I2CRTOS Driver by Helmut Schmücker. Removed included mbed-rtos library to prevent multiple definition. Make sure to include mbed-rtos library in your program!
Fork of I2cRtosDriver by
I2CDriver.h@1:90455d5bdd8c, 2013-04-14 (annotated)
- Committer:
- humlet
- Date:
- Sun Apr 14 06:39:04 2013 +0000
- Revision:
- 1:90455d5bdd8c
- Parent:
- 0:13c962fecb13
- Child:
- 2:514105beb343
no more smoke
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
humlet | 0:13c962fecb13 | 1 | #ifndef I2CDRIVER_H |
humlet | 0:13c962fecb13 | 2 | #define I2CDRIVER_H |
humlet | 0:13c962fecb13 | 3 | |
humlet | 0:13c962fecb13 | 4 | #include "stdint.h" |
humlet | 0:13c962fecb13 | 5 | |
humlet | 0:13c962fecb13 | 6 | #include "I2C.h" |
humlet | 0:13c962fecb13 | 7 | |
humlet | 0:13c962fecb13 | 8 | #include "Thread.h" |
humlet | 0:13c962fecb13 | 9 | #include "Semaphore.h" |
humlet | 0:13c962fecb13 | 10 | #include "Mutex.h" |
humlet | 0:13c962fecb13 | 11 | |
humlet | 0:13c962fecb13 | 12 | namespace mbed |
humlet | 0:13c962fecb13 | 13 | { |
humlet | 0:13c962fecb13 | 14 | |
humlet | 0:13c962fecb13 | 15 | class I2CDriver : protected I2C |
humlet | 0:13c962fecb13 | 16 | { |
humlet | 0:13c962fecb13 | 17 | public: |
humlet | 0:13c962fecb13 | 18 | using I2C::RxStatus; |
humlet | 0:13c962fecb13 | 19 | using I2C::Acknowledge; |
humlet | 0:13c962fecb13 | 20 | using I2C::frequency; |
humlet | 0:13c962fecb13 | 21 | |
humlet | 0:13c962fecb13 | 22 | /** Create an I2C Master interface, connected to the specified pins |
humlet | 0:13c962fecb13 | 23 | * |
humlet | 0:13c962fecb13 | 24 | * @param sda I2C data line pin |
humlet | 0:13c962fecb13 | 25 | * @param scl I2C clock line pin |
humlet | 0:13c962fecb13 | 26 | */ |
humlet | 0:13c962fecb13 | 27 | I2CDriver(PinName sda, PinName scl); |
humlet | 0:13c962fecb13 | 28 | |
humlet | 0:13c962fecb13 | 29 | /** Read from an I2C slave |
humlet | 0:13c962fecb13 | 30 | * |
humlet | 0:13c962fecb13 | 31 | * Performs a complete read transaction. The bottom bit of |
humlet | 0:13c962fecb13 | 32 | * the address is forced to 1 to indicate a read. |
humlet | 0:13c962fecb13 | 33 | * |
humlet | 0:13c962fecb13 | 34 | * @param address 8-bit I2C slave address [ addr | 1 ] |
humlet | 0:13c962fecb13 | 35 | * @param data Pointer to the byte-array to read data in to |
humlet | 0:13c962fecb13 | 36 | * @param length Number of bytes to read |
humlet | 0:13c962fecb13 | 37 | * @param repeated Repeated start, true - don't send stop at end |
humlet | 0:13c962fecb13 | 38 | * |
humlet | 0:13c962fecb13 | 39 | * @returns |
humlet | 0:13c962fecb13 | 40 | * 0 on success (ack), |
humlet | 0:13c962fecb13 | 41 | * non-0 on failure (nack) |
humlet | 0:13c962fecb13 | 42 | */ |
humlet | 0:13c962fecb13 | 43 | int read(int address, char *data, int length, bool repeated = false); |
humlet | 0:13c962fecb13 | 44 | |
humlet | 1:90455d5bdd8c | 45 | int read(int address, uint8_t regist, char *data, int length, bool repeated = false); |
humlet | 1:90455d5bdd8c | 46 | |
humlet | 0:13c962fecb13 | 47 | /** Read a single byte from the I2C bus |
humlet | 0:13c962fecb13 | 48 | * |
humlet | 0:13c962fecb13 | 49 | * @param ack indicates if the byte is to be acknowledged (1 = acknowledge) |
humlet | 0:13c962fecb13 | 50 | * |
humlet | 0:13c962fecb13 | 51 | * @returns |
humlet | 0:13c962fecb13 | 52 | * the byte read |
humlet | 0:13c962fecb13 | 53 | */ |
humlet | 0:13c962fecb13 | 54 | int read(int ack); |
humlet | 0:13c962fecb13 | 55 | |
humlet | 0:13c962fecb13 | 56 | /** Write to an I2C slave |
humlet | 0:13c962fecb13 | 57 | * |
humlet | 0:13c962fecb13 | 58 | * Performs a complete write transaction. The bottom bit of |
humlet | 0:13c962fecb13 | 59 | * the address is forced to 0 to indicate a write. |
humlet | 0:13c962fecb13 | 60 | * |
humlet | 0:13c962fecb13 | 61 | * @param address 8-bit I2C slave address [ addr | 0 ] |
humlet | 0:13c962fecb13 | 62 | * @param data Pointer to the byte-array data to send |
humlet | 0:13c962fecb13 | 63 | * @param length Number of bytes to send |
humlet | 0:13c962fecb13 | 64 | * @param repeated Repeated start, true - do not send stop at end |
humlet | 0:13c962fecb13 | 65 | * |
humlet | 0:13c962fecb13 | 66 | * @returns |
humlet | 0:13c962fecb13 | 67 | * 0 on success (ack), |
humlet | 0:13c962fecb13 | 68 | * non-0 on failure (nack) |
humlet | 0:13c962fecb13 | 69 | */ |
humlet | 0:13c962fecb13 | 70 | int write(int address, const char *data, int length, bool repeated = false); |
humlet | 0:13c962fecb13 | 71 | |
humlet | 0:13c962fecb13 | 72 | /** Write single byte out on the I2C bus |
humlet | 0:13c962fecb13 | 73 | * |
humlet | 0:13c962fecb13 | 74 | * @param data data to write out on bus |
humlet | 0:13c962fecb13 | 75 | * |
humlet | 0:13c962fecb13 | 76 | * @returns |
humlet | 0:13c962fecb13 | 77 | * '1' if an ACK was received, |
humlet | 0:13c962fecb13 | 78 | * '0' otherwise |
humlet | 0:13c962fecb13 | 79 | */ |
humlet | 0:13c962fecb13 | 80 | int write(int data); |
humlet | 0:13c962fecb13 | 81 | |
humlet | 0:13c962fecb13 | 82 | /// Creates a start condition on the I2C bus |
humlet | 0:13c962fecb13 | 83 | void start(void); |
humlet | 0:13c962fecb13 | 84 | |
humlet | 0:13c962fecb13 | 85 | ///Creates a stop condition on the I2C bus |
humlet | 0:13c962fecb13 | 86 | void stop(void); |
humlet | 0:13c962fecb13 | 87 | |
humlet | 0:13c962fecb13 | 88 | /// Wait until the i2c driver becomes available. |
humlet | 1:90455d5bdd8c | 89 | void lock() { |
humlet | 0:13c962fecb13 | 90 | // if one and the same thread can lock twice, but then it needs also to unlock twice. |
humlet | 0:13c962fecb13 | 91 | // exactly what we need here |
humlet | 1:90455d5bdd8c | 92 | m_channel->mutex.lock(osWaitForever); |
humlet | 0:13c962fecb13 | 93 | } |
humlet | 0:13c962fecb13 | 94 | |
humlet | 0:13c962fecb13 | 95 | /// Unlock the driver that has previously been locked by the same thread |
humlet | 1:90455d5bdd8c | 96 | void unlock() { |
humlet | 1:90455d5bdd8c | 97 | m_channel->mutex.unlock(); |
humlet | 0:13c962fecb13 | 98 | } |
humlet | 0:13c962fecb13 | 99 | |
humlet | 0:13c962fecb13 | 100 | |
humlet | 0:13c962fecb13 | 101 | protected: |
humlet | 0:13c962fecb13 | 102 | |
humlet | 0:13c962fecb13 | 103 | enum Command { |
humlet | 0:13c962fecb13 | 104 | START, |
humlet | 0:13c962fecb13 | 105 | STOP, |
humlet | 0:13c962fecb13 | 106 | WRITE_BYTE, |
humlet | 0:13c962fecb13 | 107 | WRITE, |
humlet | 0:13c962fecb13 | 108 | READ_BYTE, |
humlet | 0:13c962fecb13 | 109 | READ, |
humlet | 0:13c962fecb13 | 110 | READ_FROM_REGISTER |
humlet | 1:90455d5bdd8c | 111 | }; |
humlet | 0:13c962fecb13 | 112 | |
humlet | 0:13c962fecb13 | 113 | struct Transfer { |
humlet | 1:90455d5bdd8c | 114 | osThreadId caller; |
humlet | 0:13c962fecb13 | 115 | Command cmd; |
humlet | 0:13c962fecb13 | 116 | int freq; |
humlet | 0:13c962fecb13 | 117 | int adr; |
humlet | 1:90455d5bdd8c | 118 | uint8_t reg; |
humlet | 0:13c962fecb13 | 119 | char* dta; |
humlet | 1:90455d5bdd8c | 120 | const char* wdta; |
humlet | 0:13c962fecb13 | 121 | int len; |
humlet | 1:90455d5bdd8c | 122 | int ack; |
humlet | 0:13c962fecb13 | 123 | bool rep; |
humlet | 1:90455d5bdd8c | 124 | int ret; |
humlet | 1:90455d5bdd8c | 125 | }; |
humlet | 0:13c962fecb13 | 126 | |
humlet | 0:13c962fecb13 | 127 | struct Channel { |
humlet | 1:90455d5bdd8c | 128 | volatile osThreadId driver; |
humlet | 1:90455d5bdd8c | 129 | rtos::Mutex mutex; |
humlet | 1:90455d5bdd8c | 130 | volatile Transfer transfer; |
humlet | 1:90455d5bdd8c | 131 | volatile int freq; |
humlet | 1:90455d5bdd8c | 132 | }; |
humlet | 0:13c962fecb13 | 133 | |
humlet | 1:90455d5bdd8c | 134 | static const PinName c_sdas[2]; |
humlet | 1:90455d5bdd8c | 135 | static const PinName c_scls[2]; |
humlet | 0:13c962fecb13 | 136 | |
humlet | 1:90455d5bdd8c | 137 | static Channel* s_channels[2]; |
humlet | 0:13c962fecb13 | 138 | |
humlet | 1:90455d5bdd8c | 139 | Channel* m_channel; |
humlet | 0:13c962fecb13 | 140 | |
humlet | 0:13c962fecb13 | 141 | static void channel_0_ISR(); |
humlet | 0:13c962fecb13 | 142 | static void channel_1_ISR(); |
humlet | 0:13c962fecb13 | 143 | |
humlet | 1:90455d5bdd8c | 144 | static void threadFun(void const *args); |
humlet | 0:13c962fecb13 | 145 | |
humlet | 0:13c962fecb13 | 146 | void sendNwait(); |
humlet | 0:13c962fecb13 | 147 | |
humlet | 1:90455d5bdd8c | 148 | }; |
humlet | 0:13c962fecb13 | 149 | } |
humlet | 0:13c962fecb13 | 150 | #endif |