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PCD
///
///
eeprom_di, eeprom_do and eeprom_clk to override
the defaults below.
///
///
/////////////////////////////////////////////////////////////////
#ifndef EEPROM_SELECT
#define
#define
#define
#define
EEPROM_SELECT
EEPROM_CLK
EEPROM_DI
EEPROM_DO
PIN_B7
PIN_B6
PIN_B5
PIN_B4
#endif
#define EEPROM_ADDRESS byte
#define EEPROM_SIZE
256
void init_ext_eeprom () {
byte cmd[2];
byte i;
output_low(EEPROM_DI);
output_low(EEPROM_CLK);
output_low(EEPROM_SELECT);
cmd[0]=0x80;
cmd[1]=0x9;
for (i=1; i<=4; ++i)
shift_left(cmd, 2,0);
output_high (EEPROM_SELECT);
for (i=1; i<=12; ++i)
{
output_bit(EEPROM_DI, shift_left(cmd, 2,0));
output_high (EEPROM_CLK);
output_low(EEPROM_CLK);
}
output_low(EEPROM_DI);
output_low(EEPROM_SELECT);
}
void write_ext_eeprom (EEPROM_ADDRESS address, byte data)
byte cmd[3];
byte i;
cmd[0]=data;
cmd[1]=address;
cmd[2]=0xa;
for(i=1;i<=4;++i)
shift_left(cmd,3,0);
output_high(EEPROM_SELECT);
for(i=1;i<=20;++i) {
output_bit (EEPROM_DI, shift_left (cmd,3,0));
output_high (EEPROM_CLK);
output_low(EEPROM_CLK);
}
output_low (EEPROM_DI);
output_low (EEPROM_SELECT);
356
{
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