| ??? 05/13/05 18:07 Read: times |
#93395 - I'm wondering... Responding to: ???'s previous message |
msg interrupt 4 (void)
{ unsigned char j,xchar; unsigned int xaddress; xchar=rec_232(); // waiting for a correct command xaddress=0x0000; if (xchar==0x40) // fills blank for 64 byte in the eeprom { for (j=0x00; j<0x40; j++) { write_eeprom(xaddress,0x00); xaddress++; } } send_rs232(0x39); //sending a request do { //writing data into eeprom xchar=rec232(); //waiting for data write_eeprom(xaddress,xchar); xaddress++; } while (xchar != 0x38); // until a sentinel come } I'm just wondering if you realise what you're doing in this interrupt! I can see you have worst case at least (0x40 + 0x38) makes 0x78 = 120 I2c commands in your interrupt. Knowing that sending one byte is approx. 1-2ms (maybe a bit more, maybe a bit less), this means you're about100-200ms in your interrupt routine. On top of that, you're doing UART processing too. Knowing that an interrupt service should take as less as possible time (some 100's of usecs, maybe some ms), I would first work on this... Best rgds, --Geert |
| Topic | Author | Date |
| INT 4 C51 DOES'NT WANT TO EXIT | 01/01/70 00:00 | |
| yes well | 01/01/70 00:00 | |
| Why would it | 01/01/70 00:00 | |
| I'm wondering... | 01/01/70 00:00 | |
| Problem solved | 01/01/70 00:00 | |
You're welcome... | 01/01/70 00:00 |