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Altera_Forum's avatar
Altera_Forum
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9 years ago

String operation

I have a string signal rx_uart_buf : string (0 to 127); Now I want to test every char value when ST_PARSE_COM => if (idx < RX_BUF_SIZE) then case character'pos(rx_uart_buf(idx)) i...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

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In what context? Strings are not suitable for synthesis, so I assume this is simulation only code?

Also, strings can only have a positive range, so cannot start at 0 - it must start at 1 or above?

Why bother coverting the char to an integer? why not just use the chars directly? 


if (idx < RX_BUF_SIZE) then
    case rx_uart_buf(idx) is
        when NUL  => ParseState <= ST_PARSE_IDLE;
        when ' ' => ParseState <= ST_PARSE_ARG1;
    end case;
    idx := idx + 1;
 end if;

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I see. Thank you. So it doesn't work in real life? I was planning to accumulate chars from terminal to rx_uart_buf and then parse the string.