvicEnableVector(TIMER0_IRQn, 8);
+ NRF_TIMER0->TASKS_START = 1;
+#endif
+
+#endif
}
#endif /* OSAL_ST_MODE != OSAL_ST_MODE_NONE */
diff --git a/os/hal/ports/NRF51/NRF51822/st_lld.h b/os/hal/ports/NRF51/NRF51822/st_lld.h
index 2e0672e..c62ff2c 100644
--- a/os/hal/ports/NRF51/NRF51822/st_lld.h
+++ b/os/hal/ports/NRF51/NRF51822/st_lld.h
@@ -31,14 +31,39 @@
/* Driver constants. */
/*===========================================================================*/
+/**
+ * @brief SPI0 interrupt priority level setting.
+ */
+#define NRF51_SYSTEM_TICKS_AS_TIMER 1
+
+/**
+ * @brief SPI0 interrupt priority level setting.
+ */
+#define NRF51_SYSTEM_TICKS_AS_RTC 2
+
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
+/**
+ * @brief Select the method to generates system ticks
+ * @details Possibles values are:
+ * NRF51_SYSTEM_TICKS_AS_TIMER for TIMER0
+ * NRF51_SYSTEM_TICKS_AS_RTC for RTC0
+ */
+#if !defined(NRF51_SYSTEM_TICKS) || defined(__DOXYGEN__)
+#define NRF51_SYSTEM_TICKS NRF51_SYSTEM_TICKS_AS_RTC
+#endif
+
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
+#if ((NRF51_SYSTEM_TICKS != NRF51_SYSTEM_TICKS_AS_RTC) && \
+ (NRF51_SYSTEM_TICKS != NRF51_SYSTEM_TICKS_AS_TIMER))
+#error "NRF51_SYSTEM_TICKS illegal value"
+#endif
+
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 01:07:40 +0000