Tool/software: Code Composer Studio
Hi,
I have connected in my MSP430FR6989 a 4x4 keypad in order to use it as input for a calculator.
the rows of the keypad are connected in the pins p2.1 to p2.4 and these pins are configured as IRQ and enable the pull-up resistors.
the columns of the keypad are connected in the pins p8.4 to p8.7 and these pins are configured as output and the output is low.
My first step was making a test that when a button is pressed, the microcontroller goes a attend the interrupt and in the LCD appear 543210, but not appear nothing
this is my code
#include "msp430.h"
volatile int edge =0x1E;
const unsigned char lcd_num[14] =
{ 0xFC, // 0
0x60, // 1
0xDB, // 2
0xF3, // 3
0x67, // 4
0xB7, // 5
0xBF, // 6
0xE4, // 7
0xFF, // 8
0xF7, // 9
0xEF, // a
0x3F, //B
0x9C, // C
0x7B // d
};
int main(void)
{
msp_init();
LCD_initialize();
Init_4_4_KeyPad();
Init_ISR(edge);
__enable_interrupt(); // Set global interrupt enable bit in SR register
_BIS_SR(LPM4 | GIE);
}
#pragma vector = PORT2_VECTOR
__interrupt void Port_2() // function called when the port is interrupted (button pressed)
{
LCDCMEMCTL = LCDCLRM; // Clear LCD memory
LCDM8 = lcd_num[0];
LCDM15 = lcd_num[1];
LCDM19 = lcd_num[2];
LCDM4 = lcd_num[3];
LCDM6 = lcd_num[4];
LCDM10 = lcd_num[5];
//Turn LCD on
LCDCCTL0 |= LCDON;
}
void LCD_initialize()
{
PJSEL0 = BIT4 | BIT5; // For LFXT
LCDCPCTL0 = 0xFFF0; // Init. LCD segments 4, 6-15
LCDCPCTL1 = 0xF83F; // Init. LCD segments 16-21, 27-31
LCDCPCTL2 = 0x00F8; // Init. LCD segments 35-39
// Disable the GPIO power-on default high-impedance mode
// to activate previously configured port settings
PM5CTL0 &= ~LOCKLPM5;
// Configure LFXT 32kHz crystal
CSCTL0_H = CSKEY >> 8; // Unlock CS registers
CSCTL4 &= ~LFXTOFF; // Enable LFXT
do
{
CSCTL5 &= ~LFXTOFFG; // Clear LFXT fault flag
SFRIFG1 &= ~OFIFG;
}
while (SFRIFG1 & OFIFG); // Test oscillator fault flag
CSCTL0_H = 0; // Lock CS registers
// Initialize LCD_C
// ACLK, Divider = 1, Pre-divider = 16; 4-pin MUX
LCDCCTL0 = LCDDIV__1 | LCDPRE__16 | LCD4MUX | LCDLP | LCDSON;
// VLCD generated internally,
// V2-V4 generated internally, v5 to ground
// Set VLCD voltage to 2.60v
// Enable charge pump and select internal reference for it
LCDCVCTL = VLCD_1 | VLCDREF_0 | LCDCPEN;
LCDCCPCTL = LCDCPCLKSYNC; // Clock synchronization enabled
//LCDCMEMCTL = LCDCLRM;// Clear LCD memory
//LCDCCTL0 |= LCDON;
}
void msp_init()
{
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
P2DIR &= ~(BIT1|BIT2|BIT3|BIT4); // Set pins P2.1- P2.4 to be an input
P2REN |= BIT1|BIT2|BIT3|BIT4; // Enable internal pullup/pulldown resistor on P2.1- P2.4
P2OUT |= BIT1|BIT2|BIT3|BIT4; // Pullup selected on P2.1- P2.4
}
void Init_ISR(int f)
{
P2IES = f; // edge selection PxIFG flag is set with a high-to-low (f==1)
// or low-to-high (f==0) transition
P2IFG &= ~(BIT1|BIT2|BIT3|BIT4); // Clear the P2.0 interrupt flag
P2IE = 0x1E; // 2.1to2.4 port's interrupt eneable set
}
void Init_4_4_KeyPad()
{
P8DIR |= (BIT4 | BIT5 | BIT6 | BIT7); // P8.4 to P8.7 pins output
P8OUT &= ~(BIT4 | BIT5 | BIT6 | BIT7); // P8.4 to P8.7 Level output as 0
}
Thank you for help me
