Projektarbeit_Lichtklavier/SPI_DMX.cpp

#include "SPI_DMX.h"

#define SPI_FREQHz (8.0*8.0e5)
#define SPI_BYTEus ((8.0e6/SPI_FREQHz)*1.6) //weird translation factor idk
#define DMX_BITus 4
#define BREAKus (25*DMX_BITus)
#define MABus (3*DMX_BITus)
#define STARTus (DMX_BITus)
#define STOPus (2*DMX_BITus)

#define BY_HIGH	0x00
#define BY_LOW	0xFF



SPI_DMX::SPI_DMX(unsigned char serial_port)
{
	this->serial_port = serial_port;
	for(int i = 0; i < BREAKus/SPI_BYTEus; i++)
	{
		this->message[i] = BY_LOW;
	}
	for(int i = BREAKus/SPI_BYTEus; i < (BREAKus+MABus)/SPI_BYTEus; i++)
	{
		this->message[i] = BY_HIGH;
	}
	wiringPiSPISetup(serial_port,SPI_FREQHz);
	printf("%f\n",SPI_FREQHz);
}

SPI_DMX::~SPI_DMX()
{
	
}

void SPI_DMX::TX_Bytes(unsigned char* tx_buffer, unsigned char tx_size)
{
	//unsigned int SPIbits = (BREAKus+MABus+(size*(STARTus+8*DMX_BITus+STOPus)))/SPI_BITus;
	//unsigned char message[SPIbits];
	
	int messind = (BREAKus+MABus)/SPI_BYTEus;
	printf("%i\n",messind);
	
	for(int b = 0; b < tx_size; b++)
	{
		for(int i = 0; i < STARTus/SPI_BYTEus; i++)
		{
			message[messind++] = BY_LOW;
		} 
		for(int i = 0; i < 8; i++)
		{
			unsigned char txbit = tx_buffer[b];
			txbit = ~((((txbit >> i) & 0x01) ^ 0x01) * 0xFF); //NEEDS TO BE ADJUSTED IF LOGIC LEVEL IS REVERSED
			for(int i = 0; i < DMX_BITus/SPI_BYTEus; i++)
			{
				message[messind++] = txbit;
			}
		} 
		for(int i = 0; i < STOPus/SPI_BYTEus; i++)
		{
			message[messind++] = BY_HIGH;
		} 
	}	
	printf("%i\n",messind);
	/*messind = 0;
	for(int i = 0; i < 8; i++)
	{
		unsigned char txbit = tx_buffer[0];
		txbit = ((txbit >> i) & 0x01) * 0xFF;
		for(int i = 0; i < DMX_BITus/SPI_BYTEus; i++)
		{
			message[messind++] = txbit;
		}
		printf("%u %u %f %i \n",tx_buffer[0],txbit,DMX_BITus/SPI_BYTEus,messind);
	} */
	wiringPiSPIDataRW(this->serial_port, message, messind-1);
}