NRF52840-DK with MAX30003 ECG Board

Question

Hello, 
 I am trying to code nRF52840- DK with MAX30003 ECG Board Using SPI. I have referred Arduino Uno Code for MAX30003 ECG. 
 I need some help for Driver Development if anybody worked on this please share any info.

Thanks and Regards, 
 Rohit

haakonsh · Accepted Answer

The digital analyzer tool in Keil is not supported. You'll probably need a j-link Pro in order to use it, but I do not really know how to use that Keil feature. 
 I do not know what signal you are sampling with the oscilloscope, but you need to sample all four signals at the same time in order verify correct operation of the SPIM peripheral. You will also need to trigger the sampling from the transition of the chip/slave select signal from high to low, instead of a 'free running' sampling scheme like what you are doing. 
 
 I believe I've made a mistake in the code I posted: 
 " The content of the SPI operation consists of a one byte command word (comprised of a seven bit address and a Read/Write mode indicator, i.e., A[6:0] + R/W) followed by a three-byte data word." SPI_TX_Buff[0] = (Reg_address<<1 ) | RREG; // 0x1F, 0b00011111

// Should be:

SPI_TX_Buff[0] = Reg_address | (RREG << 7); // 0x8F, 0b10001111 
 Also, " Note: due to internal initialization procedures, this command will not read-back valid data if it is the first command executed following either a power-cycle event, or a SW_RST event." Finnaly I need to say that @awneil has a point. I can help you set up the SPIM drivers and verify that the SPIM peripheral is working as intended, but other than that you really should go to MAXIM for help. They probably have a driver that's easily ported to our platform.

NRF52840-DK with MAX30003 ECG Board

Top Replies