Post by thread:CCS C Compiler's ENABLE option

Hi All, Please be informed that CCS C Compilers #use rs232 statement does not correctly handle 'enable' option for rs485 transmission. I used the following use directive. #use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, parity=N, bits=8, enable=PIN_C4, brgh1ok) With this directive, when I use a stement like 'printf(string)' , PIN_C4 is supposed to be HIGH during transmission, but it does not. to cope with this, I used the following code fragment: #use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, parity=N, bits=8, brgh1ok) ... ... output_high(PIN_C4); // enable RS485 driver. printf(string); output_low(PIN_C4); // disable RS485 driver. Regards, Ali GOKSU Software Engineer

At 03:55 20-12-99 EST, you wrote: >Hi All, > >Please be informed that CCS C Compilers #use rs232 statement does not >correctly handle 'enable' option for rs485 transmission. > You have to set this pin as an output using something like #use fixed_io(c_outputs=PIN_C1, PIN_C2, PIN_C5, PIN_C6). (see page 26 of your reference manual - nov 1998) What device / pins and compiler version do you use? The enable pin works fine on 16C74A / 16C73A with pin_C5. friendly regards, Bert