1 /*-------------------------------------------------------------------------
3 device.c - Accomodates subtle variations in PIC16 devices
5 Written By - Scott Dattalo scott@dattalo.com
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 -------------------------------------------------------------------------*/
23 PIC device abstraction
25 There are dozens of variations of PIC microcontrollers. This include
26 file attempts to abstract those differences so that SDCC can easily
33 /* memRange - a structure to define a range of valid memory addresses
35 * The Memory of most PICs (and other micros) is a collection of
36 * disjoint chunks. The memRange structure will define the start
37 * and end address of one of these chunks. The memory map of a
38 * particular device is a collection of memRange struct's.
41 typedef struct memRange {
42 int start_address; /* first address in range */
43 int end_address; /* last */
44 int alias; /* bit mask defining how/if memory range is aliased
45 * e.g. alias = 0x80 means start_address is identical
46 * to the memory location at (0x80 | start_address) */
47 int bank; /* PIC memory bank this range occupies */
51 /* AssignedMemory - A structure to keep track of the memory that has been used.
53 * When a register gets assigned an address this struct is used to
54 * keep track of a few details about the register. There is one of
55 * these structures for each memory location in the device.
58 typedef struct AssignedMemory {
59 regs *reg; /* Pointer to the register (NULL if this is an invalid address) */
60 int instance; /* the i'th byte of a multibyte register */
61 int alias; /* Bit mapping of aliased addresses (see memRange) */
62 int bank; /* Memory bank of this register */
63 int isValid:1; /* True if the address is legal */
64 int isSFR:1; /* True if the address is that of a Special Function reg */
65 int isEmitted:1; /* True if the register has been written to a cBlock */
71 * pic16_finalMapping - Dynamically allocated array that records the register assignments
74 extern AssignedMemory *pic16_finalMapping;
77 * pic16_finalMappingSize - Size of register assignments that pic16_finalMapping can hold
80 extern int pic16_finalMappingSize;
83 #define PROCESSOR_NAMES 4
84 /* Processor unique attributes */
85 typedef struct PIC_device {
86 char *name[PROCESSOR_NAMES];/* aliases for the processor name */
88 memRange *ram; /* RAM memory map */
89 memRange *sfr; /* SFR memory map */
91 int maxRAMaddress; /* maximum value for a data address */
92 int bankMask; /* Bitmask that is ANDed with address to extract banking bits */
93 int RAMsize; /* size of Data RAM - VR 031120 */
94 int extMIface; /* device has external memory interface */
97 /* Given a pointer to a register, this macro returns the bank that it is in */
98 #define REG_ADDR(r) ((r)->isBitField ? (((r)->address)>>3) : (r)->address)
99 #define REG_BANK(r) (pic16_finalMapping[REG_ADDR(r)].bank)
100 #define REG_isALIASED(r) (pic16_finalMapping[REG_ADDR(r)].alias != 0)
101 #define REG_isVALID(r) (pic16_finalMapping[REG_ADDR(r)].isValid)
104 /****************************************/
105 void pic16_assignConfigWordValue(int address, int value);
106 int pic16_getConfigWord(int address);
107 int pic16_isREGinBank(regs *reg, int bank);
108 int pic16_REGallBanks(regs *reg);
109 void pic16_addMemRange(memRange *r, int type);
110 void pic16_setMaxRAM(int size);
112 #endif /* __DEVICE_H__ */