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Student16
Joined: 02 Jan 2021
Posts: 5
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| Question about I2C |
 Posted: Wed Jan 13, 2021 11:29 am |
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Hi I have problems with I2C, I want to send an int value from the master to the slave and display this value on a LCD connnected to the slave.
But I am getting unexpected results (the LCD displays 11, which I think is caused by I2C).
See my code below, am I doing something wrong?
MASTER:
| Code: |
#include <16F877A.h>
#fuses XT, NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)
#use i2c(Master, sda=PIN_C4, scl=PIN_C3)
#define REEDCONTACT0 PIN_A1
#define REEDCONTACT1 PIN_A2
#define REEDCONTACT2 PIN_A3
#define REEDCONTACT3 PIN_A4
#define DRUKKNOP_FRONT0 PIN_C0
#define DRUKKNOP_FRONT1_OMLAAG PIN_C1
#define DRUKKNOP_FRONT1_OMHOOG PIN_C2
#define DRUKKNOP_FRONT2_OMLAAG PIN_C5
#define DRUKKNOP_FRONT2_OMHOOG PIN_C6
#define DRUKKNOP_FRONT3 PIN_C7
#define DRUKKNOP_FRONT_NOODKNOP PIN_A5
#define DRUKKNOP_LIFT0 PIN_B0
#define DRUKKNOP_LIFT1 PIN_B1
#define DRUKKNOP_LIFT2 PIN_B2
#define DRUKKNOP_LIFT3 PIN_B3
#define DRUKKNOP_LIFT_NOODKNOP PIN_B4
#define TEMP_SENSOR PIN_A0
void main (){
while(1){
if(input(REEDCONTACT0) == 1){
i2c_start();
i2c_write(0x12);
i2c_write(1);
i2c_stop();
}
if(input(REEDCONTACT1) == 1){
i2c_start();
i2c_write(0x12);
i2c_write(2);
i2c_stop();
}
if(input(REEDCONTACT2) == 1){
i2c_start();
i2c_write(0x12);
i2c_write(3);
i2c_stop();
}
if(input(REEDCONTACT3) == 1){
i2c_start();
i2c_write(0x12);
i2c_write(4);
i2c_stop();
}
if(input(DRUKKNOP_FRONT0) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(5);
i2c_stop();
}
if(input(DRUKKNOP_FRONT1_OMLAAG) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(6);
i2c_stop();
}
if(input(DRUKKNOP_FRONT1_OMHOOG) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(7);
i2c_stop();
}
if(input(DRUKKNOP_FRONT2_OMLAAG) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(8);
i2c_stop();
}
if(input(DRUKKNOP_FRONT2_OMHOOG) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(9);
i2c_stop();
}
if(input(DRUKKNOP_FRONT3) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(10);
i2c_stop();
}
if(input(DRUKKNOP_FRONT_NOODKNOP) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(11);
i2c_stop();
}
if(input(DRUKKNOP_LIFT0) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(12);
i2c_stop();
}
if(input(DRUKKNOP_LIFT1) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(13);
i2c_stop();
}
if(input(DRUKKNOP_LIFT2) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(14);
i2c_stop();
}
if(input(DRUKKNOP_LIFT3) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(15);
i2c_stop();
}
if(input(DRUKKNOP_LIFT_NOODKNOP) == 0){
i2c_start();
i2c_write(0x12);
i2c_write(16);
i2c_stop();
}
}
}
|
SLAVE:
| Code: |
#include <16F877A.H>
#fuses XT, NOWDT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use i2c(SLAVE, SDA=PIN_C4, SCL=PIN_C3, address=0x12)
//LCD module connections
#define LCD_RS_PIN PIN_C0
#define LCD_RW_PIN PIN_C5
#define LCD_ENABLE_PIN PIN_C6
#define LCD_DATA4 PIN_C7
#define LCD_DATA5 PIN_E0
#define LCD_DATA6 PIN_E1
#define LCD_DATA7 PIN_E2
//End LCD module connections
#define GROENE_LED0 PIN_A1
#define GROENE_LED1 PIN_A3
#define GROENE_LED2 PIN_A5
#define GROENE_LED3 PIN_B1
#define RODE_LED0 PIN_A0
#define RODE_LED1 PIN_A2
#define RODE_LED2 PIN_B4
#define RODE_LED3 PIN_B0
#include <lcd.c>
//====================================
int sensor;
#INT_SSP
void ssp_interrupt(){
sensor = i2c_read(0);
}
void print_op_LCD(int sensorwaarde){
lcd_putc('\f');
lcd_putc("Waarde:");
lcd_gotoxy(1, 2);
printf(lcd_putc, "%d", sensorwaarde);
delay_ms(1000);
}
void main(){
enable_interrupts(INT_SSP);
enable_interrupts(GLOBAL);
lcd_init();
lcd_putc("\fReady...\n");
while(1){
if(sensor == 1){
output_high(GROENE_LED0);
print_op_LCD(sensor);
delay_ms(1000);
output_low(GROENE_LED0);
}
if(sensor == 2){
output_high(GROENE_LED1);
print_op_LCD(sensor);
delay_ms(1000);
output_low(GROENE_LED1);
}
if(sensor == 3){
output_high(GROENE_LED2);
print_op_LCD(sensor);
delay_ms(1000);
output_low(GROENE_LED2);
}
if(sensor == 4){
output_high(GROENE_LED3);
print_op_LCD(sensor);
delay_ms(1000);
output_low(GROENE_LED3);
}
if(sensor == 5){
output_high(RODE_LED0);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED0);
}
if(sensor == 6){
output_high(RODE_LED1);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED1);
}
if(sensor == 7){
output_high(RODE_LED2);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED2);
}
if(sensor == 8){
output_high(RODE_LED3);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED3);
}
if(sensor == 9){
output_high(RODE_LED3);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED3);
}
if(sensor == 10){
output_high(RODE_LED3);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED3);
}
if(sensor == 11){
output_high(RODE_LED3);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED3);
}
if(sensor == 12){
output_high(RODE_LED3);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED3);
}
if(sensor == 13){
output_high(RODE_LED3);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED3);
}
if(sensor == 14){
output_high(RODE_LED3);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED3);
}
if(sensor == 15){
output_high(RODE_LED3);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED3);
}
if(sensor == 16){
output_high(RODE_LED3);
print_op_LCD(sensor);
delay_ms(1000);
output_low(RODE_LED3);
}
}
}
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Ttelmah
Joined: 11 Mar 2010
Posts: 19499
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| Posted: Wed Jan 13, 2021 11:51 am |
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Seriously, look at the I2C slave example (or look here). The first I2C
interrupt is when the address is received, not your data byte.... |
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temtronic
Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario
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| Posted: Wed Jan 13, 2021 2:46 pm |
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hmmmm I was thinking that, for example..
| Quote: |
if(sensor == 1){
output_high(GROENE_LED0);
print_op_LCD(sensor);
delay_ms(1000);
output_low(GROENE_LED0);
|
The value for 'sensor' is 1 same as 0b00000001.
This is NOT the same as the printable ASCII '1' character( (49 decimal, 0x31).
You would have to add 48 to the sensor value.
I don't know if the function print_op_LCD() does a conversion to translate the '1' into a printable '1'. |
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Student16
Joined: 02 Jan 2021
Posts: 5
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| Question about I2C |
| Posted: Wed Jan 13, 2021 6:37 pm |
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| temtronic wrote: | hmmmm I was thinking that, for example..
| Quote: |
if(sensor == 1){
output_high(GROENE_LED0);
print_op_LCD(sensor);
delay_ms(1000);
output_low(GROENE_LED0);
|
The value for 'sensor' is 1 same as 0b00000001.
This is NOT the same as the printable ASCII '1' character( (49 decimal, 0x31).
You would have to add 48 to the sensor value.
I don't know if the function print_op_LCD() does a conversion to translate the '1' into a printable '1'. |
It does with the following line:
printf(lcd_putc, "%d", sensorwaarde); |
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temtronic
Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario
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| Posted: Thu Jan 14, 2021 5:20 am |
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| Yes, that's because that function 'translates' the binary '1' into a printable character '1'. |
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