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PCD
Non-RAM Data Definitions
CCS C compiler also provides a custom qualifier addressmod which can
be used to define a memory region that can be RAM, program eeprom,
data eeprom or external memory. Addressmod replaces the older
typemod (with a different syntax).
The usage is :
addressmod
(name,read_function,write_function,start_address,end_address,
share);
Where the read_function and write_function should be blank for RAM, or
for other memory should be the following prototype:
// read procedure for reading n bytes from the memory starting at
location addr
void read_function(int32 addr,int8 *ram, int nbytes) {
}
//write procedure for writing n bytes to the memory starting at
location addr
void write_function(int32 addr,int8 *ram, int nbytes){
}
For RAM the share argument may be true if unused RAM in this area can be used by the
compiler for standard variables.
Example:
void DataEE_Read(int32 addr, int8 * ram, int bytes) {
int i;
for(i=0;i<bytes;i++,ram++,addr++)
*ram=read_eeprom(addr);
}
void DataEE_Write(int32 addr, int8 * ram, int bytes) {
int i;
for(i=0;i<bytes;i++,ram++,addr++)
write_eeprom(addr,*ram);
}
addressmod (DataEE,DataEE_read,DataEE_write,5,0xff);
// would define a region called DataEE between
// 0x5 and 0xff in the chip data EEprom.
void main (void)
{
int DataEE test;
int x,y;
x=12;
test=x;
y=test;
// writes x to the Data EEPROM
// Reads the Data EEPROM
}
Note: If the area is defined in RAM then read and write functions are not
required, the variables assigned in the memory region defined by the
addressmod can be treated as a regular variable in all valid expressions.
Any structure or data type can be used with an addressmod. Pointers
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