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Using UART FD

Chloé_Russell
Beginner
783 Views

Hello,

 

This is my first use of Software drivers. I'm working with the Quartus standard version 16.0.

 

when I used the "altera_avalon_uart_write" and "altera_avalon_uart_read" functions, things go right.. but when trying to use FD (altera_avalon_uart_write_fd and altera_avalon_uart_read_fd) , the parameter SP points to a false base address although the file has been correctly opened, it returns a valid value (!=NULL).

 

my code is :

 

int main()

{

 altera_avalon_uart_state* sp_UART_0;

  altera_avalon_uart_state* sp_UART_1;

 

  sp_UART_0->base = UART_0_BASE;

  sp_UART_1->base = UART_1_BASE;

 

  char tx_buffer[8] = "BITBANG";

  char rx_buffer[8];

 

   alt_fd* fp_uart_1;

   alt_fd* fp_uart_0;

 

   fp_uart_1= open ("/dev/uart_1", O_RDWR); //Open file for reading and writing

   fp_uart_0= open ("/dev/uart_0",O_RDWR); //Open file for reading and writing

 

   printf("call init uart\n");

   altera_avalon_uart_init(sp_UART_1, UART_1_IRQ_INTERRUPT_CONTROLLER_ID,UART_1_IRQ);

   altera_avalon_uart_init(sp_UART_0, UART_0_IRQ_INTERRUPT_CONTROLLER_ID,UART_0_IRQ);

 

   int wr = altera_avalon_uart_write_fd (fp_uart_1,tx_buffer,sizeof(tx_buffer)) ;

   printf("wr = %d\n",wr);

   alt_busy_sleep(1000000); / delay 1us /// 1 s

 

   int rd = altera_avalon_uart_read_fd (fp_uart_0,rx_buffer,sizeof(tx_buffer)) ;

   alt_busy_sleep(1000000); / delay 1us /// 1 s

   printf(" rd = %d\n",rd);

 

   printf("rx_buffer = '%s'\n\n",rx_buffer);

 

   printf("sp_UART_0 base = 0x%08X \n", sp_UART_0->base);

   printf("sp_UART_0 ctrl = 0x%08X \n", sp_UART_0->ctrl);

   printf("sp_UART_0 tx_buf = '%s' \n", sp_UART_0->tx_buf);

   printf("sp_UART_0 rx_buf = '%s' \n\n\n", sp_UART_0->rx_buf);

 

   printf("sp_UART_1 base = 0x%08X \n", sp_UART_1->base);

   printf("sp_UART_1 ctrl = 0x%08X \n", sp_UART_1->ctrl);

   printf("sp_UART_1 tx_buf = '%s' \n", sp_UART_1->tx_buf);

   printf("sp_UART_1 rx_buf = '%s' \n\n", sp_UART_1->rx_buf);

 

   printf(" rx_buffer = %s\n",rx_buffer);

 

  altera_avalon_uart_close (fp_uart_1) ;

  altera_avalon_uart_close (fp_uart_0) ;

 

  free(fp_uart_1);

  free(fp_uart_0);

 

 return 0;

}

 

 

I'm not sure if I'm missing or using things wrong, any help would be much appreciated. Thank you in advance

 

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