{"id":531,"date":"2010-10-17T17:33:39","date_gmt":"2010-10-17T21:33:39","guid":{"rendered":"http:\/\/protofusion.org\/wordpress\/?p=531"},"modified":"2010-11-21T00:53:07","modified_gmt":"2010-11-21T04:53:07","slug":"the-osram-slg2016-and-avr","status":"publish","type":"post","link":"http:\/\/protofusion.org\/wordpress\/2010\/10\/the-osram-slg2016-and-avr\/","title":{"rendered":"The OSRAM SLG2016 and AVR"},"content":{"rendered":"

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I happened to scavenge a couple of SLG2016’s from some old workstation debug displays. After finally locating a datasheet, I realized that they used the standard ASCII charset, so they are extremely easy to drive. Note: The SLG2016 differs from the SLR2016, SLO2016, and SLY2016 only by LED color.<\/em><\/p>\n

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The only downside to these displays is that they use quite a few pins (7 data lines, 2 digit select lines, write line, and optional blanking line). For now, I’m driving the display with all pins in\u00a0parallel\u00a0on a tiny88 which has plenty of pins; however I plan on using a shift register to cut down on data bus pin usage in the future. The displays only need the data lines to be held stable during a write cycle, making shift registers well-suited to this task.<\/p>\n

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To flash the attiny88, I’m using a Bus Pirate<\/a> (pictured above) flashed with the STK500v2 emulation firmware. This allows me to use avr-gcc with AVR Studio to program the chip.<\/p>\n

Here is some code I used to test the displays, using PORTD for data lines, and the 2 LSB’s of PORTC for digit select lines. This is the first time I’ve worked with AVRs outside of the Arduino environment, so pardon any flagrant errors and drop me a comment if you have any suggestions.<\/p>\n

\r\n#define F_CPU 1000000UL\r\n\r\n#include <avr\/io.h>\r\n#include <util\/delay.h>\r\n#include <string.h>\r\n#include <stdlib.h>\r\n\r\nvoid wr();\r\nvoid wrChar(char toWrite, int dig);\r\nvoid wrWord(char *word);\r\nvoid scrollWord(char *word);\r\nvoid delay_ms(uint16_t ms);\r\n\r\nint main (void){\r\n  DDRC=0xFF;\r\n  DDRD=0xFF;\r\n  PORTD=0x00;\r\n  PORTC=0x00;\r\n\r\n  \/\/ Loop through a few strings for testing\r\n  while(1){\r\n    wrWord("Helo");\r\n    delay_ms(500);\r\n    wrWord("*?%$");\r\n    delay_ms(500);\r\n  }\r\n}\r\n\r\n\/\/ Toggle write pin (PC0)\r\nvoid wr() {\r\n  PORTD &= ~(1<<7);\r\n  delay_ms(1);\r\n  PORTD |= (1<<7);\r\n}\r\n\r\n\/\/ Write char to position\r\nvoid wrChar(char toWrite, int pos){\r\n  PORTC = pos;  \/\/ Set digit select lines\r\n  PORTD = toWrite;  \/\/ Set data lines\r\n  wr();  \/\/ Toggle write pin\r\n}\r\n\r\n\/\/ Write 4-char word\r\nvoid wrWord(char *word){\r\n  for(int i=3; i>=0; i--){\r\n    wrChar(word[i], 3-i);\r\n  }\r\n}\r\n\r\n\/\/ Generic delay function\r\nvoid delay_ms(uint16_t ms) {\r\n  while (ms) {\r\n    _delay_ms(1);\r\n    ms--;\r\n  }\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
I happened to scavenge a couple of SLG2016’s from some old workstation debug displays. After finally locating a datasheet, I realized that they used the standard ASCII charset, so they are extremely easy to drive. Note: The SLG2016 differs from…<\/span><\/p>\n
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