Enable RGB Matrix

ports/stm/common-hal/rgbmatrix/RGBMatrix.c

@@ -27,17 +27,16 @@
 #include <stddef.h>
 
 #include "common-hal/rgbmatrix/RGBMatrix.h"
+#include "timers.h"
 
 #include STM32_HAL_H
 
 extern void _PM_IRQ_HANDLER(void);
 
 void *common_hal_rgbmatrix_timer_allocate() {
-    // TODO(jepler) properly handle resource allocation including never-reset
-    return TIM6;
+    return stm_peripherals_find_timer();
 }
 
-
 void common_hal_rgbmatrix_timer_enable(void* ptr) {
     HAL_NVIC_EnableIRQ(TIM6_DAC_IRQn);
 }

ports/stm/mpconfigport.mk

@@ -4,8 +4,8 @@ INTERNAL_LIBM ?= 1
 USB_SERIAL_NUMBER_LENGTH ?= 24
 
 ifeq ($(MCU_VARIANT),STM32F405xx)
-	CIRCUITPY_FRAMEBUFFERIO ?= 0
-	CIRCUITPY_RGBMATRIX ?= 0
+	CIRCUITPY_FRAMEBUFFERIO ?= 1
+	CIRCUITPY_RGBMATRIX ?= 1
 endif
 
 ifeq ($(MCU_SERIES),F4)

ports/stm/peripherals/timers.c

@@ -85,6 +85,11 @@ uint32_t stm_peripherals_timer_get_source_freq(TIM_TypeDef * timer) {
     return source;
 }
 
+size_t stm_peripherals_timer_get_irqnum(TIM_TypeDef * instance) {
+    size_t tim_id = stm_peripherals_timer_get_index(instance);
+    return irq_map[tim_id];
+}
+
 void timers_reset(void) {
     uint16_t never_reset_mask = 0x00;
     for (size_t i = 0; i < MP_ARRAY_SIZE(mcu_tim_banks); i++) {
@@ -120,6 +125,7 @@ TIM_TypeDef * stm_peripherals_find_timer(void) {
             return mcu_tim_banks[i];
         }
     }
+    //TODO: secondary search for timers outside the pins in the board profile
 
     // Work backwards - higher index timers have fewer pin allocations
     for (size_t i = (MP_ARRAY_SIZE(mcu_tim_banks) - 1); i >= 0; i--) {

ports/stm/peripherals/timers.h

@@ -41,6 +41,7 @@
 void tim_clock_enable(uint16_t mask);
 void tim_clock_disable(uint16_t mask);
 uint32_t stm_peripherals_timer_get_source_freq(TIM_TypeDef * timer);
+size_t stm_peripherals_timer_get_irqnum(TIM_TypeDef * instance);
 void timers_reset(void);
 TIM_TypeDef * stm_peripherals_find_timer(void);
 void stm_peripherals_timer_preinit(TIM_TypeDef * instance, uint8_t prio, void (*callback)(void));