#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "L138_LCDK_aic3106_init.h"
#include "L138_LCDK_switch_led.h"
enum {inputting, transmitting, recieving, requestMedium, backoff} states;
int counter = 0;
int counter_recv = 0;
char ch;
int16_t sample;
interrupt void interrupt4(void) // interrupt service routine
{
if(states == transmitting)
{
counter++;
}
if(states == recieving)
{
sample = input_left_sample();
counter_recv++;
}
output_left_sample(0);
return;
}
int main(void)
{
// Init string
states = recieving;
L138_initialise_intr(FS_8000_HZ,ADC_GAIN_0DB,DAC_ATTEN_0DB,LCDK_MIC_INPUT);
while(1)
{
if(counter_recv == 10)
{
states = inputting;
printf("What u want to transmit:");
//scanf("%[^\n]", &input[0]);
scanf(" %c", &ch);
states = transmitting;
counter = 0;
L138_initialise_intr(FS_8000_HZ,ADC_GAIN_0DB,DAC_ATTEN_0DB,LCDK_MIC_INPUT);
counter_recv = 0;
}
}
}In our L138/C6748 LCDK, the printf function halts the interrupt handler. We are able to re-initialize it if our input comes in through the "mic" input. Not so with the "line" input.
Attached is our test code illustrating the problem. We go through the interrupt handler 10 times, then ask for keyboard input. After receiving the input from the keyboard, we re-initialize the interrupt handler. With LCDK_MIC_INPUT, no problem; the interrupt handler restarts. With LCDK_LINE_INPUT, restart does not happen. This can be observed by following "counter" in the watch window.
What is causing this behavior? We would like to engage the user while bringing in data from the line input. We will be attempting a GUI solution as a work-around, but want to know why this problem is appearing.
Regards, Mike Briggs
