STM32F1: Add support for timers 9 through 14.

This applies to XL-density STM32F1 devices.

In stm32f1/timer.c, add timer_dev's for the new timers, using the
timer_private API. These definitions are conditionally compiled based
on the target density to avoid wasting space on smaller MCUs. Also add
calls to the appropriate timer_private.h dispatch routines within the
IRQ handlers for these timers. We need to change the IRQ handler names
to reflect this eventually, but put that off for now, as it could
break backwards compatibility in some exotic situations where the user
refers to the libmaple IRQ handlers directly.

In stm32f1/timer.h, add register map base pointers and device
declarations for the new timers. timer_dev* declarations are compiled
in only when the target MCU supports them, in keeping with the above
stm32f1/timer.c changes.

In libmaple/timer.c, update the (static) IRQ enable routines to
account for the additional timers. This adds some code that's
unnecessary on smaller STM32F1s, but it's minimal (40 extra bytes on
my machine), so portability and readability win out.

Size change, using GCC version "(Sourcery G++ Lite 2011.03-42) 4.5.2":

Before:

   text	   data	    bss	    dec	    hex	filename
    615	      0	      0	    615	    267	build/home/mbolivar/leaf/libmaple/libmaple/timer.o

After:

   text	   data	    bss	    dec	    hex	filename
    655	      0	      0	    655	    28f	build/home/mbolivar/leaf/libmaple/libmaple/timer.o

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

1 files changed, 80 insertions, 3 deletions

diff --git a/libmaple/stm32f1/timer.c b/libmaple/stm32f1/timer.c
index 7506cb6..899abbc 100644
--- a/libmaple/stm32f1/timer.c
+++ b/libmaple/stm32f1/timer.c
@@ -30,14 +30,30 @@
  * @brief  STM32F1 timer support.
  */
 
+/* Notes:
+ *
+ * - We use STM32F1 density test macros throughout to avoid defining
+ *   symbols or linking in code that would use timers that are
+ *   unavailable in a given density. For example, TIM5 doesn't exist
+ *   on medium-density, and TIM9 doesn't exist on high-density, so we
+ *   don't define or use TIM5 when being compiled for medium-density,
+ *   and similarly for TIM9 and high-density.
+ *
+ *   This makes a mess, but helps avoid bloat and ensures backwards
+ *   compatibility. Since the mess is manageable and there don't seem
+ *   to be any plans on ST's part to add new STM32F1 lines or
+ *   densities, we'll live with it.
+ */
+
 #include <libmaple/timer.h>
 #include "timer_private.h"
 
 /*
  * Devices
+ *
+ * Defer to the timer_private API.
  */
 
-/* Use timer_private macros to save typing. */
 static DECLARE_ADVANCED_TIMER(timer1, 1);
 static DECLARE_GENERAL_TIMER(timer2, 2);
 static DECLARE_GENERAL_TIMER(timer3, 3);
@@ -66,7 +82,35 @@ timer_dev *TIMER6 = &timer6;
 timer_dev *TIMER7 = &timer7;
 /** Timer 8 device (advanced) */
 timer_dev *TIMER8 = &timer8;
-#endif
+#endif  /* defined(STM32_HIGH_DENSITY) || defined(STM32_XL_DENSITY) */
+
+#ifdef STM32_XL_DENSITY
+/* TIM9 has UIE, CC1IE, CC2IE, TIE bits in DIER. */
+static DECLARE_RESTRICTED_GENERAL_TIMER(timer9, 9, TIMER_DIER_TIE_BIT);
+/* TIM10 has UIE, CC1IE. */
+static DECLARE_RESTRICTED_GENERAL_TIMER(timer10, 10, TIMER_DIER_CC1IE_BIT);
+/* TIM11 has UIE, CC1IE. */
+static DECLARE_RESTRICTED_GENERAL_TIMER(timer11, 11, TIMER_DIER_CC1IE_BIT);
+/* TIM12 has UIE, CC1IE, CC2IE, TIE. */
+static DECLARE_RESTRICTED_GENERAL_TIMER(timer12, 12, TIMER_DIER_TIE_BIT);
+/* TIM13 has UIE, CC1IE. */
+static DECLARE_RESTRICTED_GENERAL_TIMER(timer13, 13, TIMER_DIER_CC1IE_BIT);
+/* TIM14 has UIE, CC1IE. */
+static DECLARE_RESTRICTED_GENERAL_TIMER(timer14, 14, TIMER_DIER_CC1IE_BIT);
+
+/** Timer 9 device (general-purpose) */
+timer_dev *TIMER9 = &timer9;
+/** Timer 10 device (general-purpose) */
+timer_dev *TIMER10 = &timer10;
+/** Timer 11 device (general-purpose) */
+timer_dev *TIMER11 = &timer11;
+/** Timer 12 device (general-purpose) */
+timer_dev *TIMER12 = &timer12;
+/** Timer 13 device (general-purpose) */
+timer_dev *TIMER13 = &timer13;
+/** Timer 14 device (general-purpose) */
+timer_dev *TIMER14 = &timer14;
+#endif  /* STM32_XL_DENSITY */
 
 /*
  * Routines
@@ -87,22 +131,46 @@ void timer_foreach(void (*fn)(timer_dev*)) {
     fn(TIMER7);
     fn(TIMER8);
 #endif
+#ifdef STM32_XL_DENSITY
+    fn(TIMER9);
+    fn(TIMER10);
+    fn(TIMER11);
+    fn(TIMER12);
+    fn(TIMER13);
+    fn(TIMER14);
+#endif
 }
 
 /*
  * IRQ handlers
+ *
+ * Defer to the timer_private dispatch API.
+ *
+ * FIXME: The names of these handlers are inaccurate since XL-density
+ * devices came out. Update these to match the STM32F2 names, maybe
+ * using some weak symbol magic to preserve backwards compatibility if
+ * possible.
  */
 
 void __irq_tim1_brk(void) {
     dispatch_adv_brk(TIMER1);
+#ifdef STM32_XL_DENSITY
+    dispatch_tim_9_12(TIMER9);
+#endif
 }
 
 void __irq_tim1_up(void) {
     dispatch_adv_up(TIMER1);
+#ifdef STM32_XL_DENSITY
+    dispatch_tim_10_11_13_14(TIMER10);
+#endif
 }
 
 void __irq_tim1_trg_com(void) {
     dispatch_adv_trg_com(TIMER1);
+#ifdef STM32_XL_DENSITY
+    dispatch_tim_10_11_13_14(TIMER11);
+#endif
 }
 
 void __irq_tim1_cc(void) {
@@ -136,17 +204,26 @@ void __irq_tim7(void) {
 
 void __irq_tim8_brk(void) {
     dispatch_adv_brk(TIMER8);
+#ifdef STM32_XL_DENSITY
+    dispatch_tim_9_12(TIMER12);
+#endif
 }
 
 void __irq_tim8_up(void) {
     dispatch_adv_up(TIMER8);
+#ifdef STM32_XL_DENSITY
+    dispatch_tim_10_11_13_14(TIMER13);
+#endif
 }
 
 void __irq_tim8_trg_com(void) {
     dispatch_adv_trg_com(TIMER8);
+#ifdef STM32_XL_DENSITY
+    dispatch_tim_10_11_13_14(TIMER14);
+#endif
 }
 
 void __irq_tim8_cc(void) {
     dispatch_adv_cc(TIMER8);
 }
-#endif
+#endif  /* defined(STM32_HIGH_DENSITY) || defined(STM32_XL_DENSITY) */