Revision 0:0307ce7b7033, committed 2017-11-21

Comitter:

kohlerba

Date:

Tue Nov 21 20:34:45 2017 +0000

Commit message:

MAX30100 sensor

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max30100.cpp	Tue Nov 21 20:34:45 2017 +0000
@@ -0,0 +1,150 @@
+#include "max30100.h"
+
+//Set up I2C, (SDA,SCL)
+static I2C i2c(I2C_SDA, I2C_SCL);
+static Serial pc(USBTX, USBRX); // tx, rx
+
+uint16_t IR = 0;      // Last IR reflectance datapoint
+uint16_t RED = 0;     // Last Red reflectance datapoint
+
+//Wire read and write protocols
+int max30100::i2c_write (uint8_t i2c_addr, uint8_t register_addr, char* buffer, uint8_t Nbyte )
+{
+    int ret;
+    char *tmp_buffer;
+
+    tmp_buffer = (char*)malloc(sizeof(char)*(Nbyte+1));
+
+    /* First, send device address. Then, send data and STOP condition */
+    tmp_buffer[0] = register_addr;
+    memcpy(tmp_buffer+1, buffer, Nbyte);
+
+    ret = i2c.write(i2c_addr, tmp_buffer, Nbyte+1, false);
+
+    return ret;
+}
+
+int max30100::i2c_read (uint8_t i2c_addr, uint8_t register_addr, char* buffer, uint8_t Nbyte )
+{
+    int ret;
+
+    /* Send device address, with no STOP condition */
+    ret = i2c.write(i2c_addr, (const char*)&register_addr, 1, true);
+    if(!ret) {
+        /* Read data, with STOP condition  */
+        ret = i2c.read((i2c_addr|0x01), buffer, Nbyte, false);
+    }
+
+    return ret;
+}
+//
+   
+void max30100::setLEDs(pulseWidth pw, ledCurrent red, ledCurrent ir){
+  char reg[1];
+  i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);
+  reg[0] = reg[0] & 0xFC; // Set LED_PW to 00
+  reg[0] = reg[0] | pw;
+  i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);     // Mask LED_PW
+  reg[0] = (red<<4) | ir;
+  i2c_write(MAX30100_ADDRESS, MAX30100_LED_CONFIG, &reg[0], 1); // write LED configs
+}
+
+void max30100::setSPO2(sampleRate sr){
+  char reg[1];
+  i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);
+  reg[0] = reg[0] & 0xE3; // Set SPO2_SR to 000
+  reg[0] = reg[0] | (sr<<2);
+  i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1); // Mask SPO2_SR
+  i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);
+  reg[0] = reg[0] & 0xf8; // Set Mode to 000
+  reg[0] = reg[0] | 0x03;
+  i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1); // Mask MODE
+}
+
+int max30100::getNumSamp(void){
+    char wrPtr[1];
+    char rdPtr[1];
+    i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR, &wrPtr[0], 1);
+    i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR, &rdPtr[0], 1);
+    return (abs( 16 + wrPtr[0] - rdPtr[0] ) % 16);
+}
+
+void max30100::readSensor(void){
+  char temp[4] = {0};  // Temporary buffer for read values
+  i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_DATA, &temp[0], 4);  // 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 max30100::shutdown(void){
+  char reg[1];
+  i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);  // Get the current register
+  reg[0] = reg[0] | 0x80;
+  i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);   // mask the SHDN bit
+}
+
+void max30100::reset(void){
+  char reg[1];
+  i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);  // Get the current register
+  reg[0] = reg[0] | 0x40;
+  i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);   // mask the RESET bit
+}
+
+void max30100::startup(void){
+  char reg[1];
+  i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);  // Get the current register
+  reg[0] = reg[0] & 0x7F;
+  i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);   // mask the SHDN bit
+}
+
+uint8_t max30100::getRevID(void){
+  char buffer[1];
+  i2c_read(MAX30100_ADDRESS, MAX30100_REV_ID, &buffer[0], 1);
+  return buffer[0];
+}
+
+uint8_t max30100::getPartID(void){
+  char buffer[1];
+  i2c_read(MAX30100_ADDRESS, MAX30100_PART_ID, &buffer[0], 1);
+  return buffer[0];
+}
+
+void max30100::begin(pulseWidth pw, ledCurrent ir, sampleRate sr){
+  char buffer[1];
+  buffer[0] = 0x02;
+  i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &buffer[0], 1); // Heart rate only
+  buffer[0] = ir;
+  i2c_write(MAX30100_ADDRESS, MAX30100_LED_CONFIG, &buffer[0], 1);
+  buffer[0] = (sr<<2)|pw;
+  i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &buffer[0], 1);
+}
+
+void max30100::printRegisters(void){
+    char reg[1];
+    i2c_read(MAX30100_ADDRESS, MAX30100_INT_STATUS, &reg[0], 1);
+    pc.printf("MAX30100_INT_STATUS: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_INT_ENABLE, &reg[0], 1);
+    pc.printf("MAX30100_INT_ENABLE: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR, &reg[0], 1);
+    pc.printf("MAX30100_FIFO_WR_PTR: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_OVRFLOW_CTR, &reg[0], 1);
+    pc.printf("MAX30100_OVRFLOW_CTR: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR, &reg[0], 1);
+    pc.printf("MAX30100_FIFO_RD_PTR: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_DATA, &reg[0], 1);
+    pc.printf("MAX30100_FIFO_DATA: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);
+    pc.printf("MAX30100_MODE_CONFIG: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);
+    pc.printf("MAX30100_SPO2_CONFIG: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_LED_CONFIG, &reg[0], 1);
+    pc.printf("MAX30100_LED_CONFIG: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_TEMP_INTG, &reg[0], 1);
+    pc.printf("MAX30100_TEMP_INTG: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_TEMP_FRAC, &reg[0], 1);
+    pc.printf("MAX30100_TEMP_FRAC: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_REV_ID, &reg[0], 1);
+    pc.printf("MAX30100_REV_ID: %d\r\n",reg[0]);
+    i2c_read(MAX30100_ADDRESS, MAX30100_PART_ID, &reg[0], 1);
+    pc.printf("MAX30100_PART_ID: %d\r\n",reg[0]);
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max30100.h	Tue Nov 21 20:34:45 2017 +0000
@@ -0,0 +1,66 @@
+#ifndef MAX30100_H
+#define MAX30100_H
+
+#include "max30100_reg.h"
+#include "mbed.h"
+
+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;
+
+class max30100 {
+ 
+    protected:
+ 
+    public:
+
+    //
+    int i2c_write (uint8_t i2c_addr, uint8_t register_addr, char* buffer, uint8_t Nbyte );
+    int i2c_read (uint8_t i2c_addr, uint8_t register_addr, char* buffer, uint8_t Nbyte );
+    //
+   
+    void setLEDs(pulseWidth pw, ledCurrent red, ledCurrent ir);
+    void setSPO2(sampleRate sr);
+    int getNumSamp(void);
+    void readSensor(void);
+    void shutdown(void);
+    void reset(void);
+    void startup(void);
+    uint8_t getRevID(void);
+    uint8_t getPartID(void);
+    void begin(pulseWidth pw, ledCurrent ir, sampleRate sr);
+    void printRegisters(void);
+};
+#endif
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max30100_reg.h	Tue Nov 21 20:34:45 2017 +0000
@@ -0,0 +1,24 @@
+#ifndef MAX30100_REG_H
+#define MAX30100_REG_H
+
+//definitions
+#define MAX30100_ADDRESS 0xAE
+
+// 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
+
+#define POR_PART_ID             0x11
+
+#endif
\ No newline at end of file