max30100.cpp

00001 #include "max30100.h"
00002 
00003 //Set up I2C, (SDA,SCL)
00004 static I2C i2c(I2C_SDA, I2C_SCL);
00005 static Serial pc(USBTX, USBRX); // tx, rx
00006 
00007 uint16_t IR = 0;      // Last IR reflectance datapoint
00008 uint16_t RED = 0;     // Last Red reflectance datapoint
00009 
00010 //Wire read and write protocols
00011 int max30100::i2c_write (uint8_t i2c_addr, uint8_t register_addr, char* buffer, uint8_t Nbyte )
00012 {
00013     int ret;
00014     char *tmp_buffer;
00015 
00016     tmp_buffer = (char*)malloc(sizeof(char)*(Nbyte+1));
00017 
00018     /* First, send device address. Then, send data and STOP condition */
00019     tmp_buffer[0] = register_addr;
00020     memcpy(tmp_buffer+1, buffer, Nbyte);
00021 
00022     ret = i2c.write(i2c_addr, tmp_buffer, Nbyte+1, false);
00023 
00024     return ret;
00025 }
00026 
00027 int max30100::i2c_read (uint8_t i2c_addr, uint8_t register_addr, char* buffer, uint8_t Nbyte )
00028 {
00029     int ret;
00030 
00031     /* Send device address, with no STOP condition */
00032     ret = i2c.write(i2c_addr, (const char*)&register_addr, 1, true);
00033     if(!ret) {
00034         /* Read data, with STOP condition  */
00035         ret = i2c.read((i2c_addr|0x01), buffer, Nbyte, false);
00036     }
00037 
00038     return ret;
00039 }
00040 //
00041    
00042 void max30100::setLEDs(pulseWidth pw, ledCurrent red, ledCurrent ir){
00043   char reg[1];
00044   i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);
00045   reg[0] = reg[0] & 0xFC; // Set LED_PW to 00
00046   reg[0] = reg[0] | pw;
00047   i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);     // Mask LED_PW
00048   reg[0] = (red<<4) | ir;
00049   i2c_write(MAX30100_ADDRESS, MAX30100_LED_CONFIG, &reg[0], 1); // write LED configs
00050 }
00051 
00052 void max30100::setSPO2(sampleRate sr){
00053   char reg[1];
00054   i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);
00055   reg[0] = reg[0] & 0xE3; // Set SPO2_SR to 000
00056   reg[0] = reg[0] | (sr<<2);
00057   i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1); // Mask SPO2_SR
00058   i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);
00059   reg[0] = reg[0] & 0xf8; // Set Mode to 000
00060   reg[0] = reg[0] | 0x03;
00061   i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1); // Mask MODE
00062 }
00063 
00064 int max30100::getNumSamp(void){
00065     char wrPtr[1];
00066     char rdPtr[1];
00067     i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR, &wrPtr[0], 1);
00068     i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR, &rdPtr[0], 1);
00069     return (abs( 16 + wrPtr[0] - rdPtr[0] ) % 16);
00070 }
00071 
00072 void max30100::readSensor(void){
00073   char temp[4] = {0};  // Temporary buffer for read values
00074   i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_DATA, &temp[0], 4);  // Read four times from the FIFO
00075   IR = (temp[0]<<8) | temp[1];    // Combine values to get the actual number
00076   RED = (temp[2]<<8) | temp[3];   // Combine values to get the actual number
00077 }
00078 
00079 void max30100::shutdown(void){
00080   char reg[1];
00081   i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);  // Get the current register
00082   reg[0] = reg[0] | 0x80;
00083   i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);   // mask the SHDN bit
00084 }
00085 
00086 void max30100::reset(void){
00087   char reg[1];
00088   i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);  // Get the current register
00089   reg[0] = reg[0] | 0x40;
00090   i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);   // mask the RESET bit
00091 }
00092 
00093 void max30100::startup(void){
00094   char reg[1];
00095   i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);  // Get the current register
00096   reg[0] = reg[0] & 0x7F;
00097   i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);   // mask the SHDN bit
00098 }
00099 
00100 uint8_t max30100::getRevID(void){
00101   char buffer[1];
00102   i2c_read(MAX30100_ADDRESS, MAX30100_REV_ID, &buffer[0], 1);
00103   return buffer[0];
00104 }
00105 
00106 uint8_t max30100::getPartID(void){
00107   char buffer[1];
00108   i2c_read(MAX30100_ADDRESS, MAX30100_PART_ID, &buffer[0], 1);
00109   return buffer[0];
00110 }
00111 
00112 void max30100::begin(pulseWidth pw, ledCurrent ir, sampleRate sr){
00113   char buffer[1];
00114   buffer[0] = 0x02;
00115   i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &buffer[0], 1); // Heart rate only
00116   buffer[0] = ir;
00117   i2c_write(MAX30100_ADDRESS, MAX30100_LED_CONFIG, &buffer[0], 1);
00118   buffer[0] = (sr<<2)|pw;
00119   i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &buffer[0], 1);
00120 }
00121 
00122 void max30100::printRegisters(void){
00123     char reg[1];
00124     i2c_read(MAX30100_ADDRESS, MAX30100_INT_STATUS, &reg[0], 1);
00125     pc.printf("MAX30100_INT_STATUS: %d\r\n",reg[0]);
00126     i2c_read(MAX30100_ADDRESS, MAX30100_INT_ENABLE, &reg[0], 1);
00127     pc.printf("MAX30100_INT_ENABLE: %d\r\n",reg[0]);
00128     i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR, &reg[0], 1);
00129     pc.printf("MAX30100_FIFO_WR_PTR: %d\r\n",reg[0]);
00130     i2c_read(MAX30100_ADDRESS, MAX30100_OVRFLOW_CTR, &reg[0], 1);
00131     pc.printf("MAX30100_OVRFLOW_CTR: %d\r\n",reg[0]);
00132     i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR, &reg[0], 1);
00133     pc.printf("MAX30100_FIFO_RD_PTR: %d\r\n",reg[0]);
00134     i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_DATA, &reg[0], 1);
00135     pc.printf("MAX30100_FIFO_DATA: %d\r\n",reg[0]);
00136     i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, &reg[0], 1);
00137     pc.printf("MAX30100_MODE_CONFIG: %d\r\n",reg[0]);
00138     i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, &reg[0], 1);
00139     pc.printf("MAX30100_SPO2_CONFIG: %d\r\n",reg[0]);
00140     i2c_read(MAX30100_ADDRESS, MAX30100_LED_CONFIG, &reg[0], 1);
00141     pc.printf("MAX30100_LED_CONFIG: %d\r\n",reg[0]);
00142     i2c_read(MAX30100_ADDRESS, MAX30100_TEMP_INTG, &reg[0], 1);
00143     pc.printf("MAX30100_TEMP_INTG: %d\r\n",reg[0]);
00144     i2c_read(MAX30100_ADDRESS, MAX30100_TEMP_FRAC, &reg[0], 1);
00145     pc.printf("MAX30100_TEMP_FRAC: %d\r\n",reg[0]);
00146     i2c_read(MAX30100_ADDRESS, MAX30100_REV_ID, &reg[0], 1);
00147     pc.printf("MAX30100_REV_ID: %d\r\n",reg[0]);
00148     i2c_read(MAX30100_ADDRESS, MAX30100_PART_ID, &reg[0], 1);
00149     pc.printf("MAX30100_PART_ID: %d\r\n",reg[0]);
00150 }