Pmod ALS SPI recieve with ATMega 328PB

[Brandon Dinsmore]

I'm having some difficulty setting up SPI to receive data from the the PmodALS. I'm using the 328PB board with the initialization and receive code below:

 

void SPI_MasterInit(void)
{
    
    DDRC |= (1<<PORTC1); //set SCK (PC1) to output. 
    DDRC &= ~(1<<PORTC0); //Set MISO (PC0) as input.
    
    DDRE |= (1<<PORTE3) | (1<<PORTE2); // Set MOSI (PE3) to output and SS (PE2) to output
    

    // Enable SPI, Master
    SPCR1 |= (1<<SPE1) | (1<<MSTR1) | (1<<SPR10); //Set to /16 prescaler so peripheral PmodALS operates at 1MHZ
}

 

// Sends a 16bit word (command + data) to DAC over SPI
int SPI_receiver_for_ALS(void)
{
        
        PORTE &= ~(1<<PORTE2);            // Pull Slave_Select (PORTE2) low to tell it to start reporting
    

        data = (SPDR1 << 8);            //Take first 8 bits of information
        while(!(SPSR1 & (1<<SPIF1)));    // Wait for transmission complete
        
                 
        data |= (SPDR1 >> 8);            //Take last 8 bits of information
        while(!(SPSR1 & (1<<SPIF1)));    // Wait for transmission complete
        
        PORTE |= (1<<PORTE2);            // Pull Slave_Select (PORTE2) high to tell it to stop reporting
                
        return data;
        
}

 

The program gets stuck in the wait for transfer loop, and outputs no data values. When I disable it, I receive values of zero.

I've scoured the datasheets and I'm not sure what I missed. Does anybody have an insights to what I need to do? (I attached the rest of my code as reference)

 

Thanks a lot!

main.c uart.c uart.h

PmodALS datasheet.pdf