Posted on December 12, 2008 at 13:17 I have designed my own board for the ST10F276 and written my own software using Tasking.
However, I have a strange problem when first powering up the board.
The micro runs fine for about 3 seconds, but then it stops running and just halts.
With power still applied, if I press the reset button on my board the program restarts and continues to run without any further problems.
The program only halts when first applying power to the board.
I have attached the schematic for my ST10 board, showing the reset and RPD pins etc (see attached stpdf).
I have attached a scope trace which was taken during power up of the board (see attached 5v-rst-rpd.jpg).
The trace shows the 5V supply, the reset signal and the RPD signal.
And below is some simple code I wrote to flash an LED every 100ms.
Like all my other programs, this program halts after 3 seconds when the board is powered up.
But then works fine when the reset button is pressed.
/****************************************************/
#include ''regf276e.h''
#define Set_Priority_02(reg) (reg |= 0x08)
sfrbit LED0 _atbit(P1L,0);
sfrbit LED1 _atbit(P1L,1);
void main(void)
{
DP1L = 0x01; // P1L.0 is an output
LED0 = 1 ; // Turn LED 0 on
T2CON = 0x0027 ; // T2 is used in reload mode
T3CON = 0x0005 ;
T3UD = 0 ;
T2 = 49910 ;
T3 = 49910 ;
Set_Priority_02(T3IC) ;
T3IE = 1 ;
T3R = 1 ;
IEN = 1 ;
while(1) { ; } // Just hang around..
}
_interrupt( 0x23 ) void T3_overflow( void )
{
LED0 ^= 1 ;
}
/****************************************************/
[ This message was edited by: john.lintern on 12-12-2008 17:50 ]
[ This message was edited by: john.lintern on 12-12-2008 17:51 ]
[ This message was edited by: john.lintern on 12-12-2008 17:52 ]
[ This message was edited by: john.lintern on 12-12-2008 17:54 ]
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Attachments : 5v-rst-rpd.jpg :
https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I0Gq&d=%2Fa%2F0X0000000bXc%2FBPr6YT6tfVNJ1FEKXwFKcFFfB2kGFkuBjuHkzTHuiCU&asPdf=falsest10.pdf :
https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I0EB&d=%2Fa%2F0X0000000bXe%2Fkm7rYv_WXhQ1SXNy9MdhxxNEUVDAO0ZfTSfpGh8edec&asPdf=false
