Daniel Ferszt / MAX30100

no comment

Dependents:   MAX30100_FirstTry MAX30100_V04

Fork of MAX30100 by TESIS SATUROMETRICA

MAX30100.cpp@1:e96604eb8062, 2017-03-28 (annotated)

Committer:
Ferszt
Date:
Tue Mar 28 23:16:21 2017 +0000
Revision:
1:e96604eb8062
Parent:
0:c8da8e2afe09 
no change;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Ferszt 0:c8da8e2afe09 1 /*
Ferszt 0:c8da8e2afe09 2 Library for the Maxim MAX30100 pulse oximetry system
Ferszt 0:c8da8e2afe09 3 Connor Huffine/Kontakt
Ferszt 0:c8da8e2afe09 4 February 2016
Ferszt 0:c8da8e2afe09 5 */
Ferszt 0:c8da8e2afe09 6
Ferszt 0:c8da8e2afe09 7 #include "mbed.h"
Ferszt 0:c8da8e2afe09 8 #include "MAX30100.h"
Ferszt 0:c8da8e2afe09 9 #include "I2C_Driver.h"
Ferszt 0:c8da8e2afe09 10 #include "wire.h"
Ferszt 0:c8da8e2afe09 11
Ferszt 0:c8da8e2afe09 12 //TwoWire wire1 = TwoWire(NRF_TWI0);
Ferszt 0:c8da8e2afe09 13
Ferszt 0:c8da8e2afe09 14 MAX30100::MAX30100(){
Ferszt 0:c8da8e2afe09 15
Ferszt 0:c8da8e2afe09 16 }
Ferszt 0:c8da8e2afe09 17
Ferszt 0:c8da8e2afe09 18 void MAX30100::setLEDs(pulseWidth pw, ledCurrent red, ledCurrent ir){
Ferszt 0:c8da8e2afe09 19 uint8_t reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG);
Ferszt 0:c8da8e2afe09 20 reg = reg & 0xFC; // Set LED_PW to 00
Ferszt 0:c8da8e2afe09 21 I2CwriteByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, reg | pw); // Mask LED_PW
Ferszt 0:c8da8e2afe09 22 I2CwriteByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG, (red<<4) | ir); // write LED configs
Ferszt 0:c8da8e2afe09 23 }
Ferszt 0:c8da8e2afe09 24
Ferszt 0:c8da8e2afe09 25 void MAX30100::setSPO2(sampleRate sr){
Ferszt 0:c8da8e2afe09 26 uint8_t reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG);
Ferszt 0:c8da8e2afe09 27 reg = reg & 0xE3; // Set SPO2_SR to 000
Ferszt 0:c8da8e2afe09 28 I2CwriteByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, reg | (sr<<2)); // Mask SPO2_SR
Ferszt 0:c8da8e2afe09 29 reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG);
Ferszt 0:c8da8e2afe09 30 reg = reg & 0xf8; // Set Mode to 000
Ferszt 0:c8da8e2afe09 31 I2CwriteByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, reg | 0x03); // Mask MODE
Ferszt 0:c8da8e2afe09 32 }
Ferszt 0:c8da8e2afe09 33
Ferszt 0:c8da8e2afe09 34 int MAX30100::getNumSamp(void){
Ferszt 0:c8da8e2afe09 35 uint8_t wrPtr = I2CreadByte(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR);
Ferszt 0:c8da8e2afe09 36 uint8_t rdPtr = I2CreadByte(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR);
Ferszt 0:c8da8e2afe09 37 return (abs( 16 + wrPtr - rdPtr ) % 16);
Ferszt 0:c8da8e2afe09 38 }
Ferszt 0:c8da8e2afe09 39
Ferszt 0:c8da8e2afe09 40 void MAX30100::readSensor(void){
Ferszt 0:c8da8e2afe09 41 uint8_t temp[4] = {0}; // Temporary buffer for read values
Ferszt 0:c8da8e2afe09 42 I2CreadBytes(MAX30100_ADDRESS, MAX30100_FIFO_DATA, &temp[0], 4); // Read four times from the FIFO
Ferszt 0:c8da8e2afe09 43 IR = (temp[0]<<8) | temp[1]; // Combine values to get the actual number
Ferszt 0:c8da8e2afe09 44 RED = (temp[2]<<8) | temp[3]; // Combine values to get the actual number
Ferszt 0:c8da8e2afe09 45 }
Ferszt 0:c8da8e2afe09 46
Ferszt 0:c8da8e2afe09 47 void MAX30100::shutdown(void){
Ferszt 0:c8da8e2afe09 48 uint8_t reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG); // Get the current register
Ferszt 0:c8da8e2afe09 49 I2CwriteByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, reg | 0x80); // mask the SHDN bit
Ferszt 0:c8da8e2afe09 50 }
Ferszt 0:c8da8e2afe09 51
Ferszt 0:c8da8e2afe09 52 void MAX30100::reset(void){
Ferszt 0:c8da8e2afe09 53 uint8_t reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG); // Get the current register
Ferszt 0:c8da8e2afe09 54 I2CwriteByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, reg | 0x40); // mask the RESET bit
Ferszt 0:c8da8e2afe09 55 }
Ferszt 0:c8da8e2afe09 56
Ferszt 0:c8da8e2afe09 57 void MAX30100::startup(void){
Ferszt 0:c8da8e2afe09 58 uint8_t reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG); // Get the current register
Ferszt 0:c8da8e2afe09 59 I2CwriteByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, reg & 0x7F); // mask the SHDN bit
Ferszt 0:c8da8e2afe09 60 }
Ferszt 0:c8da8e2afe09 61
Ferszt 0:c8da8e2afe09 62 int MAX30100::getRevID(void){
Ferszt 0:c8da8e2afe09 63 return I2CreadByte(MAX30100_ADDRESS, MAX30100_REV_ID);
Ferszt 0:c8da8e2afe09 64 }
Ferszt 0:c8da8e2afe09 65
Ferszt 0:c8da8e2afe09 66 int MAX30100::getPartID(void){
Ferszt 0:c8da8e2afe09 67 return I2CreadByte(MAX30100_ADDRESS, MAX30100_PART_ID);
Ferszt 0:c8da8e2afe09 68 }
Ferszt 0:c8da8e2afe09 69
Ferszt 0:c8da8e2afe09 70 void MAX30100::begin(pulseWidth pw, ledCurrent ir, sampleRate sr){
Ferszt 1:e96604eb8062 71 I2CwriteByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, 0x03); // Heart rate only
Ferszt 1:e96604eb8062 72 I2CwriteByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG, 0XFF);
Ferszt 1:e96604eb8062 73 I2CwriteByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG, ir<<4|0x0f);
Ferszt 1:e96604eb8062 74 I2CwriteByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, (sr<<2)|pw);
Ferszt 1:e96604eb8062 75 //I2CwriteByte(MAX30100_ADDRESS, MAX30100_INT_ENABLE, 0xF0);
Ferszt 0:c8da8e2afe09 76 }
Ferszt 0:c8da8e2afe09 77
Ferszt 0:c8da8e2afe09 78 //void MAX30100::printRegisters(void){
Ferszt 0:c8da8e2afe09 79 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_INT_STATUS), BIN);
Ferszt 0:c8da8e2afe09 80 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_INT_ENABLE), BIN);
Ferszt 0:c8da8e2afe09 81 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR), BIN);
Ferszt 0:c8da8e2afe09 82 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_OVRFLOW_CTR), BIN);
Ferszt 0:c8da8e2afe09 83 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR), BIN);
Ferszt 0:c8da8e2afe09 84 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_FIFO_DATA), BIN);
Ferszt 0:c8da8e2afe09 85 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG), BIN);
Ferszt 0:c8da8e2afe09 86 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG), BIN);
Ferszt 0:c8da8e2afe09 87 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG), BIN);
Ferszt 0:c8da8e2afe09 88 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_TEMP_INTG), BIN);
Ferszt 0:c8da8e2afe09 89 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_TEMP_FRAC), BIN);
Ferszt 0:c8da8e2afe09 90 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_REV_ID), BIN);
Ferszt 0:c8da8e2afe09 91 // Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_PART_ID), BIN);
Ferszt 0:c8da8e2afe09 92 //}
Ferszt 0:c8da8e2afe09 93
Ferszt 0:c8da8e2afe09 94 // Wire.h read and write protocols
Ferszt 0:c8da8e2afe09 95 void MAX30100::I2CwriteByte(uint8_t address, uint8_t subAddress, uint8_t data)
Ferszt 0:c8da8e2afe09 96 {
Ferszt 0:c8da8e2afe09 97 //wire1.beginTransmission(address); // Initialize the Tx buffer
Ferszt 0:c8da8e2afe09 98 //wire1.write(subAddress); // Put slave register address in Tx buffer
Ferszt 0:c8da8e2afe09 99 //wire1.write(data); // Put data in Tx buffer
Ferszt 0:c8da8e2afe09 100 //wire1.endTransmission(); // Send the Tx buffer
Ferszt 0:c8da8e2afe09 101 write_i2c(subAddress, &data, 1, 0xAE);
Ferszt 0:c8da8e2afe09 102 }
Ferszt 0:c8da8e2afe09 103
Ferszt 0:c8da8e2afe09 104 uint8_t MAX30100::I2CreadByte(uint8_t address, uint8_t subAddress)
Ferszt 0:c8da8e2afe09 105 {
Ferszt 0:c8da8e2afe09 106 uint8_t data; // `data` will store the register data
Ferszt 0:c8da8e2afe09 107 //wire.beginTransmission(address); // Initialize the Tx buffer
Ferszt 0:c8da8e2afe09 108 //wire.write(subAddress); // Put slave register address in Tx buffer
Ferszt 0:c8da8e2afe09 109 //wire.endTransmission(false); // Send the Tx buffer, but send a restart to keep connection alive
Ferszt 0:c8da8e2afe09 110 //wire.requestFrom(address, (uint8_t) 1); // Read one byte from slave register address
Ferszt 0:c8da8e2afe09 111 //data = Wire.read(); // Fill Rx buffer with result
Ferszt 0:c8da8e2afe09 112 read_i2c(subAddress, &data, 1, 0xAE);
Ferszt 0:c8da8e2afe09 113 return data; // Return data read from slave register
Ferszt 0:c8da8e2afe09 114 }
Ferszt 0:c8da8e2afe09 115
Ferszt 0:c8da8e2afe09 116 void MAX30100::I2CreadBytes(uint8_t address, uint8_t subAddress, uint8_t * dest, uint8_t count)
Ferszt 0:c8da8e2afe09 117 {
Ferszt 0:c8da8e2afe09 118 //Wire.beginTransmission(address); // Initialize the Tx buffer
Ferszt 0:c8da8e2afe09 119 // Next send the register to be read. OR with 0x80 to indicate multi-read.
Ferszt 0:c8da8e2afe09 120 //Wire.write(subAddress); // Put slave register address in Tx buffer
Ferszt 0:c8da8e2afe09 121 //Wire.endTransmission(false); // Send the Tx buffer, but send a restart to keep connection alive
Ferszt 0:c8da8e2afe09 122 //uint8_t i = 0;
Ferszt 0:c8da8e2afe09 123 //Wire.requestFrom(address, count); // Read bytes from slave register address
Ferszt 0:c8da8e2afe09 124 //while (Wire.available())
Ferszt 0:c8da8e2afe09 125 //{
Ferszt 0:c8da8e2afe09 126 // dest[i++] = Wire.read(); // Put read results in the Rx buffer
Ferszt 0:c8da8e2afe09 127 //}
Ferszt 0:c8da8e2afe09 128 read_i2c(subAddress, dest, count, 0xAE);
Ferszt 0:c8da8e2afe09 129 }