I need three time period for onewire data reading. Without writing any ISR and can I get required time periods by polling M0, M1 and M2 match register interrup flags. Following code is what I am working on and it doesn't work. Is there any missing settings else?
#define Presc 14 //--------------------------16 bit write ---------------------------- void onewire_write(short int bayt, short int data) // 6, 54, 10 { short int count, bits; bits = bayt * 8; #define AB 6 #define BC 60 #define DD 10 #define M0_i 1 // Bit <2:0> <s:r:i> Stop,Reset,Interrupt #define M1_i 1<<3 // Bit <5:3> <s:r:i> " #define M2_irs 7<<6 // Bit <8:6> <s:r:i> " T1PR = Presc; // Prescale 15, 60 MHz CClock, 15 MHz PCLCK T1MR0 = AB; // Wait this long T1MR1 = AB+BC; // Wait this long T1MR2 = AB+BC+DD ; // Wait this long T1MCR = M0_i | M1_i | M2_irs; // Interrupt,stop and reset settings of Match regs T1TCR = 0x02; // Reset timer1 for (count=0; count<bits; ++count) { output_low(); T1TCR = 0x01; // timer1 starts while(!(T1IR & 1)); // Wait for int flag if ( data&1 != 0 ) output_float(); // write 0 or 1 data >>= 1; while(!(T1IR & 2)); // Wait for int flag output_float(); // set 1-wire high again, while(!(T1IR & 4)); // Wait for int flag T1IR = 0x07; // Clear M2, M1, M0 interrupts } }
You are at gmt+1, me +2 :)
I will follow your recommendation concerning unsigned integers. Most probably this issue caused me problems.
"// Wait this long" comment is not mine. I found a delay function on the net and modified a bit. Comment comes from that paste :) Function was something like:
void delay_ms(unsigned int msec) { T1TCR = 0x02; // Reset T1MCR = 0x07; // stop, reset and Interrupt T1PR = 15000; T1MR0 = msec; // Wait this long T1TCR = 0x01; // Go while(!(T1IR & 1)); // Wait for int flag T1IR = 0x01; // Clear interrupt }
Comments are very important. I sometimes forgot to modify or update. Due to its little code size, I thougt I understant the lines and functions (I have red also ds18b20 datasheet and grasped most parts) and left modification after finishing the code. You are right, if I request help from others, first I have to give descriptions, comments etc.
For the version control, sometimes I did it in very primitive way (daily or after some succes I get compressed back up and name it in a descriptive way). For an hobbyist like me, I think it is acceptable :)
Yes, I'm at GMT+1 (Sweden).
Don't do zip files. Hobbyist or professional doesn't much matter. The problems to solve is the same. Basically - what code constitutes a specific version? What was changed between two versions? What may be the reason that two versions behaves differently?
There are many free solutions available. Why not try a CVSNT repository? Works fine on a Windows machine, and since the repository is just text files, a bad disk accident still makes it possible to extract information from whatever files or disk sectors that did survive.
Dear Westermark, I have no previous CVS experience. I have just downloaded a free version, not yet installed. I will try. Thanks ... (PS:I am from Turkiye.)