Elmaddin Guliyev / Mbed 2 deprecated ADS1299

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Dependencies:   mbed

ads1299.cpp@0:99e31762ab2f, 2019-05-29 (annotated)

Committer:
eguliyev
Date:
Wed May 29 03:43:46 2019 +0000
Revision:
0:99e31762ab2f
how to read texas instrument adc1299 using nucleo f4

Who changed what in which revision?

UserRevisionLine numberNew contents of line
eguliyev 0:99e31762ab2f 1 #include "mbed.h"
eguliyev 0:99e31762ab2f 2 #include "ads1299.h"
eguliyev 0:99e31762ab2f 3
eguliyev 0:99e31762ab2f 4 SPI spi(SPI_MOSI,SPI_MISO,SPI_SCK);
eguliyev 0:99e31762ab2f 5 DigitalOut CS(PA_4);
eguliyev 0:99e31762ab2f 6 InterruptIn DRDY(PA_2);
eguliyev 0:99e31762ab2f 7
eguliyev 0:99e31762ab2f 8 long ADS129X_data[9];
eguliyev 0:99e31762ab2f 9 bool ADS129X_newData;
eguliyev 0:99e31762ab2f 10 void ADS129X_dataReadyISR();
eguliyev 0:99e31762ab2f 11
eguliyev 0:99e31762ab2f 12 void SPI_INIT(void){
eguliyev 0:99e31762ab2f 13 spi.format(8,1);
eguliyev 0:99e31762ab2f 14 spi.frequency(1000000);
eguliyev 0:99e31762ab2f 15 }
eguliyev 0:99e31762ab2f 16
eguliyev 0:99e31762ab2f 17 void WAKEUP() {
eguliyev 0:99e31762ab2f 18 CS = 0;
eguliyev 0:99e31762ab2f 19 spi.write(ADS129X_CMD_WAKEUP);
eguliyev 0:99e31762ab2f 20 wait_us(2);
eguliyev 0:99e31762ab2f 21 CS = 1;
eguliyev 0:99e31762ab2f 22 wait_us(2);
eguliyev 0:99e31762ab2f 23 }
eguliyev 0:99e31762ab2f 24
eguliyev 0:99e31762ab2f 25 void STANDBY() {
eguliyev 0:99e31762ab2f 26 CS = 0;
eguliyev 0:99e31762ab2f 27 spi.write(ADS129X_CMD_STANDBY);
eguliyev 0:99e31762ab2f 28 wait_us(2);
eguliyev 0:99e31762ab2f 29 CS = 1;
eguliyev 0:99e31762ab2f 30 }
eguliyev 0:99e31762ab2f 31
eguliyev 0:99e31762ab2f 32 void RSET() {
eguliyev 0:99e31762ab2f 33 CS = 0;
eguliyev 0:99e31762ab2f 34 spi.write(ADS129X_CMD_RESET);
eguliyev 0:99e31762ab2f 35 wait_us(2);
eguliyev 0:99e31762ab2f 36 CS =1;
eguliyev 0:99e31762ab2f 37 wait_ms(10);
eguliyev 0:99e31762ab2f 38 }
eguliyev 0:99e31762ab2f 39
eguliyev 0:99e31762ab2f 40 void START() {
eguliyev 0:99e31762ab2f 41 // CS = 0;
eguliyev 0:99e31762ab2f 42 //spi.write(ADS129X_CMD_START);
eguliyev 0:99e31762ab2f 43 // wait_us(2);
eguliyev 0:99e31762ab2f 44 // CS = 1;
eguliyev 0:99e31762ab2f 45 RDATA();
eguliyev 0:99e31762ab2f 46 DRDY.fall(&ADS129X_dataReadyISR);
eguliyev 0:99e31762ab2f 47 }
eguliyev 0:99e31762ab2f 48
eguliyev 0:99e31762ab2f 49
eguliyev 0:99e31762ab2f 50 void RDATAC() {
eguliyev 0:99e31762ab2f 51 CS =0;;
eguliyev 0:99e31762ab2f 52 spi.write(ADS129X_CMD_RDATAC);
eguliyev 0:99e31762ab2f 53 wait_us(2);
eguliyev 0:99e31762ab2f 54 CS = 1;
eguliyev 0:99e31762ab2f 55 wait_us(2); //must way at least 4 tCLK cycles before sending another command (Datasheet, pg. 39)
eguliyev 0:99e31762ab2f 56 }
eguliyev 0:99e31762ab2f 57
eguliyev 0:99e31762ab2f 58 void SDATAC() {
eguliyev 0:99e31762ab2f 59 CS = 0;
eguliyev 0:99e31762ab2f 60 spi.write(ADS129X_CMD_SDATAC); //SDATAC
eguliyev 0:99e31762ab2f 61 wait_us(2);
eguliyev 0:99e31762ab2f 62 CS=1;
eguliyev 0:99e31762ab2f 63 }
eguliyev 0:99e31762ab2f 64
eguliyev 0:99e31762ab2f 65 void RDATA() {
eguliyev 0:99e31762ab2f 66 CS =0;
eguliyev 0:99e31762ab2f 67 spi.write(ADS129X_CMD_RDATA);
eguliyev 0:99e31762ab2f 68 wait_us(2);
eguliyev 0:99e31762ab2f 69 CS=1;
eguliyev 0:99e31762ab2f 70 }
eguliyev 0:99e31762ab2f 71
eguliyev 0:99e31762ab2f 72 char RREG(char _address) {
eguliyev 0:99e31762ab2f 73 char opcode1 = ADS129X_CMD_RREG | (_address & 0x1F); //001rrrrr; _RREG = 00100000 and _address = rrrrr
eguliyev 0:99e31762ab2f 74 CS = 0; //Low to communicate
eguliyev 0:99e31762ab2f 75 spi.write(opcode1); //RREG
eguliyev 0:99e31762ab2f 76 spi.write(0x00); //opcode2
eguliyev 0:99e31762ab2f 77 wait_us(1);
eguliyev 0:99e31762ab2f 78 char data = spi.write(0x00); // read (Datasheet, pg.39)
eguliyev 0:99e31762ab2f 79 wait_us(2);
eguliyev 0:99e31762ab2f 80 CS =1; //High to end communication
eguliyev 0:99e31762ab2f 81 return data;
eguliyev 0:99e31762ab2f 82 }
eguliyev 0:99e31762ab2f 83
eguliyev 0:99e31762ab2f 84 void RREG(char _address, char _numRegisters, char *_data) {
eguliyev 0:99e31762ab2f 85 char opcode1 = ADS129X_CMD_RREG | (_address & 0x1F); //001rrrrr; _RREG = 00100000 and _address = rrrrr
eguliyev 0:99e31762ab2f 86 CS = 0;
eguliyev 0:99e31762ab2f 87 spi.write(ADS129X_CMD_SDATAC); //SDATAC
eguliyev 0:99e31762ab2f 88 spi.write(opcode1); //RREG
eguliyev 0:99e31762ab2f 89 spi.write(_numRegisters-1); //opcode2
eguliyev 0:99e31762ab2f 90 for(char i = 0; i < _numRegisters; i++){
eguliyev 0:99e31762ab2f 91 *(_data+i) = spi.write(0x00);
eguliyev 0:99e31762ab2f 92 }
eguliyev 0:99e31762ab2f 93 wait_us(2);
eguliyev 0:99e31762ab2f 94 CS = 1;
eguliyev 0:99e31762ab2f 95 }
eguliyev 0:99e31762ab2f 96
eguliyev 0:99e31762ab2f 97 void WREG(char _address, char _value) {
eguliyev 0:99e31762ab2f 98 char opcode1 = ADS129X_CMD_WREG | (_address & 0x1F); //001rrrrr; _RREG = 00100000 and _address = rrrrr ds
eguliyev 0:99e31762ab2f 99 CS=0; //Low to communicate
eguliyev 0:99e31762ab2f 100 spi.write(opcode1);
eguliyev 0:99e31762ab2f 101 spi.write(0x00); // opcode2; only write one register
eguliyev 0:99e31762ab2f 102 spi.write(_value);
eguliyev 0:99e31762ab2f 103 wait_us(2);
eguliyev 0:99e31762ab2f 104 CS = 1; //Low to communicate
eguliyev 0:99e31762ab2f 105 }
eguliyev 0:99e31762ab2f 106
eguliyev 0:99e31762ab2f 107 char getDeviceId() {
eguliyev 0:99e31762ab2f 108 CS=0; //Low to communicate
eguliyev 0:99e31762ab2f 109 spi.write(ADS129X_CMD_RREG); //RREG
eguliyev 0:99e31762ab2f 110 spi.write(0x00);
eguliyev 0:99e31762ab2f 111 char data = spi.write(0x00); // byte to read (hopefully 0b???11110)
eguliyev 0:99e31762ab2f 112 wait_us(2);
eguliyev 0:99e31762ab2f 113 CS=1; //Low to communicate
eguliyev 0:99e31762ab2f 114 return data;
eguliyev 0:99e31762ab2f 115 }
eguliyev 0:99e31762ab2f 116
eguliyev 0:99e31762ab2f 117 void Set_IRQ(){
eguliyev 0:99e31762ab2f 118 // DRDY.fall(&ADS129X_dataReadyISR);
eguliyev 0:99e31762ab2f 119 }
eguliyev 0:99e31762ab2f 120
eguliyev 0:99e31762ab2f 121 void ADS129X_dataReadyISR() {
eguliyev 0:99e31762ab2f 122
eguliyev 0:99e31762ab2f 123 CS = 0;
eguliyev 0:99e31762ab2f 124
eguliyev 0:99e31762ab2f 125 // status
eguliyev 0:99e31762ab2f 126 ((char*) ADS129X_data)[0*4+3] = 0;
eguliyev 0:99e31762ab2f 127 ((char*) ADS129X_data)[0*4+2] = spi.write(0x00);
eguliyev 0:99e31762ab2f 128 ((char*) ADS129X_data)[0*4+1] = spi.write(0x00);
eguliyev 0:99e31762ab2f 129 ((char*) ADS129X_data)[0*4+0] = spi.write(0x00);
eguliyev 0:99e31762ab2f 130 // channel 1
eguliyev 0:99e31762ab2f 131 ((char*) ADS129X_data)[1*4+3] = 0;
eguliyev 0:99e31762ab2f 132 ((char*) ADS129X_data)[1*4+2] = spi.write(0x00);
eguliyev 0:99e31762ab2f 133 ((char*) ADS129X_data)[1*4+1] = spi.write(0x00);
eguliyev 0:99e31762ab2f 134 ((char*) ADS129X_data)[1*4+0] = spi.write(0x00);
eguliyev 0:99e31762ab2f 135 // channel 2
eguliyev 0:99e31762ab2f 136 ((char*) ADS129X_data)[2*4+3] = 0;
eguliyev 0:99e31762ab2f 137 ((char*) ADS129X_data)[2*4+2] = spi.write(0x00);
eguliyev 0:99e31762ab2f 138 ((char*) ADS129X_data)[2*4+1] = spi.write(0x00);
eguliyev 0:99e31762ab2f 139 ((char*) ADS129X_data)[2*4+0] = spi.write(0x00);
eguliyev 0:99e31762ab2f 140 // channel 3
eguliyev 0:99e31762ab2f 141 ((char*) ADS129X_data)[3*4+3] = 0;
eguliyev 0:99e31762ab2f 142 ((char*) ADS129X_data)[3*4+2] = spi.write(0x00);
eguliyev 0:99e31762ab2f 143 ((char*) ADS129X_data)[3*4+1] = spi.write(0x00);
eguliyev 0:99e31762ab2f 144 ((char*) ADS129X_data)[3*4+0] = spi.write(0x00);
eguliyev 0:99e31762ab2f 145 // channel 4
eguliyev 0:99e31762ab2f 146 ((char*) ADS129X_data)[4*4+3] = 0;
eguliyev 0:99e31762ab2f 147 ((char*) ADS129X_data)[4*4+2] = spi.write(0x00);
eguliyev 0:99e31762ab2f 148 ((char*) ADS129X_data)[4*4+1] = spi.write(0x00);
eguliyev 0:99e31762ab2f 149 ((char*) ADS129X_data)[4*4+0] = spi.write(0x00);
eguliyev 0:99e31762ab2f 150 // channel 5
eguliyev 0:99e31762ab2f 151 ((char*) ADS129X_data)[5*4+3] = 0;
eguliyev 0:99e31762ab2f 152 ((char*) ADS129X_data)[5*4+2] = spi.write(0x00);
eguliyev 0:99e31762ab2f 153 ((char*) ADS129X_data)[5*4+1] = spi.write(0x00);
eguliyev 0:99e31762ab2f 154 ((char*) ADS129X_data)[5*4+0] = spi.write(0x00);
eguliyev 0:99e31762ab2f 155 // channel 6
eguliyev 0:99e31762ab2f 156 ((char*) ADS129X_data)[6*4+3] = 0;
eguliyev 0:99e31762ab2f 157 ((char*) ADS129X_data)[6*4+2] = spi.write(0x00);
eguliyev 0:99e31762ab2f 158 ((char*) ADS129X_data)[6*4+1] = spi.write(0x00);
eguliyev 0:99e31762ab2f 159 ((char*) ADS129X_data)[6*4+0] = spi.write(0x00);
eguliyev 0:99e31762ab2f 160 // channel 7
eguliyev 0:99e31762ab2f 161 ((char*) ADS129X_data)[7*4+3] = 0;
eguliyev 0:99e31762ab2f 162 ((char*) ADS129X_data)[7*4+2] = spi.write(0x00);
eguliyev 0:99e31762ab2f 163 ((char*) ADS129X_data)[7*4+1] = spi.write(0x00);
eguliyev 0:99e31762ab2f 164 ((char*) ADS129X_data)[7*4+0] = spi.write(0x00);
eguliyev 0:99e31762ab2f 165 // channel 8
eguliyev 0:99e31762ab2f 166 ((char*) ADS129X_data)[8*4+3] = 0;
eguliyev 0:99e31762ab2f 167 ((char*) ADS129X_data)[8*4+2] = spi.write(0x00);
eguliyev 0:99e31762ab2f 168 ((char*) ADS129X_data)[8*4+1] = spi.write(0x00);
eguliyev 0:99e31762ab2f 169 ((char*) ADS129X_data)[8*4+0] = spi.write(0x00);
eguliyev 0:99e31762ab2f 170 CS = 1;
eguliyev 0:99e31762ab2f 171 ADS129X_newData = true;
eguliyev 0:99e31762ab2f 172 }
eguliyev 0:99e31762ab2f 173
eguliyev 0:99e31762ab2f 174 bool getData(long *buffer) {
eguliyev 0:99e31762ab2f 175 if(ADS129X_newData) {
eguliyev 0:99e31762ab2f 176 ADS129X_newData = false;
eguliyev 0:99e31762ab2f 177 for (int i = 0; i < 9; i++) {
eguliyev 0:99e31762ab2f 178 buffer[i] = ADS129X_data[i];
eguliyev 0:99e31762ab2f 179 }
eguliyev 0:99e31762ab2f 180 return true;
eguliyev 0:99e31762ab2f 181 }
eguliyev 0:99e31762ab2f 182 return false;
eguliyev 0:99e31762ab2f 183 }
eguliyev 0:99e31762ab2f 184
eguliyev 0:99e31762ab2f 185
eguliyev 0:99e31762ab2f 186
eguliyev 0:99e31762ab2f 187 void configChannel(char _channel, bool _powerDown, char _gain, char _mux) {
eguliyev 0:99e31762ab2f 188 char value = ((_powerDown & 1)<<7) | ((_gain & 7)<<4) | (_mux & 7);
eguliyev 0:99e31762ab2f 189 WREG(ADS129X_REG_CH1SET + (_channel-1), value);
eguliyev 0:99e31762ab2f 190 }
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