Diff: max30102.cpp

Revision:

1:02f411fefe6f

Parent:

0:e1e1947a9882

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max30102.cpp	Tue Jun 21 09:43:15 2016 +0000
@@ -0,0 +1,183 @@
+/*
+ * Library for the Maxim MAX30102 pulse oximetry system, I modified a copy of the MAX30100 library in May 2016
+ */
+
+#include "max30102.h"
+#include "functions.h"
+ 
+Serial pc(USBTX, USBRX);
+
+void MAX30102::setLEDs(pulseWidth pw, ledCurrent red, ledCurrent ir){
+    char data_read[1];
+    char data_write[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_SPO2_CONFIG, data_read, 1);
+    data_read[0] = data_read[0] & 0xFD;                                 // Set LED_PW to 01
+    data_write[0] = data_read[0] | pw;
+    i2c_write(MAX30102_ADDRESS, MAX30102_SPO2_CONFIG, data_write, 1);   // Mask LED_PW
+    data_write[0] = (red);
+    i2c_write(MAX30102_ADDRESS, MAX30102_LED_CONFIG_1, data_write, 1);  // write LED1 configs
+    data_write[0] = (ir);
+    i2c_write(MAX30102_ADDRESS, MAX30102_LED_CONFIG_2, data_write, 1);  // write LED2 configs
+}
+
+void MAX30102::setSPO2(sampleRate sr, high_resolution hi_res){
+    char data_read[1];
+    char data_write[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_SPO2_CONFIG, data_read, 1);
+    data_read[0] = data_read[0] & 0x85;                                 // Set ADC_rge to 00, SPO2_SR to 001 = sr100 and LEDpw to 01 = 118
+    data_write[0] = data_read[0] | (sr<<2) | (hi_res<<6);
+    i2c_write(MAX30102_ADDRESS, MAX30102_SPO2_CONFIG, data_write, 1);   // Mask SPO2_SR
+    i2c_read(MAX30102_ADDRESS, MAX30102_CONFIG, data_read, 1);
+    data_write[0] = data_read[0] & 0xF8; // Set Mode to 000
+    i2c_write(MAX30102_ADDRESS, MAX30102_CONFIG, data_write, 1);        // Mask MODE
+}
+
+void MAX30102::setInterruptSPO2(void){
+    char data_read[1];
+    char data_write[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_INT_ENABLE, data_read, 1);
+    data_write[0] = data_read[0] & 0x00;                                // Set Interrupt enable for SPO2 | 0x10   // New: disable prox! & ~0x10
+    i2c_write(MAX30102_ADDRESS, MAX30102_INT_ENABLE, data_write, 1);    // Mask ENB_SPO2_RDY
+} 
+
+int MAX30102::getNumSamp(void){
+    char data_read[1] = {0};
+//    i2c_write(MAX30102_ADDRESS, MAX30102_FIFO_W_POINTER, data_read, 1);
+//    i2c_write(MAX30102_ADDRESS, MAX30102_FIFO_R_POINTER, data_read, 1);
+//    wait(0.148);
+    i2c_read(MAX30102_ADDRESS, MAX30102_FIFO_W_POINTER, data_read, 1);
+    char wrPtr = data_read[0];
+    i2c_read(MAX30102_ADDRESS, MAX30102_FIFO_R_POINTER, data_read, 1);
+    char rdPtr = data_read[0];
+    return ((int)wrPtr - (int)rdPtr);                                   // New counting
+ //   return (abs( 16 + (int)wrPtr - (int)rdPtr ) % 16);
+}
+
+void MAX30102::setTemp(void){
+    char data_read[1];
+    char data_write[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_TEMP_CONFIG, data_read, 1);
+    data_write[0] = data_read[0] | 0x01;    // Enable temperature
+    i2c_write(MAX30102_ADDRESS, MAX30102_TEMP_CONFIG, data_write, 1);   // Mask MODE
+    i2c_read(MAX30102_ADDRESS, MAX30102_TEMP_CONFIG, data_read, 1);
+}
+
+void MAX30102::setSPO2mode(void){
+    char data_read[1];
+    char data_write[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_CONFIG, data_read, 1);
+    data_write[0] = data_read[0] | 0x03;    // Set SPO2 Mode
+    i2c_write(MAX30102_ADDRESS, MAX30102_CONFIG, data_write, 1);
+}
+
+int MAX30102::readTemp(void){
+    char data_read[1];
+    char temp_int, temp_fract;
+    int temp_measured;
+    i2c_read(MAX30102_ADDRESS, MAX30102_TEMP_INTEGER, data_read, 1);
+    temp_int = data_read[0];
+    i2c_read(MAX30102_ADDRESS, MAX30102_TEMP_FRACTION, data_read, 1);
+    temp_fract = data_read[0] & 0x0F;
+    temp_measured = ((int)temp_int)+(((int)temp_fract) >> 4);
+    return temp_measured;
+}
+
+void MAX30102::readSensor(void){
+    char data_read[6] = {0}; 
+    HR = 0;
+    SPO2 = 0;
+    i2c_read(MAX30102_ADDRESS, MAX30102_FIFO_DATA_REG, data_read, 6);   // Read six times from the FIFO
+    HR = (data_read[0]<<16) | (data_read[1]<<8) | data_read[2];         // Combine values to get the actual number
+    HR = HR>>2;
+    SPO2 = (data_read[3]<<16) | (data_read[4]<<8) | data_read[5];       // Combine values to get the actual number
+    SPO2 = SPO2>>2;
+}
+
+void MAX30102::shutdown(void){
+    char data_read[1];
+    char data_write[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_CONFIG, data_read, 1);          // Get the current register
+    data_write[0] = data_read[0] | 0x80;
+    i2c_write(MAX30102_ADDRESS, MAX30102_CONFIG, data_write, 1);        // mask the SHDN bit
+}
+
+void MAX30102::reset(void){
+    char data_read[1];
+    char data_write[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_CONFIG, data_read, 1);          // Get the current register
+    data_write[0] = data_read[0] | 0x40;
+    i2c_write(MAX30102_ADDRESS, MAX30102_CONFIG, data_write, 1);        // mask the RESET bit
+}
+
+void MAX30102::startup(void){
+    char data_read[1];
+    char data_write[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_CONFIG, data_read, 1);          // Get the current register
+    data_write[0] = data_read[0] & 0x7F;
+    i2c_write(MAX30102_ADDRESS, MAX30102_CONFIG, data_write, 1);        // mask the SHDN bit
+}
+
+char MAX30102::getRevID(void){
+    char data_read[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_REVISION_ID, data_read, 1);
+    return data_read[0];
+}
+
+char MAX30102::getPartID(void){
+    char data_read[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_PART_ID, data_read, 1);
+    return data_read[0];
+}
+
+void MAX30102::begin(pulseWidth pw, ledCurrent ir, sampleRate sr){
+    char data_write[1];
+    data_write[0] = 0x02;
+    i2c_write(MAX30102_ADDRESS, MAX30102_CONFIG, data_write, 1);        // Heart rate only
+    data_write[0] = ir;
+    i2c_write(MAX30102_ADDRESS, MAX30102_LED_CONFIG_1, data_write, 1);
+    data_write[0] = ((sr<<2)|pw);
+    i2c_write(MAX30102_ADDRESS, MAX30102_SPO2_CONFIG, data_write, 1);
+}
+
+void MAX30102::init(pulseWidth pw, sampleRate sr, high_resolution hi_res, ledCurrent red, ledCurrent ir){
+    char data_write[1];
+    
+    setLEDs(pw, red, ir);
+    setSPO2(sr, hi_res);
+    
+    data_write[0] = 0x10;
+    i2c_write(MAX30102_ADDRESS, MAX30102_FIFO_CONFIG, data_write, 1);
+      
+}
+
+void MAX30102::printRegisters(void){
+    char data_read[1];
+    i2c_read(MAX30102_ADDRESS, MAX30102_INT_STATUS, data_read, 1);
+    pc.printf("INT_STATUS: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_INT_ENABLE, data_read, 1);
+    pc.printf("INT_ENABLE: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_FIFO_W_POINTER, data_read, 1);
+    pc.printf("FIFO_W_POINTER: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_OVR_COUNTER, data_read, 1);
+    pc.printf("OVR_COUNTER: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_FIFO_R_POINTER, data_read, 1);
+    pc.printf("FIFO_R_POINTER: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_FIFO_DATA_REG, data_read, 1);
+    pc.printf("FIFO_DATA_REG: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_CONFIG, data_read, 1);
+    pc.printf("CONFIG: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_SPO2_CONFIG, data_read, 1);
+    pc.printf("SPO2_CONFIG: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_LED_CONFIG_2, data_read, 1);
+    pc.printf("LED_CONFIG: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_TEMP_INTEGER, data_read, 1);
+    pc.printf("TEMP_INTEGER: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_TEMP_FRACTION, data_read, 1);
+    pc.printf("TEMP_FRACTION: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_TEMP_CONFIG, data_read, 1);
+    pc.printf("TEMP_CONFIG: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_REVISION_ID, data_read, 1);
+    pc.printf("REVISION_ID: %#4X\r\n", data_read[0]);
+    i2c_read(MAX30102_ADDRESS, MAX30102_PART_ID, data_read, 1);
+    pc.printf("PART_ID: %#4X\r\n", data_read[0]);
+}