Hello,
I'm trying to define an alias to CAN buffers of a PIC18F25K80 chips
somewhat like:
typedef struct
{
union
{
struct
{
unsigned CON_FLTHIT : 5;
unsigned CON_RTRRO : 1;
unsigned CON_RXM1 : 1;
unsigned CON_RXFUL : 1;
};
uint8_t CON;
};
uint8_t SIDH;
uint8_t SIDL;
uint8_t EIDH;
uint8_t EIDL;
uint8_t DLC;
uint8_t D[8];
} can_buffer_t;
volatile __at(0xF60) can_buffer_t RXB0;
volatile __at(0xF30) can_buffer_t RXB1;
volatile __at(0xE80) can_buffer_t B0;
volatile __at(0xE90) can_buffer_t B1;
volatile __at(0xEA0) can_buffer_t B2;
volatile __at(0xEB0) can_buffer_t B3;
volatile __at(0xEC0) can_buffer_t B4;
volatile __at(0xED0) can_buffer_t B5;
but this ends up giving me errors:
error: More absolute sections use same address: 0xe80 -- "ustat_can_00/_B0",
"ustat_pic18f25k80_00/_B0CONbits"
error: More absolute sections use same address: 0xf60 -- "ustat_can_07/_RXB0",
"ustat_pic18f25k80_01/_RXB0CONbits"
however if I make the variables extern, I get:
error: Missing definition for symbol "_RXB0", required by "can_left.o".
error: Missing definition for symbol "_RXB1", required by "can_left.o".
error: Missing definition for symbol "_B5", required by "can_left.o".
error: Missing definition for symbol "_B4", required by "can_left.o".
error: Missing definition for symbol "_B3", required by "can_left.o".
error: Missing definition for symbol "_B2", required by "can_left.o".
error: Missing definition for symbol "_B1", required by "can_left.o".
error: Missing definition for symbol "_B0", required by "can_left.o".
I get that the variables are assigned ustat section which collides with
the section emitted by pic18f15k80.c, but it does have multiple
variables with same address in itself.
Am I doing something wrong?
Can I have the code to emit only symbols but not a memory section (if
it makes sense)?
With thanks,
Jānis
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