backlight: Driver, basic functions.

515e5834 · Projects · a3d6a733 · 515e5834 · 515e5834 · 515e5834
Commit 515e5834 authored Aug 31, 2014 by Projects
5 changed files
--- a/sw/common/drivers/backlight.c
+++ b/sw/common/drivers/backlight.c
+/*
+ * Copyright (C) 2014 Julian Lewis
+ * @author Maciej Suminski <maciej.suminski@cern.ch>
+ * @author Matthieu Cattin <matthieu.cattin@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 Backlight control.
+ */
+
+#include "backlight.h"
+
+#include <em_cmu.h>
+#include <em_gpio.h>
+#include <em_timer.h>
+
+static int backlight_level;
+
+void backlight_init(void)
+{
+    CMU_ClockEnable(cmuClock_TIMER1, true);
+
+    // Configure backlight LED pins as outputs
+    GPIO_PinModeSet(gpioPortE, 11, gpioModePushPull, 0);
+    GPIO_PinModeSet(gpioPortE, 12, gpioModePushPull, 0);
+
+    // Select CC channel parameters
+    TIMER_InitCC_TypeDef timerCCInit =
+    {
+        .eventCtrl  = timerEventEveryEdge,
+        .edge       = timerEdgeBoth,
+        .prsSel     = timerPRSSELCh1,
+        .cufoa      = timerOutputActionNone,
+        .cofoa      = timerOutputActionNone,
+        .cmoa       = timerOutputActionToggle,
+        .mode       = timerCCModePWM,
+        .filter     = false,
+        .prsInput   = false,
+        .coist      = false,
+        .outInvert  = false,
+    };
+
+    // Configure CC channel 1 & 2
+    TIMER_InitCC(TIMER1, 1, &timerCCInit);
+    TIMER_InitCC(TIMER1, 2, &timerCCInit);
+
+    // Route CC1 to location 1 (PE11) and enable pin
+    TIMER1->ROUTE |= (TIMER_ROUTE_CC1PEN | TIMER_ROUTE_LOCATION_LOC1);
+
+    // Route CC2 to location 1 (PE12) and enable pin
+    TIMER1->ROUTE |= (TIMER_ROUTE_CC2PEN | TIMER_ROUTE_LOCATION_LOC1);
+
+    // Select timer parameters
+    TIMER_Init_TypeDef timerInit =
+    {
+        .enable     = true,
+        .debugRun   = true,
+        .prescale   = timerPrescale64,
+        .clkSel     = timerClkSelHFPerClk,
+        .fallAction = timerInputActionNone,
+        .riseAction = timerInputActionNone,
+        .mode       = timerModeUp,
+        .dmaClrAct  = false,
+        .quadModeX4 = false,
+        .oneShot    = false,
+        .sync       = false,
+    };
+
+    // Set Top Value (determines PWM frequency)
+    // TODO the top value may need adjustments if HFPER changes
+    // TIMER_TopSet(TIMER1, CMU_ClockFreqGet(cmuClock_HFPER) / 100000));
+    TIMER_TopSet(TIMER1, 100);
+
+    backlight_set_level(0);
+
+    // Configure timer
+    TIMER_Init(TIMER1, &timerInit);
+}
+
+void backlight_set_level(int level)
+{
+    const int BL_MAX_LEVEL = 100;
+
+    if(level <= 0) {
+        TIMER_Enable(TIMER1, false);
+        level = 0;  // in case level is negative
+    } else {
+        // Reenable the timer, if it was turned off previously
+        if(backlight_level == 0)
+            TIMER_Enable(TIMER1, true);
+
+        if(level > BL_MAX_LEVEL)
+            level = BL_MAX_LEVEL;
+
+        TIMER_CompareBufSet(TIMER1, 1, level);
+        TIMER_CompareBufSet(TIMER1, 2, level);
+    }
+
+    backlight_level = level;
+}
+
+unsigned int backlight_get_level(void)
+{
+    return backlight_level;
+}
+
--- a/sw/common/drivers/backlight.h
+++ b/sw/common/drivers/backlight.h
+/*
+ * Copyright (C) 2014 Julian Lewis
+ * @author Maciej Suminski <maciej.suminski@cern.ch>
+ * @author Matthieu Cattin <matthieu.cattin@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 Backlight control.
+ */
+
+#ifndef BACKLIGHT_H
+#define BACKLIGHT_H
+
+/**
+ * @brief Initialize backlight control.
+ */
+void backlight_init(void);
+
+/**
+ * @brief Sets the backlight brightness.
+ * @param level is the brightness level to be set. Valid values are in the
+ * 0-100 range. 0 stands for completely turned off, 100 is full brightness.
+ */
+void backlight_set_level(int level);
+
+/**
+ * @brief Returns the current level of backlight.
+ */
+unsigned int backlight_get_level(void);
+
+#endif /* BACKLIGHT_H */
+
--- a/sw/freertos/Makefile
+++ b/sw/freertos/Makefile
@@ -139,6 +139,7 @@ C_SRC +=  \
 ../common/emlib/src/em_usart.c \
 ../common/emdrv/sleep/src/sleep.c \
 ../common/drivers/lcd.c \
+../common/drivers/backlight.c \
 ../common/drivers/buttons.c \
 ../common/drivers/buzzer.c \
 ../common/drivers/rtc.c \

--- a/sw/freertos/src/apps/example_app.c
+++ b/sw/freertos/src/apps/example_app.c
@@ -26,6 +26,7 @@

 #include "application.h"
 #include "widgets/status_bar.h"
+#include "drivers/backlight.h"
 #include "drivers/buzzer.h"
 #include "drivers/vibra.h"

@@ -47,16 +48,18 @@ static void widget_event(struct ui_widget *w, const struct event *evt)
    switch(evt->type) {
    case BUTTON_PRESSED:
        switch(evt->data.button) {
-            case BUT_TR:
-                strcpy(message, "top right");
+            case BUT_TR:    // top right button
+                backlight_set_level(backlight_get_level() + 10);
+                sprintf(message, "top right (bl: %d)", backlight_get_level());
                break;

-            case BUT_BR:
-                strcpy(message, "bottom right");
+            case BUT_BR:    // bottom right button
+                backlight_set_level(backlight_get_level() - 10);
+                sprintf(message, "bot right (bl: %d)", backlight_get_level());
                break;

-            case BUT_BL:
-                strcpy(message, "bottom left");
+            case BUT_BL:    // bottom left button
+                strcpy(message, "bot left");
                break;

            case BUT_TL:    // this should not happen, it is handled

--- a/sw/freertos/src/main.c
+++ b/sw/freertos/src/main.c
@@ -30,6 +30,7 @@
 #include <sleep.h>

 #include <apps/app_list.h>
+#include <drivers/backlight.h>
 #include <drivers/buttons.h>
 #include <drivers/buzzer.h>
 #include <drivers/lcd.h>
@@ -46,6 +47,7 @@ int main(void)
    CMU_ClockEnable(cmuClock_HFPER, true);
    CMU_ClockEnable(cmuClock_GPIO, true);

+    backlight_init();
    buttons_init();
    buzzer_init();
    vibra_init();
@@ -53,9 +55,6 @@ int main(void)
    lcd_init();
    ui_init();

-    GPIO_PinModeSet(gpioPortE, 11, gpioModePushPull, 0);
-    GPIO_PinModeSet(gpioPortE, 12, gpioModePushPull, 0);
-
    // Initialize SLEEP driver, no callbacks are used
    SLEEP_Init(NULL, NULL);
 #if (configSLEEP_MODE < 3)