Gopal Nair
In this case display is 4 LEDs connected on output Port in active low configuration. and Input is two switches connected at the input. If SW1 is pressed the binary number represented by LEDs Decreases by 1 and If SW2 is pressed the number represented by LEDs increases by 1. Overflow and underflow of count is prohibited. Due to mechanical nature of input switches.It is connected in the active low configuration. The switch connected at the input has bouncing period of 5ms to 20ms. Please account this, for reliable operation of System "
Diff: main.cpp
- Revision:
- 0:9399ddeb3b2f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Aug 16 13:03:49 2017 +0000
@@ -0,0 +1,123 @@
+#include "mbed.h"
+
+enum HW_State{RST,RUN};
+
+DigitalOut Reset(PTD4);
+BusIn Input(PTA12,PTA4,PTA5,PTC8);
+DigitalOut SW1(PTA13);
+DigitalOut SW2(PTD5);
+
+Serial pc(USBTX,USBRX);
+
+enum HW_State FRDM_State;
+int Program_State[3];
+unsigned char command;
+ char curr_state;
+ char prev_state;
+ char inc_btn_state;
+ char dec_btn_state;
+ char counter;
+
+ void Check_error(char led_state,char btn_state)
+{
+ if(led_state == btn_state) //At Start or at Roll over
+ {
+ Program_State[0] = 0;
+ }
+ else
+ {
+ Program_State[0] = -1;
+ }
+}
+
+void Inc_Btn()
+{
+ SW1=1;
+ SW1=0;
+ wait_ms(rand()%5);
+ SW1=1;
+ wait_ms(rand()%5);
+ SW1=0;
+ wait_ms(rand()%10);
+ SW1=1;
+ wait_ms(rand()%5);
+ SW1=0;
+ wait_ms(50);
+ wait_ms(rand()%100);
+ SW1=1;
+
+}
+void Dec_Btn()
+{
+ SW1=1;
+ SW1=0;
+ wait_ms(rand()%5);
+ SW1=1;
+ wait_ms(rand()%5);
+ SW1=0;
+ wait_ms(rand()%10);
+ SW1=1;
+ wait_ms(rand()%5);
+ SW1=0;
+ wait_ms(50);
+ wait_ms(rand()%100);
+ SW1=1;
+
+}
+
+int main() {
+ Reset = 1;//Need to find what is the reset Methdology
+ FRDM_State=RST;
+ prev_state =0;
+ Input.mode(PullNone);
+ SW1=1;
+ SW2=1;
+ inc_btn_state=0;
+ while(1) {
+ if(pc.readable())
+ {
+ command=pc.getc();
+ switch(command)
+ {
+ case 's':
+ case 'S': Reset =0;
+ FRDM_State=RUN;
+
+ break;
+ case 'x':
+ case 'X': Reset =1;
+ FRDM_State=RST;
+ break;
+
+ case 'd':
+ case 'D': pc.printf("%d,%d\n\r",Program_State[0],Program_State[1]);
+ break;
+
+ }
+ }
+ if(FRDM_State == RUN)
+ {
+ for(counter =0; counter <20;counter++)
+ {
+ Inc_Btn();
+ if(inc_btn_state <= 15)
+ inc_btn_state++;
+ curr_state=Input & Input.mask();
+ Check_error(curr_state,inc_btn_state);
+ wait(0.2f);
+ }
+ for(counter =0; counter <20;counter++)
+ {
+ Dec_Btn();
+ if(inc_btn_state != 0)
+ inc_btn_state--;
+ curr_state=Input & Input.mask();
+ Check_error(curr_state,inc_btn_state);
+ wait(0.2f);
+ }
+ }
+
+ }
+}
+
+