ISR driven UART is missing characters (even at 9600bps... same prob at 230400)

Hi David,

i dont understand your problem, but your code for uart was the first, which works me.

Thank you. (i have had problem in Quartus 12, NIOS2 EDS 12 that the# include <sys/alt_irq.h> didnt know these commands

alt_irq_register(UART1_IRQ,&context_uart1,IsrUart1 ); // install UART1 ISR

alt_irq_enable (UART1_IRQ);

When i use your init_uart and handle routine, it works:

// obsluha preruseni od uartu1

void IsrUart1(void* context, unsigned long id)

{

int ch;

ch = IORD_ALTERA_AVALON_UART_STATUS(UART_1_BASE);

// printf("Jsem v preruseni=%X\n",ch);

// pokud prisel znak, precti jej

if (ch & ALTERA_AVALON_UART_STATUS_RRDY_MSK)

{ ch = IORD_ALTERA_AVALON_UART_RXDATA(UART_1_BASE);

// printf("Ctu znak=%X\n",ch);

IOWR_ALTERA_AVALON_UART_STATUS(UART_1_BASE, 0);

if (ch==GPS_PREFIX) rx_start=1;

if (rx_start==1)

{ rx_buf[rx_cnt]= ch;

if (rx_cnt<RX_BUF) rx_cnt++;

if (rx_cnt==RX_BUF) { rx_flag=1; rx_start=0; }

}

}

}

// inicializace preruseni od uartu1

void init_uart1()

{

alt_irq_init (ALT_IRQ_BASE);

// alt_sys_init(); //

// nastav 9600Bd pro NIOS2 na 80MHz

IOWR_ALTERA_AVALON_UART_DIVISOR(UART_1_BASE, 8334);

IOWR_ALTERA_AVALON_UART_CONTROL(UART_1_BASE, ALTERA_AVALON_UART_CONTROL_RRDY_MSK);

alt_ic_isr_register(UART_1_IRQ_INTERRUPT_CONTROLLER_ID,UART_1_IRQ,IsrUart1,0,0);

// povol preruseni od uartu1

alt_ic_irq_enable(UART_1_IRQ_INTERRUPT_CONTROLLER_ID,UART_1_IRQ);

}

Thanks.

Jan, Czech Republic