77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
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//EEPPROM compatibility support for simulator
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define EEPROM_SIZE 1024
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static FILE * fp;
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static uint8_t eemem[EEPROM_SIZE];
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static uint8_t inited;
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static void init(){
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if(!inited){
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inited = 1;
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char* filename = ".simulated_eeprom.bin";
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size_t size;
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fp = fopen(filename, "r+");
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if(fp == 0){
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fp = fopen(filename, "w+");
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if(fp == 0){
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printf("Failed to open %s\n",filename );
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exit (1);
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}
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}
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size = fread (eemem, 1, EEPROM_SIZE, fp);
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if(size < EEPROM_SIZE){
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memset(eemem, 0xff, EEPROM_SIZE);
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}
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}
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}
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extern uint8_t _eeprom_start__[];
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uint16_t conv_addr(uint8_t * p){
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uint16_t addr;
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addr = (unsigned int)p - (unsigned int)_eeprom_start__;
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if(addr >= EEPROM_SIZE){
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printf ("warning: eeprom write to %X\n",addr);
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}
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addr &= (EEPROM_SIZE-1);
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return addr;
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}
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void eeprom_write_byte (uint8_t *p, uint8_t value){
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printf("sim eeprom write [%04X]=%02X\n", conv_addr(p), value);
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init();
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eemem[conv_addr(p)] = value;
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fseek(fp, 0, SEEK_SET);
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fwrite(eemem, 1, EEPROM_SIZE, fp);
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}
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void eeprom_write_word (uint16_t *p, uint16_t value){
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printf("sim eeprom write [%04X]=%04X\n", conv_addr(p), value);
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init();
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eemem[conv_addr((uint8_t*)p) ] = value & 0xff;
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eemem[conv_addr((uint8_t*)p)+1] = value >> 8;
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fseek(fp, 0, SEEK_SET);
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fwrite(eemem, 1, EEPROM_SIZE, fp);
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fflush(fp);
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}
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uint8_t eeprom_read_byte (uint8_t *p){
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init();
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return eemem[conv_addr(p)];
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}
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uint16_t eeprom_read_word (uint16_t *p){
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init();
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return eemem[conv_addr((uint8_t*)p)] | (eemem[conv_addr((uint8_t*)p)+1]<<8);
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}
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