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murgui
Joined: 23 Dec 2015
Posts: 37
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| Multidimensional array RAM location |
 Posted: Wed Jul 06, 2016 7:33 am |
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Hi,
I'm using the PIC 18f2685 and my compiler version is 4.114.
I'm programming a system that monitors temperatures. The information is organized in a 3 dimensional array:
T[location][Part1/Part2][sensor]
Being location the place where it's read. Part1/Part2 each of the 2 bytes that conform the temperature and finally sensor the number of sensor of that location:
25,12ºC in the first location by the first sensor would be:
T[0][0][0]=12;
T[0][0][0]=25;
All this information is received from 7 Slave PCBs, finally all the information is organized as mentioned before in T[a][b][c].
My doubt comes when using the can_putd function for retransmitting this information to an external data acquisition system. I don't know how does the PIC internally organizes the information and so if my code is fine.
| Code: | #include <Master.h>
#define LED PIN_B7
int8 temp[7][2][6];
int8 adr[7] = {0xA1,0xAB,0xB5,0xBF,0xC9,0xD3,0xDD};
int8 n,i,Dir,cont,subcontador,stack=0,s,;
int32 cid=0x320;//cobid base de temperatura
void lectura(int8 Dir);
void escritura();
void canrx0_int();
void main(){
if(1==1){//CAN ini
can_init();
disable_interrupts(GLOBAL);
can_set_mode(CAN_OP_CONFIG);
BRGCON1.brp=1;
BRGCON1.sjw=1;
BRGCON2.prseg=2;
BRGCON2.seg1ph=7;
BRGCON2.sam=FALSE;
BRGCON2.seg2phts=FALSE;
BRGCON3.seg2ph=6;
BRGCON3.wakfil=FALSE;
can_set_mode(CAN_OP_NORMAL);
enable_interrupts(int_canrx0);
enable_interrupts(int_canrx1);
enable_interrupts(int_cantx0);
enable_interrupts(int_cantx1);
enable_interrupts(int_cantx2);
enable_interrupts(GLOBAL);}
while(1){
for (n=0;n<7;n++){
lectura(adr[n]);}
if (cont=1){
cont=0;
escritura();}
delay_ms(5);//tiempo por ciclo, optimizar.
}
}
void lectura(int8 Dir){//I2C Enlace
i2c_start();
i2c_write(Dir);// direccion de slave & slave->Master(1)
for (i=0;i<6;i++){
temp[n][1][i]=i2c_read(1);
temp[n][2][i]=i2c_read(1);}
temp[n][1][6]=i2c_read(1);
temp[n][2][6]=i2c_read(0);
i2c_stop();
}
void escritura(){//envio de mensajes por CAN
if (stack==7){
stack=0;}
[b]can_putd(cid+stack*10,&temp[stack][0][0],8,FALSE,FALSE);
can_putd(cid+stack*10+1,&temp[stack][1][2],4,FALSE,FALSE);[/b]
stack++;
}
#int_canrx0
void canrx0_int ( ) {//Deteccion mensaje sincronismo
cobid=((unsigned int16)RXB0SIDH << 3)|((RXB0SIDL & 0xE0)>>5);
lengthCAN = (unsigned int8)RXB0DLC & 0xF;
if (cobid == 0x80){
subcontador++
if (subcontador==20){
cont=1;
subcontador=0;
}
}
}
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Is the can_putd system correct? The information will be transmitted correctly?
I'm afraid the written code will send the information haphazardly. I want it to send
Thank you very much,
Murguizur.
Last edited by murgui on Wed Jul 06, 2016 8:42 am; edited 1 time in total |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19359
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| Posted: Wed Jul 06, 2016 8:38 am |
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This is actually a C question not CCS!.... 
C stores things in 'row major' order in memory.
So if you have an array [x][y][z]
Then in memory, you get [X0, Y0, Z0] , [X0, Y0, Z1], ...[X0, Y0, Zmax],
[X0, Y1, Z0] etc.
As you advance through memory, the right hand variable varies first, then the second etc.. |
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murgui
Joined: 23 Dec 2015
Posts: 37
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| Posted: Wed Jul 06, 2016 8:48 am |
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| Thank you very much, you were really helpful. I didn't know how to look for this. |
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