So I got this very strange problem that happens every time. I am trying to interface and LCD with the MSP430 module. But in this function at the middle of the loop, the variable i resets itself to 0 for no apparent reason at all, somethimes it even crashes.
This is the structure of the lcd_t struct:
struct lcd_t
{
uint8_t rs, rw, e;
uint8_t pin[8];
};
This is the function where i is defined and "reseted":
void
lcd_dat(const struct lcd_t* lcd, uint8_t dat)
{
static uint8_t i;
// Setting RS.
//
lcd_change_pin_state(lcd->rs, 1);
// Setting each data pin to match the dat.
//
for(i = 0; i < 8; i++) // TODO: Four bit mode
{
if(dat & (1 << i))
{
lcd_change_pin_state(lcd->pin[i], 1);
}
else
{
lcd_change_pin_state(lcd->pin[i], 0); <-- This is where i resets
}
}
// Setting E.
//
lcd_change_pin_state(lcd->e, 1);
__delay_cycles(2*1000);
// Clearing E.
//
lcd_change_pin_state(lcd->e, 0);
}
This is the function where i resets:
static volatile void
lcd_change_pin_state(uint8_t pin, uint8_t newstate)
{
if(newstate == 0)
{
if(pin/10 == 1)
{
P1OUT &= ~(1 << (pin % 10));
}
else
{
P2OUT &= ~(1 << (pin % 10));
}
}
else
{
if(pin/10 == 1)
{
P1OUT |= (1 << (pin % 10));
}
else
{
P2OUT |= (1 << (pin % 10));
}
}
}
Plese tell me what other information do you need! Thanks!
