baud rate calculation

Mar 01, 2011 1 Replies

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patilrohit103 15 years ago

I am having a problem calculating the baud rate of 9600 bauds for ARM7 (LPC2148) at 12MHZ crystal. I have figured out a value of :

U1DLM=0x00; U1DLL=0x62;

following is my UART1 initialization code:

void init_UART1() {

PINSEL0=0x00050000; // FOR UART1 U1LCR=0x83; U1DLM=0x00; U1DLL=0x62; U1LCR=0x03; U1FCR=0x01; }

please help me if there is any other solution.....

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Andy 15 years ago

this looks like a standard 16550, which needs a divisor to give you

16x the desired baud rate. 9600 x 16 =3D 153600. 12e6 / 153600 =3D 78.125, implies 0x4e would be the divisor. Note that async serial can usually tolerate some baud rate deviation as the receiver should resync on the start bit of every character.

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