DMX_Interface

bisher rudimentäres DMX Interface über RasPi SPI 0.

DMX_Interface.cpp

+#include <stdio.h>
+//#include "UART.h"
+#include <wiringPiSPI.h>
+#include "SPI_DMX.h"
+
+# define measure_length(type) ((char *)(&type+1)-(char*)(&type))
+
+/* demo.c:  My first C program on a Linux */
+int main(void)
+{
+	printf("Hello! This is a test prgoram.\n");
+	SPI_DMX spi1(0);
+	spi1.nice();
+	
+	unsigned char message[4] = {0x55,0x66,0x55,0x66};
+	//uart.TX_Bytes(message,measure_length(message));
+ 
+	spi1.TX_Bytes(message,4);
+	
+	return 0;
+}

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);
+}

SPI_DMX.h

+#include <stdio.h>
+#include <wiringPiSPI.h>
+
+
+class SPI_DMX
+{
+private:
+	int uart_filestream;
+	unsigned char serial_port;
+	unsigned char message[5000];
+public:
+	SPI_DMX(unsigned char serial_port);
+	~SPI_DMX();
+	void TX_Bytes(unsigned char* tx_buffer, unsigned char tx_size);
+	void nice() {printf("nice\n");};
+};

blink.cpp

+#include <wiringPi.h>
+int main (void)
+{
+  wiringPiSetup () ;
+  pinMode (0, OUTPUT) ;
+  for (;;)
+  {
+    digitalWrite (0, HIGH) ; delay (500) ;
+    digitalWrite (0,  LOW) ; delay (500) ;
+  }
+  return 0 ;
+}