Bradley Kohler / MAX30100

MAX30100 pulse and oximeter sensor library

Ported from Arduino library

max30100.cpp@0:0307ce7b7033, 2017-11-21 (annotated)

Committer:
kohlerba
Date:
Tue Nov 21 20:34:45 2017 +0000
Revision:
0:0307ce7b7033
MAX30100 sensor

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kohlerba 0:0307ce7b7033 1 #include "max30100.h"
kohlerba 0:0307ce7b7033 2
kohlerba 0:0307ce7b7033 3 //Set up I2C, (SDA,SCL)
kohlerba 0:0307ce7b7033 4 static I2C i2c(I2C_SDA, I2C_SCL);
kohlerba 0:0307ce7b7033 5 static Serial pc(USBTX, USBRX); // tx, rx
kohlerba 0:0307ce7b7033 6
kohlerba 0:0307ce7b7033 7 uint16_t IR = 0; // Last IR reflectance datapoint
kohlerba 0:0307ce7b7033 8 uint16_t RED = 0; // Last Red reflectance datapoint
kohlerba 0:0307ce7b7033 9
kohlerba 0:0307ce7b7033 10 //Wire read and write protocols
kohlerba 0:0307ce7b7033 11 int max30100::i2c_write (uint8_t i2c_addr, uint8_t register_addr, char* buffer, uint8_t Nbyte )
kohlerba 0:0307ce7b7033 12 {
kohlerba 0:0307ce7b7033 13 int ret;
kohlerba 0:0307ce7b7033 14 char *tmp_buffer;
kohlerba 0:0307ce7b7033 15
kohlerba 0:0307ce7b7033 16 tmp_buffer = (char*)malloc(sizeof(char)*(Nbyte+1));
kohlerba 0:0307ce7b7033 17
kohlerba 0:0307ce7b7033 18 /* First, send device address. Then, send data and STOP condition */
kohlerba 0:0307ce7b7033 19 tmp_buffer[0] = register_addr;
kohlerba 0:0307ce7b7033 20 memcpy(tmp_buffer+1, buffer, Nbyte);
kohlerba 0:0307ce7b7033 21
kohlerba 0:0307ce7b7033 22 ret = i2c.write(i2c_addr, tmp_buffer, Nbyte+1, false);
kohlerba 0:0307ce7b7033 23
kohlerba 0:0307ce7b7033 24 return ret;
kohlerba 0:0307ce7b7033 25 }
kohlerba 0:0307ce7b7033 26
kohlerba 0:0307ce7b7033 27 int max30100::i2c_read (uint8_t i2c_addr, uint8_t register_addr, char* buffer, uint8_t Nbyte )
kohlerba 0:0307ce7b7033 28 {
kohlerba 0:0307ce7b7033 29 int ret;
kohlerba 0:0307ce7b7033 30
kohlerba 0:0307ce7b7033 31 /* Send device address, with no STOP condition */
kohlerba 0:0307ce7b7033 32 ret = i2c.write(i2c_addr, (const char*)&register_addr, 1, true);
kohlerba 0:0307ce7b7033 33 if(!ret) {
kohlerba 0:0307ce7b7033 34 /* Read data, with STOP condition */
kohlerba 0:0307ce7b7033 35 ret = i2c.read((i2c_addr|0x01), buffer, Nbyte, false);
kohlerba 0:0307ce7b7033 36 }
kohlerba 0:0307ce7b7033 37
kohlerba 0:0307ce7b7033 38 return ret;
kohlerba 0:0307ce7b7033 39 }
kohlerba 0:0307ce7b7033 40 //
kohlerba 0:0307ce7b7033 41
kohlerba 0:0307ce7b7033 42 void max30100::setLEDs(pulseWidth pw, ledCurrent red, ledCurrent ir){
kohlerba 0:0307ce7b7033 43 char reg[1];
kohlerba 0:0307ce7b7033 44 i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);
kohlerba 0:0307ce7b7033 45 reg[0] = reg[0] & 0xFC; // Set LED_PW to 00
kohlerba 0:0307ce7b7033 46 reg[0] = reg[0] | pw;
kohlerba 0:0307ce7b7033 47 i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1); // Mask LED_PW
kohlerba 0:0307ce7b7033 48 reg[0] = (red<<4) | ir;
kohlerba 0:0307ce7b7033 49 i2c_write(MAX30100_ADDRESS, MAX30100_LED_CONFIG, &reg[0], 1); // write LED configs
kohlerba 0:0307ce7b7033 50 }
kohlerba 0:0307ce7b7033 51
kohlerba 0:0307ce7b7033 52 void max30100::setSPO2(sampleRate sr){
kohlerba 0:0307ce7b7033 53 char reg[1];
kohlerba 0:0307ce7b7033 54 i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);
kohlerba 0:0307ce7b7033 55 reg[0] = reg[0] & 0xE3; // Set SPO2_SR to 000
kohlerba 0:0307ce7b7033 56 reg[0] = reg[0] | (sr<<2);
kohlerba 0:0307ce7b7033 57 i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1); // Mask SPO2_SR
kohlerba 0:0307ce7b7033 58 i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);
kohlerba 0:0307ce7b7033 59 reg[0] = reg[0] & 0xf8; // Set Mode to 000
kohlerba 0:0307ce7b7033 60 reg[0] = reg[0] | 0x03;
kohlerba 0:0307ce7b7033 61 i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1); // Mask MODE
kohlerba 0:0307ce7b7033 62 }
kohlerba 0:0307ce7b7033 63
kohlerba 0:0307ce7b7033 64 int max30100::getNumSamp(void){
kohlerba 0:0307ce7b7033 65 char wrPtr[1];
kohlerba 0:0307ce7b7033 66 char rdPtr[1];
kohlerba 0:0307ce7b7033 67 i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR, &wrPtr[0], 1);
kohlerba 0:0307ce7b7033 68 i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR, &rdPtr[0], 1);
kohlerba 0:0307ce7b7033 69 return (abs( 16 + wrPtr[0] - rdPtr[0] ) % 16);
kohlerba 0:0307ce7b7033 70 }
kohlerba 0:0307ce7b7033 71
kohlerba 0:0307ce7b7033 72 void max30100::readSensor(void){
kohlerba 0:0307ce7b7033 73 char temp[4] = {0}; // Temporary buffer for read values
kohlerba 0:0307ce7b7033 74 i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_DATA, &temp[0], 4); // Read four times from the FIFO
kohlerba 0:0307ce7b7033 75 IR = (temp[0]<<8) | temp[1]; // Combine values to get the actual number
kohlerba 0:0307ce7b7033 76 RED = (temp[2]<<8) | temp[3]; // Combine values to get the actual number
kohlerba 0:0307ce7b7033 77 }
kohlerba 0:0307ce7b7033 78
kohlerba 0:0307ce7b7033 79 void max30100::shutdown(void){
kohlerba 0:0307ce7b7033 80 char reg[1];
kohlerba 0:0307ce7b7033 81 i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1); // Get the current register
kohlerba 0:0307ce7b7033 82 reg[0] = reg[0] | 0x80;
kohlerba 0:0307ce7b7033 83 i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1); // mask the SHDN bit
kohlerba 0:0307ce7b7033 84 }
kohlerba 0:0307ce7b7033 85
kohlerba 0:0307ce7b7033 86 void max30100::reset(void){
kohlerba 0:0307ce7b7033 87 char reg[1];
kohlerba 0:0307ce7b7033 88 i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1); // Get the current register
kohlerba 0:0307ce7b7033 89 reg[0] = reg[0] | 0x40;
kohlerba 0:0307ce7b7033 90 i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1); // mask the RESET bit
kohlerba 0:0307ce7b7033 91 }
kohlerba 0:0307ce7b7033 92
kohlerba 0:0307ce7b7033 93 void max30100::startup(void){
kohlerba 0:0307ce7b7033 94 char reg[1];
kohlerba 0:0307ce7b7033 95 i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1); // Get the current register
kohlerba 0:0307ce7b7033 96 reg[0] = reg[0] & 0x7F;
kohlerba 0:0307ce7b7033 97 i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1); // mask the SHDN bit
kohlerba 0:0307ce7b7033 98 }
kohlerba 0:0307ce7b7033 99
kohlerba 0:0307ce7b7033 100 uint8_t max30100::getRevID(void){
kohlerba 0:0307ce7b7033 101 char buffer[1];
kohlerba 0:0307ce7b7033 102 i2c_read(MAX30100_ADDRESS, MAX30100_REV_ID, &buffer[0], 1);
kohlerba 0:0307ce7b7033 103 return buffer[0];
kohlerba 0:0307ce7b7033 104 }
kohlerba 0:0307ce7b7033 105
kohlerba 0:0307ce7b7033 106 uint8_t max30100::getPartID(void){
kohlerba 0:0307ce7b7033 107 char buffer[1];
kohlerba 0:0307ce7b7033 108 i2c_read(MAX30100_ADDRESS, MAX30100_PART_ID, &buffer[0], 1);
kohlerba 0:0307ce7b7033 109 return buffer[0];
kohlerba 0:0307ce7b7033 110 }
kohlerba 0:0307ce7b7033 111
kohlerba 0:0307ce7b7033 112 void max30100::begin(pulseWidth pw, ledCurrent ir, sampleRate sr){
kohlerba 0:0307ce7b7033 113 char buffer[1];
kohlerba 0:0307ce7b7033 114 buffer[0] = 0x02;
kohlerba 0:0307ce7b7033 115 i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &buffer[0], 1); // Heart rate only
kohlerba 0:0307ce7b7033 116 buffer[0] = ir;
kohlerba 0:0307ce7b7033 117 i2c_write(MAX30100_ADDRESS, MAX30100_LED_CONFIG, &buffer[0], 1);
kohlerba 0:0307ce7b7033 118 buffer[0] = (sr<<2)|pw;
kohlerba 0:0307ce7b7033 119 i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &buffer[0], 1);
kohlerba 0:0307ce7b7033 120 }
kohlerba 0:0307ce7b7033 121
kohlerba 0:0307ce7b7033 122 void max30100::printRegisters(void){
kohlerba 0:0307ce7b7033 123 char reg[1];
kohlerba 0:0307ce7b7033 124 i2c_read(MAX30100_ADDRESS, MAX30100_INT_STATUS, &reg[0], 1);
kohlerba 0:0307ce7b7033 125 pc.printf("MAX30100_INT_STATUS: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 126 i2c_read(MAX30100_ADDRESS, MAX30100_INT_ENABLE, &reg[0], 1);
kohlerba 0:0307ce7b7033 127 pc.printf("MAX30100_INT_ENABLE: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 128 i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR, &reg[0], 1);
kohlerba 0:0307ce7b7033 129 pc.printf("MAX30100_FIFO_WR_PTR: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 130 i2c_read(MAX30100_ADDRESS, MAX30100_OVRFLOW_CTR, &reg[0], 1);
kohlerba 0:0307ce7b7033 131 pc.printf("MAX30100_OVRFLOW_CTR: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 132 i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR, &reg[0], 1);
kohlerba 0:0307ce7b7033 133 pc.printf("MAX30100_FIFO_RD_PTR: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 134 i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_DATA, &reg[0], 1);
kohlerba 0:0307ce7b7033 135 pc.printf("MAX30100_FIFO_DATA: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 136 i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);
kohlerba 0:0307ce7b7033 137 pc.printf("MAX30100_MODE_CONFIG: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 138 i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);
kohlerba 0:0307ce7b7033 139 pc.printf("MAX30100_SPO2_CONFIG: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 140 i2c_read(MAX30100_ADDRESS, MAX30100_LED_CONFIG, &reg[0], 1);
kohlerba 0:0307ce7b7033 141 pc.printf("MAX30100_LED_CONFIG: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 142 i2c_read(MAX30100_ADDRESS, MAX30100_TEMP_INTG, &reg[0], 1);
kohlerba 0:0307ce7b7033 143 pc.printf("MAX30100_TEMP_INTG: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 144 i2c_read(MAX30100_ADDRESS, MAX30100_TEMP_FRAC, &reg[0], 1);
kohlerba 0:0307ce7b7033 145 pc.printf("MAX30100_TEMP_FRAC: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 146 i2c_read(MAX30100_ADDRESS, MAX30100_REV_ID, &reg[0], 1);
kohlerba 0:0307ce7b7033 147 pc.printf("MAX30100_REV_ID: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 148 i2c_read(MAX30100_ADDRESS, MAX30100_PART_ID, &reg[0], 1);
kohlerba 0:0307ce7b7033 149 pc.printf("MAX30100_PART_ID: %d\r\n",reg[0]);
kohlerba 0:0307ce7b7033 150 }