rtc: Sends tick events. Sleep mode has been temporarily reduced to EM1.

27861f4f · Projects · 44cb96b6 · 27861f4f · 27861f4f · 27861f4f
Commit 27861f4f authored Aug 26, 2014 by Projects
7 changed files
--- a/sw/common/drivers/rtc.c
+++ b/sw/common/drivers/rtc.c
+/*
+ * Copyright (C) 2014 Julian Lewis
+ * @author Matthieu Cattin <matthieu.cattin@cern.ch>
+ * @author Maciej Suminski <maciej.suminski@cern.ch>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @brief Real time clock routines.
+ */
+
+#include "rtc.h"
+
+#include <em_burtc.h>
+#include <em_rmu.h>
+#include <em_cmu.h>
+
+#define LFXO_FREQUENCY                  32768
+#define WAKEUP_INTERVAL_MS              1200
+#define BURTC_COUNT_BETWEEN_WAKEUP      (((LFXO_FREQUENCY * WAKEUP_INTERVAL_MS) / 1000)-1)
+
+struct rtc_time time = {0, 0};
+
+__attribute__((weak))
+void BURTC_IRQHandler(void)
+{
+    rtc_tick();
+
+    BURTC_IntClear(BURTC_IFC_COMP0);
+}
+
+void rtc_init(void)
+{
+    // Enable LFXO and select it for LFA branch
+    CMU_OscillatorEnable(cmuOsc_LFXO, true, true);
+    CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFXO);
+
+    // Enable low energy clocking module clock
+    CMU_ClockEnable(cmuClock_CORELE, true);
+
+    // Enable BURTC registers access
+    RMU_ResetControl(rmuResetBU, false);
+
+    BURTC_Init_TypeDef burtcInit = BURTC_INIT_DEFAULT;
+
+    burtcInit.enable       = true;                // Enable BURTC after initialization
+    burtcInit.mode         = burtcModeEM3;        // BURTC is enabled in EM0-EM3
+    burtcInit.debugRun     = false;               // Counter shall keep running during debug halt.
+    burtcInit.clkSel       = burtcClkSelLFXO;     // Select LFXO as clock source
+    burtcInit.clkDiv       = burtcClkDiv_1;       // Clock prescaler
+    burtcInit.lowPowerComp = 0;                   // Number of least significantt clock bits to ignore in low power mode
+    burtcInit.timeStamp    = true;                // Enable time stamp on entering backup power domain
+    burtcInit.compare0Top  = true;                // Clear counter on compare match
+    burtcInit.lowPowerMode = burtcLPDisable;      // Low power operation mode, requires LFXO or LFRCO
+
+    BURTC_CompareSet(0, BURTC_COUNT_BETWEEN_WAKEUP);  // Set top value for comparator
+
+    // Enabling Interrupt from BURTC
+    NVIC_EnableIRQ(BURTC_IRQn);
+    BURTC_IntEnable(BURTC_IF_COMP0);    // Enable compare interrupt flag
+
+    // Initialize BURTC
+    BURTC_Init(&burtcInit);
+}
+
+struct rtc_time rtc_get_time(void)
+{
+    return time;
+}
+
+void rtc_set_time(struct rtc_time current)
+{
+    time = current;
+}
+
+void rtc_tick(void)
+{
+    ++time.epoch;
+    time.msecs += 200;
+
+    if(time.msecs == 1000) {
+        ++time.epoch;
+        time.msecs = 0;
+    }
+}
+
--- a/sw/common/drivers/rtc.h
+++ b/sw/common/drivers/rtc.h
+/*
+ * Copyright (C) 2014 Julian Lewis
+ * @author Matthieu Cattin <matthieu.cattin@cern.ch>
+ * @author Maciej Suminski <maciej.suminski@cern.ch>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @brief Real time clock routines.
+ */
+
+#ifndef RTC_H
+#define RTC_H
+
+struct rtc_time {
+    ///> Seconds since 01-01-1970 00:00
+    unsigned int epoch;
+
+    ///> Milliseconds
+    unsigned int msecs;
+};
+
+/**
+ * @brief Setup backup RTC
+ * Using LFRCO clock source and enabling interrupt on COMP0 match
+ */
+void rtc_init(void);
+
+/**
+ * @brief Returns the current time.
+ */
+struct rtc_time rtc_get_time(void);
+
+/**
+ * @brief Sets the time.
+ */
+void rtc_set_time(struct rtc_time current);
+
+/**
+ * @brief Function to be called on every timer tick in the interrupt
+ * servicer routine.
+ */
+void rtc_tick(void);
+
+#endif /* RTC_H */
--- a/sw/common/event.h
+++ b/sw/common/event.h
@@ -32,7 +32,8 @@
 */
 enum event_type {
    BUTTON_PRESSED,
-    SENSOR
+    SENSOR,
+    RTC_TICK
 };

 /**

--- a/sw/freertos/Makefile
+++ b/sw/freertos/Makefile
@@ -137,6 +137,7 @@ C_SRC +=  \
 ../common/emdrv/sleep/src/sleep.c \
 ../common/drivers/lcd.c \
 ../common/drivers/buttons.c \
+../common/drivers/rtc.c \
 ../common/gfx/font_helv11.c \
 ../common/gfx/font_helv17.c \
 ../common/gfx/font_helv17b.c \

--- a/sw/freertos/src/FreeRTOSConfig.h
+++ b/sw/freertos/src/FreeRTOSConfig.h
@@ -89,7 +89,7 @@ extern "C" {
 /* Available options when configUSE_TICKLESS_IDLE set to 1 
 * or configUSE_SLEEP_MODE_IN_IDLE set to 1 :
 * 1 - EM1, 2 - EM2, 3 - EM3, timer in EM3 is not very accurate*/
-#define configSLEEP_MODE           ( 3 )
+#define configSLEEP_MODE           ( 1 )
 /* Definition used only if configUSE_TICKLESS_IDLE == 0 */
 #define configUSE_SLEEP_MODE_IN_IDLE       ( 1 )


--- a/sw/freertos/src/irq_dispatcher.c
+++ b/sw/freertos/src/irq_dispatcher.c
@@ -28,7 +28,10 @@
 #include <apps/application.h>
 #include <event.h>

+#include <drivers/rtc.h>
+
 #include <em_gpio.h>
+#include <em_burtc.h>

 static portBASE_TYPE gpio_irq_dispatcher(uint32_t flags)
 {
@@ -49,7 +52,7 @@ static portBASE_TYPE gpio_irq_dispatcher(uint32_t flags)
        default: return xHigherPriorityTaskWoken;
    }

-    // Post the byte to the back of the queue
+    // Post the event to the back of the queue
    xQueueSendToBackFromISR(appQueue, &evt, &xHigherPriorityTaskWoken);

    return xHigherPriorityTaskWoken;
@@ -81,3 +84,22 @@ void GPIO_ODD_IRQHandler(void)
    portEND_SWITCHING_ISR(gpio_irq_dispatcher(iflags));
 }

+void BURTC_IRQHandler(void)
+{
+    // We have not woken a task at the start of the ISR
+    portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
+
+    rtc_tick();
+
+    // Fill the event data
+    struct event evt;
+    evt.type = RTC_TICK;
+
+    // Post the byte to the back of the queue
+    xQueueSendToBackFromISR(appQueue, &evt, &xHigherPriorityTaskWoken);
+
+    BURTC_IntClear(BURTC_IFC_COMP0);
+
+    portEND_SWITCHING_ISR(xHigherPriorityTaskWoken);
+}
+
--- a/sw/freertos/src/main.c
+++ b/sw/freertos/src/main.c
@@ -32,6 +32,7 @@
 #include <apps/menu.h>
 #include <drivers/buttons.h>
 #include <drivers/lcd.h>
+#include <drivers/rtc.h>
 #include <gfx/ui.h>

 int main(void)
@@ -44,6 +45,7 @@ int main(void)
    CMU_ClockEnable(cmuClock_GPIO, true);

    buttons_init();
+    rtc_init();
    lcd_init();
    ui_init();