USCI serial port of msp430, a trick to fix it-EEWORLD

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The initialization settings of 430's USCI serial port (UART mode) are very complicated. UCA0BR0, UCA0BR1, UCA0MCTL, etc. need to be calculated according to the baud rate, and there are decimal part adjustments. Here is a header file shared. When operating the serial port, just one init_uart(9600); is enough. Note: 9600 can also be changed to other baud rates such as 4800, 115200, etc., which is very convenient.

#define clock 8000000
#define UCBRS(x) UCBRS_##x

void uart_init(long baud)
{
float x = clock / baud ;
long y = clock / baud ;
char n;
P1SEL = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
P1SEL2 = BIT1 + BIT2 ;
UCA0CTL1|=UCSSEL_2 ;

UCA0BR0 = y % 256;
UCA0BR1 = y / 256;

n=(char)((x-y)*8);
UCA0MCTL=2*n; //UCBRS_n n为*2
UCA0CTL1 &= ~UCSWRST;
IE2 |= UCA0RXIE ;
}

UCA0MCTL=2*n; This is a shift operation, please see register for details.

Of course, if the clock is modified, remember to modify the clock as well.

If it is useful, please support it. Below I will share the header file, which supports printf, getchar, etc.

Keywords：msp430 Reference address：USCI serial port of msp430, a trick to fix it

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