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//MiniDrv -- minimalistic driver firmware (no blinkies) -- DrJones 2014
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#define F_CPU 4800000 //use fuses low:0x75 high:0xff
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#include <util/delay.h>
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//change modes here; just change/add/delete values
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uint8_t modes[]={8,90,255}; //PWM values, 5..255
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DDRB=2; //define PB1 as output
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TCCR0A=0b00100001; TCCR0B=0b00000001; //PWM setup, 9kHz
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EEARL=4;EECR=1; uint8_t mode=EEDR; //read from EEPROM
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if (mode>=sizeof(modes)) mode=0; //check if invalid
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OCR0B=modes[mode]; //set PWM level
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EEDR=mode+1; //next mode
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if(EEDR>=sizeof(modes)) EEDR=0;
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EECR=4;EECR=4+2; while(EECR&2); //write to EEPROM
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_delay_ms(1000); //delay for memory (or nomemory) to kick in
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EEDR=mode; //memory: use this mode again \ use one of these lines
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//EEDR=0; //no memory: restart from 0 / use one of these lines
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EECR=4;EECR=4+2; while(EECR&2); //write to EEPROM
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while(1) {} //endless loop
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DrJones/MiniDrv/MiniDrv.c
