Need help for my RS232 in NIOS II

[Altera_Forum]

Hi,  

 I am doing a project with NIOS II and I need to transfer data between my board and the PC through the RS232.  I generated a NIOS II system with RS232 support. On my test, I can transfer data from the FPGA board to PC through RS232 by using the "IOWR_ALTERA_AVALON_UART_TXDATA" macro, but I can't write data into the FPGA board through RS232.   My question is: If I want to write data into the FPGA board through RS232, do I need to setup the RS232's control register as "0x0080" (RRDY) before the writing? Or I just need to check the status register's value and write data when it is "0x0080". Even easiler, I just need to use the "IOWR_ALTERA_AVALON_UART_RXDATA" to write data directly without checking or setting the status of RS232.  Actually, I've tried all of the three above methods but failed. Everytime when I tried to read the data that I wrote in by using the "IORD_ALTERA_AVALON_UART_RXDATA", the value is "0".  Could anyone help me? Thanks.

[Altera_Forum]

Hey, 

 This is a function thats send one byte to the UART  void UART1_T(unsigned char ch) {  while((IORD_ALTERA_AVALON_UART_STATUS(UART1_BASE) & 0x040) != 0x040){ ;}  IOWR_ALTERA_AVALON_UART_TXDATA(UART1_BASE,ch); }  You only have to change UART1_BASE address to your UART address that you can find back in your system.h file  Good luck Regards Karel

[Altera_Forum]

--- Quote Start ---  Hi,   I am doing a project with NIOS II and I need to transfer data between my board and the PC through the RS232.  I generated a NIOS II system with RS232 support. On my test, I can transfer data from the FPGA board to PC through RS232 by using the "IOWR_ALTERA_AVALON_UART_TXDATA" macro, but I can't write data into the FPGA board through RS232.   My question is: If I want to write data into the FPGA board through RS232, do I need to setup the RS232's control register as "0x0080" (RRDY) before the writing? Or I just need to check the status register's value and write data when it is "0x0080". Even easiler, I just need to use the "IOWR_ALTERA_AVALON_UART_RXDATA" to write data directly without checking or setting the status of RS232.  Actually, I've tried all of the three above methods but failed. Everytime when I tried to read the data that I wrote in by using the "IORD_ALTERA_AVALON_UART_RXDATA", the value is "0".  Could anyone help me? Thanks.  --- Quote End ---      char character;  while(1)  {  alt_putstr("\nEnter character :\t");  character = alt_getchar();  alt_putstr("\nEchoed character :\t");  putchar(character);  }  //UART1_T(c);  return 0;

[Altera_Forum]

1. > Add RS232 in SOPC 

2. > Open RS232 in Eclips "FILE *fp", fp = fopen("path of RS232 from system.h like /dev/....","rb+"); 3. > use fprintf(fp,"%d", --your data---); for writing on RS232 port