// The manufacturer and device id command (0x9F) returns 4 bytes normally
// (including info on id, family, density, etc.), but this functions returns
// only the 5 bits pertaining to the memory density.
unsigned char dfmemGetChipSize (void)
{
unsigned char byte;
dfmemSelectChip();
dfmemWriteByte(0x9F);
byte = dfmemReadByte(); // Manufacturer ID, not needed
byte = dfmemReadByte() & 0b00011111;
dfmemDeselectChip();
return byte;
}
void dfmemRead (unsigned int page, unsigned int byte, unsigned int length,
unsigned char *data)
{
while(!dfmemIsReady());
// Restructure page/byte addressing
// 1 don't care bit + 13 page address bits + byte address bits
MemAddr.address = (((unsigned long)page) << dfmem_byte_address_bits) + byte;
// Read data from memory
dfmemSelectChip();
dfmemWriteByte(READ_PAGE);
dfmemWriteByte(MemAddr.chr_addr[2]);
dfmemWriteByte(MemAddr.chr_addr[1]);
dfmemWriteByte(MemAddr.chr_addr[0]);
dfmemWriteByte(0x00); // 4 don't care bytes
dfmemWriteByte(0x00);
dfmemWriteByte(0x00);
dfmemWriteByte(0x00);
while (length--) { *data++ = dfmemReadByte(); }
dfmemDeselectChip();
}
// The manufacturer and device id command (0x9F) returns 4 bytes normally
// (including info on id, family, density, etc.), but this functions returns
// just the manufacturer id and discards the rest when de-selecting the chip.
unsigned char dfmemGetManufacturerID (void)
{
unsigned char byte;
dfmemSelectChip();
dfmemWriteByte(0x9F);
byte = dfmemReadByte();
dfmemDeselectChip();
return byte;
}
unsigned char dfmemGetStatus (void)
{
unsigned char byte;
dfmemSelectChip();
dfmemWriteByte(0xD7);
byte = dfmemReadByte();
dfmemDeselectChip();
return byte;
}
