MAX86140 datasheet(21/89 Pages) MAXIM

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Pseudo-Code Example of Reading Data from FIFO

Example pseudo-code for reading data from FIFO when using single photodiode channel and two LED channels.

void device_data_read(void) {

uint8_t sampleCnt;

uint8_t regVal;

uint8_t dataBuf[128*2*3];

//128 FIFO samples, 2 channel, 3 byte/channel

int led1[32];

int led2[32];

ReadReg(0x07, &sampleCnt);

//Read FIFO

ReadFifo(dataBuf, sampleCnt * 3);

int i = 0;

for ( i = 0; i < sampleCnt; i++ ) {

led1[i] = ((dataBuf[i*6+0] << 16 ) | (dataBuf[i*6+1] << 8) | (dataBuf[i*6+2])) &

0x7ffff;

led2[i] = ((dataBuf[i*6+3] << 16 ) | (dataBuf[i*6+4] << 8) | (dataBuf[i*6+5])) &

0x7ffff;

}

Example pseudo-code for reading data from FIFO when using dual photodiode channels and two LED channels.

void device_data_read(void) {

uint8_t sampleCnt;

uint8_t regVal;

uint8_t dataBuf[128*2*2*3];

//128 FIFO samples, 2 channel, 2 PD, 3 byte/channel

int led1A[32];

int led1B[32];

int led2A[32];

int led2B[32];

ReadReg(0x07, &sampleCnt);

//Read FIFO

ReadFifo(dataBuf, sampleCnt * 3);

int i = 0;

for ( i = 0; i < sampleCnt; i++ ) {

led1A[i] = ((dataBuf[i*12+0] << 16 ) | (dataBuf[i*12+1] << 8) | (dataBuf[i*12+2])) &

0x7ffff;

// LED1, PD1

led1B[i] = ((dataBuf[i*12+3] << 16 ) | (dataBuf[i*12+4] << 8) | (dataBuf[i*12+5])) &

0x7ffff;

// LED1, PD2

led2A[i] = ((dataBuf[i*12+6] << 16 ) | (dataBuf[i*12+7] << 8) | (dataBuf[i*12+8])) &

0x7ffff;

// LED2, PD1

led2B[i] = ((dataBuf[i*12+9] << 16 ) | (dataBuf[i*12+10] << 8) | (dataBuf[i*12+11]))

& 0x7ffff;

// LED2, PD2

}

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