Variable Baud rate generation

[mrarslanahmed]

Need help regarding PIC code, I am working to generate 5150 and 16600 Baud rate, using 8 BIT asycrhounous UART .. Please give me some design recommendation.

I am just delaying for approximatly 20Useconds for 5150 baud rate.

delay code is:

delay_200us()
{
for(j=0;j<60;j++)
asm nop;
}

My problem is i cant achieve precise result

 

[milind.a.kulkarni]

In this case you need to change your option register on demand .....and then you can use the timer interrupts to generate respective baud rates...

Good Luck

 

[betwixt]

I assume you are bit-banging a software UART. Is it possible to use the built in hardware UART?

You don't tell us which PIC and at what clock speed you are using but most PICs can generate both those rates at 4MHz and at 20MHz with less than 0.5% speed error. If your PIC has a 16-bit baud rate generator it will be even more accurate.

Brian.