I am working on dsPic33EP512GM604 microcontroller.
I have written a small program to light a tower lamp with 3 LEDs (RED, YELLOW, GREEN).
Below is the circuit diagram :
As shown in the circuit diagram :
RED led is connected to pin<20> RA1
YELLOW led is connected to pin<19> RA0
GREEN led is connected to pin<15> RB15
Below is my sample code :
// Tower LAMP
#define LAMP_ON 1 // LAMP ON
#define LAMP_OFF 0 // LAMP OFF
#define RED 0 // Color Code
#define YELLOW 1 // Color Code
#define GREEN 2 // Color Code
#define DEFAULT_LAMP 4 // Color Code
#define RED_LIGHT PORTAbits.RA1 // Output : RED Light
#define YELLOW_LIGHT PORTAbits.RA0 // Output : Yellow Light
#define GREEN_LIGHT PORTBbits.RB15 // Output : Green Light
#pragma config ICS = PGD3 // ICD Communication Channel Select bits (Communicate on PGEC1 and PGED1)
#pragma config JTAGEN = OFF // JTAG Enable bit (JTAG is disabled)
// FPOR
#pragma config BOREN = ON // Brown-out Reset (BOR) Detection Enable bit (BOR is enabled)
#pragma config ALTI2C1 = OFF // Alternate I2C1 pins (I2C1 mapped to SDA1/SCL1 pins)
#pragma config ALTI2C2 = OFF // Alternate I2C2 pins (I2C2 mapped to SDA2/SCL2 pins)
#pragma config WDTWIN = WIN25 // Watchdog Window Select bits (WDT Window is 25% of WDT period)
// FWDT
#pragma config WDTPOST = PS32768 // Watchdog Timer Postscaler bits (1:32,768)
#pragma config WDTPRE = PR128 // Watchdog Timer Prescaler bit (1:128)
#pragma config PLLKEN = OFF // PLL Lock Enable bit (Clock switch to PLL source will wait until the PLL lock signal is valid.)
#pragma config WINDIS = OFF // Watchdog Timer Window Enable bit (Watchdog Timer in Non-Window mode)
#pragma config FWDTEN = OFF // Watchdog Timer Enable bit (Watchdog timer enabled/disabled by user software)
// FOSC
#pragma config POSCMD = NONE // Primary Oscillator Mode Select bits (XT Crystal Oscillator Mode)
#pragma config OSCIOFNC = OFF // OSC2 Pin Function bit (OSC2 is clock output)
#pragma config IOL1WAY = OFF // Peripheral pin select configuration (Allow multiple reconfigurations)
#pragma config FCKSM = CSECMD // Clock Switching Mode bits (Clock switching is enabled,Fail-safe Clock Monitor is disabled)
// FOSCSEL
#pragma config FNOSC = FRC // Oscillator Source Selection (Internal Fast RC (FRC))
#pragma config PWMLOCK = ON // PWM Lock Enable bit (Certain PWM registers may only be written after key sequence)
#pragma config IESO = OFF // Two-speed Oscillator Start-up Enable bit (Start up with user-selected oscillator source)
// FGS
#pragma config GWRP = OFF // General Segment Write-Protect bit (General Segment may be written)
#pragma config GCP = OFF // General Segment Code-Protect bit (General Segment Code protect is Disabled)
// Timer 1 Interrupt
void __attribute__ ( (interrupt, no_auto_psv) ) _T1Interrupt( void )
{
static int i = 0;
static int count = 1;
IFS0bits.T1IF = 0;
T1CONbits.TON = 0;
// Do your stuff here
if ( count == 1000 ){
execTowerLamp (i, LAMP_ON);
i++;
if (i == 4) i = 0;
count = 0;
}
count++;
// execTowerLamp (YELLOW, LAMP_ON);
TMR1 = 0;
T1CONbits.TON = 1;
/* reset Timer 1 interrupt flag */
}
void InitClock( void )
{
// Configure PLL prescaler, PLL postscaler, PLL divisor
// Configure Oscillator to operate the device at 60Mhz
// Fosc= Fin*M/(N1*N2), Fcy=Fosc/2
// Fosc= 8M*60/(2*2)=120Mhz for 8M input clock
PLLFBD = 63; // M=65
CLKDIVbits.PLLPOST = 0; // N2=2
CLKDIVbits.PLLPRE = 0; // N1=2
// Initiate Clock Switch to FRC oscillator with PLL (NOSC=0b001)
__builtin_write_OSCCONH(0x01);
__builtin_write_OSCCONL(OSCCON | 0x01);
// Wait for Clock switch to occur
while (OSCCONbits.COSC!= 0b001);
// Wait for PLL to lock
while (OSCCONbits.LOCK!= 1);
}
// Initialize common Ports
void InitPorts () {
ANSELA = 0x00;
ANSELB = 0x00;
// Tower Lamp
TRISAbits.TRISA1 = 0; // Output : RED Light
TRISAbits.TRISA0 = 0; // Output : Yellow Light
TRISBbits.TRISB15 = 0; // Output : Green Light
// Rejector
TRISBbits.TRISB0 = 0; // Output : Rejector
// IR SENSOR
TRISBbits.TRISB1 = 1; // Input : IR Sensor
}
// Main function
int main(int argc, char** argv) {
int i = 0;
InitClock(); // This is the PLL settings
InitPort1(); // LEDs outputs, Switches Inputs
InitPorts(); // Configure all Input/Output Ports
init_Timer1();
execTimer1(40, 1); // timer for 40msec, status : ON
/* Wait at least 105 microseconds (1/9600) before sending first char */
DELAY_105uS;
while( 1 )
{
for (i = 0; i < 1000; i++){
DELAY_105uS;
}
}
return (EXIT_SUCCESS);
}
// Execute Tower Lamp
void execTowerLamp ( int color, int status){
switch (color) {
case RED :
RED_LIGHT = status;
YELLOW_LIGHT = !status;
GREEN_LIGHT = !status;
break;
case YELLOW :
RED_LIGHT = !status;
YELLOW_LIGHT = status;
GREEN_LIGHT = !status;
break;
case GREEN :
RED_LIGHT = !status;
YELLOW_LIGHT = !status;
GREEN_LIGHT = status;
break;
default :
RED_LIGHT = status;
YELLOW_LIGHT = status;
GREEN_LIGHT = status;
break;
}
}
Here is a datasheet
I am facing issue while toggling RED LAMP i.e. pin<20> RA1.
Conditions where i m facing this issue :
- If only RED LAMP is turned ON, It continue as ON forever
- IF only RED LAMP is toggled, It just turns ON for once than permanent OFF
- I have a Timer1 interrupt in my sample code, Here I am turning ON all three lamps simultaneously. So, RED_LAMP turns ON once than YELLOW and Then GREEN and Thereafter only YELLOW & GREEN. RED_LAMP turns ON Randomly once in a while.
Pin<19:20> have same multifuntion such as A/D, Comparators. I have turned Off other functions as mentioned in the datasheet.
Can any one help me resolving the issue ???
If I am lacking any info, please let me know. I will provide it asap.
