initial attempt at timer int support on stm32

src/platform/stm32/platform.c

@@ -692,8 +692,10 @@ int platform_s_uart_set_flow_control( unsigned id, int type )
 // ****************************************************************************
 // Timers
 
+u8 stm32_timer_int_periodic_flag[ NUM_PHYS_TIMER ];
+
 // We leave out TIM6/TIM for now, as they are dedicated
-static TIM_TypeDef * const timer[] = { TIM1, TIM2, TIM3, TIM4, TIM5 };
+const TIM_TypeDef * const timer[] = { TIM1, TIM2, TIM3, TIM4, TIM5 };
 #define TIM_GET_PRESCALE( id ) ( ( id ) == 0 || ( id ) == 5 ? ( PCLK2_DIV ) : ( PCLK1_DIV ) )
 #define TIM_GET_BASE_CLK( id ) ( TIM_GET_PRESCALE( id ) == 1 ? ( HCLK / TIM_GET_PRESCALE( id ) ) : ( HCLK / ( TIM_GET_PRESCALE( id ) / 2 ) ) )
 #define TIM_STARTUP_CLOCK       50000
@@ -802,7 +804,44 @@ u32 platform_s_timer_op( unsigned id, int op, u32 data )
 
 int platform_s_timer_set_match_int( unsigned id, u32 period_us, int type )
 {
-  return PLATFORM_TIMER_INT_INVALID_ID;
+  TIM_TypeDef* base = ( TIM_TypeDef* )timer[ id ];
+  u32 freq;
+  timer_data_type final;
+  TIM_OCInitTypeDef  TIM_OCInitStructure;
+
+  if( period_us == 0 )
+  {
+    TIM_ITConfig( base, TIM_IT_CC1, DISABLE );
+    base->CR1 = 0; // Why are we doing this?
+    base->CR2 = 0;
+    return PLATFORM_TIMER_INT_OK; 
+  }
+  timer_set_clock( id, 1000000 );
+  freq = timer_get_clock( id );
+  final = ( ( u64 )period_us * freq ) / 1000000;
+  if( final == 0 )
+    return PLATFORM_TIMER_INT_TOO_SHORT;
+  if( final > 0xFFFF )
+    return PLATFORM_TIMER_INT_TOO_LONG;
+
+  TIM_Cmd( base, DISABLE );
+
+  TIM_OCStructInit( &TIM_OCInitStructure );
+  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
+  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
+  TIM_OCInitStructure.TIM_Pulse = final;
+  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
+  TIM_OC1Init( base, &TIM_OCInitStructure );
+
+  TIM_OC1PreloadConfig( base, TIM_OCPreload_Disable );
+
+  stm32_timer_int_periodic_flag[ id ] = type;
+  
+  TIM_SetCounter( base, 0 );
+  TIM_Cmd( base, ENABLE );
+  TIM_ITConfig( base, TIM_IT_CC1, ENABLE );
+
+  return PLATFORM_TIMER_INT_OK;
 }
 
 // ****************************************************************************

src/platform/stm32/platform_conf.h

@@ -112,6 +112,7 @@
 #define NUM_SPI               2
 #define NUM_UART              5
 #define NUM_TIMER             5
+#define NUM_PHYS_TIMER        5
 #define NUM_PWM               4
 #define NUM_ADC               16
 #define NUM_CAN               1

src/platform/stm32/platform_int.c

@@ -9,6 +9,10 @@
 // Platform-specific headers
 #include "stm32f10x.h"
 
+#ifndef VTMR_TIMER_ID
+#define VTMR_TIMER_ID         ( -1 )
+#endif
+
 // ****************************************************************************
 // Interrupt handlers
 
@@ -128,6 +132,56 @@ void EXTI15_10_IRQHandler()
   }
 }
 
+// ----------------------------------------------------------------------------
+// Timer interrupt handlers
+
+const TIM_TypeDef * const timer[] = { TIM1, TIM2, TIM3, TIM4, TIM5 };
+extern u8 stm32_timer_int_periodic_flag[ NUM_PHYS_TIMER ];
+
+static void tmr_int_handler( int id )
+{
+  TIM_TypeDef *base = ( TIM_TypeDef* )timer[ id ];
+
+  TIM_ClearITPendingBit( base, TIM_IT_CC1 );
+  if( id == VTMR_TIMER_ID )
+    cmn_virtual_timer_cb();
+  else
+    cmn_int_handler( INT_TMR_MATCH, id );
+  if( stm32_timer_int_periodic_flag[ id ] != PLATFORM_TIMER_INT_CYCLIC )\
+    TIM_ITConfig( base, TIM_IT_CC1, DISABLE );
+}
+
+
+void TIM1_CC_IRQHandler(void)
+{
+  tmr_int_handler( 0 );
+}
+
+void TIM2_IRQHandler(void)
+{
+  tmr_int_handler( 1 );
+}
+
+void TIM3_IRQHandler(void)
+{
+  tmr_int_handler( 2 );
+}
+
+void TIM4_IRQHandler(void)
+{
+  tmr_int_handler( 3 );
+}
+
+void TIM5_IRQHandler(void)
+{
+  tmr_int_handler( 4 );
+}
+
+void TIM8_CC_IRQHandler(void)
+{
+  tmr_int_handler( 7 );
+}
+
 // ****************************************************************************
 // GPIO helper functions
 
@@ -234,19 +288,30 @@ static int int_gpio_negedge_get_flag( elua_int_resnum resnum, int clear )
 // ****************************************************************************
 // Interrupt: INT_TMR_MATCH
 
-static int int_tmr_match_set_status( elua_int_resnum resnum, int status )
-{
-  return PLATFORM_INT_NOT_HANDLED;
-}
-
 static int int_tmr_match_get_status( elua_int_resnum resnum )
 {
-  return PLATFORM_INT_NOT_HANDLED;
+  TIM_TypeDef *base = ( TIM_TypeDef* )timer[ resnum ];
+
+  return ( base->DIER & TIM_IT_CC1 ) != 0;
+}
+
+static int int_tmr_match_set_status( elua_int_resnum resnum, int status )
+{
+  int previous = int_tmr_match_get_status( resnum );
+  TIM_TypeDef *base = ( TIM_TypeDef* )timer[ resnum ];
+  
+  TIM_ITConfig( base, TIM_IT_CC1, status == PLATFORM_CPU_ENABLE ? ENABLE : DISABLE );
+  return previous;
 }
 
 static int int_tmr_match_get_flag( elua_int_resnum resnum, int clear )
 {
-  return PLATFORM_INT_NOT_HANDLED;
+  TIM_TypeDef *base = ( TIM_TypeDef* )timer[ resnum ];
+  int status = TIM_GetFlagStatus( base, TIM_FLAG_CC1 );
+
+  if( clear )
+    TIM_ClearFlag( base, TIM_FLAG_CC1 );
+  return status;
 }
 
 // ****************************************************************************
@@ -287,6 +352,15 @@ static const u8 uart_irq_table[] = { USART1_IRQn, USART2_IRQn, USART3_IRQn, UART
 // EXTI IRQ table
 static const u8 exti_irq_table[] = { EXTI0_IRQn, EXTI1_IRQn, EXTI2_IRQn, EXTI3_IRQn, EXTI4_IRQn, EXTI9_5_IRQn, EXTI15_10_IRQn };
 
+// EXTI IRQ table
+#if defined( STM32F10X_LD )
+static const u8 timer_irq_table[] = { TIM1_CC_IRQn, TIM2_IRQn, TIM3_IRQn };
+#elseif defined( STM32F10X_MD )
+static const u8 timer_irq_table[] = { TIM1_CC_IRQn, TIM2_IRQn, TIM3_IRQn, TIM4_IRQn };
+#else
+static const u8 timer_irq_table[] = { TIM1_CC_IRQn, TIM2_IRQn, TIM3_IRQn, TIM4_IRQn, TIM5_IRQn };
+#endif
+
 void platform_int_init()
 {
   NVIC_InitTypeDef nvic_init_structure;
@@ -296,6 +370,7 @@ void platform_int_init()
   nvic_init_structure.NVIC_IRQChannelPreemptionPriority = 0;
   nvic_init_structure.NVIC_IRQChannelSubPriority = 0;
   nvic_init_structure.NVIC_IRQChannelCmd = ENABLE;
+
   for( i = 0; i < sizeof( uart_irq_table ) / sizeof( u8 ); i ++ )
   {
     nvic_init_structure.NVIC_IRQChannel = uart_irq_table[ i ];
@@ -309,6 +384,15 @@ void platform_int_init()
     NVIC_Init( &nvic_init_structure );
   }
 
+#ifdef INT_TMR_MATCH
+  for( i = 0; i < sizeof( timer_irq_table ) / sizeof( u8 ); i ++ )
+  {
+    nvic_init_structure.NVIC_IRQChannel = timer_irq_table[ i ];
+      nvic_init_structure.NVIC_IRQChannelSubPriority = 1;
+    NVIC_Init( &nvic_init_structure );
+  }
+#endif  
+
 }
 
 // ****************************************************************************