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.cpp@3:967dde37e712, 2013-04-19 (annotated)
- Committer:
- humlet
- Date:
- Fri Apr 19 21:33:29 2013 +0000
- Revision:
- 3:967dde37e712
- Parent:
- 2:514105beb343
- Child:
- 4:eafa7efcd771
refactored, compiles and crashes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
humlet | 0:13c962fecb13 | 1 | #include "I2CDriver.h" |
humlet | 3:967dde37e712 | 2 | #include "i2c_api.h" |
humlet | 0:13c962fecb13 | 3 | #include "error.h" |
humlet | 0:13c962fecb13 | 4 | |
humlet | 1:90455d5bdd8c | 5 | using namespace mbed; |
humlet | 1:90455d5bdd8c | 6 | using namespace rtos; |
humlet | 0:13c962fecb13 | 7 | |
humlet | 2:514105beb343 | 8 | #define I2C_ISR_DRV_SIG (1<<7) |
humlet | 1:90455d5bdd8c | 9 | #define DRV_USR_SIG (1<<6) |
humlet | 1:90455d5bdd8c | 10 | |
humlet | 1:90455d5bdd8c | 11 | const PinName I2CDriver::c_sdas[] = {p9,p28}; |
humlet | 1:90455d5bdd8c | 12 | const PinName I2CDriver::c_scls[] = {p10,p27}; |
humlet | 1:90455d5bdd8c | 13 | |
humlet | 1:90455d5bdd8c | 14 | I2CDriver::Channel* I2CDriver::s_channels[2] = {0,0}; |
humlet | 0:13c962fecb13 | 15 | |
humlet | 0:13c962fecb13 | 16 | |
humlet | 0:13c962fecb13 | 17 | void I2CDriver::channel_0_ISR() |
humlet | 0:13c962fecb13 | 18 | { |
humlet | 2:514105beb343 | 19 | osSignalSet( s_channels[0]->driver, I2C_ISR_DRV_SIG); |
humlet | 1:90455d5bdd8c | 20 | NVIC_DisableIRQ(I2C1_IRQn); |
humlet | 0:13c962fecb13 | 21 | } |
humlet | 0:13c962fecb13 | 22 | |
humlet | 0:13c962fecb13 | 23 | |
humlet | 0:13c962fecb13 | 24 | void I2CDriver::channel_1_ISR() |
humlet | 0:13c962fecb13 | 25 | { |
humlet | 2:514105beb343 | 26 | osSignalSet( s_channels[1]->driver, I2C_ISR_DRV_SIG); |
humlet | 1:90455d5bdd8c | 27 | #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) |
humlet | 1:90455d5bdd8c | 28 | NVIC_DisableIRQ(I2C2_IRQn); |
humlet | 1:90455d5bdd8c | 29 | #elif defined(TARGET_LPC11U24) |
humlet | 1:90455d5bdd8c | 30 | NVIC_DisableIRQ(I2C_IRQn); |
humlet | 1:90455d5bdd8c | 31 | #endif |
humlet | 0:13c962fecb13 | 32 | } |
humlet | 0:13c962fecb13 | 33 | |
humlet | 0:13c962fecb13 | 34 | |
humlet | 3:967dde37e712 | 35 | I2CDriver::I2CDriver(PinName sda, PinName scl, int hz, int slaveAdr):m_freq(hz),m_slaveAdr(slaveAdr) |
humlet | 3:967dde37e712 | 36 | { |
humlet | 3:967dde37e712 | 37 | // check pins and determine i2c channel |
humlet | 3:967dde37e712 | 38 | int channel=0; |
humlet | 3:967dde37e712 | 39 | #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) |
humlet | 3:967dde37e712 | 40 | if(sda==c_sdas[0] && scl==c_scls[0]) channel=0; // I2C_1 |
humlet | 3:967dde37e712 | 41 | else |
humlet | 3:967dde37e712 | 42 | #endif |
humlet | 3:967dde37e712 | 43 | if (sda==c_sdas[1] && scl==c_scls[1]) channel=1; //I2C_2 or I2C |
humlet | 3:967dde37e712 | 44 | else error("I2CDriver: Invalid I2C pinns selected"); |
humlet | 3:967dde37e712 | 45 | |
humlet | 3:967dde37e712 | 46 | if(s_channels[channel]==0) |
humlet | 3:967dde37e712 | 47 | new Thread(threadFun,(void *)channel,osPriorityRealtime,512); |
humlet | 3:967dde37e712 | 48 | m_channel = s_channels[channel]; |
humlet | 3:967dde37e712 | 49 | } |
humlet | 3:967dde37e712 | 50 | |
humlet | 3:967dde37e712 | 51 | |
humlet | 1:90455d5bdd8c | 52 | void I2CDriver::threadFun(void const *args) |
humlet | 0:13c962fecb13 | 53 | { |
humlet | 0:13c962fecb13 | 54 | int channelIdx = (int)args; |
humlet | 0:13c962fecb13 | 55 | Channel channel; |
humlet | 0:13c962fecb13 | 56 | s_channels[channelIdx] = &channel; |
humlet | 2:514105beb343 | 57 | channel.driver = Thread::gettid(); |
humlet | 0:13c962fecb13 | 58 | |
humlet | 1:90455d5bdd8c | 59 | #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) |
humlet | 0:13c962fecb13 | 60 | if(channelIdx==0)NVIC_SetVector(I2C1_IRQn, (uint32_t)I2CDriver::channel_0_ISR); |
humlet | 0:13c962fecb13 | 61 | if(channelIdx==1)NVIC_SetVector(I2C2_IRQn, (uint32_t)I2CDriver::channel_1_ISR); |
humlet | 1:90455d5bdd8c | 62 | #elif defined(TARGET_LPC11U24) |
humlet | 1:90455d5bdd8c | 63 | NVIC_SetVector(I2C_IRQn, (uint32_t)I2CDriver::channel_1_ISR); |
humlet | 1:90455d5bdd8c | 64 | #endif |
humlet | 2:514105beb343 | 65 | |
humlet | 3:967dde37e712 | 66 | int freq = 0; |
humlet | 3:967dde37e712 | 67 | int adrSlave = 0; |
humlet | 3:967dde37e712 | 68 | int modeSlave = 0; |
humlet | 3:967dde37e712 | 69 | i2c_t i2c; |
humlet | 3:967dde37e712 | 70 | i2c_init(&i2c, c_sdas[channelIdx], c_scls[channelIdx]); |
humlet | 2:514105beb343 | 71 | |
humlet | 1:90455d5bdd8c | 72 | volatile Transfer& tr = channel.transfer; |
humlet | 0:13c962fecb13 | 73 | while(1) { |
humlet | 1:90455d5bdd8c | 74 | // wait for requests |
humlet | 1:90455d5bdd8c | 75 | osSignalWait(DRV_USR_SIG,osWaitForever); |
humlet | 3:967dde37e712 | 76 | |
humlet | 1:90455d5bdd8c | 77 | // check and adapt frequency |
humlet | 3:967dde37e712 | 78 | if(freq != tr.freq) { |
humlet | 3:967dde37e712 | 79 | freq = tr.freq; |
humlet | 3:967dde37e712 | 80 | i2c_frequency(&i2c, tr.freq); |
humlet | 1:90455d5bdd8c | 81 | } |
humlet | 3:967dde37e712 | 82 | |
humlet | 3:967dde37e712 | 83 | // check and adapt slave/master mode |
humlet | 3:967dde37e712 | 84 | if(modeSlave != tr.slv) { |
humlet | 3:967dde37e712 | 85 | modeSlave = tr.slv; |
humlet | 3:967dde37e712 | 86 | i2c_slave_mode(&i2c, tr.slv); |
humlet | 3:967dde37e712 | 87 | } |
humlet | 3:967dde37e712 | 88 | |
humlet | 3:967dde37e712 | 89 | // check and adapt slave address |
humlet | 3:967dde37e712 | 90 | int adr = (tr.adr & 0xFF) | 1; |
humlet | 3:967dde37e712 | 91 | if(tr.slv && adrSlave != adr) { |
humlet | 3:967dde37e712 | 92 | adrSlave = adr; |
humlet | 3:967dde37e712 | 93 | i2c_slave_address(&i2c, 0, adr, 0); |
humlet | 3:967dde37e712 | 94 | } |
humlet | 3:967dde37e712 | 95 | |
humlet | 1:90455d5bdd8c | 96 | // just doit |
humlet | 1:90455d5bdd8c | 97 | switch(tr.cmd) { |
humlet | 0:13c962fecb13 | 98 | case START: |
humlet | 3:967dde37e712 | 99 | i2c_start(&i2c); |
humlet | 0:13c962fecb13 | 100 | break; |
humlet | 0:13c962fecb13 | 101 | case STOP: |
humlet | 3:967dde37e712 | 102 | i2c_stop(&i2c); |
humlet | 0:13c962fecb13 | 103 | break; |
humlet | 3:967dde37e712 | 104 | case READ_MST: |
humlet | 3:967dde37e712 | 105 | tr.ret = i2c_read(&i2c, tr.adr, tr.dta, tr.len, (tr.rep?0:1)); |
humlet | 1:90455d5bdd8c | 106 | break; |
humlet | 3:967dde37e712 | 107 | case READ_MST_REG: |
humlet | 3:967dde37e712 | 108 | tr.ret = i2c_write(&i2c, tr.adr,(const char*)&(tr.reg), 1, 0); |
humlet | 1:90455d5bdd8c | 109 | if(tr.ret)break; // error => bail out |
humlet | 3:967dde37e712 | 110 | tr.ret = i2c_read(&i2c, tr.adr, tr.dta, tr.len, (tr.rep?0:1)); |
humlet | 3:967dde37e712 | 111 | break; |
humlet | 3:967dde37e712 | 112 | case READ_SLV: |
humlet | 3:967dde37e712 | 113 | tr.ret = i2c_slave_read(&i2c, tr.dta, tr.len); |
humlet | 1:90455d5bdd8c | 114 | break; |
humlet | 1:90455d5bdd8c | 115 | case READ_BYTE: |
humlet | 3:967dde37e712 | 116 | tr.ret = i2c_byte_read(&i2c, (tr.ack?0:1)); |
humlet | 1:90455d5bdd8c | 117 | break; |
humlet | 3:967dde37e712 | 118 | case WRITE_MST: |
humlet | 3:967dde37e712 | 119 | tr.ret = i2c_write(&i2c, tr.adr, tr.wdta, tr.len, (tr.rep?0:1)); |
humlet | 3:967dde37e712 | 120 | break; |
humlet | 3:967dde37e712 | 121 | case WRITE_SLV: |
humlet | 3:967dde37e712 | 122 | tr.ret = i2c_slave_write(&i2c, tr.wdta, tr.len); |
humlet | 1:90455d5bdd8c | 123 | break; |
humlet | 1:90455d5bdd8c | 124 | case WRITE_BYTE: |
humlet | 3:967dde37e712 | 125 | tr.ret = i2c_byte_write(&i2c, tr.ack); |
humlet | 1:90455d5bdd8c | 126 | break; |
humlet | 3:967dde37e712 | 127 | case RECEIVE: |
humlet | 3:967dde37e712 | 128 | tr.ret = i2c_slave_receive_rtos(&i2c, tr.tmout); |
humlet | 1:90455d5bdd8c | 129 | default: |
humlet | 1:90455d5bdd8c | 130 | error("call 911"); |
humlet | 0:13c962fecb13 | 131 | } |
humlet | 1:90455d5bdd8c | 132 | // inform the caller |
humlet | 1:90455d5bdd8c | 133 | osSignalSet( channel.transfer.caller, DRV_USR_SIG); |
humlet | 0:13c962fecb13 | 134 | } |
humlet | 0:13c962fecb13 | 135 | } |
humlet | 0:13c962fecb13 | 136 | |
humlet | 3:967dde37e712 | 137 | int I2CDriver::sendNwait() |
humlet | 0:13c962fecb13 | 138 | { |
humlet | 3:967dde37e712 | 139 | m_channel->transfer.freq = m_freq; |
humlet | 1:90455d5bdd8c | 140 | m_channel->transfer.caller = Thread::gettid(); |
humlet | 1:90455d5bdd8c | 141 | osSignalSet( m_channel->driver, DRV_USR_SIG); |
humlet | 0:13c962fecb13 | 142 | osSignalWait(DRV_USR_SIG,osWaitForever); |
humlet | 1:90455d5bdd8c | 143 | int ret = m_channel->transfer.ret; |
humlet | 1:90455d5bdd8c | 144 | unlock(); |
humlet | 1:90455d5bdd8c | 145 | return ret; |
humlet | 0:13c962fecb13 | 146 | } |
humlet | 0:13c962fecb13 | 147 | |
humlet | 3:967dde37e712 | 148 | int I2CDriver::readMaster(int address, char *data, int length, bool repeated) |
humlet | 1:90455d5bdd8c | 149 | { |
humlet | 1:90455d5bdd8c | 150 | lock(); |
humlet | 3:967dde37e712 | 151 | m_channel->transfer.cmd = READ_MST; |
humlet | 3:967dde37e712 | 152 | m_channel->transfer.slv = false; |
humlet | 1:90455d5bdd8c | 153 | m_channel->transfer.adr = address; |
humlet | 1:90455d5bdd8c | 154 | m_channel->transfer.dta = data; |
humlet | 1:90455d5bdd8c | 155 | m_channel->transfer.len = length; |
humlet | 1:90455d5bdd8c | 156 | m_channel->transfer.rep = repeated; |
humlet | 3:967dde37e712 | 157 | return sendNwait(); |
humlet | 1:90455d5bdd8c | 158 | } |
humlet | 1:90455d5bdd8c | 159 | |
humlet | 3:967dde37e712 | 160 | int I2CDriver::readMaster(int address, uint8_t _register, char *data, int length, bool repeated) |
humlet | 3:967dde37e712 | 161 | { |
humlet | 3:967dde37e712 | 162 | lock(); |
humlet | 3:967dde37e712 | 163 | m_channel->transfer.cmd = READ_MST_REG; |
humlet | 3:967dde37e712 | 164 | m_channel->transfer.slv = false; |
humlet | 3:967dde37e712 | 165 | m_channel->transfer.adr = address; |
humlet | 3:967dde37e712 | 166 | m_channel->transfer.reg = _register; |
humlet | 3:967dde37e712 | 167 | m_channel->transfer.dta = data; |
humlet | 3:967dde37e712 | 168 | m_channel->transfer.len = length; |
humlet | 3:967dde37e712 | 169 | m_channel->transfer.rep = repeated; |
humlet | 3:967dde37e712 | 170 | return sendNwait(); |
humlet | 3:967dde37e712 | 171 | } |
humlet | 3:967dde37e712 | 172 | |
humlet | 3:967dde37e712 | 173 | int I2CDriver::readMaster(int ack) |
humlet | 1:90455d5bdd8c | 174 | { |
humlet | 1:90455d5bdd8c | 175 | lock(); |
humlet | 1:90455d5bdd8c | 176 | m_channel->transfer.cmd = READ_BYTE; |
humlet | 3:967dde37e712 | 177 | m_channel->transfer.slv = false; |
humlet | 1:90455d5bdd8c | 178 | m_channel->transfer.ack = ack; |
humlet | 3:967dde37e712 | 179 | return sendNwait(); |
humlet | 1:90455d5bdd8c | 180 | } |
humlet | 1:90455d5bdd8c | 181 | |
humlet | 3:967dde37e712 | 182 | int I2CDriver::writeMaster(int address, const char *data, int length, bool repeated) |
humlet | 1:90455d5bdd8c | 183 | { |
humlet | 0:13c962fecb13 | 184 | lock(); |
humlet | 3:967dde37e712 | 185 | m_channel->transfer.cmd = WRITE_MST; |
humlet | 3:967dde37e712 | 186 | m_channel->transfer.slv = false; |
humlet | 1:90455d5bdd8c | 187 | m_channel->transfer.adr = address; |
humlet | 1:90455d5bdd8c | 188 | m_channel->transfer.wdta = data; |
humlet | 1:90455d5bdd8c | 189 | m_channel->transfer.len = length; |
humlet | 1:90455d5bdd8c | 190 | m_channel->transfer.rep = repeated; |
humlet | 3:967dde37e712 | 191 | return sendNwait(); |
humlet | 1:90455d5bdd8c | 192 | } |
humlet | 1:90455d5bdd8c | 193 | |
humlet | 3:967dde37e712 | 194 | int I2CDriver::writeMaster(int data) |
humlet | 1:90455d5bdd8c | 195 | { |
humlet | 1:90455d5bdd8c | 196 | lock(); |
humlet | 1:90455d5bdd8c | 197 | m_channel->transfer.cmd = WRITE_BYTE; |
humlet | 3:967dde37e712 | 198 | m_channel->transfer.slv = false; |
humlet | 1:90455d5bdd8c | 199 | m_channel->transfer.ack = data; |
humlet | 3:967dde37e712 | 200 | return sendNwait(); |
humlet | 0:13c962fecb13 | 201 | } |
humlet | 1:90455d5bdd8c | 202 | |
humlet | 3:967dde37e712 | 203 | void I2CDriver::startMaster(void) |
humlet | 1:90455d5bdd8c | 204 | { |
humlet | 1:90455d5bdd8c | 205 | lock(); |
humlet | 1:90455d5bdd8c | 206 | m_channel->transfer.cmd = START; |
humlet | 3:967dde37e712 | 207 | m_channel->transfer.slv = false; |
humlet | 1:90455d5bdd8c | 208 | sendNwait(); |
humlet | 3:967dde37e712 | 209 | } |
humlet | 3:967dde37e712 | 210 | |
humlet | 3:967dde37e712 | 211 | void I2CDriver::stopMaster(void) |
humlet | 3:967dde37e712 | 212 | { |
humlet | 3:967dde37e712 | 213 | lock(); |
humlet | 3:967dde37e712 | 214 | m_channel->transfer.cmd = STOP; |
humlet | 3:967dde37e712 | 215 | m_channel->transfer.slv = false; |
humlet | 3:967dde37e712 | 216 | sendNwait(); |
humlet | 3:967dde37e712 | 217 | } |
humlet | 3:967dde37e712 | 218 | |
humlet | 3:967dde37e712 | 219 | void I2CDriver::stopSlave(void) |
humlet | 3:967dde37e712 | 220 | { |
humlet | 3:967dde37e712 | 221 | lock(); |
humlet | 3:967dde37e712 | 222 | m_channel->transfer.cmd = STOP; |
humlet | 3:967dde37e712 | 223 | m_channel->transfer.slv = true; |
humlet | 3:967dde37e712 | 224 | m_channel->transfer.adr = m_slaveAdr; |
humlet | 3:967dde37e712 | 225 | sendNwait(); |
humlet | 3:967dde37e712 | 226 | } |
humlet | 3:967dde37e712 | 227 | |
humlet | 3:967dde37e712 | 228 | int I2CDriver::receiveSlave(uint32_t timeout_ms) |
humlet | 3:967dde37e712 | 229 | { |
humlet | 3:967dde37e712 | 230 | lock(); |
humlet | 3:967dde37e712 | 231 | m_channel->transfer.cmd = RECEIVE; |
humlet | 3:967dde37e712 | 232 | m_channel->transfer.slv = true; |
humlet | 3:967dde37e712 | 233 | m_channel->transfer.adr = m_slaveAdr; |
humlet | 3:967dde37e712 | 234 | m_channel->transfer.tmout = timeout_ms; |
humlet | 3:967dde37e712 | 235 | return sendNwait(); |
humlet | 3:967dde37e712 | 236 | } |
humlet | 3:967dde37e712 | 237 | |
humlet | 3:967dde37e712 | 238 | int I2CDriver::readSlave(char* data, int length) |
humlet | 3:967dde37e712 | 239 | { |
humlet | 3:967dde37e712 | 240 | lock(); |
humlet | 3:967dde37e712 | 241 | m_channel->transfer.cmd = READ_SLV; |
humlet | 3:967dde37e712 | 242 | m_channel->transfer.slv = true; |
humlet | 3:967dde37e712 | 243 | m_channel->transfer.adr = m_slaveAdr; |
humlet | 3:967dde37e712 | 244 | m_channel->transfer.dta = data; |
humlet | 3:967dde37e712 | 245 | m_channel->transfer.len = length; |
humlet | 3:967dde37e712 | 246 | return sendNwait(); |
humlet | 3:967dde37e712 | 247 | } |
humlet | 3:967dde37e712 | 248 | |
humlet | 3:967dde37e712 | 249 | int I2CDriver::readSlave(void) |
humlet | 3:967dde37e712 | 250 | { |
humlet | 3:967dde37e712 | 251 | lock(); |
humlet | 3:967dde37e712 | 252 | m_channel->transfer.cmd = READ_BYTE; |
humlet | 3:967dde37e712 | 253 | m_channel->transfer.slv = true; |
humlet | 3:967dde37e712 | 254 | m_channel->transfer.adr = m_slaveAdr; |
humlet | 3:967dde37e712 | 255 | m_channel->transfer.ack = 1; |
humlet | 3:967dde37e712 | 256 | return sendNwait(); |
humlet | 3:967dde37e712 | 257 | } |
humlet | 3:967dde37e712 | 258 | |
humlet | 3:967dde37e712 | 259 | int I2CDriver::writeSlave(const char *data, int length) |
humlet | 3:967dde37e712 | 260 | { |
humlet | 3:967dde37e712 | 261 | lock(); |
humlet | 3:967dde37e712 | 262 | m_channel->transfer.cmd = WRITE_SLV; |
humlet | 3:967dde37e712 | 263 | m_channel->transfer.slv = true; |
humlet | 3:967dde37e712 | 264 | m_channel->transfer.adr = m_slaveAdr; |
humlet | 3:967dde37e712 | 265 | m_channel->transfer.wdta = data; |
humlet | 3:967dde37e712 | 266 | m_channel->transfer.len = length; |
humlet | 3:967dde37e712 | 267 | return sendNwait(); |
humlet | 3:967dde37e712 | 268 | } |
humlet | 3:967dde37e712 | 269 | |
humlet | 3:967dde37e712 | 270 | int I2CDriver::writeSlave(int data) |
humlet | 3:967dde37e712 | 271 | { |
humlet | 3:967dde37e712 | 272 | lock(); |
humlet | 3:967dde37e712 | 273 | m_channel->transfer.cmd = WRITE_BYTE; |
humlet | 3:967dde37e712 | 274 | m_channel->transfer.slv = true; |
humlet | 3:967dde37e712 | 275 | m_channel->transfer.adr = m_slaveAdr; |
humlet | 3:967dde37e712 | 276 | m_channel->transfer.ack = data; |
humlet | 3:967dde37e712 | 277 | return sendNwait(); |
humlet | 1:90455d5bdd8c | 278 | } |
humlet | 1:90455d5bdd8c | 279 | |
humlet | 1:90455d5bdd8c | 280 | |
humlet | 3:967dde37e712 | 281 | |
humlet | 3:967dde37e712 | 282 |