Analog Devices ADSP-BF59x Blackfin, Hardware Reference Manual, Page: 392 / 772

Programming Examples
11-36 ADSP-BF59x Blackfin Processor Hardware Reference
r7 = w[p0+UART0_LSR-UART0_GCTL] (z);
CC = bittst(r7, bitpos(THRE));
if !CC jump uart_putc.wait;
w[p0+UART0_THR-UART0_GCTL] = r0; /* write initiates transfer
*/
r7 = [sp++];
rts;
uart_putc.end:
Use the routine shown in Listing 11-5 to transmit a C-style string that is
terminated by a null character.
Listing 11-5. UART String Transmission
/**************************************************************
* Transmit a null-terminated string.
* Input parameters: p1 points to the string
* p0 contains UART_GCTL register address
* Return values: none
*************************************************************/
uart_puts:
[--sp] = rets;
[--sp] = r0;
uart_puts.loop:
r0 = b[p1++] (z);
CC = r0 == 0;
if CC jump uart_puts.exit;
call uart_putc;
jump uart_puts.loop;
uart_puts.exit:
r0 = [sp++];
rets = [sp++];
rts;
uart_puts.end: