There are lots of ways to solve this. For example:
<snip>
int i;
int leds=0x00;
int score[8];
bool sw_detected[8];
int main() {
Mosi Initialization
device.format(16,0); 16 bits, clock idles low, data capture on rising edge
pulse = 0; Initialize the latch signal
device.write(0x0000); Write 16 bits of data to the SPI to clear the relay port
pulse = 1; Latch the preceding data
wait_us(1); Enforce a minimum inter-transfer interval
Clear the score array to all 0, clear the detect flags
for (i=0; i<8; i++) {
score[i] = 0;
sw_detected[i] = false;
}
while (1) {
leds = 0; reset led pattern
Test Switches
if (sw0) {
leds = leds | led0; If switch one, set bit for led number 1
Increment score, only once per switch activation,
need to debounce this..
if (! sw_detected[0]){
score[0] = score[0] + 10;
sw_detected[0] = true;
}
}
else {
sw_detected[0] = false;
};
<snip, same for led1..led6>
if (sw7) {
leds = leds | led7; If switch seven, set bit for led number 7
Increment score, only once per switch activation,
need to debounce this..
if (! sw_detected[7]){
score[7] = score[7] + 10;
sw_detected[7] = true;
}
}
else {
sw_detected[7] = false;
};
now display the led pattern for all active leds
pulse = 0;
device.write(leds);
pulse = 1;
wait_us(1);
}
Wim Huiskamp.
1 reply
Here is code for a simple pinball circuit.
8 switches control 8 lamps.
Ball hits switch 1 - lamp 1 lights up. Ball hits switch 2 - lamp 2 lights up.
How do I change this code to make the lamps light up MOMENTARILY?
At the moment when a switch is activated the corresponding lamp stays on until another switch is activated.
I want each lamp to light up only as long as the corresponding switch is depressed.
I would also like to add a scoring system where 10 points is stored each time a switch gets activated.
Here is the code so far:
/*This tests the input switches on the pinball circuit. If a switch is pressed the corresponding led must light up MOMENTARILY There are 8 leds There are 8 input switches Switch led # binary value decimal value hex value 0 0 0000 0001 1 01 1 1 0000 0010 2 02 2 2 0000 0100 4 04 3 3 0000 1000 8 08 4 4 0001 0000 16 10 5 5 0010 0000 32 20 6 6 0100 0000 64 40 7 7 1000 0000 128 80 */ #include "mbed.h" SPI device(p5, p6, p7); // mosi, miso, scK DigitalOut pulse(p8);//mosi latch signal DigitalIn sw0(p21);//inputs DigitalIn sw1(p22); DigitalIn sw2(p23); DigitalIn sw3(p24); DigitalIn sw4(p25); DigitalIn sw5(p26); DigitalIn sw6(p27); DigitalIn sw7(p28); int led0=0x01;//assign hex values to leds int led1=0x02; int led2=0x04; int led3=0x08; int led4=0x10; int led5=0x20; int led6=0x40; int led7=0x80; int main() { // Mosi Initialization device.format(16,0); // 16 bits, clock idles low, data capture on rising edge pulse = 0; // Initialize the latch signal device.write(0x0000); // Write 16 bits of data to the SPI to clear the relay port pulse = 1; // Latch the preceding data wait_us(1); // Enforce a minimum inter-transfer interval // Test Switches while (1) { if (sw0) { // If switch one, light up led number 1 pulse = 0; // De-assert the latch signal device.write(led0); // Write 16 bits of data to the SPI pulse = 1; // Latch the preceding data wait_us(1); // Enforce a minimum inter-transfer interval }if (sw1) { pulse = 0; device.write(led1); pulse = 1; wait_us(1); }if (sw2){ pulse = 0; device.write(led2); pulse = 1; wait_us(1); }if (sw3){ pulse = 0; device.write(led3); pulse = 1; wait_us(1); }if (sw4){ pulse = 0; device.write(led4); pulse = 1; wait_us(1); }if (sw5) { pulse = 0; device.write(led5); pulse = 1; wait_us(1); }if(sw6){ pulse = 0; device.write(led6); pulse = 1; wait_us(1); }if (sw7) { pulse = 0; device.write(led7); pulse = 1; wait_us(1); } } }Cheers David