Diff: MAX30100.cpp

Revision:

0:c8da8e2afe09

Child:

1:e96604eb8062

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX30100.cpp	Mon Mar 27 23:21:28 2017 +0000
@@ -0,0 +1,128 @@
+/*
+  Library for the Maxim MAX30100 pulse oximetry system
+  Connor Huffine/Kontakt
+  February 2016
+*/
+
+#include "mbed.h"
+#include "MAX30100.h"
+#include "I2C_Driver.h"
+#include "wire.h"
+
+//TwoWire wire1 = TwoWire(NRF_TWI0);
+
+MAX30100::MAX30100(){
+
+}
+
+void MAX30100::setLEDs(pulseWidth pw, ledCurrent red, ledCurrent ir){
+  uint8_t reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG);
+  reg = reg & 0xFC; // Set LED_PW to 00
+  I2CwriteByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, reg | pw);     // Mask LED_PW
+  I2CwriteByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG, (red<<4) | ir); // write LED configs
+}
+
+void MAX30100::setSPO2(sampleRate sr){
+  uint8_t reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG);
+  reg = reg & 0xE3; // Set SPO2_SR to 000
+  I2CwriteByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, reg | (sr<<2)); // Mask SPO2_SR
+  reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG);
+  reg = reg & 0xf8; // Set Mode to 000
+  I2CwriteByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, reg | 0x03); // Mask MODE
+}
+
+int MAX30100::getNumSamp(void){
+    uint8_t wrPtr = I2CreadByte(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR);
+    uint8_t rdPtr = I2CreadByte(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR);
+    return (abs( 16 + wrPtr - rdPtr ) % 16);
+}
+
+void MAX30100::readSensor(void){
+  uint8_t temp[4] = {0};  // Temporary buffer for read values
+  I2CreadBytes(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){
+  uint8_t reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG);  // Get the current register
+  I2CwriteByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, reg | 0x80);   // mask the SHDN bit
+}
+
+void MAX30100::reset(void){
+  uint8_t reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG);  // Get the current register
+  I2CwriteByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, reg | 0x40);   // mask the RESET bit
+}
+
+void MAX30100::startup(void){
+  uint8_t reg = I2CreadByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG);  // Get the current register
+  I2CwriteByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, reg & 0x7F);   // mask the SHDN bit
+}
+
+int MAX30100::getRevID(void){
+  return I2CreadByte(MAX30100_ADDRESS, MAX30100_REV_ID);
+}
+
+int MAX30100::getPartID(void){
+  return I2CreadByte(MAX30100_ADDRESS, MAX30100_PART_ID);
+}
+
+void MAX30100::begin(pulseWidth pw, ledCurrent ir, sampleRate sr){
+  I2CwriteByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, 0x03); // Heart rate only
+  I2CwriteByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG, 0XFF);
+   I2CwriteByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG, ir<<4|0x0f);
+  I2CwriteByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, (sr<<2)|pw);
+}
+
+//void MAX30100::printRegisters(void){
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_INT_STATUS),  BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_INT_ENABLE),  BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR), BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_OVRFLOW_CTR), BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR), BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_FIFO_DATA),   BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_MODE_CONFIG), BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG), BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_LED_CONFIG),  BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_TEMP_INTG),   BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_TEMP_FRAC),   BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_REV_ID),      BIN);
+//  Serial.println(I2CreadByte(MAX30100_ADDRESS, MAX30100_PART_ID),     BIN);
+//}
+
+// Wire.h read and write protocols
+void MAX30100::I2CwriteByte(uint8_t address, uint8_t subAddress, uint8_t data)
+{
+    //wire1.beginTransmission(address);  // Initialize the Tx buffer
+    //wire1.write(subAddress);           // Put slave register address in Tx buffer
+    //wire1.write(data);                 // Put data in Tx buffer
+    //wire1.endTransmission();           // Send the Tx buffer
+   write_i2c(subAddress, &data, 1, 0xAE);
+}
+
+uint8_t MAX30100::I2CreadByte(uint8_t address, uint8_t subAddress)
+{
+    uint8_t data; // `data` will store the register data
+    //wire.beginTransmission(address);         // Initialize the Tx buffer
+    //wire.write(subAddress);                  // Put slave register address in Tx buffer
+    //wire.endTransmission(false);             // Send the Tx buffer, but send a restart to keep connection alive
+    //wire.requestFrom(address, (uint8_t) 1);  // Read one byte from slave register address
+    //data = Wire.read();                      // Fill Rx buffer with result
+    read_i2c(subAddress, &data, 1, 0xAE);
+    return data;                             // Return data read from slave register
+}
+
+void MAX30100::I2CreadBytes(uint8_t address, uint8_t subAddress, uint8_t * dest, uint8_t count)
+{
+    //Wire.beginTransmission(address);   // Initialize the Tx buffer
+    // Next send the register to be read. OR with 0x80 to indicate multi-read.
+    //Wire.write(subAddress);     // Put slave register address in Tx buffer
+    //Wire.endTransmission(false);       // Send the Tx buffer, but send a restart to keep connection alive
+    //uint8_t i = 0;
+    //Wire.requestFrom(address, count);  // Read bytes from slave register address
+    //while (Wire.available())
+    //{
+    //    dest[i++] = Wire.read(); // Put read results in the Rx buffer
+    //}
+    read_i2c(subAddress, dest, count, 0xAE);
+}
\ No newline at end of file