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I2CEEProm.cpp
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I2CEEProm.cpp
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/*
* I2CEEProm.cpp
*
* Created on: Feb 13, 2018
* Author: jock
*/
#include <I2CEEProm.h>
int16_t I2CEEProm::writeByte(uint16_t addr, uint8_t val)
{
uint8_t buf[3];
buf[0] = addr >> 8;
buf[1] = addr & 0xFF;
buf[2] = val;
int stat = this->i2c->write(this->i2cAddr, (const char *)buf, 3);
wait_ms(6);
int16_t ret = stat ? -1 : 0;
return ret;
}
int16_t I2CEEProm::readByte(uint16_t addr)
{
uint8_t buf[2];
buf[0] = addr >> 8;
buf[1] = addr & 0xFF;
this->i2c->write(this->i2cAddr, (const char *)buf, 2);
wait_ms(6);
int stat = this->i2c->read(this->i2cAddr, (char *) buf, 1);
wait_ms(6);
int16_t ret = stat ? -1 : buf[0];
return ret;
}
uint16_t I2CEEProm::read(uint16_t addr, uint8_t *buf, uint16_t size)
{
uint16_t ret = 0;
uint8_t aBuf[2];
int stat = 0;
uint8_t *bufAddr = buf;
aBuf[0] = addr >> 8;
aBuf[1] = addr & 0xFF;
this->i2c->write(this->i2cAddr, (const char *)aBuf, 2);
static const int16_t chunkSize = 16;
int16_t chunkCount = size / chunkSize;
int16_t lastChunkSize = size % chunkSize;
for(uint16_t i = 0; i < chunkCount; ++i) {
stat = this->i2c->read(this->i2cAddr, (char *) bufAddr, chunkSize);
if(stat) {
break;
}
ret += chunkSize;
bufAddr += chunkSize;
}
if(!stat && lastChunkSize > 0) {
stat = this->i2c->read(this->i2cAddr, (char *) bufAddr, lastChunkSize);
if(!stat) {
ret += chunkSize;
}
}
return ret;
}