rasterman101
Newbie level 3
I am coding a PWM to a H-Bridge using a shift register. The code to the shift register works but when I look at my PWM, it appears that a logic gate is pulling down the signal on PORTC.RC3. I remove the wire from PORTC.RC3 to a logic gate, the clock signal is fine. Place the wire on the logic gate, the clock starts and stops. It appears that the signal on PORTC.RC3 is being loaded down by the logic gate.
Do I need a pull-up resistor on a transistor to drive the logic gate using a 16f690? I have swapped out the logic gate with a new gate.
Schematic
Do I need a pull-up resistor on a transistor to drive the logic gate using a 16f690? I have swapped out the logic gate with a new gate.
Code:
// 16f690
// 74HC08
// H-Bridge
#include "shift_data_in.h" // This clocks in data to the shift register
#include "output_info.h" // This outputs the data on the shift register
void main(){
CM1CON0.C1ON = 0x00; // disable comparitor
CM2CON0.C2ON = 0x00; // disable the other comparator
TRISC = 0x00; // Set all of PORTC as I/O
PORTC = 0; // Starts the shift register at zero
while(1){
// Turn right motor on
// Shift register info passing
DS_Data_IN(right_FW); // Sends info over to shift register
Delay_ms(100);
output_data(); // Outputs the data in the shift register
// My PWM worked using the libraries
// as well as coding the PWM
// This is just for testing purposes
for(y_in = 0; y_in <= 1000; ++y_in){
RC3_bit = 1;
Delay_ms(2);
RC3_bit = 0;
Delay_ms(2);
}
}
} // END WHILE
} // END MAINSchematic