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https://github.com/Kugelschieber/arduino-c.git
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64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
#include <util/delay.h>
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#include "at28c256.h"
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#include "../ard/pins.h"
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unsigned char _ck, _addr, _oe, _we, _io0, _io1, _io2, _io3, _io4, _io5, _io6, _io7;
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void at28c256_init(unsigned char ck, unsigned char addr, unsigned char oe, unsigned char we, unsigned char io0, unsigned char io1, unsigned char io2, unsigned char io3, unsigned char io4, unsigned char io5, unsigned char io6, unsigned char io7) {
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pin_mode(ck, OUTPUT);
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digital_write(ck, LOW); // disable
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pin_mode(addr, OUTPUT);
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digital_write(addr, LOW); // disable
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pin_mode(oe, OUTPUT);
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digital_write(oe, HIGH); // disable
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pin_mode(we, OUTPUT);
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digital_write(we, HIGH); // disable
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_ck = ck;
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_addr = addr;
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_oe = oe;
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_we = we;
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_io0 = io0;
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_io1 = io1;
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_io2 = io2;
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_io3 = io3;
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_io4 = io4;
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_io5 = io5;
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_io6 = io6;
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_io7 = io7;
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}
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void at28c256_write(unsigned short addr, unsigned char data) {
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// just to be safe, disable output
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digital_write(_oe, HIGH);
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// set the address
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unsigned int i;
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for(i = 0; i < 16; i++) {
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if(addr & (1 << (15-i))) {
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digital_write(_addr, HIGH);
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} else {
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digital_write(_addr, LOW);
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}
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digital_write(_ck, HIGH);
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digital_write(_ck, LOW);
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}
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digital_write(_addr, LOW);
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// write data
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digital_write(_io0, data & 1);
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digital_write(_io1, data & 1<<1);
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digital_write(_io2, data & 1<<2);
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digital_write(_io3, data & 1<<3);
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digital_write(_io4, data & 1<<4);
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digital_write(_io5, data & 1<<5);
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digital_write(_io6, data & 1<<6);
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digital_write(_io7, data & 1<<7);
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digital_write(_we, data);
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_delay_us(1); // min 100ns
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digital_write(_we, HIGH);
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}
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