A simple library to access the DMA functionality.
Fork of SimpleDMA by
SimpleDMA.h@1:0b73b00bcee8, 2013-12-20 (annotated)
- Committer:
- Sissors
- Date:
- Fri Dec 20 20:48:17 2013 +0000
- Revision:
- 1:0b73b00bcee8
- Parent:
- 0:d77ea45fa625
- Child:
- 2:fe2fcaa72434
v0.2, KL25, interrupts
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Sissors | 0:d77ea45fa625 | 1 | #ifndef SIMPLEDMA_H |
Sissors | 0:d77ea45fa625 | 2 | #define SIMPLEDMA_H |
Sissors | 0:d77ea45fa625 | 3 | |
Sissors | 0:d77ea45fa625 | 4 | #include "mbed.h" |
Sissors | 1:0b73b00bcee8 | 5 | #include "rtos.h" |
Sissors | 0:d77ea45fa625 | 6 | #include "SimpleDMA_KL25.h" |
Sissors | 0:d77ea45fa625 | 7 | |
Sissors | 0:d77ea45fa625 | 8 | |
Sissors | 0:d77ea45fa625 | 9 | /** |
Sissors | 0:d77ea45fa625 | 10 | * SimpleDMA, DMA made simple! (Okay that was bad) |
Sissors | 0:d77ea45fa625 | 11 | * |
Sissors | 0:d77ea45fa625 | 12 | * A class to easily make basic DMA operations happen. Not all features |
Sissors | 0:d77ea45fa625 | 13 | * of the DMA peripherals are used, but the main ones are: From and to memory |
Sissors | 0:d77ea45fa625 | 14 | * and peripherals, either continiously or triggered |
Sissors | 0:d77ea45fa625 | 15 | */ |
Sissors | 0:d77ea45fa625 | 16 | class SimpleDMA { |
Sissors | 0:d77ea45fa625 | 17 | public: |
Sissors | 0:d77ea45fa625 | 18 | SimpleDMA(int channel = 0); |
Sissors | 0:d77ea45fa625 | 19 | |
Sissors | 0:d77ea45fa625 | 20 | /** |
Sissors | 0:d77ea45fa625 | 21 | * Set the source of the DMA transfer |
Sissors | 0:d77ea45fa625 | 22 | * |
Sissors | 0:d77ea45fa625 | 23 | * Autoincrement increments the pointer after each transfer. If the source |
Sissors | 0:d77ea45fa625 | 24 | * is an array this should be true, if it is a peripheral or a single memory |
Sissors | 0:d77ea45fa625 | 25 | * location it should be false. |
Sissors | 0:d77ea45fa625 | 26 | * |
Sissors | 0:d77ea45fa625 | 27 | * The source can be any pointer to any memory location. Automatically |
Sissors | 0:d77ea45fa625 | 28 | * the wordsize is calculated depending on the type, if required you can |
Sissors | 0:d77ea45fa625 | 29 | * also override this. |
Sissors | 0:d77ea45fa625 | 30 | * |
Sissors | 0:d77ea45fa625 | 31 | * @param pointer - pointer to the memory location |
Sissors | 0:d77ea45fa625 | 32 | * @param autoinc - should the pointer be incremented by the DMA module |
Sissors | 0:d77ea45fa625 | 33 | * @param size - size of the transfer (optional, generally can be omitted) |
Sissors | 0:d77ea45fa625 | 34 | * @return - 0 on success |
Sissors | 0:d77ea45fa625 | 35 | */ |
Sissors | 0:d77ea45fa625 | 36 | template<typename Type> |
Sissors | 0:d77ea45fa625 | 37 | int source(Type* pointer, bool autoinc, int size = sizeof(Type*)) { |
Sissors | 0:d77ea45fa625 | 38 | return setMemory((uint32_t)pointer, size, true, autoinc); |
Sissors | 0:d77ea45fa625 | 39 | } |
Sissors | 0:d77ea45fa625 | 40 | |
Sissors | 0:d77ea45fa625 | 41 | /** |
Sissors | 0:d77ea45fa625 | 42 | * Set the destination of the DMA transfer |
Sissors | 0:d77ea45fa625 | 43 | * |
Sissors | 0:d77ea45fa625 | 44 | * Autoincrement increments the pointer after each transfer. If the source |
Sissors | 0:d77ea45fa625 | 45 | * is an array this should be true, if it is a peripheral or a single memory |
Sissors | 0:d77ea45fa625 | 46 | * location it should be false. |
Sissors | 0:d77ea45fa625 | 47 | * |
Sissors | 0:d77ea45fa625 | 48 | * The destination can be any pointer to any memory location. Automatically |
Sissors | 0:d77ea45fa625 | 49 | * the wordsize is calculated depending on the type, if required you can |
Sissors | 0:d77ea45fa625 | 50 | * also override this. |
Sissors | 0:d77ea45fa625 | 51 | * |
Sissors | 0:d77ea45fa625 | 52 | * @param pointer - pointer to the memory location |
Sissors | 0:d77ea45fa625 | 53 | * @param autoinc - should the pointer be incremented by the DMA module |
Sissors | 0:d77ea45fa625 | 54 | * @param size - size of the transfer (optional, generally can be omitted) |
Sissors | 0:d77ea45fa625 | 55 | * @return - 0 on success |
Sissors | 0:d77ea45fa625 | 56 | */ |
Sissors | 0:d77ea45fa625 | 57 | template<typename Type> |
Sissors | 0:d77ea45fa625 | 58 | int destination(Type* pointer, bool autoinc, int size = sizeof(Type*)) { |
Sissors | 0:d77ea45fa625 | 59 | return setMemory((uint32_t)pointer, size, false, autoinc); |
Sissors | 0:d77ea45fa625 | 60 | } |
Sissors | 0:d77ea45fa625 | 61 | |
Sissors | 0:d77ea45fa625 | 62 | /** |
Sissors | 0:d77ea45fa625 | 63 | * Set the trigger for the DMA operation |
Sissors | 0:d77ea45fa625 | 64 | * |
Sissors | 0:d77ea45fa625 | 65 | * In SimpleDMA_[yourdevice].h you can find the names of the different triggers. |
Sissors | 0:d77ea45fa625 | 66 | * Trigger_ALWAYS is defined for all devices, it will simply move the data |
Sissors | 0:d77ea45fa625 | 67 | * as fast as possible. Used for memory-memory transfers. If nothing else is set |
Sissors | 0:d77ea45fa625 | 68 | * that will be used by default. |
Sissors | 0:d77ea45fa625 | 69 | * |
Sissors | 0:d77ea45fa625 | 70 | * @param trig - trigger to use |
Sissors | 0:d77ea45fa625 | 71 | * @param return - 0 on success |
Sissors | 0:d77ea45fa625 | 72 | */ |
Sissors | 0:d77ea45fa625 | 73 | int trigger(SimpleDMA_Trigger trig); |
Sissors | 0:d77ea45fa625 | 74 | |
Sissors | 0:d77ea45fa625 | 75 | /** |
Sissors | 0:d77ea45fa625 | 76 | * Start the transfer |
Sissors | 0:d77ea45fa625 | 77 | * |
Sissors | 0:d77ea45fa625 | 78 | * @param length - number of BYTES to be moved by the DMA |
Sissors | 0:d77ea45fa625 | 79 | */ |
Sissors | 0:d77ea45fa625 | 80 | int start(int length); |
Sissors | 0:d77ea45fa625 | 81 | |
Sissors | 0:d77ea45fa625 | 82 | /** |
Sissors | 0:d77ea45fa625 | 83 | * Is the DMA channel busy |
Sissors | 0:d77ea45fa625 | 84 | * |
Sissors | 0:d77ea45fa625 | 85 | * @return - true if it is busy |
Sissors | 0:d77ea45fa625 | 86 | */ |
Sissors | 0:d77ea45fa625 | 87 | bool isBusy( void ); |
Sissors | 0:d77ea45fa625 | 88 | |
Sissors | 1:0b73b00bcee8 | 89 | /** |
Sissors | 1:0b73b00bcee8 | 90 | * Attach an interrupt upon completion of DMA transfer or error |
Sissors | 1:0b73b00bcee8 | 91 | * |
Sissors | 1:0b73b00bcee8 | 92 | * @param function - function to call upon completion (may be a member function) |
Sissors | 1:0b73b00bcee8 | 93 | */ |
Sissors | 1:0b73b00bcee8 | 94 | void attach(void (*function)(void)) { |
Sissors | 1:0b73b00bcee8 | 95 | irq_en = function; |
Sissors | 1:0b73b00bcee8 | 96 | _callback.attach(function); |
Sissors | 1:0b73b00bcee8 | 97 | } |
Sissors | 1:0b73b00bcee8 | 98 | |
Sissors | 1:0b73b00bcee8 | 99 | template<typename T> |
Sissors | 1:0b73b00bcee8 | 100 | void attach(T *object, void (T::*member)(void)) { |
Sissors | 1:0b73b00bcee8 | 101 | irq_en = object; |
Sissors | 1:0b73b00bcee8 | 102 | _callback.attach(object, member); |
Sissors | 1:0b73b00bcee8 | 103 | } |
Sissors | 0:d77ea45fa625 | 104 | |
Sissors | 1:0b73b00bcee8 | 105 | void wait(void) { |
Sissors | 1:0b73b00bcee8 | 106 | id = Thread::gettid(); |
Sissors | 1:0b73b00bcee8 | 107 | this->attach(this, &SimpleDMA::waitCallback); |
Sissors | 1:0b73b00bcee8 | 108 | this->start(8); |
Sissors | 1:0b73b00bcee8 | 109 | Thread::signal_wait(0x1); |
Sissors | 1:0b73b00bcee8 | 110 | } |
Sissors | 0:d77ea45fa625 | 111 | |
Sissors | 0:d77ea45fa625 | 112 | |
Sissors | 0:d77ea45fa625 | 113 | protected: |
Sissors | 1:0b73b00bcee8 | 114 | /** |
Sissors | 1:0b73b00bcee8 | 115 | * Set the DMA channel |
Sissors | 1:0b73b00bcee8 | 116 | * |
Sissors | 1:0b73b00bcee8 | 117 | * @param chan - DMA channel to use |
Sissors | 1:0b73b00bcee8 | 118 | */ |
Sissors | 1:0b73b00bcee8 | 119 | void channel(int chan); |
Sissors | 1:0b73b00bcee8 | 120 | |
Sissors | 0:d77ea45fa625 | 121 | int setMemory(uint32_t address, int wordsize, bool source, bool autoinc); |
Sissors | 0:d77ea45fa625 | 122 | int _channel; |
Sissors | 1:0b73b00bcee8 | 123 | FunctionPointer _callback; |
Sissors | 1:0b73b00bcee8 | 124 | bool irq_en; |
Sissors | 1:0b73b00bcee8 | 125 | void irq_handler(void); |
Sissors | 0:d77ea45fa625 | 126 | |
Sissors | 1:0b73b00bcee8 | 127 | //IRQ handlers |
Sissors | 0:d77ea45fa625 | 128 | |
Sissors | 1:0b73b00bcee8 | 129 | static SimpleDMA *irq_owner[4]; |
Sissors | 1:0b73b00bcee8 | 130 | |
Sissors | 1:0b73b00bcee8 | 131 | static void irq_handler0( void ) { |
Sissors | 1:0b73b00bcee8 | 132 | if (irq_owner[0]!=NULL) |
Sissors | 1:0b73b00bcee8 | 133 | irq_owner[0]->irq_handler(); |
Sissors | 1:0b73b00bcee8 | 134 | } |
Sissors | 1:0b73b00bcee8 | 135 | static void irq_handler1( void ) { |
Sissors | 1:0b73b00bcee8 | 136 | if (irq_owner[1]!=NULL) |
Sissors | 1:0b73b00bcee8 | 137 | irq_owner[1]->irq_handler(); |
Sissors | 1:0b73b00bcee8 | 138 | } |
Sissors | 1:0b73b00bcee8 | 139 | static void irq_handler2( void ) { |
Sissors | 1:0b73b00bcee8 | 140 | if (irq_owner[2]!=NULL) |
Sissors | 1:0b73b00bcee8 | 141 | irq_owner[2]->irq_handler(); |
Sissors | 1:0b73b00bcee8 | 142 | } |
Sissors | 1:0b73b00bcee8 | 143 | static void irq_handler3( void ) { |
Sissors | 1:0b73b00bcee8 | 144 | if (irq_owner[3]!=NULL) |
Sissors | 1:0b73b00bcee8 | 145 | irq_owner[3]->irq_handler(); |
Sissors | 1:0b73b00bcee8 | 146 | } |
Sissors | 1:0b73b00bcee8 | 147 | public: |
Sissors | 1:0b73b00bcee8 | 148 | osThreadId id; |
Sissors | 1:0b73b00bcee8 | 149 | void waitCallback(void) { |
Sissors | 1:0b73b00bcee8 | 150 | |
Sissors | 1:0b73b00bcee8 | 151 | //id = Thread::gettid(); |
Sissors | 1:0b73b00bcee8 | 152 | osSignalSet(id, 0x1); |
Sissors | 1:0b73b00bcee8 | 153 | |
Sissors | 1:0b73b00bcee8 | 154 | } |
Sissors | 0:d77ea45fa625 | 155 | |
Sissors | 0:d77ea45fa625 | 156 | }; |
Sissors | 0:d77ea45fa625 | 157 | #endif |