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180 lines (160 loc) · 3.53 KB
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//
// FILE: FRAM.cpp
// AUTHOR: Rob Tillaart
// VERSION: 0.1.0
// PURPOSE: Class for FRAM memory
// URL:
//
// HISTORY:
// 0.1.0 initial version
//
#include "FRAM.h"
#define FRAM_SLAVE_ID_ 0x7C
/////////////////////////////////////////////////////
//
// PUBLIC
//
FRAM::FRAM()
{}
int FRAM::begin(int address = 0X50)
{
if (address < 0x50 || address > 0x57)
{
return FRAM_ERROR_ADDR;
}
_address = address;
Wire.begin();
uint16_t mid = getManufacturerID();
uint16_t pid = getProductID();
_size = 0; // UNKNOWN
if (mid == 0x000A) // fujitsu
{
// note pid's are from fujitsu SIZE TYPE
if (pid == 0x0510) _size = 32; // 32KB MB85RC256V
if (pid == 0x0658) _size = 64; // 64KB MB85RC512T
if (pid == 0x0758) _size = 128; // 128KB MB85RC1MT
}
return FRAM_OK;
}
void FRAM::write8(uint16_t memaddr, uint8_t value)
{
uint8_t val = value;
writeBlock(memaddr, (uint8_t *)&val, 1);
}
void FRAM::write16(uint16_t memaddr, uint16_t value)
{
uint16_t val = value;
writeBlock(memaddr, (uint8_t *)&val, 2);
}
void FRAM::write32(uint16_t memaddr, uint32_t value)
{
uint32_t val = value;
writeBlock(memaddr, (uint8_t *)&val, 4);
}
void FRAM::write(uint16_t memaddr, uint8_t * obj, uint16_t size)
{
const int blocksize = 24;
uint8_t * p = obj;
while (size >= blocksize)
{
writeBlock(memaddr, p, blocksize);
memaddr += blocksize;
p += blocksize;
size -= blocksize;
}
// remaining
if (size > 0)
{
writeBlock(memaddr, p, size);
}
}
uint8_t FRAM::read8(uint16_t memaddr)
{
uint8_t val;
readBlock(memaddr, (uint8_t *)&val, 1);
return val;
}
uint16_t FRAM::read16(uint16_t memaddr)
{
uint16_t val;
readBlock(memaddr, (uint8_t *)&val, 2);
return val;
}
uint32_t FRAM::read32(uint16_t memaddr)
{
uint32_t val;
readBlock(memaddr, (uint8_t *)&val, 4);
return val;
}
void FRAM::read(uint16_t memaddr, uint8_t * obj, uint16_t size)
{
const int blocksize = 24;
uint8_t * p = obj;
while (size >= blocksize)
{
readBlock(memaddr, p, blocksize);
memaddr += blocksize;
p += blocksize;
size -= blocksize;
}
if (size > 0)
{
readBlock(memaddr, p, size);
}
}
uint16_t FRAM::getManufacturerID()
{
uint16_t value = 0;
Wire.beginTransmission(FRAM_SLAVE_ID_);
Wire.write(_address << 1);
Wire.endTransmission(false);
int x = Wire.requestFrom(FRAM_SLAVE_ID_, 2);
if (x != 2) return -1;
value = Wire.read() << 4;
value |= Wire.read() >> 4;
return value;
}
uint16_t FRAM::getProductID()
{
uint16_t value = 0;
Wire.beginTransmission(FRAM_SLAVE_ID_);
Wire.write(_address << 1);
Wire.endTransmission(false);
int x = Wire.requestFrom(FRAM_SLAVE_ID_, 3);
if (x != 3) return -1;
Wire.read();
value = (Wire.read() & 0x0F) << 8;
value |= Wire.read();
return value;
}
///////////////////////////////////////////////////////////
//
// PRIVATE
//
void FRAM::writeBlock(uint16_t memaddr, uint8_t * obj, uint16_t size)
{
// TODO constrain size < 30 ??
Wire.beginTransmission(_address);
Wire.write(memaddr >> 8);
Wire.write(memaddr & 0xFF);
uint8_t * p = obj;
for (uint8_t i = 0; i < size; i++)
{
Wire.write(*p++);
}
Wire.endTransmission();
}
void FRAM::readBlock(uint16_t memaddr, uint8_t * obj, uint16_t size)
{
Wire.beginTransmission(_address);
Wire.write(memaddr >> 8);
Wire.write(memaddr & 0xFF);
Wire.endTransmission();
Wire.requestFrom(_address, size);
uint8_t * p = obj;
for (uint8_t i = 0; i < size; i++)
{
*p++ = Wire.read();
}
}
// END OF FILE