On 06.08.2011 0:39, Alex Stefan wrote:
> Does anybody have some example routines for reading/writing to high
> addresses in
> the flash?
Something like that:
typedef uint32_t address_t;
inline void flash::Init()
{
FCTL2 = FWKEY | FSSEL_SMCLK | (34 * FN0);
FCTL3 = FWKEY; // clear lock
}
inline void flash::Erase(address_t page)
{
asm volatile( "\r\n"
" push %B0 \r\n"
" push %A0 \r\n"
" popx.a %A0 \r\n"
" mov %3, %2 \r\n" // FCTL1 = FWKEY | ERASE;
" clrx 0(%A0) \r\n"
:"=r"(page)
:"0"(page), "m"(FCTL1), "i"((uint16_t)FWKEY | ERASE)
);
}
inline void flash::Write(address_t addr, uint8_t data)
{
asm volatile( "\r\n"
" push %B0 \r\n"
" push %A0 \r\n"
" popx.a %A0 \r\n"
" mov %4, %3 \r\n" // FCTL1 = FWKEY | WRT;
" movx.b %2, 0(%A0) \r\n"
:"=r"(addr)
:"0"(addr), "r"(data), "m"(FCTL1), "i"((uint16_t)FWKEY | WRT)
);
}
inline void flash::Write(address_t addr, uint16_t data)
{
asm volatile( "\r\n"
" push %B0 \r\n"
" push %A0 \r\n"
" popx.a %A0 \r\n"
" mov %4, %3 \r\n" // FCTL1 = FWKEY | WRT;
" movx.w %2, 0(%A0) \r\n"
:"=r"(addr)
:"0"(addr), "r"(data), "m"(FCTL1), "i"((uint16_t)FWKEY | WRT)
);
}
inline void flash::Write(address_t dst, uint8_t const * src, uint16_t size)
{
asm volatile( "\r\n"
" push %B0 \r\n"
" push %A0 \r\n"
" popx.a %A0 \r\n"
"1: \r\n"
" mov %7, %6 \r\n" // FCTL1 = FWKEY | WRT;
" movx.b @%1+, 0(%A0) \r\n"
" incx.a %A0 \r\n"
" dec %2 \r\n"
" jnz 1b \r\n"
:"=r"(dst), "=r"(src), "=r"(size)
:"0"(dst), "1"(src), "2"(size), "m"(FCTL1), "i"((uint16_t)FWKEY | WRT)
);
}
inline void flash::Read(uint8_t * dst, address_t src, uint16_t size)
{
asm volatile( "\r\n"
" push %B1 \r\n"
" push %A1 \r\n"
" popx.a %A1 \r\n"
"1: \r\n"
" movx.b @%1+, 0(%A0) \r\n"
" inc %A0 \r\n"
" dec %2 \r\n"
" jnz 1b \r\n"
:"=r"(dst), "=r"(src), "=r"(size)
:"0"(dst), "1"(src), "2"(size)
);
}
Please note, that you corrupted R15 in your routines and missed some FCTLx
registers magic to get data be actually written into flash.
>
> This is what I've written so far, but it's far from a working version:
>
> static inline __attribute__((always_inline)) void
> flash_write_byte(uint32_t addr, uint8_t val)
> {
>
> __asm__ __volatile__ (
> "dint \n"
> "nop \n"
> "mova %[addr], r15 \n"
> "movx %[val], @r15 \n"
> "eint \n"
> :
> :[addr] "r"(addr), [val] "m"(val)
> );
> }
> static inline __attribute__((always_inline)) uint8_t
> flash_read_byte(uint32_t addr)
> {
>
> uint8_t result;
> __asm__ __volatile__ (
> "dint \n"
> "nop \n"
> "mova %[addr], r15 \n"
> "movx @r15, %[result] \n"
> "eint \n"
> :[result] "=m"(result)
> :[addr] "r"(addr)
> );
> return result;
> }
>
> The problem, from what I could tell, comes from the inlining of the functions
> and the way the compiler generates their prologue. It would help me very
> much if
> I had fully working example to start from.
>
> Alex
>
>
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--
Regards,
Sergey A. Borshch mailto: [email protected]
SB ELDI ltd. Riga, Latvia
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