Hi Bastian,
did you compare generated ASM code for 452 and 4520 ? Are there some
differences ?
V.
> Hi,
>
> Little follow-up on my own post.
> Tried the same code on the 18f452 (with some small changes to the config to
> make it run). Thistime using SDCC 2.7.0, as the 2.8 snapshot i was using
> complained about missing _usart functions.
>
> It runs as it should. Compiling the code for the 18f4520 using SDCC 2.7.0
> still doesn't work.
>
> Any ideas?
>
> Thanks,
> -Bastiaan van Kesteren
>
> On Monday 13 October 2008 14:39:19 Bastiaan van Kesteren wrote:
> > Hi,
> >
> > I'm working on a project using the 18f4520, and i've ran into a problem. It
> > seems that passing an array to a function results in garbage being read in
> > the receiving function.
> >
> > It seems as if the receiving function is using the wrong address to read
> > from! I've fiddled with the stack, but this didn't seem to influence the
> > problem. I'm now using the latest SDCC snapshot (2.8.4 #5250 (Oct 12 2008))
> > and gputils 0.13.6 on Linux. Tried SDCC 2.8.0 with similair results (the
> > garbage output was different, but still garbage..) Also tried to build this
> > on windows XP on another machine, using the same SDCC snapshot and gputils
> > version. No change there.
> >
> > Some code demonstrating this issue is attached below. I've compiled this
> > using
> >
> > sdcc -mpic16 -p18f4520 main.c
> >
> > and loading the resulting main.hex file using and ICD2 programmer from
> > MPLAB (on the Windows XP machine).
> >
> > Output on the uart @ 19200 baud should be "[????]", but I get "[??"
> > followed by a lot of garbage
> >
> > Hope anyone can give me some pointers here!
> >
> > Thanks in advance,
> > -Bastiaan van Kesteren
> >
> > --------------the code:--------------
> >
> > #include <pic18fregs.h>
> > #include <usart.h>
> > #include <stdio.h>
> >
> > /* Initialise a stack of 255 bytes at RAM address 0x300 */
> > #pragma stack 0x300 0xFF
> >
> > /* Baudrate = FOSC/(16(X+1)): 25 = 19200 @ 8MHz */
> > #define BAUDRATE 25
> >
> > /* Oscillator */
> > code char at __CONFIG1H _conf0 = _OSC_INTIO67_1H;
> >
> > /* Watchdog */
> > code char at __CONFIG2H _conf2 = _WDT_OFF_2H;
> >
> > /* Power up timeout and brown out detection enabled */
> > code char at __CONFIG2L _conf1 = _PWRT_ON_2L & _BOREN_ON_2L;
> > /* MCLR settings */
> > code char at __CONFIG3H _conf3 = _MCLRE_OFF_3H;
> > /* Low voltage programming disabled, Stack Overflow Reset enabled */
> > code char at __CONFIG4L _conf4 = _LVP_OFF_4L & _STVREN_ON_4L;
> > /* Code protection disabled */
> > code char at __CONFIG5L _conf5 = _CP0_OFF_5L & _CP1_OFF_5L & _CP2_OFF_5L &
> > _CP3_OFF_5L; /* EEPROM read protection disabled, code protection boot
> > disabled */ code char at __CONFIG5H _conf6 = _CPD_OFF_5H & _CPB_OFF_5H;
> > /* Table write protection disabled */
> > code char at __CONFIG6L _conf7 = _WRT0_OFF_6L & _WRT1_OFF_6L & _WRT2_OFF_6L
> > & _WRT3_OFF_6L; /* EEPROM write protection disabled, table write protect
> > boot disabled, config write protect disabled */ code char at __CONFIG6H
> > _conf8 = _WRTD_OFF_6H & _WRTB_OFF_6H & _WRTC_OFF_6H; /* Table read protect
> > disabled */
> > code char at __CONFIG7L _conf9 = _EBTR0_OFF_7L & _EBTR1_OFF_7L &
> > _EBTR2_OFF_7L & _EBTR3_OFF_7L; /* Table read protect boot disabled */
> > code char at __CONFIG7H _conf10 = _EBTRB_OFF_7H;
> >
> > void serial_init()
> > {
> > // BAUDCON - baudrate generation control Register
> > BAUDCON = 0; // 8 bit baudrate generator, auto-baud disabled
> >
> > // SPBRG - Baud Rate Generator Register
> > SPBRG = BAUDRATE;
> >
> > // BRGH - High Baud Rate Select Bit
> > TXSTAbits.BRGH = 1; // (1 = high speed)
> >
> > // SYNC - USART Mode select Bit
> > TXSTAbits.SYNC = 0; // (0 = asynchronous)
> >
> > // TRISC - Tri-state Data Direction Register for port C
> > // RC6 - 6th pin of port C - used for Serial Transmit
> > // RC7 - 7th pin of port C - used for Serial Receive
> > TRISCbits.TRISC6 = 0; // (0 = pin set as output)
> > TRISCbits.TRISC7 = 1; // (1 = pin set as input)
> >
> > // SPEN - Serial Port Enable Bit
> > RCSTAbits.SPEN = 1; // (1 = serial port enabled)
> >
> > // TXIE - USART Transmit Interupt Enable Bit
> > PIE1bits.TXIE = 0; // (0 = disabled)
> >
> > // RCIE - USART Receive Interupt Enable Bit
> > PIE1bits.RCIE = 1; // (1 = enabled)
> >
> > // TX9 - 9-bit Transmit Enable Bit
> > TXSTAbits.TX9 = 0; // (0 = 8-bit transmit)
> >
> > // RX9 - 9-bit Receive Enable Bit
> > RCSTAbits.RX9 = 0; // (0 = 8-bit reception)
> >
> > // CREN - Continuous Receive Enable Bit
> > RCSTAbits.CREN = 1; // (1 = Enables receiver)
> >
> > // TXEN - Trasmit Enable Bit
> > TXSTAbits.TXEN = 1; // (1 = transmit enabled)
> >
> > stdout = STREAM_USER;
> > }
> >
> > void init()
> > {
> > /* Internal oscillator @ 8MHz */
> > OSCCON &= 0x8F;
> > OSCCON |= 0x70;
> >
> > /* Disable watchdog */
> > WDTCONbits.SWDTEN = 0;
> > }
> >
> > void test_puts(data char *str)
> > {
> > usart_putc(str[0]);
> > while( usart_busy() );
> > }
> >
> > void main(void)
> > /*
> > The main function:
> > Initialises the system, and starts all interrupt based tasks.
> > */
> > {
> > char tekst[2];
> > tekst[0]='?';
> > tekst[1]=0;
> >
> > init();
> >
> > serial_init();
> >
> > while(1) {
> > usart_putc('[');
> > while( usart_busy() );
> >
> > /* (1): Send single character; works */
> > usart_putc('?');
> > while( usart_busy() );
> >
> > /* (2): Send characters from array; works */
> > usart_putc(tekst[0]);
> > while( usart_busy() );
> >
> > /* (3): Pass array to function, which sends them as (2) does; not
> > working, sending garbage */ test_puts(tekst);
> > while( usart_busy() );
> >
> > /* (4): send string using the library-functions; not working,
> > infinite loop */ usart_puts("?");
> > while( usart_busy() );
> >
> > usart_putc(']');
> > while( usart_busy() );
> > }
> > }
> >
> >
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