inituart.asm

来自「ADI 公司的DSP ADSP21369 EZ-KIT LITE开发板的全部源代」· 汇编 代码 · 共 45 行

/* This program enables UART0 in transmit and receive mode. The UART0 transmit
signal is connected to DPI pin 9 */

#include <def21369.h>


.global _initUART;
.extern _xmitmsg;

.section/dm seg_dmda;
.var welcome_message[] =  {12,'Hello!',
                           13,10,'This program echoes back whatever you type in...',13,10};
.global welcome_message;

.section/pm seg_pmco;
_initUART:

/* Sets the Baud rate for UART0 */
ustat1= UARTDLAB;
dm(UART0LCR) = ustat1;          //enables access to Divisor register to set baud rate for UART0

r0=0x1c; dm(UART0DLL) = r0;
r0=0x2;  dm(UART0DLH) = r0;     //0x21c = 540 for divisor value and gives a baud rate of 19200 at 331.776Mhz core clock

/* Configures the UART LCR */
ustat1 = UARTWLS8|              // word length 8
         UARTPEN|               // parity enable for odd parity
         UARTSTB ;              // two stop bits
dm(UART0LCR) = ustat1;          // sets UART0 Line with one stop bit,  odd parity and with baud rate of 19200


ustat1 = UARTEN;
dm(UART0TXCTL) = ustat1;        // enable UART0 transmitter

ustat1 = UARTEN;
dm(UART0RXCTL) = ustat1;         // enables UART0 in receive mode

r0 = welcome_message;
r1 = length(welcome_message);

call _xmitmsg;            // function to transmit welcome message
_initUART.end:
rts;