I2CDriverTest02.h

00001 // exchange messages betwen the LPC1768's two i2c ports using high level reead/write commands
00002 // changing master and slave mode on the fly
00003 
00004 #include "mbed.h"
00005 #include "rtos.h"
00006 #include "I2CMasterRtos.h"
00007 #include "I2CSlaveRtos.h"
00008 
00009 const int freq = 400000;
00010 const int adr = 42<<1;
00011 const int len=34;
00012 const char mstMsg[len]="We are mbed, resistance is futile";
00013 const char slvMsg[len]="Fine with me, let's get addicted ";
00014 
00015 static void slvRxMsg(I2CSlaveRtos& slv)
00016 {
00017     char rxMsg[len];
00018     memset(rxMsg,0,len);
00019     if ( slv.receive() == I2CSlave::WriteAddressed) {
00020         slv.read(rxMsg, len);
00021         printf("thread %X received message as i2c slave: '%s'\n",Thread::gettid(),rxMsg);
00022     } else
00023         printf("Ouch slv rx failure\n");
00024 }
00025 
00026 static void slvTxMsg(I2CSlaveRtos& slv)
00027 {
00028     if ( slv.receive() == I2CSlave::ReadAddressed) {
00029         slv.write(slvMsg, len);
00030     } else
00031         printf("Ouch slv tx failure\n");
00032 }
00033 
00034 static void mstTxMsg(I2CMasterRtos& mst)
00035 {
00036     mst.write(adr,mstMsg,len);
00037 }
00038 
00039 static void mstRxMsg(I2CMasterRtos& mst)
00040 {
00041     char rxMsg[len];
00042     memset(rxMsg,0,len);
00043     mst.read(adr,rxMsg,len);
00044     printf("thread %X received message as i2c master: '%s'\n",Thread::gettid(),rxMsg);
00045 }
00046 
00047 static void channel1(void const *args)
00048 {
00049     I2CMasterRtos mst(p9,p10,freq);
00050     I2CSlaveRtos slv(p9,p10,freq,adr);
00051     while(1) {
00052         slvRxMsg(slv);
00053         slvTxMsg(slv);
00054         Thread::wait(100);
00055         mstTxMsg(mst);
00056         Thread::wait(100);
00057         mstRxMsg(mst);
00058     }
00059 }
00060 
00061 void channel2(void const *args)
00062 {
00063     I2CMasterRtos mst(p28,p27,freq);
00064     I2CSlaveRtos slv(p28,p27,freq,adr);
00065     while(1) {
00066         Thread::wait(100);
00067         mstTxMsg(mst);
00068         Thread::wait(100);
00069         mstRxMsg(mst);
00070         slvRxMsg(slv);
00071         slvTxMsg(slv);
00072     }
00073 }
00074 
00075 int doit()
00076 {
00077     Thread selftalk01(channel1,0,osPriorityAboveNormal);
00078     Thread selftalk02(channel2,0,osPriorityAboveNormal);
00079 
00080     Thread::wait(10000);
00081 
00082     return 0;
00083 }
00084