Altera Embedded Peripherals IP - Manual (Page 103)

#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include "system.h"
#include "altera_16550_uart.h"
#include "altera_16550_uart_regs.h"
#define ERROR -1
#define SUCCESS 0
#define MOCK_UART
#define BUFSIZE 512
char TXMessage[BUFSIZE] = "Hello World";
char RXMessage[BUFSIZE] = "";
int UARTDefaultConfig(UartConfig *Config)
{
Config->stop_bit = STOPB_1;
Config->parity_bit = NO_PARITY;
Config->data_bit = CS_8;
Config->baudrate = BR115200;
Config->fifo_mode = 0;
Config->hwfc = 0;
Config->rx_fifo_level= RXFULL;
Config->tx_fifo_level= TXEMPTY;
return 0;
}
int UARTBaudRateTest()
{
UartConfig *UART0_Config = malloc(1*sizeof(UartConfig));
UartConfig *UART1_Config = malloc(1*sizeof(UartConfig));
int i=0, j=0, direction=0, Match=0;
const int nBaud = 5;
int BaudRateCoverage[]= {BR9600, BR19200, BR38400, BR57600, BR115200};
altera_16550_uart_state* uart_0;
altera_16550_uart_state* uart_1;
printf("================================ UART Baud Rate Test Starts Here
=======================================\n");
uart_0 = altera_16550_uart_open ("/dev/a_16550_uart_0");
uart_1 = altera_16550_uart_open ("/dev/a_16550_uart_1");
for (direction=0; direction<2; direction++)
{
for (i=0; i<nBaud; i++)
{
UARTDefaultConfig(UART0_Config);
UARTDefaultConfig(UART1_Config);
UART0_Config->baudrate=BaudRateCoverage[i];
UART1_Config->baudrate=BaudRateCoverage[i];
printf("Testing Baud Rate: %d\n", UART0_Config->baudrate);
if(ERROR == alt_16550_uart_config (uart_0, UART0_Config)) return ERROR;
if(ERROR == alt_16550_uart_config (uart_1, UART1_Config)) return ERROR;
switch(direction)
{
case 0:
printf("Ping Pong Baud Rate Test: UART#0 to UART#1\n");
for(j=0; j<strlen(TXMessage); j++)
{
altera_16550_uart_write(uart_0, &TXMessage[j], 1, 0);
usleep(1000);
if(ERROR== altera_16550_uart_read(uart_1, RXMessage, 1, 0))
return ERROR;
if(TXMessage[j]==RXMessage[0]) Match=1; else return ERROR;
printf("Sent:'%c', Received:'%c', Match:%d\n", TXMessage[j],
UG-01085
2014.24.07
Driver Examples 9-17
16550 UART Altera Corporation
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