Bring back HardwareTimer.

Untested, but the timers work on F2 (see exampes/test-timers.cpp), so
I'm hoping this is mostly OK. Note that there's an issue with TIMER2
and TIMER5 on F2: these timers have 32-bit counters, and the
HardwareTimer methods are all based on uint16 (like on F1).

I'm sorely tempted to keep this as-is; exposing the extra bits is just
extra documentation, and the HardwareTimer interface is already way
too complicated. The interface should still _work_; it just hides the
fact that you're missing out on the extra bits for some of the timers.

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

3 files changed, 104 insertions, 23 deletions

diff --git a/wirish/HardwareTimer.cpp b/wirish/HardwareTimer.cpp
index 52257bf..ca8ea63 100644
--- a/wirish/HardwareTimer.cpp
+++ b/wirish/HardwareTimer.cpp
@@ -30,33 +30,114 @@
 
 // TODO [0.1.0] Remove deprecated pieces
 
-#ifdef STM32_MEDIUM_DENSITY
-#define NR_TIMERS 4
-#elif defined(STM32_HIGH_DENSITY)
-#define NR_TIMERS 8
+#define MAX_RELOAD ((1 << 16) - 1)
+
+/*
+ * Big ugly table of timers available on the MCU. Needed by the
+ * HardwareTimer constructor. Sigh; maybe predefined instances weren't
+ * such a bad idea. Oh well, at least the HardwareTimer interface is
+ * officially unstable since v0.0.12; we can always get rid of this
+ * later.
+ */
+
+#define MAX_NR_TIMERS 17 // No STM32 I've ever heard of has higher than TIMER17
+
+static timer_dev *devs[MAX_NR_TIMERS] = {
+#if STM32_HAVE_TIMER(1)
+    TIMER1,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(2)
+    TIMER2,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(3)
+    TIMER3,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(4)
+    TIMER4,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(5)
+    TIMER5,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(6)
+    TIMER6,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(7)
+    TIMER7,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(8)
+    TIMER8,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(9)
+    TIMER9,
 #else
-#error "Unsupported density"
+    NULL,
 #endif
+#if STM32_HAVE_TIMER(10)
+    TIMER10,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(11)
+    TIMER11,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(12)
+    TIMER12,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(13)
+    TIMER13,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(14)
+    TIMER14,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(15)
+    TIMER15,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(16)
+    TIMER16,
+#else
+    NULL,
+#endif
+#if STM32_HAVE_TIMER(17)
+    TIMER17,
+#else
+    NULL,
+#endif
+};
 
-#define MAX_RELOAD ((1 << 16) - 1)
+/*
+ * HardwareTimer routines
+ */
 
 HardwareTimer::HardwareTimer(uint8 timerNum) {
-    if (timerNum > NR_TIMERS) {
-        ASSERT(0);
-    }
-    timer_dev *devs[] = {
-        TIMER1,
-        TIMER2,
-        TIMER3,
-        TIMER4,
-#ifdef STM32_HIGH_DENSITY
-        TIMER5,
-        TIMER6,
-        TIMER7,
-        TIMER8,
-#endif
-    };
+    ASSERT(timerNum <= MAX_NR_TIMERS);
     this->dev = devs[timerNum - 1];
+    ASSERT(this->dev != NULL);
 }
 
 void HardwareTimer::pause(void) {
diff --git a/wirish/include/wirish/HardwareTimer.h b/wirish/include/wirish/HardwareTimer.h
index bdcca5d..d322033 100644
--- a/wirish/include/wirish/HardwareTimer.h
+++ b/wirish/include/wirish/HardwareTimer.h
@@ -313,7 +313,7 @@ extern HardwareTimer Timer3;
  * Pre-instantiated timer.
  */
 extern HardwareTimer Timer4;
-#ifdef STM32_HIGH_DENSITY
+#if (STM32_MCU_SERIES == STM32_SERIES_F1) && defined(STM32_HIGH_DENSITY)
 /**
  * @brief Deprecated.
  *
diff --git a/wirish/rules.mk b/wirish/rules.mk
index deb3906..54c9180 100644
--- a/wirish/rules.mk
+++ b/wirish/rules.mk
@@ -23,6 +23,7 @@ cSRCS_$(d) := start_c.c
 cppSRCS_$(d) := boards.cpp
 cppSRCS_$(d) += cxxabi-compat.cpp
 cppSRCS_$(d) += HardwareSerial.cpp
+cppSRCS_$(d) += HardwareTimer.cpp
 cppSRCS_$(d) += Print.cpp
 cppSRCS_$(d) += wirish_analog.cpp
 cppSRCS_$(d) +=	wirish_digital.cpp
@@ -34,7 +35,6 @@ cppSRCS_$(d) += $(MCU_SERIES)/wirish_digital.cpp
 cppSRCS_$(d) += $(WIRISH_BOARD_PATH)/board.cpp
 # TODO: revise these appropriately F2 and put them back in:
 # HardwareSPI.cpp
-# HardwareTimer.cpp
 # usb_serial.cpp
 # pwm.cpp
 # ext_interrupts.cpp