SPI_for_AFE.cpp

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#include "AFE_NXP.h"
 
void SPI_for_AFE::txrx( uint8_t *data, int size )
{
//  data[ 0 ]   |= dev_ad ? 0x80 : 0x00;
 
    SPI.beginTransaction( SPISettings( frequency, MSBFIRST, SPI_MODE1 ) );
    digitalWrite( SS, LOW );
    SPI.transfer( data, size );
    digitalWrite( SS, HIGH );
}
 
void SPI_for_AFE::write_r16( uint16_t reg )
{
    reg <<= 1;
 
    uint8_t v[] = { (uint8_t)(reg >> 8), (uint8_t)(reg & 0xFF) };
    txrx( v, sizeof( v ) );
}
 
void SPI_for_AFE::write_r16( uint16_t reg, uint16_t val )
{
    reg <<= 1;
 
    uint8_t v[] = { (uint8_t)(reg >> 8), (uint8_t)(reg & 0xFF), (uint8_t)(val >> 8), (uint8_t)val };
    txrx( v, sizeof( v ) );
}
 
uint16_t SPI_for_AFE::read_r16( uint16_t reg )
{
    reg <<= 1;
    reg  |= 0x4000;
 
    uint8_t v[ 4 ]  = { (uint8_t)(reg >> 8), (uint8_t)(reg & 0xFF), 0xFF, 0xFF };
    txrx( v, sizeof( v ) );
    
    return get_data16( v + command_length );
}
 
void SPI_for_AFE::write_r24( uint16_t reg, uint32_t val )
{
    reg <<= 1;
 
    uint8_t v[] = { (uint8_t)(reg >> 8), (uint8_t)(reg & 0xFF), (uint8_t)(val >> 16), (uint8_t)(val >> 8), (uint8_t)val };
    txrx( v, sizeof( v ) );
}
 
int32_t SPI_for_AFE::read_r24( uint16_t reg )
{
    reg <<= 1;
    reg  |= 0x4000;
 
    uint8_t v[] = { (uint8_t)(reg >> 8), (uint8_t)(reg & 0xFF), 0xFF, 0xFF, 0xFF };
    txrx( v, sizeof( v ) );
    
    return get_data24( v + command_length );
}
 
void SPI_for_AFE::burst( uint32_t *data, int length, int width )
{
    uint8_t     v[ command_length + 3 * 16 ];
    uint16_t    reg   = (0x2005 << 1) | 0x4000; // CMD_BURST_DATA
 
    v[ 0 ]  = (uint8_t)(reg >> 8);
    v[ 1 ]  = (uint8_t)(reg & 0xFF);
    
    txrx( v, command_length + length * width );
    
    for ( auto i = 0; i < length; i++ )
        *data++ = get_data24( v + command_length + i * width );
}
 
void SPI_for_AFE::spi_frequency( uint32_t f )
{
    frequency   = f;
}
 
void SPI_for_AFE::init( void )
{
    spi_frequency();
    
    digitalWrite(SS, HIGH); //  to set proper SPI_CS = HIGH before command/register access
    delay( 1 );
}