diff options
Diffstat (limited to 'platforms/arm/nrf52/arbiter_nrf52.h')
| -rw-r--r-- | platforms/arm/nrf52/arbiter_nrf52.h | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/platforms/arm/nrf52/arbiter_nrf52.h b/platforms/arm/nrf52/arbiter_nrf52.h new file mode 100644 index 00000000..5a6aa92a --- /dev/null +++ b/platforms/arm/nrf52/arbiter_nrf52.h @@ -0,0 +1,115 @@ +#ifndef __INC_ARBITER_NRF52 +#define __INC_ARBITER_NRF52 + +#if defined(NRF52_SERIES) + +#include "led_sysdefs_arm_nrf52.h" + +//FASTLED_NAMESPACE_BEGIN + +typedef void (*FASTLED_NRF52_PWM_INTERRUPT_HANDLER)(); + +// a trick learned from other embedded projects .. +// use the enum as an index to a statically-allocated array +// to store unique information for that instance. +// also provides a count of how many instances were enabled. +// +// See led_sysdefs_arm_nrf52.h for selection.... +// +typedef enum _FASTLED_NRF52_ENABLED_PWM_INSTANCE { +#if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE0) + FASTLED_NRF52_PWM0_INSTANCE_IDX, +#endif +#if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE1) + FASTLED_NRF52_PWM1_INSTANCE_IDX, +#endif +#if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE2) + FASTLED_NRF52_PWM2_INSTANCE_IDX, +#endif +#if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE3) + FASTLED_NRF52_PWM3_INSTANCE_IDX, +#endif + FASTLED_NRF52_PWM_INSTANCE_COUNT +} FASTLED_NRF52_ENABLED_PWM_INSTANCES; + +static_assert(FASTLED_NRF52_PWM_INSTANCE_COUNT > 0, "Instance count must be greater than zero -- define FASTLED_NRF52_ENABLE_PWM_INSTNACE[n] (replace `[n]` with digit)"); + +template <uint32_t _PWM_ID> +class PWM_Arbiter { + +private: + static_assert(_PWM_ID < 32, "PWM_ID over 31 breaks current arbitration bitmask"); + //const uint32_t _ACQUIRE_MASK = (1u << _PWM_ID) ; + //const uint32_t _CLEAR_MASK = ~((uint32_t)(1u << _PWM_ID)); + static uint32_t s_PwmInUse; + static NRF_PWM_Type * const s_PWM; + static IRQn_Type const s_PWM_IRQ; + static FASTLED_NRF52_PWM_INTERRUPT_HANDLER volatile s_Isr; + +public: + static void isr_handler() { + return s_Isr(); + } + FASTLED_NRF52_INLINE_ATTRIBUTE static bool isAcquired() { + return (0u != (s_PwmInUse & 1u)); // _ACQUIRE_MASK + } + FASTLED_NRF52_INLINE_ATTRIBUTE static void acquire(FASTLED_NRF52_PWM_INTERRUPT_HANDLER isr) { + while (!tryAcquire(isr)); + } + FASTLED_NRF52_INLINE_ATTRIBUTE static bool tryAcquire(FASTLED_NRF52_PWM_INTERRUPT_HANDLER isr) { + uint32_t oldValue = __sync_fetch_and_or(&s_PwmInUse, 1u); // _ACQUIRE_MASK + if (0u == (oldValue & 1u)) { // _ACQUIRE_MASK + s_Isr = isr; + return true; + } + return false; + } + FASTLED_NRF52_INLINE_ATTRIBUTE static void releaseFromIsr() { + uint32_t oldValue = __sync_fetch_and_and(&s_PwmInUse, ~1u); // _CLEAR_MASK + if (0u == (oldValue & 1u)) { // _ACQUIRE_MASK + // TODO: This should never be true... indicates was not held. + // Assert here? + (void)oldValue; + } + return; + } + FASTLED_NRF52_INLINE_ATTRIBUTE static NRF_PWM_Type * getPWM() { + return s_PWM; + } + FASTLED_NRF52_INLINE_ATTRIBUTE static IRQn_Type getIRQn() { return s_PWM_IRQ; } +}; +template <uint32_t _PWM_ID> NRF_PWM_Type * const PWM_Arbiter<_PWM_ID>::s_PWM = + #if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE0) + (_PWM_ID == 0 ? NRF_PWM0 : + #endif + #if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE1) + (_PWM_ID == 1 ? NRF_PWM1 : + #endif + #if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE2) + (_PWM_ID == 2 ? NRF_PWM2 : + #endif + #if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE3) + (_PWM_ID == 3 ? NRF_PWM3 : + #endif + (NRF_PWM_Type*)-1 + #if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE0) + ) + #endif + #if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE1) + ) + #endif + #if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE2) + ) + #endif + #if defined(FASTLED_NRF52_ENABLE_PWM_INSTANCE3) + ) + #endif + ; +template <uint32_t _PWM_ID> IRQn_Type const PWM_Arbiter<_PWM_ID>::s_PWM_IRQ = ((IRQn_Type)((uint8_t)((uint32_t)(s_PWM) >> 12))); +template <uint32_t _PWM_ID> uint32_t PWM_Arbiter<_PWM_ID>::s_PwmInUse = 0; +template <uint32_t _PWM_ID> FASTLED_NRF52_PWM_INTERRUPT_HANDLER volatile PWM_Arbiter<_PWM_ID>::s_Isr = NULL; + +//FASTLED_NAMESPACE_END + +#endif // NRF52_SERIES +#endif // __INC_ARBITER_NRF52
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