Gabrielle Martin-Fortier / Mbed 2 deprecated Tensiometer_Simulator_waterbench

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Dependencies:   mbed

I2CSlaveComm.cpp@0:265fff2cfb0a, 2018-10-30 (annotated)

Committer:
Blanglois
Date:
Tue Oct 30 15:52:54 2018 +0000
Revision:
0:265fff2cfb0a
Child:
1:85afd4bd4651
I2C Communication with ST

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Blanglois 0:265fff2cfb0a 1 #include "mbed.h"
Blanglois 0:265fff2cfb0a 2 #include "I2CSlaveComm.h"
Blanglois 0:265fff2cfb0a 3
Blanglois 0:265fff2cfb0a 4 I2CSlaveCustom slave(D14, D15);
Blanglois 0:265fff2cfb0a 5 I2CSlaveCustom slave2(D2, D8); //use another I2C to emulate the adc
Blanglois 0:265fff2cfb0a 6
Blanglois 0:265fff2cfb0a 7 unsigned char PointOnAddress = 0;
Blanglois 0:265fff2cfb0a 8 unsigned short ReadADCValue = 0;
Blanglois 0:265fff2cfb0a 9 #pragma pack(push,1)
Blanglois 0:265fff2cfb0a 10 struct SmartSensorStruct {
Blanglois 0:265fff2cfb0a 11 char crc; ///< Checksum CRC8
Blanglois 0:265fff2cfb0a 12 char serial[11]; ///< No Série du capteur. Doit demeurer à l'offset 1 dans la structure
Blanglois 0:265fff2cfb0a 13 char gain; ///< Gain à appliquer
Blanglois 0:265fff2cfb0a 14 char sampling_rate; ///< Vitesse de sampling
Blanglois 0:265fff2cfb0a 15 char model; ///< Model de capteur
Blanglois 0:265fff2cfb0a 16 short c1; ///< Consigne c1 de calcul
Blanglois 0:265fff2cfb0a 17 short c2; ///< Consigne c2 de calcul
Blanglois 0:265fff2cfb0a 18 short c3; ///< Consigne c3 de calcul
Blanglois 0:265fff2cfb0a 19 char depth; ///< Profondeur du capteur en mètres ou en pieds
Blanglois 0:265fff2cfb0a 20 short c4; ///< Consigne c4 de calcul
Blanglois 0:265fff2cfb0a 21 unsigned long code;///< Code de détection du type de smartSensor (Salinité ou Tension)
Blanglois 0:265fff2cfb0a 22 }SmartSensorStruct_packed;
Blanglois 0:265fff2cfb0a 23 #pragma pack(pop)
Blanglois 0:265fff2cfb0a 24
Blanglois 0:265fff2cfb0a 25 struct SmartSensorStruct stSensor;
Blanglois 0:265fff2cfb0a 26
Blanglois 0:265fff2cfb0a 27 char RAMBuffer[256]; //simulate EEPROM
Blanglois 0:265fff2cfb0a 28
Blanglois 0:265fff2cfb0a 29 void DoCRC8(char* a_crc8, char b)
Blanglois 0:265fff2cfb0a 30 {
Blanglois 0:265fff2cfb0a 31 char i, j;
Blanglois 0:265fff2cfb0a 32
Blanglois 0:265fff2cfb0a 33 for (i = 0; i < 8; b >>= 1, i++) {
Blanglois 0:265fff2cfb0a 34
Blanglois 0:265fff2cfb0a 35 j = (b ^ (*a_crc8)) & 1;
Blanglois 0:265fff2cfb0a 36 (*a_crc8) >>= 1;
Blanglois 0:265fff2cfb0a 37
Blanglois 0:265fff2cfb0a 38 if (j) (*a_crc8) ^= 0x8C;
Blanglois 0:265fff2cfb0a 39 }
Blanglois 0:265fff2cfb0a 40 }
Blanglois 0:265fff2cfb0a 41
Blanglois 0:265fff2cfb0a 42 void setADC(unsigned short value)
Blanglois 0:265fff2cfb0a 43 {
Blanglois 0:265fff2cfb0a 44 ReadADCValue = value;
Blanglois 0:265fff2cfb0a 45 }
Blanglois 0:265fff2cfb0a 46
Blanglois 0:265fff2cfb0a 47 char ComputeCRC8(char *buff, char len, char start_data)
Blanglois 0:265fff2cfb0a 48 {
Blanglois 0:265fff2cfb0a 49 char crc8 = 0;
Blanglois 0:265fff2cfb0a 50 DoCRC8(&crc8, start_data);
Blanglois 0:265fff2cfb0a 51 while (len--) DoCRC8(&crc8, *buff++);
Blanglois 0:265fff2cfb0a 52
Blanglois 0:265fff2cfb0a 53 return crc8;
Blanglois 0:265fff2cfb0a 54 }
Blanglois 0:265fff2cfb0a 55
Blanglois 0:265fff2cfb0a 56
Blanglois 0:265fff2cfb0a 57 void SaveRamBuffer(char address, char* value, unsigned char length)
Blanglois 0:265fff2cfb0a 58 {
Blanglois 0:265fff2cfb0a 59
Blanglois 0:265fff2cfb0a 60 unsigned char i;
Blanglois 0:265fff2cfb0a 61 for(i = 0; i < length; i++)
Blanglois 0:265fff2cfb0a 62 RAMBuffer[address + i] = value[i];
Blanglois 0:265fff2cfb0a 63 }
Blanglois 0:265fff2cfb0a 64
Blanglois 0:265fff2cfb0a 65 void SaveData(char add, long value)
Blanglois 0:265fff2cfb0a 66 {
Blanglois 0:265fff2cfb0a 67 SaveRamBuffer(add, (char*)&value, 4);
Blanglois 0:265fff2cfb0a 68 }
Blanglois 0:265fff2cfb0a 69
Blanglois 0:265fff2cfb0a 70 void I2C_1Process()
Blanglois 0:265fff2cfb0a 71 {
Blanglois 0:265fff2cfb0a 72 char buf[MAX_WRITE_SIZE + 1];
Blanglois 0:265fff2cfb0a 73 int nbRx = 0;
Blanglois 0:265fff2cfb0a 74
Blanglois 0:265fff2cfb0a 75 for(int i = 0; i < MAX_WRITE_SIZE; i++) buf[i] = 0; // Clear buffer
Blanglois 0:265fff2cfb0a 76
Blanglois 0:265fff2cfb0a 77 int rx = slave.receive();
Blanglois 0:265fff2cfb0a 78
Blanglois 0:265fff2cfb0a 79 switch (rx)
Blanglois 0:265fff2cfb0a 80 {
Blanglois 0:265fff2cfb0a 81 case I2CSlave::ReadAddressed:
Blanglois 0:265fff2cfb0a 82 printf("%02x\n", RAMBuffer[PointOnAddress]);
Blanglois 0:265fff2cfb0a 83 slave.write(&RAMBuffer[PointOnAddress], 0xF0 - PointOnAddress);
Blanglois 0:265fff2cfb0a 84 printf("ReadAddressed 1\n");
Blanglois 0:265fff2cfb0a 85 break;
Blanglois 0:265fff2cfb0a 86 /*case I2CSlave::WriteGeneral:
Blanglois 0:265fff2cfb0a 87
Blanglois 0:265fff2cfb0a 88
Blanglois 0:265fff2cfb0a 89 break;*/
Blanglois 0:265fff2cfb0a 90 case I2CSlave::WriteAddressed:
Blanglois 0:265fff2cfb0a 91 slave.read(buf, MAX_WRITE_SIZE + 1);
Blanglois 0:265fff2cfb0a 92 PointOnAddress = buf[0];
Blanglois 0:265fff2cfb0a 93 nbRx = slave.getCount();
Blanglois 0:265fff2cfb0a 94 //PcUart.printf("nb rx %d\r\n", nbRx);
Blanglois 0:265fff2cfb0a 95 if (nbRx > 0)
Blanglois 0:265fff2cfb0a 96 SaveRamBuffer(PointOnAddress, &buf[1], nbRx);
Blanglois 0:265fff2cfb0a 97 printf("WriteAddressed 1\n");
Blanglois 0:265fff2cfb0a 98 break;
Blanglois 0:265fff2cfb0a 99 }
Blanglois 0:265fff2cfb0a 100 }
Blanglois 0:265fff2cfb0a 101
Blanglois 0:265fff2cfb0a 102 void I2C_2Process()
Blanglois 0:265fff2cfb0a 103 {
Blanglois 0:265fff2cfb0a 104 int rx = slave2.receive();
Blanglois 0:265fff2cfb0a 105 switch (rx)
Blanglois 0:265fff2cfb0a 106 {
Blanglois 0:265fff2cfb0a 107 case I2CSlave::ReadAddressed:
Blanglois 0:265fff2cfb0a 108 slave2.write((char*)&ReadADCValue, 2);
Blanglois 0:265fff2cfb0a 109 printf("ReadAddressed 2 end\n");
Blanglois 0:265fff2cfb0a 110 break;
Blanglois 0:265fff2cfb0a 111 /*case I2CSlave::WriteGeneral:
Blanglois 0:265fff2cfb0a 112
Blanglois 0:265fff2cfb0a 113
Blanglois 0:265fff2cfb0a 114 break;*/
Blanglois 0:265fff2cfb0a 115 /*case I2CSlave::WriteAddressed:
Blanglois 0:265fff2cfb0a 116 //do nothing
Blanglois 0:265fff2cfb0a 117 break;*/
Blanglois 0:265fff2cfb0a 118 }
Blanglois 0:265fff2cfb0a 119 }
Blanglois 0:265fff2cfb0a 120
Blanglois 0:265fff2cfb0a 121 void I2CSlaveProcess()
Blanglois 0:265fff2cfb0a 122 {
Blanglois 0:265fff2cfb0a 123 I2C_1Process();
Blanglois 0:265fff2cfb0a 124 I2C_2Process();
Blanglois 0:265fff2cfb0a 125 }
Blanglois 0:265fff2cfb0a 126
Blanglois 0:265fff2cfb0a 127 void InitI2CSlaveComm()
Blanglois 0:265fff2cfb0a 128 {
Blanglois 0:265fff2cfb0a 129 slave.address(0xA0);
Blanglois 0:265fff2cfb0a 130 sprintf(stSensor.serial, "2059123456");
Blanglois 0:265fff2cfb0a 131 stSensor.gain = 0x01;
Blanglois 0:265fff2cfb0a 132 stSensor.sampling_rate = 0x03;
Blanglois 0:265fff2cfb0a 133 stSensor.c1 = -37;
Blanglois 0:265fff2cfb0a 134 stSensor.c2 = 634;
Blanglois 0:265fff2cfb0a 135 stSensor.c3 = -7;
Blanglois 0:265fff2cfb0a 136 stSensor.c4 = -1;
Blanglois 0:265fff2cfb0a 137 stSensor.depth = 0x00;
Blanglois 0:265fff2cfb0a 138 stSensor.model = 2; //Nombre de données à transmettre vers le ST
Blanglois 0:265fff2cfb0a 139 stSensor.code = 0xFFFF; //Type of sensor
Blanglois 0:265fff2cfb0a 140 stSensor.crc = ComputeCRC8(((char *)&stSensor)+1, sizeof(SmartSensorStruct_packed) - 7, 0);
Blanglois 0:265fff2cfb0a 141 SaveRamBuffer(0, (char*)&stSensor, sizeof(SmartSensorStruct_packed));
Blanglois 0:265fff2cfb0a 142
Blanglois 0:265fff2cfb0a 143
Blanglois 0:265fff2cfb0a 144 slave2.address(0x90);
Blanglois 0:265fff2cfb0a 145 }