Hi,
I’ve posted a question about FD support, I did not get any reply and I’m confused a little bit using the drivers (I do not know when to use functions with File Descriptor support, does using file descriptor support need to work with Linux?). Your reply will be much appreciated.
Here is my question :
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;
}
Best regards,
CR
New Contributor
