//------------------------------------------------------------------------------
// MAIN FUNCTION
//------------------------------------------------------------------------------
void main (void)
{
unsigned char index, voltage_out;
initialize_system();
printf("\n\rKeil Software, Inc.\n\r"); // Display starup message
printf("MCB517 MCU I²C Example Test Program\n\r");
printf("Version 1.0.0\n\r");
printf("Copyright 2000 - Keil Software, Inc.\n\r");
printf("All rights reserved.\n\n\r");
printf("P8591 Test Program....Reading from ADC channel 0, Writing to DAC!\n\r");
while (TRUE)
{
for (voltage_out = 0; voltage_out < 0xFF; voltage_out++)
{
write_dac(voltage_out); // Write voltage value to DAC
// Blink LEDs in sequence
for (index = 0x01; index < 0x80; index <<=1)
{
P4 = index;
delay_time(DELAY_BLINK);
}
for (index = 0x80; index > 0x01; index >>=1)
{
P4 = index;
delay_time(DELAY_BLINK);
}
// Read voltage (ADC 0) and display results
printf("DAC output: %3bu ADC Channel 0: %3bu\n\r", voltage_out, read_adc_channel(0x00));
}
}
}
/**
* Returns true if the touchscreen was touched
*/
bool
sense_touch_screen(
uint_fast8_t tile_width,
uint_fast8_t *tile_row_p,
uint_fast8_t *tile_column_p)
{
# define XDELTA_MAX 16 //32 //100
# define YDELTA_MAX 12 //24 //100
# define NUM_SAMPLES 4 //4 //2
# define RESOLUTION_BITS 10
# define SETTLING_DELAY() delay_loop(10000)
/*
* Approx. 50000 CPU clock cycles. If The CPU clock frequency is 72MHz,
* there are 72000 CPU clock cycles in 1 ms. So the settling delay is less
* than 1 ms.
*/
uint_fast16_t x_samples[NUM_SAMPLES*2];
uint_fast16_t y_samples[NUM_SAMPLES*2];
uint_fast16_t x_reading;
uint_fast16_t y_reading;
uint_fast8_t i;
uint_fast16_t yvalue_min = 1023;
uint_fast16_t yvalue_max = 0;
uint_fast16_t xvalue_min = 1023;
uint_fast16_t xvalue_max = 0;
uint_fast16_t xdelta, ydelta;
uint_fast16_t ts_max_value = 2 <<(RESOLUTION_BITS-1);
for (i = 0; i < NUM_SAMPLES; i++)
{
/*
* Power the "x-axis" layer of the touch panel, and use the "y-axis"
* layer to measure voltage corresponding to the x-axis position:
*/
touch_screen_polarize_X1_X2();
select_input_pin_adc_channel(TOUCH_SCREEN_Y_ADC_CHANNEL);
SETTLING_DELAY();
x_samples[i*2] =
read_adc_channel(g_adc_device_p, TOUCH_SCREEN_Y_ADC_CHANNEL);
/*
* Power the "y-axis" layer of the touch panel, and use the "x-axis"
* layer to measure voltage corresponding to the y-axis position:
*/
touch_screen_polarize_Y1_Y2();
select_input_pin_adc_channel(TOUCH_SCREEN_X_ADC_CHANNEL);
SETTLING_DELAY();
y_samples[i*2] =
read_adc_channel(g_adc_device_p, TOUCH_SCREEN_X_ADC_CHANNEL);
/*
* Power the "x-axis" layer of the touch panel, and use the "y-axis"
* layer to measure voltage corresponding to the x-axis position:
*/
touch_screen_polarize_X2_X1();
select_input_pin_adc_channel(TOUCH_SCREEN_Y_ADC_CHANNEL);
SETTLING_DELAY();
x_samples[(i*2)+1] =
read_adc_channel(g_adc_device_p, TOUCH_SCREEN_Y_ADC_CHANNEL);
/*
* Power the "y-axis" layer of the touch panel, and use the "x-axis"
* layer to measure voltage corresponding to the y-axis position:
*/
touch_screen_polarize_Y2_Y1();
select_input_pin_adc_channel(TOUCH_SCREEN_X_ADC_CHANNEL);
SETTLING_DELAY();
y_samples[(i*2)+1] =
read_adc_channel(g_adc_device_p, TOUCH_SCREEN_X_ADC_CHANNEL);
}
x_reading = 0;
y_reading = 0;
for (i = 0; i < NUM_SAMPLES; i ++)
{
uint_fast16_t tempyval = ts_max_value - y_samples[i*2+1];
uint_fast16_t tempxval = ts_max_value - x_samples[i*2+1];
x_reading += x_samples[i*2];
y_reading += y_samples[i*2];
x_reading += (ts_max_value - x_samples[(i*2)+1]);
y_reading += (ts_max_value - y_samples[(i*2)+1]);
if (yvalue_min > y_samples[i*2])
{
yvalue_min = y_samples[i*2];
}
if (yvalue_max < y_samples[i*2])
{
yvalue_max = y_samples[i*2];
}
if (yvalue_min > tempyval)
{
yvalue_min = tempyval;
}
if (yvalue_min < tempyval)
{
yvalue_max = tempyval;
}
if (xvalue_min > x_samples[i*2])
{
xvalue_min = x_samples[i*2];
}
if (xvalue_max < x_samples[i*2])
{
xvalue_max = x_samples[i*2];
}
if (xvalue_min > tempxval)
{
xvalue_min = tempxval;
}
if (xvalue_min < tempxval)
{
xvalue_max = tempxval;
}
}
x_reading /= NUM_SAMPLES*2;
y_reading /= NUM_SAMPLES*2;
xdelta = xvalue_max - xvalue_min;
ydelta = yvalue_max - yvalue_min;
if (x_reading < 1022 && y_reading > 1 &&
xdelta < XDELTA_MAX && ydelta < YDELTA_MAX)
{
#if 0 // XXX
extern volatile uint32_t tile_cursor_index;
extern volatile uint32_t same_tile_count;
console_printf(
"tile_cursor_index: %u, same_tile_count: %u, x_reading: %u, y_reading: %u\n",
tile_cursor_index, same_tile_count, x_reading, y_reading);
ATOMIC_POST_INCREMENT_UINT32(&same_tile_count);
#endif // XXX
map_xy_reading_to_tile(
x_reading, y_reading, tile_width, tile_row_p, tile_column_p);
return true;
}
return false;
}
