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I've done a program using the simulated serial port. My program has to communicate with a PC using the 232 interface, so I use the simulated serial port for the monitor, and the 232 interface for the program. The program works. The problem is when I burn the program in ROM, because I want it starts when I switch on the board. Then I erase the monitor program in the flash, and I burn my program in the external ROM. Then the communication 232 doesn't works. What is happening??. Here you can see my configuration of the serial port: S0BG = 0x0040; DP3 |= 0x0400; /* Set TXD for output */ DP3 &= ~0x0800; /* Set RXD for input */ P3 |= 0x0400; /* Set TXD high */ tx_restart = 1; /* Set restart flag */ S0CON = 0x8019; //8 bits, 2 stop, no parity S0RIC = 0x0076; //Interrupts RX S0TIC = 0x0075; //Interrupts TX S0TBIC = 0x0077;//Interrupts buffer TX The same program works from the RAM with monitor in ROM. I've tried using DAVE, but I haven't got any improvement. Can anybody help me? Thank you
First of all, I would suggest to use the _bfld_ instruction to set the DP3 register:
_bfld_ (DP3, 0x0C00, 0x0400);
IEN = 1;
Hi Beatriz, I burn my program in the external ROM. Then the communication 232 doesn't works. Do you mean that when you burn the program into ROM it partially works? Or it does it not work at all? The difference is significant. - mike
Hi, Mike.The program partially works. I have another interrupts source, with a timer 0, and they works properly. It's only the serial port.