Initial support for iriver backlight dimming. Unfortunately dimming

remote control's EL-backlight is not possible.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6747 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 217 insertions, 3 deletions

diff --git a/firmware/backlight.c b/firmware/backlight.c
index e006d3aeb5..84d3f1a31e 100644
--- a/firmware/backlight.c
+++ b/firmware/backlight.c
@@ -59,6 +59,218 @@ static int remote_backlight_timer;
 static unsigned int remote_backlight_timeout = 5;
 #endif
 
+#if CONFIG_BACKLIGHT == BL_IRIVER
+#define BL_PWM_COUNT    100
+/* Cycle interval in ms */
+#define BL_PWM_INTERVAL      5000
+#define BL_PWM_INTERVAL_IDLE 500000
+#define BL_DIM_SPEED    4
+#define __backlight_on __backlight_fade_in
+#define __backlight_off __backlight_fade_out
+
+#define DIM_STATE_START  0
+#define DIM_STATE_MAIN   1
+#define DIM_STATE_REMOTE 2
+
+static bool bl_timer_active = false;
+static int bl_dim_current = BL_PWM_COUNT;
+static int bl_dim_target  = BL_PWM_COUNT;
+static int bl_pwm_counter = 0;
+static volatile int bl_cycle_counter = 0;
+
+/* Unfortunately we can't dim H1xx remote lcd :/ */
+#ifdef HAVE_REMOTE_LCD_DIMMABLE
+#define lcd_remote_backlight_on __backlight_fade_remote_in
+#define lcd_remote_backlight_off __backlight_fade_remote_out
+static int bl_dim_remote_current = BL_PWM_COUNT;
+static int bl_dim_remote_target = BL_PWM_COUNT;
+static int bl_pwm_remote_counter = 0;
+static bool bl_dim_next_interval;
+#endif
+
+static int bl_dim_state = 0;
+
+void backlight_start_timer(void)
+{
+    unsigned int count;
+    
+    if (bl_timer_active)
+        return ;
+        
+    count = 1;
+    bl_timer_active = true;
+
+    /* We are using timer 1 */
+    TRR1 = count; /* The reference count */
+    TCN1 = 0; /* reset the timer */
+    TMR1 = 0x011d; /* prescaler=2, restart, CLK/16, enabled */
+
+    TER1 = 0xff; /* Clear all events */
+    
+    /* ICR2 (Timer2) */
+    ICR0 = (ICR0 & 0xffff00ff) | 0x00009000; /* Interrupt on level 4.0 */
+    IMR &= ~(1<<10);
+}
+
+void TIMER1(void) __attribute__ ((interrupt_handler));
+void TIMER1(void)
+{
+    int timer_period;
+#ifdef HAVE_REMOTE_LCD_DIMMABLE
+    int new_timer_period;
+#endif
+
+    timer_period = FREQ/20000 * BL_PWM_INTERVAL / 100 / 32;
+    switch (bl_dim_state) {
+    /* New cycle */
+    case DIM_STATE_START:
+        bl_pwm_counter = 0;
+        bl_cycle_counter++;
+        
+        if (bl_dim_current > 0 && bl_dim_current < BL_PWM_COUNT) {
+            GPIO1_OUT &= ~0x00020000;
+            bl_pwm_counter = bl_dim_current;
+            timer_period = timer_period * bl_pwm_counter / BL_PWM_COUNT;
+            bl_dim_state = DIM_STATE_MAIN;
+        } else {
+            if (bl_dim_current)
+                GPIO1_OUT &= ~0x00020000;
+            else
+                GPIO1_OUT |= 0x00020000;
+        }
+        
+#ifdef HAVE_REMOTE_LCD_DIMMABLE
+        bl_dim_next_interval = 0;
+        bl_pwm_remote_counter = 0;
+        if (bl_dim_remote_current > 0 && 
+            bl_dim_remote_current < BL_PWM_COUNT) {
+            GPIO_OUT &= ~0x00000800;
+            bl_pwm_remote_counter = bl_dim_remote_current;
+            if (bl_dim_state == DIM_STATE_START) {
+                timer_period = timer_period * bl_pwm_remote_counter 
+                               / BL_PWM_COUNT;
+                bl_dim_state = DIM_STATE_REMOTE;
+                break ;
+            }
+            
+            new_timer_period = timer_period * bl_pwm_remote_counter
+                                / BL_PWM_COUNT;
+            if (new_timer_period < timer_period) {
+                bl_dim_next_interval = timer_period - new_timer_period;
+                timer_period = new_timer_period;
+                bl_dim_state = DIM_STATE_REMOTE;
+            } else {
+                bl_dim_next_interval = new_timer_period - timer_period;
+            }
+        } else {
+            if (bl_dim_remote_current)
+                GPIO_OUT &= ~0x00000800;
+            else
+                GPIO_OUT |= 0x00000800;
+        }
+#endif        
+        break ;
+        
+    /* Dim main screen */
+    case DIM_STATE_MAIN:
+        GPIO1_OUT |= 0x00020000;
+#ifdef HAVE_REMOTE_LCD_DIMMABLE
+        if (bl_dim_next_interval) {
+            timer_period = bl_dim_next_interval;
+            bl_dim_next_interval = 0;
+            bl_dim_state = DIM_STATE_REMOTE;
+            break ;
+        }
+#endif
+        bl_dim_state = DIM_STATE_START;
+        timer_period = timer_period * (BL_PWM_COUNT - bl_pwm_counter) / BL_PWM_COUNT;
+        break ;
+
+#ifdef HAVE_REMOTE_LCD_DIMMABLE
+    /* Dim remote lcd */
+    case DIM_STATE_REMOTE:
+        GPIO_OUT |= 0x00000800;
+        if (bl_dim_next_interval) {
+            timer_period = bl_dim_next_interval;
+            bl_dim_next_interval = 0;
+            bl_dim_state = DIM_STATE_MAIN;
+            break ;
+        }
+    
+        bl_dim_state = DIM_STATE_START;
+        timer_period = timer_period * (BL_PWM_COUNT - bl_pwm_remote_counter) / BL_PWM_COUNT;
+        break ;
+#endif
+    }
+    
+    if (bl_cycle_counter >= BL_DIM_SPEED) {
+        bool idle = true;
+        if (bl_dim_target > bl_dim_current) {
+            bl_dim_current++;
+            idle = false;
+        }
+        else if (bl_dim_target < bl_dim_current) {
+            bl_dim_current--;
+            idle = false;
+        }
+#ifdef HAVE_REMOTE_LCD_DIMMABLE
+        if (bl_dim_remote_target > bl_dim_remote_current) {
+            bl_dim_remote_current++;
+            idle = false;
+        }
+        else if (bl_dim_remote_target < bl_dim_remote_current) {
+            bl_dim_remote_current--;
+            idle = false;
+        }
+#endif
+        bl_cycle_counter = 0;
+        
+        /* Save CPU & battery when idle, stop timer */
+        if (idle) {
+            bl_timer_active = false;
+            TMR1 = 0;
+        }
+    }
+    
+    TRR1 = timer_period;
+    TCN1 = 0;
+    TER1 = 0xff; /* Clear all events */
+}
+
+static void __backlight_dim(int value)
+{
+    bl_dim_target = value;
+    backlight_start_timer();
+}
+
+static void __backlight_fade_in(void)
+{
+    __backlight_dim(BL_PWM_COUNT);
+}
+
+static void __backlight_fade_out(void)
+{
+    __backlight_dim(0);
+}
+
+#ifdef HAVE_REMOTE_LCD_DIMMABLE
+static void __backlight_dim_remote(int value)
+{
+    bl_dim_remote_target = value;
+}
+
+static void __backlight_fade_remote_in(void)
+{
+    __backlight_dim_remote(BL_PWM_COUNT);
+}
+
+static void __backlight_fade_remote_out(void)
+{
+    __backlight_dim_remote(0);
+}
+#endif
+
+#else
 static void __backlight_off(void)
 {
 #if CONFIG_BACKLIGHT == BL_IRIVER
@@ -91,6 +303,7 @@ static void __backlight_on(void)
     P1 |= 0x10;
 #endif
 }
+#endif
 
 void backlight_thread(void)
 {
diff --git a/firmware/system.c b/firmware/system.c
index d095e1574a..66bd90f71b 100644
--- a/firmware/system.c
+++ b/firmware/system.c
@@ -432,12 +432,13 @@ void (* const vbr[]) (void) __attribute__ ((section (".vectors"))) =
     UIE,UIE,UIE,UIE,UIE,UIE,
     UIE,UIE,UIE,UIE,UIE,UIE,UIE,UIE,
     UIE,UIE,UIE,UIE,UIE,UIE,UIE,UIE,
-    UIE,UIE,UIE,TIMER0,UIE,UIE,UIE,UIE,
-
+    UIE,UIE,UIE,TIMER0,TIMER1,UIE,UIE,UIE,
+    /*          lvl 3  lvl 4             */
+                
     TRAP0,TRAP1,TRAP2,TRAP3,TRAP4,TRAP5,TRAP6,TRAP7,
     TRAP8,TRAP9,TRAP10,TRAP11,TRAP12,TRAP13,TRAP14,TRAP15,
     
-    SWT,UIE,TIMER1,I2C,UART1,UART2,DMA0,DMA1,
+    SWT,UIE,UIE,I2C,UART1,UART2,DMA0,DMA1,
     DMA2,DMA3,QSPI,UIE,UIE,UIE,UIE,UIE,
     PDIR1FULL,PDIR2FULL,EBUTXEMPTY,IIS2TXEMPTY,
     IIS1TXEMPTY,PDIR3FULL,PDIR3RESYN,UQ2CHANERR,