SPI_for_RTC.cpp

#include "RTC_NXP.h"
 
void SPI_for_RTC::txrx( uint8_t *data, int size )
{
    digitalWrite( SS, LOW );
    SPI.transfer( data, size );
    digitalWrite( SS, HIGH );
}
 
void SPI_for_RTC::reg_w( uint8_t reg_adr, uint8_t *data, int size )
{
    uint8_t v[ size + 1 ];
    
    v[ 0 ]  = reg_adr;
    memcpy( v + 1, data, size );
    
    txrx( v, sizeof( v ) );
}
 
void SPI_for_RTC::reg_w( uint8_t reg_adr, uint8_t data )
{
    uint8_t v[] = { reg_adr, data };
    
    txrx( v, sizeof( v ) );
}
 
void SPI_for_RTC::reg_r( uint8_t reg_adr, uint8_t *data, int size )
{
    uint8_t v[ size + 1 ];
    
    for ( int i = 0; i < size + 1; i++ ) v[ i ] = 0xFF;
    
    v[ 0 ]  = (uint8_t)(reg_adr | 0x80);
    
    txrx( v, sizeof( v ) );
    
    memcpy( data, v + 1, size );
}
 
uint8_t SPI_for_RTC::reg_r( uint8_t reg_adr )
{
    uint8_t v[] = { (uint8_t)(reg_adr | 0x80), 0xFF };
    
    txrx( v, sizeof( v ) );
    
    return v[ 1 ];
}
 
void SPI_for_RTC::write_r8( uint8_t reg, uint8_t val )
{
    reg_w( reg, val );
}
 
uint8_t SPI_for_RTC::read_r8( uint8_t reg )
{
    return reg_r( reg );
}
 
void SPI_for_RTC::bit_op8(  uint8_t reg,  uint8_t mask,  uint8_t value )
{
    uint8_t tmp = reg_r( reg ) & mask;
    reg_w( reg, tmp | value );
}