Kyle Yancey / Mbed 2 deprecated SNES_Controller

This program uses a NUCLEO-F401RE to control an SNES console by sending the button states. (1 = Unpressed, 0 = Pressed) Data, Clock and Latch from the SNES must be connected to the appropriate pins. The NUCLEO is powered by the SNES through E5V. The power jumper should be moved to E5V configuration when powered by SNES.

Dependencies:   mbed

main.cpp@1:2a346daf070f, 2017-10-05 (annotated)

Committer:
kyancey
Date:
Thu Oct 05 15:21:03 2017 +0000
Revision:
1:2a346daf070f
Parent:
0:2af5c09cf1ee 
Added some comments.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kyancey 0:2af5c09cf1ee 1 #include "mbed.h"
kyancey 0:2af5c09cf1ee 2
kyancey 0:2af5c09cf1ee 3
kyancey 0:2af5c09cf1ee 4 DigitalOut Data(D2);
kyancey 0:2af5c09cf1ee 5 DigitalIn Latch(D3);
kyancey 0:2af5c09cf1ee 6 DigitalIn Clock(D4);
kyancey 0:2af5c09cf1ee 7
kyancey 0:2af5c09cf1ee 8 void waitUntilHigh(DigitalIn x)
kyancey 0:2af5c09cf1ee 9 {
kyancey 0:2af5c09cf1ee 10 while(x != 1) {};
kyancey 0:2af5c09cf1ee 11 }
kyancey 0:2af5c09cf1ee 12
kyancey 0:2af5c09cf1ee 13 void waitUntilLow(DigitalIn x)
kyancey 0:2af5c09cf1ee 14 {
kyancey 0:2af5c09cf1ee 15 while(x == 1) {};
kyancey 0:2af5c09cf1ee 16 }
kyancey 0:2af5c09cf1ee 17
kyancey 0:2af5c09cf1ee 18 void sendButton(int button)
kyancey 0:2af5c09cf1ee 19 {
kyancey 0:2af5c09cf1ee 20 Data = button;
kyancey 0:2af5c09cf1ee 21 waitUntilLow(Clock);
kyancey 0:2af5c09cf1ee 22 waitUntilHigh(Clock);
kyancey 0:2af5c09cf1ee 23 }
kyancey 0:2af5c09cf1ee 24
kyancey 1:2a346daf070f 25 // The SNES expects unpressed buttons to have a high state.
kyancey 1:2a346daf070f 26 // 1 = unpressed, 0 = pressed
kyancey 0:2af5c09cf1ee 27 void sendButtonsPressed(int b, int y, int select, int start,
kyancey 0:2af5c09cf1ee 28 int up, int down, int left, int right,
kyancey 0:2af5c09cf1ee 29 int a, int x, int l1, int r1)
kyancey 0:2af5c09cf1ee 30 {
kyancey 1:2a346daf070f 31 Data = 1; // Seems sensible to start with data being high
kyancey 0:2af5c09cf1ee 32 waitUntilHigh(Latch);
kyancey 0:2af5c09cf1ee 33 waitUntilLow(Latch);
kyancey 0:2af5c09cf1ee 34
kyancey 0:2af5c09cf1ee 35 sendButton(b);
kyancey 0:2af5c09cf1ee 36 sendButton(y);
kyancey 0:2af5c09cf1ee 37 sendButton(select);
kyancey 0:2af5c09cf1ee 38 sendButton(start);
kyancey 0:2af5c09cf1ee 39 sendButton(up);
kyancey 0:2af5c09cf1ee 40 sendButton(down);
kyancey 0:2af5c09cf1ee 41 sendButton(left);
kyancey 0:2af5c09cf1ee 42 sendButton(right);
kyancey 0:2af5c09cf1ee 43 sendButton(a);
kyancey 0:2af5c09cf1ee 44 sendButton(x);
kyancey 0:2af5c09cf1ee 45 sendButton(l1);
kyancey 0:2af5c09cf1ee 46 sendButton(r1);
kyancey 0:2af5c09cf1ee 47 }
kyancey 0:2af5c09cf1ee 48
kyancey 0:2af5c09cf1ee 49 int main()
kyancey 0:2af5c09cf1ee 50 {
kyancey 0:2af5c09cf1ee 51 while(1) {
kyancey 1:2a346daf070f 52 // Repeatedly press A
kyancey 0:2af5c09cf1ee 53 sendButtonsPressed(1, 1, 1, 1, //b,y,select,start
kyancey 0:2af5c09cf1ee 54 1, 1, 1, 1, //up,down,left,right
kyancey 0:2af5c09cf1ee 55 0, 1, 1, 1); //a,x,l1,r1
kyancey 0:2af5c09cf1ee 56
kyancey 0:2af5c09cf1ee 57 sendButtonsPressed(1, 1, 1, 1, //b,y,select,start
kyancey 0:2af5c09cf1ee 58 1, 1, 1, 1, //up,down,left,right
kyancey 0:2af5c09cf1ee 59 1, 1, 1, 1); //a,x,l1,r1
kyancey 0:2af5c09cf1ee 60 }
kyancey 0:2af5c09cf1ee 61 }