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nurquhar
Joined: 05 Aug 2006
Posts: 149
Location: Redditch, UK
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| How to read_configuration_memory() with PCM ? |
 Posted: Thu Jul 21, 2011 8:38 am |
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CCS PCM C Compiler, Version 4.122
The CCS help suggests the read_configuration_memory() function will only work with pic18s and does not work on pic16s. Fair enough, indeed you get a compiler error if you try.
However the 12F1822 has the ability to read/writes its User ID's config memory (8000h->8003h) according to the data sheet.
Is there a CCS way to read/write the user id on the 12F1822 
I tried setting it with ID Memory feature of MPLAB and reading back on the pic with read_program_memory() but that does not seem to work. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Jul 22, 2011 4:42 pm |
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Look in the CCS manual at this function:
| Quote: |
read_configuration_memory( )
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I haven't tested this. |
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nurquhar
Joined: 05 Aug 2006
Posts: 149
Location: Redditch, UK
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| Posted: Sat Jul 23, 2011 12:25 am |
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I tried read_configuration_memory(), but compiler refused it. The manual says its only for PIC18's. I have the PIC12F1822.
I did also just try read_program_eeprom() address 0x8000 but that did not work either. Looking at the .lst file and section 11.5 of parts datasheet it seems CFGS has to be set in EECON1 (bit6). And CCS (PCM) is not doing that. Are we missing a feature from CCS ?
I guess I will have to hunt out a Flash read/write procedure and modifiy it to set the CFGS flag as required. Got any recommemndations for a nice CCS procedure with inline #ASM ? |
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nurquhar
Joined: 05 Aug 2006
Posts: 149
Location: Redditch, UK
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| Posted: Sat Jul 23, 2011 2:32 am |
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I just whipped this up using CCS after referencing the 12F1822 datasheet section 11.5 and it seems to work. Except in my test prog my printf is putting out <0> instead the string I had coded. I will have to look at this as I am concerned that my read procedure could be corrupting something 
| Code: | #ifndef _CONFIGMEM_H
#define _CONFIGMEM_H
#byte EEADRL = getenv("SFR:EEADRL")
#byte EEADRH = getenv("SFR:EEADRH")
#byte EEDATL = getenv("SFR:EEDATL")
#byte EEDATH = getenv("SFR:EEDATH")
#byte EECON1 = getenv("SFR:EECON1")
#bit CFGS = getenv("bit:CFGS")
#bit RD = getenv("bit:RD")
#byte EECON2 = getenv("SFR:EECON2")
#byte INTCON = getenv("SFR:INTCON")
#bit GIE = getenv("bit:GIE")
// Read config memory, address is an offeset to the 0x8000 base in the PIC
uint8 read_config_memory(uint8 address)
{
int1 ie ;
ie = GIE ;
EEADRL = address ;
EEADRH = 0 ;
CFGS = 1 ;
GIE = 0 ;
RD = 1 ;
#asm
nop
nop
#endasm
GIE = ie ;
return(EEDATL) ;
}
#endif
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nurquhar
Joined: 05 Aug 2006
Posts: 149
Location: Redditch, UK
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| Posted: Tue Jul 26, 2011 5:43 am |
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CCS does seem to have any functions to read/write the config memory for the 12F1822, 16F1823, 12F1840 etc .
I have just test this set of functions on the PIC12F1822 and all seems well.
enjoy .....
| Code: | #ifndef _CONFIGMEM_H
#define _CONFIGMEM_H
#byte EEADRL = getenv("SFR:EEADRL")
#byte EEADRH = getenv("SFR:EEADRH")
#byte EEDATL = getenv("SFR:EEDATL")
#byte EEDATH = getenv("SFR:EEDATH")
#byte EECON1 = getenv("SFR:EECON1")
#bit EEPGD = getenv("bit:EEPGD")
#bit CFGS = getenv("bit:CFGS")
#bit LWLO = getenv("bit:LWLO")
#bit FREE = getenv("bit:FREE")
#bit WRERR = getenv("bit:WRERR")
#bit WREN = getenv("bit:WREN")
#bit RD = getenv("bit:RD")
#bit WR = getenv("bit:WR")
#byte EECON2 = getenv("SFR:EECON2")
#byte INTCON = getenv("SFR:INTCON")
#bit GIE = getenv("bit:GIE")
// Read config memory, address is an offeset to the 0x8000 base
// .... User ID values are 12 bit values
uint16 read_config_memory(uint8 address)
{
int1 ie ;
EEADRL = address ;
EEADRH = 0 ;
ie = GIE ;
CFGS = 1 ;
GIE = 0 ;
RD = 1 ;
#asm
nop
nop
#endasm
CFGS = 0 ;
GIE = ie ;
return(make16(EEDATH,EEDATL)) ;
}
// Write the USER ID memory locations 8000-8003, all other locations are R/O
// ... Clear all user id's locations first with earse_config_memory()
void write_config_memory(uint8 address, uint16 val)
{
int1 ie ;
EEDATL = make8(val,0) ;
EEDATH = make8(val,1) ;
EEADRL = address ;
EEADRH = 0 ;
ie = GIE ;
FREE = 0 ;
CFGS = 1 ;
WREN = 1 ;
GIE = 0 ;
EECON2 = 0x55 ;
EECON2 = 0xAA ;
WR = 1 ;
while(WR == 1) ;
WREN = 0 ;
CFGS = 0 ;
GIE = ie ;
}
// Erase the USER ID memory locations 8000-8003, all other locations are R/O
void erase_config_memory()
{
int1 ie ;
EEDATL = 0 ;
ie = GIE ;
EEADRL = 0 ;
EEADRH = 0 ;
FREE = 1 ;
CFGS = 1 ;
WREN = 1 ;
GIE = 0 ;
EECON2 = 0x55 ;
EECON2 = 0xAA ;
WR = 1 ;
while(WR == 1) ;
WREN = 0 ;
CFGS = 0 ;
GIE = ie ;
}
#endif
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