#include "io430g2553.h"
#include <stdint.h>
#include <string.h>
#define LED_RED BIT0
#define LED_GREEN BIT6
void config_Rx(void);
void getDutyCycle(void);
void flushCommand(void);
void PWM(uint8_t duty_cycle);
void PWM_Config();
void check_pwm_synatx();
uint8_t txCount=0,rxCount=0;
char command[15];
char ch='a';
uint8_t rxaFlag=0,rxbFlag=0;
uint8_t DUTY_CYCLE=0;
uint8_t PWM_FLAG=0;
voidint main( void )
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;
BCSCTL1 = CALBC1_1MHZ; // Run at 1 MHz
DCOCTLWDTCTL = CALDCO_1MHZ; // Run atWDTPW 1+ MHz
WDTHOLD;
//By default Clock is 1MHz
config_Rx();
PWM_Config();
UCA0CTL0BCSCTL1 = 0;
UCA0CTL1CALBC1_1MHZ; = UCSSEL_2 ; // Clock from SMCLK;
UCA0BR1 = 0; // Upper byte of divider word
UCA0BR0 = 104; // 9600 BaudrateRun at 1 MHz
UCA0MCTL DCOCTL = UCBRS_1;CALDCO_1MHZ; // Low -frequency mode
//UCA0STAT = UCLISTEN; // Loopback mode
UCA0CTL1 &= ~UCSWRST; // Release from reset
__enable_interrupt(); // enableRun allat interrupts
1 MHz
IE2 |= UCA0RXIE;
//Enable RX interrupt
forPWM_Config(;;)
{;
// __low_power_mode_0 PWM(5);
switch __delay_cycles(ch5000000){;
//State 'a' is default statePWM(15);
in which Green LED__delay_cycles(5000000);
is 'ON' PWM(25);
case 'a':
P1OUT |= LED_RED;
if__delay_cycles(rxaFlag==15000000);
{
rxaFlag=0;
rxCount=0;}
IE2 |=PWM(50);
UCA0RXIE; //Whenever in this__delay_cycles(5000000);
state enable Rx interrupt
break;PWM(25);
//State 'b' corresponds to received command "ID_CON"__delay_cycles(5000000);
//When ever the device is in this statePWM(15);
RED LED is ON__delay_cycles(5000000);
case 'b' :
P1OUT &= ~LED_RED;
PWM(DUTY_CYCLE5);
DUTY_CYCLE=0; //Duty Cycle Achieved
ifwhile(rxbFlag==11)
{
rxbFlag=0;
rxCount=0;}
IE2 |= UCA0RXIE; //Re-Enable Rx interrupt{}
ch='a';
break;
}
}
}
void PWM_Config()
{
P1OUT &= 0x00; // Clearing P1OUT
P1SEL |= BIT6 ;
P1SEL2 &= ~BIT6 ;
P1DIR |= BIT6; // Configuring P1.6 as Output
}
void PWM(uint8_t duty_cycle)
{
TA0CTL =0;
TA0CTL |= TACLR;
TA0CCR1 |= (duty_cycle*100);
TA0CCR0 |= 10000;
TA0CTL |= TASSEL_2 + MC_1 + ID_0;// Register TA0CTL -> SMCLK/8, Up mode
TA0CCTL1 |= OUTMOD_7 ;//Set/Reset Mode
TA0CCTL0 &= ~CCIE; // Interrupt Disabled
}
void config_Rx(void)
{
// Configure P1.1 as UCA0RXD
P1SEL |= BIT1 ;
P1SEL2 |= BIT1 ;
P1DIR |= (LED_RED) ; // Set P1.0 to output direction
// P1.3 must stay at input
P1OUT &= ~(LED_RED); // set P1.0 to 0 (LED OFF)
}
// ----------------------------------------------------------------------
// ISR for USCI_A ,B0 RX: store data , process when all bytes received
// ----------------------------------------------------------------------
#pragma vector = USCIAB0RX_VECTOR
__interrupt void USCIAB0RX_ISR (void) // Acknowledge by read of RXBUF
{
command[rxCount]=UCA0RXBUF;
if(command[rxCount]==0xD) // Store recd data , update counter
{
IE2 &= ~UCA0RXIE; // if user enters 'Enter (Hex 0xD)
// Disable further receive interrupts
getDutyCycle();
if (PWM_FLAG==1)
{
ch='b'; // Go To state 'b'
rxbFlag=1;
PWM_FLAG=0;//PWM command serviced
}
else{
ch='a'; // Got to State 'a'
rxaFlag=1;
PWM_FLAG=0;//PWM command serviced
DUTY_CYCLE=0;
}
}
rxCount++;
}
/*******************************************************************************
The Function compareCommand(char str[]) compares the sent str with command
received. If str matches with the command received it returns one else
it returns zero
*******************************************************************************/
void getDutyCycle(void)
{
DUTY_CYCLE=((command[0]-48)*10)+(command[1]-48);
flushCommand();
PWM_FLAG=1;
}
/*****************************************************************************
flushCommand() clears the received command buffer
******************************************************************************/
void flushCommand(void)
{
uint8_t i=0;
for(i=0;i<15;i++)
{
command[i]='\0';
}
}
/******************************** END *****************************************/
Edited My question on received comment:
The problem with the void PWM(uint8_t duty_cycle) function is that first time it generates the correct PWM at P1.6, next if it is given a value it changes PWM to that DC, but I can not go back to lower DC.
To make my point clear say what I type at my Laptop terminal (
10(Enter (ASCII 0xD) - DC 10 acheieved,
20the fisrt 2 PWM functions in the code changes to correct duty cycle PWM(Enter5) DC achieved,
Now I try to decrease DC PWM(15 Enter) -Nothing happens),
Even after some point then the rest of time I amPWM values do not able to increase the DCproduce desired dutycycle.
