Hello Georg,
Unfortunately you cannot attach anything to the mailing list. The system
will remove it.
You can however open a support ticket and attach your files there.
Maarten
> hello Philipp,
>
> youâre right, with '.eâ outside the brackets it worked right away! Now
> I am able to write to and read from the full 128kB STM8 flash :-)
> Attached please find the respective routines for SDCC and Cosmic. Passing
> arguments between C and assembler is done via global variables g_addr and
> g_val.
>
> Thanks a lot for your support and have a nice Christmas!
> Georg
>
> PS: is there a way to attach .zip files to the mailing list to avoid epic
> listings inside the mails?
>
> ââââââ
>
> /**
> \fn void flash_write_option_byte(uint16_t addr, uint8_t byte)
>
> \brief write option byte to flash
>
> \param[in] addr address to write to
> \param[in] byte byte to program
>
> write single option byte to given address
> */
> void flash_write_option_byte(uint16_t addr, uint8_t byte) {
>
> uint8_t *addr_near; // option bytes are in 2B range
>
> // check address
> if ((addr < 0x4800) || (addr > 0x48FF))
> return;
>
> // disable interrupts
> DISABLE_INTERRUPTS;
>
> // unlock w/e access to EEPROM & option bytes
> FLASH_DUKR.byte = 0xAE;
> FLASH_DUKR.byte = 0x56;
>
> // additionally required
> FLASH_CR2.byte |= 0x80;
> FLASH_NCR2.byte &= 0x7F;
>
> // wait until access granted
> while(!FLASH_IAPSR.reg.DUL);
>
> // set address
> addr_near = (uint8_t*) addr;
>
> // write option byte to p-flash
> *(addr_near++) = byte;
>
> // wait until done
> while (!FLASH_IAPSR.reg.EOP);
>
> // lock EEPROM again against accidental erase/write
> FLASH_IAPSR.reg.DUL = 0;
>
> // additional lock
> FLASH_CR2.byte &= 0x7F;
> FLASH_NCR2.byte |= 0x80;
>
>
> // enable interrupts
> ENABLE_INTERRUPTS;
>
> } // flash_write_option_byte
>
>
>
> /**
> \fn void flash_write_byte(uint32_t addr, uint8_t ch)
>
> \brief write single byte to flash
>
> \param[in] addr address to write to
> \param[in] ch byte to program
>
> write single byte to address in P-flash or EEPROM
> */
> void flash_write_byte(uint32_t addr, uint8_t ch) {
>
> // disable interrupts
> DISABLE_INTERRUPTS;
>
> // unlock w/e access to P-flash
> FLASH_PUKR.byte = 0x56;
> FLASH_PUKR.byte = 0xAE;
>
> // unlock w/e access to EEPROM
> FLASH_DUKR.byte = 0xAE;
> FLASH_DUKR.byte = 0x56;
>
> // wait until access granted
> while(!FLASH_IAPSR.reg.PUL);
> while(!FLASH_IAPSR.reg.DUL);
>
> // Cosmic compiler (supports far pointer)
> #if defined(__CSMC__)
>
> // write byte to p-flash (use 3b address for near&far range)
> *((@far uint8_t*) addr) = ch;
>
> // SDCC compiler (doesn't support far pointer --> use inline assembler)
> #elif defined(__SDCC)
>
> // store address & data globally for assember
> g_addr = addr;
> g_val = ch;
>
> // use inline assembler
> ASM_START
> ld a,_g_val
> ldf [_g_addr+1].e,a
> ASM_END
>
> #endif // SDCC
>
> // wait until done
> while (!FLASH_IAPSR.reg.EOP);
>
> // lock P-flash again against accidental erase/write
> FLASH_IAPSR.reg.PUL = 0;
>
> // lock EEPROM again against accidental erase/write
> FLASH_IAPSR.reg.DUL = 0;
>
> // enable interrupts
> ENABLE_INTERRUPTS;
>
> } // flash_write_byte
>
>
>
> /**
> \fn uint8_t read_byte(uint32_t addr)
>
> \brief read single byte from memory
>
> \param[in] addr memory address to read from
>
> \return byte read from memory
>
> read single byte from address in memory
> */
> uint8_t read_byte(uint32_t addr) {
>
> // Cosmic compiler (supports far pointer)
> #if defined(__CSMC__)
>
> // return read byte from memory (use 3b address for near&far range)
> return(*((@far uint8_t*) addr));
>
> // SDCC compiler (doesn't support far pointer --> use inline assembler)
> #elif defined(__SDCC)
>
> // store address & data globally for assember
> g_addr = addr;
>
> // use inline assembler
> ASM_START
> ldf a,[_g_addr+1].e
> ld _g_val,a
> ASM_END
>
> // return read byte from memory
> return(g_val);
>
> #endif // SDCC
>
> } // read_byte
>
>
>
>
>> Message: 2
>> Date: Tue, 16 Dec 2014 17:16:26 +0100
>> From: Philipp Klaus Krause <[email protected]>
>> Subject: Re: [Sdcc-user] Migrating from Cosmic to SDCC;
>> ASlink-Warning-Undefined Global (Philipp Klaus Krause)
>> To: [email protected]
>> Message-ID: <[email protected]>
>> Content-Type: text/plain; charset="windows-1252"
>>
>> On 16.12.2014 16:35, Georg Icking-Konert wrote:
>>> hi Philipp, hello Rolf,
>>>
>>> actually I have an STM8 application where I need access to >64kB
>>> address
>>> range. Specifically I want to program a 128kB device as a datalogger.
>>> The SW already works under Cosmic (using @far identifier), but I
>>> understand that sdcc doesn?t (yet?) support far address pointers. I
>>> tried to work around this using inline assembler, see the below code.
>>> Specifically sdcc aborts with the below error code in the line
>>> containing the LDF instruction. Does this mean that even the assembler
>>> doesn?t support far pointers? Or am I just using the wrong (i.e.
>>> Cosmic)
>>> syntax? For your support thanks a lot in advance!
>>
>> I'm not the one who wrote the assembler, but looking at the source it
>> seems the .e needs to be outside the brackets.
>>
>> Philipp
>>
>
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