void sysRead(uint8_t *dest, uint16_t addr, uint16_t count)
{
uint8_t oldRFIE = RFIE;
uint16_t PageCounter = 0;
RFIE = 0;
do
{
EES_nCS = 0;
MacroNop();
EESPIPut(SPI_RD_STATUS);
PageCounter = EESPIGet();
EES_nCS = 1;
MacroNop();
}
while(PageCounter & 0x01 );
EES_nCS = 0;
EESPIPut(SPI_READ);
EESPIPut(0x01); // allow system settings for second bank
EESPIPut(addr >> 8);
EESPIPut(addr);
while( count > 0 )
{
*dest++ = EESPIGet();
count--;
}
EES_nCS = 1;
RFIE = oldRFIE;
}
void spieepromWrite(uint8_t *source, uint16_t addr, uint16_t count) {
uint8_t statusReg = 0;
uint8_t oldGIE = INTCONbits.GIE;
INTCONbits.GIE = 0;
EEPROM_NEXT_PAGE:
do {
EE_nCS = 0;
EESPIPut(SPI_RDSR);
statusReg = EESPIGet();
EE_nCS = 1;
Nop();
} while (statusReg & 0x01);
EE_nCS = 0;
EESPIPut(SPI_WREN);
EE_nCS = 1;
Nop();
EE_nCS = 0;
#if MCHP_EEPROM < MCHP_4KBIT
EESPIPut(SPI_WRITE);
EESPIPut(addr);
#elif MCHP_EEPROM == MCHP_4KBIT
if (addr > 0xFF) {
EESPIPut(SPI_WRITE | 0x08);
} else {
EESPIPut(SPI_WRITE);
}
EESPIPut(addr);
#elif MCHP_EEPROM < MCHP_1MBIT
EESPIPut(SPI_WRITE);
EESPIPut(addr >> 8);
EESPIPut(addr);
#endif
statusReg = 0;
while (count > 0) {
EESPIPut(*source++);
count--;
statusReg++;
if (((addr + statusReg) & (NVM_PAGE_SIZE - 1)) == 0) {
EE_nCS = 1;
addr += statusReg;
goto EEPROM_NEXT_PAGE;
}
}
EE_nCS = 1;
Nop();
// waiting for write finish
do {
EE_nCS = 0;
EESPIPut(SPI_RDSR);
statusReg = EESPIGet();
EE_nCS = 1;
Nop();
} while (statusReg & 0x01);
INTCONbits.GIE = oldGIE;
}
void spieepromRead(uint8_t *dest, uint16_t addr, uint16_t count) {
uint8_t oldGIEH = INTCONbits.GIE;
INTCONbits.GIE = 0;
EE_nCS = 0;
#if MCHP_EEPROM < MCHP_4KBIT
EESPIPut(SPI_READ);
EESPIPut(addr);
#elif MCHP_EEPROM == MCHP_4KBIT
if (addr > 0xFF) {
EESPIPut(SPI_READ | 0x08);
} else {
EESPIPut(SPI_READ);
}
EESPIPut(addr);
#elif MCHP_EEPROM < MCHP_1MBIT
EESPIPut(SPI_READ);
EESPIPut(addr >> 8);
EESPIPut(addr);
#endif
while (count > 0) {
*dest++ = EESPIGet();
count--;
}
EE_nCS = 1;
INTCONbits.GIE = oldGIEH;
}
uint16_t sysDiff(uint8_t *dest, uint16_t addr, uint16_t count)
{
uint8_t oldRFIE = RFIE;
RFIE = 0;
EES_nCS = 0;
EESPIPut(SPI_READ);
EESPIPut(0x01); // allow system settings for second bank
EESPIPut(addr >> 8);
EESPIPut(addr);
while( count > 0 )
{
if(*dest++ != EESPIGet())
{
EES_nCS = 1;
RFIE = oldRFIE;
return (count&0xFF);
}
count--;
}
EES_nCS = 1;
RFIE = oldRFIE;
return 0;
}
void sysErase()
{
uint32_t addr = 0;
uint32_t count = 0x20000;
uint16_t PageCounter = 0;
uint8_t oldRFIE = RFIE;
RFIE = 0;
EEPROM_NEXT_PAGE:
do
{
EES_nCS = 0;
MacroNop();
EESPIPut(SPI_RD_STATUS);
PageCounter = EESPIGet();
EES_nCS = 1;
MacroNop();
}
while(PageCounter & 0x01 );
EES_nCS = 0;
MacroNop();
EESPIPut(SPI_EN_WRT);
EES_nCS = 1;
MacroNop();
EES_nCS = 0;
MacroNop();
EESPIPut(SPI_WRITE);
EESPIPut(addr >> 16); // allow system settings for second bank
EESPIPut(addr >> 8);
EESPIPut(addr);
PageCounter = 0;
while( count > 0 )
{
EESPIPut(0xFF);
count--;
PageCounter++;
if( ((addr + PageCounter) & (NVM_PAGE_SIZE-1)) == 0 )
{
EES_nCS = 1;
addr += PageCounter;
goto EEPROM_NEXT_PAGE;
}
}
EES_nCS = 1;
RFIE = oldRFIE;
}
/*********************************************************************
* Function: void NVMRead(BYTE *dest, BYTE addr, BYTE count)
*
* PreCondition: SPI port has been initialized
*
* Input: dest - pointer to the buffer to hold the read data
* addr - starting address for the read
* count - total number of bytes to be read
*
* Output: none
*
* Side Effects: none
*
* Overview: This function will read count byte of data starting
* from address addr, and store the read data to the
* buffer starting from *dest.
*
* Note: None
********************************************************************/
void NVMRead(BYTE *dest, WORD addr, WORD count)
{
#if defined(__18CXX)
BYTE oldGIEH = INTCONbits.GIEH;
INTCONbits.GIEH = 0;
#else
BYTE oldRFIE = RFIE;
RFIE = 0;
#endif
EE_nCS = 0;
#if MCHP_EEPROM < MCHP_4KBIT
EESPIPut(SPI_READ);
EESPIPut(addr);
#elif MCHP_EEPROM == MCHP_4KBIT
if( addr > 0xFF )
{
EESPIPut(SPI_READ | 0x08);
}
else
{
EESPIPut(SPI_READ);
}
EESPIPut(addr);
#elif MCHP_EEPROM < MCHP_1MBIT
EESPIPut(SPI_READ);
EESPIPut(addr>>8);
EESPIPut(addr);
#endif
while( count > 0 )
{
*dest++ = EESPIGet();
count--;
}
EE_nCS = 1;
#if defined(__18CXX)
INTCONbits.GIEH = oldGIEH;
#else
RFIE = oldRFIE;
#endif
}
void NVMRead(uint8_t *dest, uint16_t addr, uint16_t count)
{
uint8_t oldRFIE = RFIE;
RFIE = 0;
EES_nCS = 0;
EESPIPut(SPI_READ);
EESPIPut(0x00); // allow MIWI for first bank
EESPIPut(addr >> 8);
EESPIPut(addr);
while( count > 0 )
{
*dest++ = EESPIGet();
count--;
}
EES_nCS = 1;
RFIE = oldRFIE;
}
void NVMWrite(BYTE *source, WORD addr, WORD count)
{
BYTE PageCounter = 0;
//BYTE i;
#if defined(__18CXX)
BYTE oldGIEH = INTCONbits.GIEH;
INTCONbits.GIEH = 0;
#else
BYTE oldRFIE = RFIE;
RFIE = 0;
#endif
EEPROM_NEXT_PAGE:
do
{
EE_nCS = 0;
EESPIPut(SPI_RD_STATUS);
PageCounter = EESPIGet();
EE_nCS = 1;
MacroNop();
} while(PageCounter & 0x01 );
EE_nCS = 0;
EESPIPut(SPI_EN_WRT);
EE_nCS = 1;
MacroNop();
EE_nCS = 0;
#if MCHP_EEPROM < MCHP_4KBIT
EESPIPut(SPI_WRITE);
EESPIPut(addr);
#elif MCHP_EEPROM == MCHP_4KBIT
if( addr > 0xFF )
{
EESPIPut(SPI_WRITE | 0x08);
}
else
{
EESPIPut(SPI_WRITE);
}
EESPIPut(addr);
#elif MCHP_EEPROM < MCHP_1MBIT
EESPIPut(SPI_WRITE);
EESPIPut(addr>>8);
EESPIPut(addr);
#endif
PageCounter = 0;
while( count > 0 )
{
EESPIPut(*source++);
count--;
PageCounter++;
if( ((addr + PageCounter) & (NVM_PAGE_SIZE-1)) == 0 )
{
EE_nCS = 1;
addr += PageCounter;
goto EEPROM_NEXT_PAGE;
}
}
EE_nCS = 1;
#if defined(__18CXX)
INTCONbits.GIEH = oldGIEH;
#else
RFIE = oldRFIE;
#endif
}
