Diff: MAX30100.h

Revision:

0:faf977308bdc

Child:

1:0c2135629097

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX30100.h	Fri Aug 18 01:06:07 2017 +0000
@@ -0,0 +1,176 @@
+#ifndef MAX30100_H
+#define MAX30100_H
+
+#include "mbed.h"
+
+//definitions
+#define MAX30100_ADDRESS 0x57
+
+// Registers
+#define MAX30100_INT_STATUS     0x00  // Which interrupts are tripped
+#define MAX30100_INT_ENABLE     0x01  // Which interrupts are active
+#define MAX30100_FIFO_WR_PTR    0x02  // Where data is being written
+#define MAX30100_OVRFLOW_CTR    0x03  // Number of lost samples
+#define MAX30100_FIFO_RD_PTR    0x04  // Where to read from
+#define MAX30100_FIFO_DATA      0x05  // Ouput data buffer
+#define MAX30100_MODE_CONFIG    0x06  // Control register
+#define MAX30100_SPO2_CONFIG    0x07  // Oximetry settings
+#define MAX30100_LED_CONFIG     0x09  // Pulse width and power of LEDs
+#define MAX30100_TEMP_INTG      0x16  // Temperature value, whole number
+#define MAX30100_TEMP_FRAC      0x17  // Temperature value, fraction
+#define MAX30100_REV_ID         0xFE  // Part revision
+#define MAX30100_PART_ID        0xFF  // Part ID, normally 0x11
+
+typedef enum{ // This is the same for both LEDs
+  pw200,    // 200us pulse
+  pw400,    // 400us pulse
+  pw800,    // 800us pulse
+  pw1600    // 1600us pulse
+}pulseWidth;
+
+typedef enum{
+  sr50,    // 50 samples per second
+  sr100,   // 100 samples per second
+  sr167,   // 167 samples per second
+  sr200,   // 200 samples per second
+  sr400,   // 400 samples per second
+  sr600,   // 600 samples per second
+  sr800,   // 800 samples per second
+  sr1000   // 1000 samples per second
+}sampleRate;
+
+typedef enum{
+  i0,    // No current
+  i4,    // 4.4mA
+  i8,    // 7.6mA
+  i11,   // 11.0mA
+  i14,   // 14.2mA
+  i17,   // 17.4mA
+  i21,   // 20.8mA
+  i27,   // 27.1mA
+  i31,   // 30.6mA
+  i34,   // 33.8mA
+  i37,   // 37.0mA
+  i40,   // 40.2mA
+  i44,   // 43.6mA
+  i47,   // 46.8mA
+  i50    // 50.0mA
+}ledCurrent;
+
+//Set up I2C, (SDA,SCL)
+I2C i2c(I2C_SDA, I2C_SCL);
+
+uint16_t IR = 0;      // Last IR reflectance datapoint
+uint16_t RED = 0;     // Last Red reflectance datapoint
+
+class MAX30100 {
+ 
+    protected:
+ 
+    public:
+    
+    void writeByte(uint8_t address, uint8_t subAddress, uint8_t data)
+{
+   char data_write[2];
+   data_write[0] = subAddress;
+   data_write[1] = data;
+   i2c.write(address, data_write, 2, 0);
+}
+
+    char readByte(uint8_t address, uint8_t subAddress)
+{
+    char data[1]; // `data` will store the register data     
+    char data_write[1];
+    data_write[0] = subAddress;
+    i2c.write(address, data_write, 1, 1); // no stop
+    i2c.read(address, data, 1, 0); 
+    return data[0]; 
+}
+
+    void readBytes(uint8_t address, uint8_t subAddress, uint8_t count, uint8_t * dest)
+{     
+    char data[14];
+    char data_write[1];
+    data_write[0] = subAddress;
+    i2c.write(address, data_write, 1, 1); // no stop
+    i2c.read(address, data, count, 0); 
+    for(int ii = 0; ii < count; ii++) {
+     dest[ii] = data[ii];
+    }
+}
+
+void setLEDs(pulseWidth pw, ledCurrent red, ledCurrent ir){
+  uint8_t reg = readByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG);
+  reg = reg & 0xFC; // Set LED_PW to 00
+  writeByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, reg | pw);     // Mask LED_PW
+  writeByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG, (red<<4) | ir); // write LED configs
+}
+
+void setSPO2(sampleRate sr){
+  uint8_t reg = readByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG);
+  reg = reg & 0xE3; // Set SPO2_SR to 000
+  writeByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, reg | (sr<<2)); // Mask SPO2_SR
+  reg = readByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG);
+  reg = reg & 0xf8; // Set Mode to 000
+  writeByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, reg | 0x03); // Mask MODE
+}
+
+int getNumSamp(void){
+    uint8_t wrPtr = readByte(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR);
+    uint8_t rdPtr = readByte(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR);
+    return (abs( 16 + wrPtr - rdPtr ) % 16);
+}
+
+void readSensor(void){
+  uint8_t temp[4] = {0};  // Temporary buffer for read values
+  readBytes(MAX30100_ADDRESS, MAX30100_FIFO_DATA, 4, &temp[0]);  // Read four times from the FIFO
+  IR = (temp[0]<<8) | temp[1];    // Combine values to get the actual number
+  RED = (temp[2]<<8) | temp[3];   // Combine values to get the actual number
+}
+
+void shutdown(void){
+  uint8_t reg = readByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG);  // Get the current register
+  writeByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, reg | 0x80);   // mask the SHDN bit
+}
+
+void reset(void){
+  uint8_t reg = readByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG);  // Get the current register
+  writeByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, reg | 0x40);   // mask the RESET bit
+}
+
+void startup(void){
+  uint8_t reg = readByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG);  // Get the current register
+  writeByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, reg & 0x7F);   // mask the SHDN bit
+}
+
+int getRevID(void){
+  return readByte(MAX30100_ADDRESS, MAX30100_REV_ID);
+}
+
+int getPartID(void){
+  return readByte(MAX30100_ADDRESS, MAX30100_PART_ID);
+}
+
+void begin(pulseWidth pw, ledCurrent ir, sampleRate sr){
+  writeByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, 0x02); // Heart rate only
+  writeByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG, ir);
+  writeByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, (sr<<2)|pw);
+}
+
+void printRegisters(void){
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_INT_STATUS),  BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_INT_ENABLE),  BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR), BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_OVRFLOW_CTR), BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR), BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_FIFO_DATA),   BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG), BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG), BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG),  BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_TEMP_INTG),   BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_TEMP_FRAC),   BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_REV_ID),      BIN);
+  Serial.println(readByte(MAX30100_ADDRESS, MAX30100_PART_ID),     BIN);
+}
+
+#endif
\ No newline at end of file