1 /*-------------------------------------------------------------------------
3 device.c - Accomodates subtle variations in PIC devices
4 Written By - Scott Dattalo scott@dattalo.com
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 -------------------------------------------------------------------------*/
22 PIC device abstraction
24 There are dozens of variations of PIC microcontrollers. This include
25 file attempts to abstract those differences so that SDCC can easily
32 /* memRange - a structure to define a range of valid memory addresses
34 * The Memory of most PICs (and other micros) is a collection of
35 * disjoint chunks. The memRange structure will define the start
36 * and end address of one of these chunks. The memory map of a
37 * particular device is a collection of memRange struct's.
40 typedef struct memRange {
41 int start_address; /* first address in range */
42 int end_address; /* last */
43 int alias; /* bit mask defining how/if memory range is aliased
44 * e.g. alias = 0x80 means start_address is identical
45 * to the memory location at (0x80 | start_address) */
46 int bank; /* PIC memory bank this range occupies */
47 struct memRange *next; /* linked list */
51 /* Processor unique attributes */
52 typedef struct PIC_device {
53 char *name; /* the processor name */
55 memRange *ram; /* RAM memory map */
56 memRange *sfr; /* SFR memory map */
58 int maxRAMaddress; /* maximum value for a data address */
59 int defMaxRAMaddrs; /* default maximum value for a data address */
60 int bankMask; /* Bitmask that is ANDed with address to extract banking bits */
61 // int hasAliasedRAM:1; /* True if there are bank independent registers */
62 int hasSecondConfigReg; /* True if there is a second configuration register */
64 int programMemSize; /* program memory size in words - for device listing only */
65 int dataMemSize; /* data (RAM) memory size in bytes - for device listing only */
66 int eepromMemSize; /* EEPROM memory size in bytes - for device listing only */
67 int ioPins; /* number of I/O pins - for device listing only */
71 /* Given a pointer to a register, this macro returns the bank that it is in */
72 #define REG_ADDR(r) ((r)->isBitField ? (((r)->address)>>3) : (r)->address)
75 /****************************************/
76 void assignConfigWordValue(int address, int value);
77 int getConfigWord(int address);
78 int isREGinBank(regs *reg, int bank);
79 int REGallBanks(regs *reg);
80 void addMemRange(memRange *r, int type);
81 void setMaxRAM(int size);
82 void setDefMaxRam(void);
84 void pic14_assignConfigWordValue(int address, int value);
85 int pic14_emitConfigWord (FILE * vFile);
86 int pic14_getConfigWord(int address);
88 unsigned pic14_getMaxRam(void);
89 int pic14_getHasSecondConfigReg(void);
90 int pic14_allRAMShared(void);
91 int pic14_hasSharebank(int *low, int *high, int *size);
92 int pic14_getSharedStack(int *low, int *high, int *size);
93 PIC_device * pic14_getPIC(void);
95 #endif /* __DEVICE_H__ */