baud rate set

jjl3 — Thu, 08 Jun 2006 08:29:37 GMT

hardwareSP56F801A60

software: Codewarrior 7.2

I used PE to generate a program of UART, baud rate is 9600.

it can work normally.

when I write myself, it always can't work normally. I set register as same as that program generated by PE.

this is program I wrote,

I always can't communicate with PC,

Please help me!

#include"56801.h"

typedef unsigned int word;
void SCI0_SendChar(unsigned char);

void main(void)
{

asm
{
   bfset             #$40,XFIU_CNTL
   bfset             #$103F,X:ISOCTL
   bfclr             #$FFBF,XFIU_CNTL
   bfclr             #$FFFB,XLLCR
};

while(*((word *)(PLLSR)) & 0x4 ){}

asm
{
      move              #$81,XLLCR
      move              #0,X:CLKOSR
      move              #$11D,XLLDB
   };

while(!(*((word *)(PLLSR)) & 0x20)){}

asm
{
   move              #$82,XLLCR

      bfclr             #6,X:GPIO_A_PER
      bfset             #6,X:GPIO_A_DDR
      bfclr             #6,X:GPIO_A_DR

      move              #0,XYS_CTRL
      orc               #3,X:GPIO_B_PER
      move              #0,XCI0_SCICR
      move              #$00c3,XCI0_SCIBR
      orc               #8,XCI0_SCICR
      bfset             #$0100,SR
      bfclr             #$0200,SR
};

      SCI0_SendChar('H');
   SCI0_SendChar('e');
   SCI0_SendChar('l');
   SCI0_SendChar('l');
   SCI0_SendChar('o');
   SCI0_SendChar('!');
   SCI0_SendChar('\n');

while(1)
{

}
}

void SCI0_SendChar(unsigned char chr)
{
while(!(*((word *)(SCI0_SCISR)) & 0x8000)){}
*((word *)(SCI0_SCIDR)) = chr;
}

Re: baud rate set

nikfo — Tue, 13 Jun 2006 13:05:49 GMT

Hi!
I am not using the sam processor as you are, but write to UART should be rather like.

My program look like this:

void SCI0_SendChar(char WriteBuffer){
While(!(SCI0SR1 & SCI0SR1_TDRE_MASK)){;}// Wait until TX buff empty SCI0DRL = WriteBuffer;
}

Works like a charm. In your program you use a lot of pointers and casting. I am not that into programming so i cant say if it is wrong or not. Take a look in your datasheet, maybe you have to do this way.

Compare your send command with mine:
*((word *)(SCI0_SCIDR)) = chr;
SCI0DRL = WriteBuffer;

I am using only 8 bit UART so i stay with char.
No final solution for you, but maybe a push in some direction =).

//Niklas

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