RE: Reading MAX32664 and MAX30101 (SparkFun pulse oximetry and heart rate sensor) with nRF52832?

Bart Peirens — Wed, 07 Oct 2020 19:56:37 GMT

I also want to communicate with a Max32664 but I can't get the sensor to start.

I think this should just start the sensor or at least light up the LEDs

https://pdfserv.maximintegrated.com/en/an/user-guide-6922-max32664b-quick-start-guide-rev2-p1.pdf

table2 page 9

ret_code_t err_code;

nrfx_twim_config_t config;
config.hold_bus_uninit = false;
config.scl = SCL_PIN;
config.sda = SDA_PIN;
config.frequency = NRF_TWIM_FREQ_400K;

nrfx_twim_init(&m_twim_ppg, &config, NULL, NULL);
nrfx_twim_enable(&m_twim_ppg);

uint8_t cmd[4] = {0x44,0x04,0x01,0x01};
uint8_t response[1];
memset(response,0,1);

nrfx_twim_xfer_desc_t xfer;
xfer.address = ADDRESS_WRITE;
xfer.p_primary_buf = &cmd;
xfer.primary_length = sizeof(cmd);
xfer.p_secondary_buf = &response;
xfer.secondary_length = sizeof(response);
xfer.type = NRFX_TWIM_XFER_TX;

err_code = nrfx_twim_xfer(&m_twim_ppg, &xfer, 0);

are you willing to share your code if you got it working?

RE: Reading MAX32664 and MAX30101 (SparkFun pulse oximetry and heart rate sensor) with nRF52832?

Carl Richard — Mon, 31 Aug 2020 11:43:56 GMT

Hello!

As Simon says in this thread we do not have any examples specifically for these sensors. However, an implementation should be possible using our TWI peripheral examples in combination with the sensor datasheet and similar implementations (like the Arduino library you mention).

From what I could find on the forums and github there aren't any public implementations using our hardware as of now. (This contains a small usage example for the MAX30105).

Best regards,
Carl Richard