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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,202 @@ | ||
| /* General C++ Object Thunking class | ||
| * | ||
| * - allows direct callbacks to non-static C++ class functions | ||
| * - keeps track for the corresponding class instance | ||
| * - supports an optional context parameter for the called function | ||
| * - ideally suited for class object receiving interrupts (NVIC_SetVector) | ||
| * | ||
| * Copyright (c) 2014-2015 ARM Limited | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| #ifndef __CTHUNK_H__ | ||
| #define __CTHUNK_H__ | ||
|
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| #define CTHUNK_ADDRESS 1 | ||
|
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| #if defined(__CORTEX_M3) || defined(__CORTEX_M4) || defined(__thumb2__) | ||
| #define CTHUNK_VARIABLES volatile uint32_t code[1] | ||
| /** | ||
| * CTHUNK disassembly for Cortex-M3/M4 (thumb2): | ||
| * * ldm.w pc,{r0,r1,r2,pc} | ||
| * | ||
| * This instruction loads the arguments for the static thunking function to r0-r2, and | ||
| * branches to that function by loading its address into PC. | ||
| * | ||
| * This is safe for both regular calling and interrupt calling, since it only touches scratch registers | ||
| * which should be saved by the caller, and are automatically saved as part of the IRQ context switch. | ||
| */ | ||
| #define CTHUNK_ASSIGMENT m_thunk.code[0] = 0x8007E89F | ||
|
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| #elif defined(__CORTEX_M0PLUS) || defined(__CORTEX_M0) | ||
| /* | ||
| * CTHUNK disassembly for Cortex M0 (thumb): | ||
| * * push {r0,r1,r2,r3,r4,lr} save touched registers and return address | ||
| * * movs r4,#4 set up address to load arguments from (immediately following this code block) (1) | ||
| * * add r4,pc set up address to load arguments from (immediately following this code block) (2) | ||
| * * ldm r4!,{r0,r1,r2,r3} load arguments for static thunk function | ||
| * * blx r3 call static thunk function | ||
| * * pop {r0,r1,r2,r3,r4,pc} restore scratch registers and return from function | ||
| */ | ||
| #define CTHUNK_VARIABLES volatile uint32_t code[3] | ||
| #define CTHUNK_ASSIGMENT do { \ | ||
| m_thunk.code[0] = 0x2404B51F; \ | ||
| m_thunk.code[1] = 0xCC0F447C; \ | ||
| m_thunk.code[2] = 0xBD1F4798; \ | ||
| } while (0) | ||
|
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| #else | ||
| #error "Target is not currently suported." | ||
| #endif | ||
|
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| /* IRQ/Exception compatible thunk entry function */ | ||
| typedef void (*CThunkEntry)(void); | ||
|
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| template<class T> | ||
| class CThunk | ||
| { | ||
| public: | ||
| typedef void (T::*CCallbackSimple)(void); | ||
| typedef void (T::*CCallback)(void* context); | ||
|
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| inline CThunk(T *instance) | ||
| { | ||
| init(instance, NULL, NULL); | ||
| } | ||
|
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| inline CThunk(T *instance, CCallback callback) | ||
| { | ||
| init(instance, callback, NULL); | ||
| } | ||
|
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| ~CThunk() { | ||
|
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| } | ||
|
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| inline CThunk(T *instance, CCallbackSimple callback) | ||
| { | ||
| init(instance, (CCallback)callback, NULL); | ||
| } | ||
|
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| inline CThunk(T &instance, CCallback callback) | ||
| { | ||
| init(instance, callback, NULL); | ||
| } | ||
|
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| inline CThunk(T &instance, CCallbackSimple callback) | ||
| { | ||
| init(instance, (CCallback)callback, NULL); | ||
| } | ||
|
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| inline CThunk(T &instance, CCallback callback, void* context) | ||
| { | ||
| init(instance, callback, context); | ||
| } | ||
|
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| inline void callback(CCallback callback) | ||
| { | ||
| m_callback = callback; | ||
| } | ||
|
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| inline void callback(CCallbackSimple callback) | ||
| { | ||
| m_callback = (CCallback)callback; | ||
| } | ||
|
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| inline void context(void* context) | ||
| { | ||
| m_thunk.context = (uint32_t)context; | ||
| } | ||
|
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| inline void context(uint32_t context) | ||
| { | ||
| m_thunk.context = context; | ||
| } | ||
|
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| inline uint32_t entry(void) | ||
| { | ||
| return (((uint32_t)&m_thunk)|CTHUNK_ADDRESS); | ||
| } | ||
|
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| /* get thunk entry point for connecting rhunk to an IRQ table */ | ||
| inline operator CThunkEntry(void) | ||
| { | ||
| return (CThunkEntry)entry(); | ||
| } | ||
|
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| /* get thunk entry point for connecting rhunk to an IRQ table */ | ||
| inline operator uint32_t(void) | ||
| { | ||
| return entry(); | ||
| } | ||
|
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| /* simple test function */ | ||
| inline void call(void) | ||
| { | ||
| (((CThunkEntry)(entry()))()); | ||
| } | ||
|
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| private: | ||
| T* m_instance; | ||
| volatile CCallback m_callback; | ||
|
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| // TODO: this needs proper fix, to refactor toolchain header file and all its use | ||
| // PACKED there is not defined properly for IAR | ||
| #if defined (__ICCARM__) | ||
| typedef __packed struct | ||
| { | ||
| CTHUNK_VARIABLES; | ||
| volatile uint32_t instance; | ||
| volatile uint32_t context; | ||
| volatile uint32_t callback; | ||
| volatile uint32_t trampoline; | ||
| } CThunkTrampoline; | ||
| #else | ||
| typedef struct | ||
| { | ||
| CTHUNK_VARIABLES; | ||
| volatile uint32_t instance; | ||
| volatile uint32_t context; | ||
| volatile uint32_t callback; | ||
| volatile uint32_t trampoline; | ||
| } __attribute__((__packed__)) CThunkTrampoline; | ||
| #endif | ||
|
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| static void trampoline(T* instance, void* context, CCallback* callback) | ||
| { | ||
| if(instance && *callback) { | ||
| (static_cast<T*>(instance)->**callback)(context); | ||
| } | ||
| } | ||
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| volatile CThunkTrampoline m_thunk; | ||
|
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| inline void init(T *instance, CCallback callback, void* context) | ||
| { | ||
| /* remember callback - need to add this level of redirection | ||
| as pointer size for member functions differs between platforms */ | ||
| m_callback = callback; | ||
|
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| /* populate thunking trampoline */ | ||
| CTHUNK_ASSIGMENT; | ||
| m_thunk.context = (uint32_t)context; | ||
| m_thunk.instance = (uint32_t)instance; | ||
| m_thunk.callback = (uint32_t)&m_callback; | ||
| m_thunk.trampoline = (uint32_t)&trampoline; | ||
|
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| __ISB(); | ||
| __DSB(); | ||
| } | ||
| }; | ||
|
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| #endif/*__CTHUNK_H__*/ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* mbed Microcontroller Library | ||
| * Copyright (c) 2015 ARM Limited | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| #ifndef MBED_CIRCULARBUFFER_H | ||
| #define MBED_CIRCULARBUFFER_H | ||
|
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| namespace mbed { | ||
|
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| /** Templated Circular buffer class | ||
| */ | ||
| template<typename T, uint32_t BufferSize, typename CounterType = uint32_t> | ||
| class CircularBuffer { | ||
| public: | ||
| CircularBuffer() : _head(0), _tail(0), _full(false) { | ||
| } | ||
|
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| ~CircularBuffer() { | ||
| } | ||
|
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| /** Push the transaction to the buffer. This overwrites the buffer if it's | ||
| * full | ||
| * | ||
| * @param data Data to be pushed to the buffer | ||
| */ | ||
| void push(const T& data) { | ||
| if (full()) { | ||
| _tail++; | ||
| _tail %= BufferSize; | ||
| } | ||
| _pool[_head++] = data; | ||
| _head %= BufferSize; | ||
| if (_head == _tail) { | ||
| _full = true; | ||
| } | ||
| } | ||
|
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| /** Pop the transaction from the buffer | ||
| * | ||
| * @param data Data to be pushed to the buffer | ||
| * @return True if the buffer is not empty and data contains a transaction, false otherwise | ||
| */ | ||
| bool pop(T& data) { | ||
| if (!empty()) { | ||
| data = _pool[_tail++]; | ||
| _tail %= BufferSize; | ||
| _full = false; | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
|
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| /** Check if the buffer is empty | ||
| * | ||
| * @return True if the buffer is empty, false if not | ||
| */ | ||
| bool empty() { | ||
| return (_head == _tail) && !_full; | ||
| } | ||
|
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| /** Check if the buffer is full | ||
| * | ||
| * @return True if the buffer is full, false if not | ||
| */ | ||
| bool full() { | ||
| return _full; | ||
| } | ||
|
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| /** Reset the buffer | ||
| * | ||
| */ | ||
| void reset() { | ||
| _head = 0; | ||
| _tail = 0; | ||
| _full = false; | ||
| } | ||
|
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| private: | ||
| T _pool[BufferSize]; | ||
| CounterType _head; | ||
| CounterType _tail; | ||
| bool _full; | ||
| }; | ||
|
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| } | ||
|
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| #endif |
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