Altera Embedded Peripherals IP Uživatelský manuál stáhnout pdf (Strana 63)

For Nios II processor users, the HAL system library API provides complete access to the JTAG UART

core's features. Nios II programs treat the JTAG UART core as a character mode device, and send and

receive data using the ANSI C standard library functions, such as getchar() and printf().

The Printing Characters to a JTAG UART core as stdout example demonstrates the simplest possible

usage, printing a message to stdout using printf(). In this example, the Qsys system contains a JTAG

UART core, and the HAL system library is configured to use this JTAG UART device for stdout.

Table 7-1: Example: Printing Characters to a JTAG UART Core as stdout

#include <stdio.h>

int main ()

{

printf("Hello world.\n");

return 0;

}

The Transmitting characters to a JTAG UART Core example demonstrates reading characters from and

sending messages to a JTAG UART core using the C standard library. In this example, the Qsys system

contains a JTAG UART core named jtag_uart that is not necessarily configured as the stdout device. In

this case, the program treats the device like any other node in the HAL file system.

7-6

HAL System Library Support

UG-01085

2014.24.07

Altera Corporation

JTAG UART Core

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Altera Embedded Peripherals IP Uživatelský manuál Strana 63