[PIC] how to send int array via UART on PIC16F887

[betuse]

Hi for all,
I need to send int array via UART to PC,
I use PIC16F887,
the code for creating array is:
(exactly I count impulses every 1ms from encoder with Timer1...)

unsigned int TMR1_value;
int vector[48];
char i = 0;

void main() {
     ANSEL  = 0;                        
     ANSELH = 0;
     OSCCON = 0b01110001;
     T1CON = 0b00000111;

     TRISC = 1;                         
     TRISA = 0;                         

     PORTA = 0b00000001;                

     TMR1H = TMR1L = 0;

  while(1) {
         TMR1_value = (TMR1H << 8) + TMR1L;
         vector[i] = TMR1_value;
         i++;
         delay_ms(1);                   
         if (i == 48) break;
  }
}

can sombody advice how to do that?
best regards

 

[horace1]

can sombody advice how to do that?
best regards[/QUOTE]

you can convert the int to a string and transmit that, e.g. assuming you have sprintf()
https://www.cplusplus.com/reference/cstdio/sprintf/

so send element vector

char text[50];
sprintf(text,"%d\n",vector[i]);
UART2printString(text);

or using itoa()
https://www.cplusplus.com/reference/cstdlib/itoa/

char text[50];
itoa(vector[i],text,10);
UART2printString(text);

or you can send it as two binary bytes

UART2putChar(vector[i]);
UART2putChar(vector[i]>>8);

you then some code at the received to put it back together again

 

[betuse]

Thanks Horace1.
I use mikroc for pic, and 887 dont have sprintf, also itoa is not allowed,
only third option is ok, but I can not use it, not work,
regards

 

[horace1]

if MikroC does have sprintf() or itoa() you can find code for itoa() online, e.g.
https://en.wikibooks.org/wiki/C_Programming/C_Reference/stdlib.h/itoa

what is the problem with the third option (binary)?

 

[betuse]

putChar is not supported in mikroc

 

[horace1]

putChar is not supported in mikroc

I don't use MikroC but here is some code for a Microchip mechatronics trainer using PIC16F917 with the Hi-Tech C compiler which may help

//  RS232 serial IO functions
#include <htc.h>


//**********************************************************
//*	Define serial communications control functons


void UARTInit(void)
{
    OSCCON=0x71;				// Fosc use internal oscillator 8MHz
	TXSTA=0;					// set up transmitter
	TXEN=1;						// Asychronous, 8 bit, BRGH=1
	BRGH=1;
	TRMT=1;
    TRISC6=1;

	RCSTA=0;					// set up receiver
	SPEN=1;						// Asychronous, 8 bit, continuous receive, serial enable
	CREN=1;    
	TRISC7=0;

// calculate Baud Rate = FOSC/(16 (X + 1))
//#define BaudRate 	51 	//SPBRG value for 9600 Baud when Fosc=8MHz and BRGH=1
#define BaudRate    8 	//SPBRG value for 57600 Baud when Fosc=8MHz and BRGH=1
	SPBRG=BaudRate;  			// setup baud rate
}

// put a char to RS232 serial line
int putchar(const int ch)
{
	while(!TRMT);
    TXREG=ch;
    //delay(1);
}

// put a string to RS232 serial line
void putString(const char *ch)
{
	while(*ch>0) { putchar(*ch); ch++; }
}

// check if a character has ben received - set true if so
int uartReceived(void)
{
  return RCIF;	// return character received
}

// get a character from serial line
int getchar(void)
{
   while(!uartReceived());	// wait for a character received
   return RCREG;						// return the character
}

 

[milan.rajik]

In mikroC there is IntToString() and LTrim(). Use them and convert each int value to string and then use UART_Write_Text() function to send string through UART.

 

[betuse]

Milan, can you help me with concrete advice on my code

while(1) {
         TMR1_value = (TMR1H << 8) + TMR1L;
         vector[i] = TMR1_value;
         i++;
         delay_ms(1);                   
         if (i == 48) break;
  }

how can I send vector(i) to PC via UART using IntToStr

 

[milan.rajik]

Please zip and post your mikroC project files. It will be easy to modify the code then.

---

Code C - [expand]
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char strTemp[17];
 
while(1) {
         vector[i] = (TMR1H << 8) + TMR1L;
     IntToStr(vector[i++], strTemp);
     UART1_Write_Text(strcat(Ltrim(strTemp), "\r\n"));
         delay_ms(1);                   
         if (i == 48) break;
}

---

 

[betuse]

Horace1, Milan,
I have working code for this example, but show count on LCD, and it is good only for some capture time >200ms,
if I use faster capture time, LCD can not show clear number...
that is the reason why I need other way to save count's.
code with LCD is:

// LCD
sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;

sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;


unsigned int TMR1_value;
char to_LCD[6];

void main() {
     ANSEL  = 0;                        
     ANSELH = 0;
     OSCCON = 0b01110001;
     T1CON = 0b00000111;

     TRISC = 1;                         
     TRISA = 0;                         
     
     PORTA = 0b00000001;                //motor pin's

     LCD_Init();
     LCD_Out(1, 1, "Count_imp");

  TMR1H = TMR1L = 0;

  while(1) {
         TMR1_value = (TMR1H << 8) + TMR1L;
         WordToStr(TMR1_value, to_LCD);
         LCD_Out(2, 1, to_LCD);
         delay_ms(200);  
  }
}

mcu is 887 and I use mikroC pro for Pic,

I send you that code because maybe you will advice some better way to do that...
I write count's on vector (887 support only 48 int vector array) but can not send to PC for analyse...
thanks again
and best regards

 

[betuse]

zip file in attach

 

[milan.rajik]

You get IRP bit has to be manually set warning in Compiler. It is better if you use PIC18F device.

Do you want to send TMR1H and TMR1L values separately ?

---

Code C - [expand]
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unsigned int vector[48];
char i = 0;
char strTemp[17];
 
void main() {
 
     OSCCON = 0b01110001;
     
     ANSEL  = 0;
     ANSELH = 0;
     UART1_Init(9615);
     Delay_ms(100);
     UART1_Write_Text("Start\r\n");
 
     T1CON = 0b00000111;
     
     TRISC = 1;
     TRISA = 0;
     
     PORTA = 0b00000001;
 
     TMR1H = TMR1L = 0;
     
 
 
     while(1) {
          IRP_bit = 1;
          vector[i] = (TMR1H << 8) + TMR1L;
          IntToStr(vector[i], strTemp);
          IRP_bit = 0;
          UART1_Write_Text(strcat(LTrim(strTemp), "\r\n"));
          i++;
          delay_ms(1);
     }
}

---

 

[betuse]

Thanks Milan,
you say: Do you want to send TMR1H and TMR1L values separately ?
is it possible to send (merge) TMR1H and TMR1L like whole number?

p.s code have UART1_Write_Text("Start\r\n");
but on terminal I dont see Start...
only numbers...

 

[milan.rajik]

Try this

---

Code C - [expand]
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unsigned int vector[48];
char i = 0;
char strTemp[17];
 
void main() {
 
     OSCCON = 0b01110001;
     
     ANSEL  = 0;
     ANSELH = 0;
     
     T1CON = 0b00000111;
     
     TRISC = 0x81;
     TRISA = 0x00;
     
     PORTA = 0x01;
 
     TMR1H = TMR1L = 0;
     UART1_Init(9615);
     Delay_ms(100);
     UART1_Write_Text("Start\r\n");
 
     while(1) {
          IRP_bit = 1;
          vector[i] = (TMR1H << 8) + TMR1L;
          IntToStr(vector[i], strTemp);
          IRP_bit = 0;
          UART1_Write_Text(strcat(LTrim(strTemp), "\r\n"));
          i++;
          delay_ms(1);
     }
}

---