Bradley Kohler
/
PulseRate
MAX30100 pulse rate sensor
MAX30100.h@4:008e40a7d035, 2017-11-26 (annotated)
- Committer:
- kohlerba
- Date:
- Sun Nov 26 21:59:11 2017 +0000
- Revision:
- 4:008e40a7d035
- Parent:
- 3:fa37b0c705b3
Header file error fix
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kohlerba | 0:faf977308bdc | 1 | #ifndef MAX30100_H |
kohlerba | 0:faf977308bdc | 2 | #define MAX30100_H |
kohlerba | 0:faf977308bdc | 3 | |
kohlerba | 0:faf977308bdc | 4 | #include "mbed.h" |
kohlerba | 0:faf977308bdc | 5 | |
kohlerba | 0:faf977308bdc | 6 | //definitions |
kohlerba | 3:fa37b0c705b3 | 7 | #define MAX30100_ADDRESS 0xAE |
kohlerba | 0:faf977308bdc | 8 | |
kohlerba | 0:faf977308bdc | 9 | // Registers |
kohlerba | 0:faf977308bdc | 10 | #define MAX30100_INT_STATUS 0x00 // Which interrupts are tripped |
kohlerba | 0:faf977308bdc | 11 | #define MAX30100_INT_ENABLE 0x01 // Which interrupts are active |
kohlerba | 0:faf977308bdc | 12 | #define MAX30100_FIFO_WR_PTR 0x02 // Where data is being written |
kohlerba | 0:faf977308bdc | 13 | #define MAX30100_OVRFLOW_CTR 0x03 // Number of lost samples |
kohlerba | 0:faf977308bdc | 14 | #define MAX30100_FIFO_RD_PTR 0x04 // Where to read from |
kohlerba | 0:faf977308bdc | 15 | #define MAX30100_FIFO_DATA 0x05 // Ouput data buffer |
kohlerba | 0:faf977308bdc | 16 | #define MAX30100_MODE_CONFIG 0x06 // Control register |
kohlerba | 0:faf977308bdc | 17 | #define MAX30100_SPO2_CONFIG 0x07 // Oximetry settings |
kohlerba | 0:faf977308bdc | 18 | #define MAX30100_LED_CONFIG 0x09 // Pulse width and power of LEDs |
kohlerba | 0:faf977308bdc | 19 | #define MAX30100_TEMP_INTG 0x16 // Temperature value, whole number |
kohlerba | 0:faf977308bdc | 20 | #define MAX30100_TEMP_FRAC 0x17 // Temperature value, fraction |
kohlerba | 0:faf977308bdc | 21 | #define MAX30100_REV_ID 0xFE // Part revision |
kohlerba | 0:faf977308bdc | 22 | #define MAX30100_PART_ID 0xFF // Part ID, normally 0x11 |
kohlerba | 0:faf977308bdc | 23 | |
kohlerba | 2:d329886938f1 | 24 | #define POR_PART_ID 0x11 |
kohlerba | 2:d329886938f1 | 25 | |
kohlerba | 4:008e40a7d035 | 26 | //Mode Configuration register |
kohlerba | 4:008e40a7d035 | 27 | #define MAX30100_MC_TEMP_EN (1 << 3) |
kohlerba | 4:008e40a7d035 | 28 | #define MAX30100_MC_RESET (1 << 6) |
kohlerba | 4:008e40a7d035 | 29 | #define MAX30100_MC_SHDN (1 << 7) |
kohlerba | 4:008e40a7d035 | 30 | |
kohlerba | 4:008e40a7d035 | 31 | typedef enum Mode { |
kohlerba | 4:008e40a7d035 | 32 | MAX30100_MODE_HRONLY = 0x02, |
kohlerba | 4:008e40a7d035 | 33 | MAX30100_MODE_SPO2_HR = 0x03 |
kohlerba | 4:008e40a7d035 | 34 | } Mode; |
kohlerba | 0:faf977308bdc | 35 | |
kohlerba | 4:008e40a7d035 | 36 | // SpO2 Configuration register |
kohlerba | 4:008e40a7d035 | 37 | // Check tables 8 and 9, p19 of the MAX30100 datasheet to see the permissible |
kohlerba | 4:008e40a7d035 | 38 | // combinations of sampling rates and pulse widths |
kohlerba | 4:008e40a7d035 | 39 | #define MAX30100_SPC_SPO2_HI_RES_EN (1 << 6) |
kohlerba | 4:008e40a7d035 | 40 | typedef enum SamplingRate { |
kohlerba | 4:008e40a7d035 | 41 | MAX30100_SAMPRATE_50HZ = 0x00, |
kohlerba | 4:008e40a7d035 | 42 | MAX30100_SAMPRATE_100HZ = 0x01, |
kohlerba | 4:008e40a7d035 | 43 | MAX30100_SAMPRATE_167HZ = 0x02, |
kohlerba | 4:008e40a7d035 | 44 | MAX30100_SAMPRATE_200HZ = 0x03, |
kohlerba | 4:008e40a7d035 | 45 | MAX30100_SAMPRATE_400HZ = 0x04, |
kohlerba | 4:008e40a7d035 | 46 | MAX30100_SAMPRATE_600HZ = 0x05, |
kohlerba | 4:008e40a7d035 | 47 | MAX30100_SAMPRATE_800HZ = 0x06, |
kohlerba | 4:008e40a7d035 | 48 | MAX30100_SAMPRATE_1000HZ = 0x07 |
kohlerba | 4:008e40a7d035 | 49 | } SamplingRate; |
kohlerba | 0:faf977308bdc | 50 | |
kohlerba | 4:008e40a7d035 | 51 | typedef enum LEDPulseWidth { |
kohlerba | 4:008e40a7d035 | 52 | MAX30100_SPC_PW_200US_13BITS = 0x00, |
kohlerba | 4:008e40a7d035 | 53 | MAX30100_SPC_PW_400US_14BITS = 0x01, |
kohlerba | 4:008e40a7d035 | 54 | MAX30100_SPC_PW_800US_15BITS = 0x02, |
kohlerba | 4:008e40a7d035 | 55 | MAX30100_SPC_PW_1600US_16BITS = 0x03 |
kohlerba | 4:008e40a7d035 | 56 | } LEDPulseWidth; |
kohlerba | 4:008e40a7d035 | 57 | |
kohlerba | 4:008e40a7d035 | 58 | // LED Configuration register |
kohlerba | 4:008e40a7d035 | 59 | typedef enum LEDCurrent { |
kohlerba | 4:008e40a7d035 | 60 | MAX30100_LED_CURR_0MA = 0x00, |
kohlerba | 4:008e40a7d035 | 61 | MAX30100_LED_CURR_4_4MA = 0x01, |
kohlerba | 4:008e40a7d035 | 62 | MAX30100_LED_CURR_7_6MA = 0x02, |
kohlerba | 4:008e40a7d035 | 63 | MAX30100_LED_CURR_11MA = 0x03, |
kohlerba | 4:008e40a7d035 | 64 | MAX30100_LED_CURR_14_2MA = 0x04, |
kohlerba | 4:008e40a7d035 | 65 | MAX30100_LED_CURR_17_4MA = 0x05, |
kohlerba | 4:008e40a7d035 | 66 | MAX30100_LED_CURR_20_8MA = 0x06, |
kohlerba | 4:008e40a7d035 | 67 | MAX30100_LED_CURR_24MA = 0x07, |
kohlerba | 4:008e40a7d035 | 68 | MAX30100_LED_CURR_27_1MA = 0x08, |
kohlerba | 4:008e40a7d035 | 69 | MAX30100_LED_CURR_30_6MA = 0x09, |
kohlerba | 4:008e40a7d035 | 70 | MAX30100_LED_CURR_33_8MA = 0x0a, |
kohlerba | 4:008e40a7d035 | 71 | MAX30100_LED_CURR_37MA = 0x0b, |
kohlerba | 4:008e40a7d035 | 72 | MAX30100_LED_CURR_40_2MA = 0x0c, |
kohlerba | 4:008e40a7d035 | 73 | MAX30100_LED_CURR_43_6MA = 0x0d, |
kohlerba | 4:008e40a7d035 | 74 | MAX30100_LED_CURR_46_8MA = 0x0e, |
kohlerba | 4:008e40a7d035 | 75 | MAX30100_LED_CURR_50MA = 0x0f |
kohlerba | 4:008e40a7d035 | 76 | } LEDCurrent; |
kohlerba | 4:008e40a7d035 | 77 | |
kohlerba | 4:008e40a7d035 | 78 | #define DEFAULT_MODE MAX30100_MODE_HRONLY |
kohlerba | 4:008e40a7d035 | 79 | #define DEFAULT_SAMPLING_RATE MAX30100_SAMPRATE_100HZ |
kohlerba | 4:008e40a7d035 | 80 | #define DEFAULT_PULSE_WIDTH MAX30100_SPC_PW_1600US_16BITS |
kohlerba | 4:008e40a7d035 | 81 | #define DEFAULT_RED_LED_CURRENT MAX30100_LED_CURR_50MA |
kohlerba | 4:008e40a7d035 | 82 | #define DEFAULT_IR_LED_CURRENT MAX30100_LED_CURR_50MA |
kohlerba | 4:008e40a7d035 | 83 | #define EXPECTED_PART_ID 0x11 |
kohlerba | 0:faf977308bdc | 84 | |
kohlerba | 0:faf977308bdc | 85 | //Set up I2C, (SDA,SCL) |
kohlerba | 3:fa37b0c705b3 | 86 | static I2C i2c(I2C_SDA, I2C_SCL); |
kohlerba | 3:fa37b0c705b3 | 87 | static Serial pc(USBTX, USBRX); // tx, rx |
kohlerba | 0:faf977308bdc | 88 | |
kohlerba | 0:faf977308bdc | 89 | class MAX30100 { |
kohlerba | 0:faf977308bdc | 90 | |
kohlerba | 0:faf977308bdc | 91 | protected: |
kohlerba | 0:faf977308bdc | 92 | |
kohlerba | 0:faf977308bdc | 93 | public: |
kohlerba | 0:faf977308bdc | 94 | |
kohlerba | 4:008e40a7d035 | 95 | //Variables |
kohlerba | 4:008e40a7d035 | 96 | uint16_t rawIRValue; |
kohlerba | 4:008e40a7d035 | 97 | uint16_t rawRedValue; |
kohlerba | 4:008e40a7d035 | 98 | |
kohlerba | 2:d329886938f1 | 99 | //Wire read and write protocols |
kohlerba | 3:fa37b0c705b3 | 100 | static int i2c_write (uint8_t i2c_addr, uint8_t register_addr, char* buffer, uint8_t Nbyte ) |
kohlerba | 0:faf977308bdc | 101 | { |
kohlerba | 3:fa37b0c705b3 | 102 | int ret; |
kohlerba | 3:fa37b0c705b3 | 103 | char *tmp_buffer; |
kohlerba | 3:fa37b0c705b3 | 104 | |
kohlerba | 3:fa37b0c705b3 | 105 | tmp_buffer = (char*)malloc(sizeof(char)*(Nbyte+1)); |
kohlerba | 0:faf977308bdc | 106 | |
kohlerba | 3:fa37b0c705b3 | 107 | /* First, send device address. Then, send data and STOP condition */ |
kohlerba | 3:fa37b0c705b3 | 108 | tmp_buffer[0] = register_addr; |
kohlerba | 3:fa37b0c705b3 | 109 | memcpy(tmp_buffer+1, buffer, Nbyte); |
kohlerba | 3:fa37b0c705b3 | 110 | |
kohlerba | 3:fa37b0c705b3 | 111 | ret = i2c.write(i2c_addr, tmp_buffer, Nbyte+1, false); |
kohlerba | 3:fa37b0c705b3 | 112 | |
kohlerba | 3:fa37b0c705b3 | 113 | return ret; |
kohlerba | 0:faf977308bdc | 114 | } |
kohlerba | 0:faf977308bdc | 115 | |
kohlerba | 3:fa37b0c705b3 | 116 | static int i2c_read (uint8_t i2c_addr, uint8_t register_addr, char* buffer, uint8_t Nbyte ) |
kohlerba | 3:fa37b0c705b3 | 117 | { |
kohlerba | 3:fa37b0c705b3 | 118 | int ret; |
kohlerba | 3:fa37b0c705b3 | 119 | |
kohlerba | 3:fa37b0c705b3 | 120 | /* Send device address, with no STOP condition */ |
kohlerba | 3:fa37b0c705b3 | 121 | ret = i2c.write(i2c_addr, (const char*)®ister_addr, 1, true); |
kohlerba | 3:fa37b0c705b3 | 122 | if(!ret) { |
kohlerba | 3:fa37b0c705b3 | 123 | /* Read data, with STOP condition */ |
kohlerba | 3:fa37b0c705b3 | 124 | ret = i2c.read((i2c_addr|0x01), buffer, Nbyte, false); |
kohlerba | 0:faf977308bdc | 125 | } |
kohlerba | 3:fa37b0c705b3 | 126 | |
kohlerba | 3:fa37b0c705b3 | 127 | return ret; |
kohlerba | 0:faf977308bdc | 128 | } |
kohlerba | 2:d329886938f1 | 129 | // |
kohlerba | 0:faf977308bdc | 130 | |
kohlerba | 3:fa37b0c705b3 | 131 | uint8_t getRevID(void){ |
kohlerba | 3:fa37b0c705b3 | 132 | char buffer[1]; |
kohlerba | 3:fa37b0c705b3 | 133 | i2c_read(MAX30100_ADDRESS, MAX30100_REV_ID, &buffer[0], 1); |
kohlerba | 3:fa37b0c705b3 | 134 | return buffer[0]; |
kohlerba | 0:faf977308bdc | 135 | } |
kohlerba | 0:faf977308bdc | 136 | |
kohlerba | 3:fa37b0c705b3 | 137 | uint8_t getPartID(void){ |
kohlerba | 3:fa37b0c705b3 | 138 | char buffer[1]; |
kohlerba | 3:fa37b0c705b3 | 139 | i2c_read(MAX30100_ADDRESS, MAX30100_PART_ID, &buffer[0], 1); |
kohlerba | 3:fa37b0c705b3 | 140 | return buffer[0]; |
kohlerba | 0:faf977308bdc | 141 | } |
kohlerba | 0:faf977308bdc | 142 | |
kohlerba | 4:008e40a7d035 | 143 | void shutdown(void){ |
kohlerba | 4:008e40a7d035 | 144 | char reg[1]; |
kohlerba | 4:008e40a7d035 | 145 | i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 146 | reg[0] = reg[0] | MAX30100_MC_SHDN; |
kohlerba | 4:008e40a7d035 | 147 | i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, ®[0], 1); |
kohlerba | 0:faf977308bdc | 148 | } |
kohlerba | 3:fa37b0c705b3 | 149 | |
kohlerba | 4:008e40a7d035 | 150 | void resume(void){ |
kohlerba | 4:008e40a7d035 | 151 | char reg[1]; |
kohlerba | 4:008e40a7d035 | 152 | i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 153 | reg[0] = reg[0] & ~MAX30100_MC_SHDN; |
kohlerba | 4:008e40a7d035 | 154 | i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 155 | } |
kohlerba | 4:008e40a7d035 | 156 | |
kohlerba | 4:008e40a7d035 | 157 | void update(void){ |
kohlerba | 4:008e40a7d035 | 158 | readFifoData(); |
kohlerba | 4:008e40a7d035 | 159 | } |
kohlerba | 4:008e40a7d035 | 160 | |
kohlerba | 4:008e40a7d035 | 161 | void printRegisters(void){ |
kohlerba | 3:fa37b0c705b3 | 162 | char reg[1]; |
kohlerba | 3:fa37b0c705b3 | 163 | i2c_read(MAX30100_ADDRESS, MAX30100_INT_STATUS, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 164 | pc.printf("MAX30100_INT_STATUS: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 165 | i2c_read(MAX30100_ADDRESS, MAX30100_INT_ENABLE, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 166 | pc.printf("MAX30100_INT_ENABLE: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 167 | i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_WR_PTR, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 168 | pc.printf("MAX30100_FIFO_WR_PTR: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 169 | i2c_read(MAX30100_ADDRESS, MAX30100_OVRFLOW_CTR, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 170 | pc.printf("MAX30100_OVRFLOW_CTR: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 171 | i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_RD_PTR, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 172 | pc.printf("MAX30100_FIFO_RD_PTR: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 173 | i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_DATA, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 174 | pc.printf("MAX30100_FIFO_DATA: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 175 | i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 176 | pc.printf("MAX30100_MODE_CONFIG: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 177 | i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 178 | pc.printf("MAX30100_SPO2_CONFIG: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 179 | i2c_read(MAX30100_ADDRESS, MAX30100_LED_CONFIG, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 180 | pc.printf("MAX30100_LED_CONFIG: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 181 | i2c_read(MAX30100_ADDRESS, MAX30100_TEMP_INTG, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 182 | pc.printf("MAX30100_TEMP_INTG: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 183 | i2c_read(MAX30100_ADDRESS, MAX30100_TEMP_FRAC, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 184 | pc.printf("MAX30100_TEMP_FRAC: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 185 | i2c_read(MAX30100_ADDRESS, MAX30100_REV_ID, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 186 | pc.printf("MAX30100_REV_ID: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 187 | i2c_read(MAX30100_ADDRESS, MAX30100_PART_ID, ®[0], 1); |
kohlerba | 3:fa37b0c705b3 | 188 | pc.printf("MAX30100_PART_ID: %d\r\n",reg[0]); |
kohlerba | 3:fa37b0c705b3 | 189 | } |
kohlerba | 3:fa37b0c705b3 | 190 | |
kohlerba | 4:008e40a7d035 | 191 | bool begin(){ |
kohlerba | 4:008e40a7d035 | 192 | if(getPartID() != POR_PART_ID){ |
kohlerba | 4:008e40a7d035 | 193 | return false; |
kohlerba | 4:008e40a7d035 | 194 | } |
kohlerba | 4:008e40a7d035 | 195 | setMode(DEFAULT_MODE); |
kohlerba | 4:008e40a7d035 | 196 | setLedsPulseWidth(DEFAULT_PULSE_WIDTH); |
kohlerba | 4:008e40a7d035 | 197 | setSamplingRate(DEFAULT_SAMPLING_RATE); |
kohlerba | 4:008e40a7d035 | 198 | setLedsCurrent(DEFAULT_IR_LED_CURRENT, DEFAULT_RED_LED_CURRENT); |
kohlerba | 4:008e40a7d035 | 199 | setHighresModeEnabled(true); |
kohlerba | 4:008e40a7d035 | 200 | |
kohlerba | 4:008e40a7d035 | 201 | return true; |
kohlerba | 4:008e40a7d035 | 202 | } |
kohlerba | 4:008e40a7d035 | 203 | |
kohlerba | 4:008e40a7d035 | 204 | void setMode(Mode mode){ |
kohlerba | 4:008e40a7d035 | 205 | char reg[1]; |
kohlerba | 4:008e40a7d035 | 206 | reg[0] = mode; |
kohlerba | 4:008e40a7d035 | 207 | i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 208 | } |
kohlerba | 4:008e40a7d035 | 209 | |
kohlerba | 4:008e40a7d035 | 210 | void setLedsPulseWidth(LEDPulseWidth ledPulseWidth){ |
kohlerba | 4:008e40a7d035 | 211 | char reg[1]; |
kohlerba | 4:008e40a7d035 | 212 | i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 213 | reg[0] = (reg[0] & 0xfc) | ledPulseWidth; |
kohlerba | 4:008e40a7d035 | 214 | i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 215 | } |
kohlerba | 4:008e40a7d035 | 216 | |
kohlerba | 4:008e40a7d035 | 217 | void setSamplingRate(SamplingRate samplingRate){ |
kohlerba | 4:008e40a7d035 | 218 | char reg[1]; |
kohlerba | 4:008e40a7d035 | 219 | i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 220 | reg[0] = (reg[0] & 0xe3) | (samplingRate << 2); |
kohlerba | 4:008e40a7d035 | 221 | i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 222 | } |
kohlerba | 4:008e40a7d035 | 223 | |
kohlerba | 4:008e40a7d035 | 224 | void setLedsCurrent(LEDCurrent irLedCurrent, LEDCurrent redLedCurrent){ |
kohlerba | 4:008e40a7d035 | 225 | char reg[1]; |
kohlerba | 4:008e40a7d035 | 226 | reg[0] = (redLedCurrent << 4) | irLedCurrent; |
kohlerba | 4:008e40a7d035 | 227 | i2c_write(MAX30100_ADDRESS, MAX30100_LED_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 228 | } |
kohlerba | 4:008e40a7d035 | 229 | |
kohlerba | 4:008e40a7d035 | 230 | void setHighresModeEnabled(bool enabled){ |
kohlerba | 4:008e40a7d035 | 231 | char reg[1]; |
kohlerba | 4:008e40a7d035 | 232 | i2c_read(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 233 | if(enabled){ |
kohlerba | 4:008e40a7d035 | 234 | reg[0] = reg[0] | MAX30100_SPC_SPO2_HI_RES_EN; |
kohlerba | 4:008e40a7d035 | 235 | } |
kohlerba | 4:008e40a7d035 | 236 | else{ |
kohlerba | 4:008e40a7d035 | 237 | reg[0] = reg[0] & ~MAX30100_SPC_SPO2_HI_RES_EN; |
kohlerba | 4:008e40a7d035 | 238 | } |
kohlerba | 4:008e40a7d035 | 239 | i2c_write(MAX30100_ADDRESS, MAX30100_SPO2_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 240 | } |
kohlerba | 4:008e40a7d035 | 241 | |
kohlerba | 4:008e40a7d035 | 242 | void readFifoData(void){ |
kohlerba | 4:008e40a7d035 | 243 | char reg[4]; |
kohlerba | 4:008e40a7d035 | 244 | i2c_read(MAX30100_ADDRESS, MAX30100_FIFO_DATA, ®[0], 4); |
kohlerba | 4:008e40a7d035 | 245 | rawIRValue = (reg[0] << 8) | reg[1]; |
kohlerba | 4:008e40a7d035 | 246 | rawRedValue = (reg[2] << 8) | reg[3]; |
kohlerba | 4:008e40a7d035 | 247 | } |
kohlerba | 4:008e40a7d035 | 248 | |
kohlerba | 4:008e40a7d035 | 249 | void startTemperatureSampling(void){ |
kohlerba | 4:008e40a7d035 | 250 | char reg[1]; |
kohlerba | 4:008e40a7d035 | 251 | i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 252 | reg[0] = reg[0] | MAX30100_MC_TEMP_EN; |
kohlerba | 4:008e40a7d035 | 253 | i2c_write(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 254 | } |
kohlerba | 4:008e40a7d035 | 255 | |
kohlerba | 4:008e40a7d035 | 256 | bool isTemperatureReady(void){ |
kohlerba | 4:008e40a7d035 | 257 | char reg[1]; |
kohlerba | 4:008e40a7d035 | 258 | bool ret; |
kohlerba | 4:008e40a7d035 | 259 | ret = i2c_read(MAX30100_ADDRESS, MAX30100_MODE_CONFIG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 260 | ret = ret & MAX30100_MC_TEMP_EN; |
kohlerba | 4:008e40a7d035 | 261 | return !ret; |
kohlerba | 4:008e40a7d035 | 262 | } |
kohlerba | 4:008e40a7d035 | 263 | |
kohlerba | 4:008e40a7d035 | 264 | float retrieveTemperature(void){ |
kohlerba | 4:008e40a7d035 | 265 | char reg[2]; |
kohlerba | 4:008e40a7d035 | 266 | i2c_read(MAX30100_ADDRESS, MAX30100_TEMP_INTG, ®[0], 1); |
kohlerba | 4:008e40a7d035 | 267 | i2c_read(MAX30100_ADDRESS, MAX30100_TEMP_FRAC, ®[1], 1); |
kohlerba | 4:008e40a7d035 | 268 | return reg[0] + (reg[1] * 0.0625); |
kohlerba | 4:008e40a7d035 | 269 | } |
kohlerba | 4:008e40a7d035 | 270 | |
kohlerba | 1:0c2135629097 | 271 | }; |
kohlerba | 0:faf977308bdc | 272 | #endif |