Used for Flow Graph

Dependents:   nodedemo

Files at this revision

API Documentation at this revision

Comitter:
henryeherman
Date:
Sun Oct 30 11:29:10 2011 +0000
Commit message:
For 202A

Changed in this revision

Node.cpp Show annotated file Show diff for this revision Revisions of this file
Node.h Show annotated file Show diff for this revision Revisions of this file
diff -r 000000000000 -r be00bb0372eb Node.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Node.cpp	Sun Oct 30 11:29:10 2011 +0000
@@ -0,0 +1,75 @@
+#include "Node.h"
+
+unsigned int crc_table[16] = {
+0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
+0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
+0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
+0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
+};
+
+unsigned long crc_update(unsigned long crc, unsigned int data)
+{
+    char tbl_idx;
+    tbl_idx = crc ^ (data >> (0*4));
+    crc = crc_table[tbl_idx & 0x0f] ^ (crc >> 4);
+    tbl_idx = crc ^ (data >> (1*4));
+    crc = crc_table[tbl_idx & 0x0f] ^ (crc >> 4);
+    return crc;
+}
+
+unsigned long crc_string(char *s) {
+    unsigned long crc = ~0L;
+    while(*s)
+        crc = crc_update(crc, *s++);
+    crc = ~crc;
+    return crc;
+}
+
+
+unsigned long crc_len(char *s, unsigned int len) {
+    unsigned long crc = ~0L;
+    for(int idx=0;idx<len;idx++)
+        crc = crc_update(crc, *s++);
+    crc = ~crc;
+    return crc;
+}
+        
+Node::Node(unsigned int n, unsigned int k, PinName pinid) : pin(pinid) {
+    setupInputOutput(n,k);
+    delay=0;
+}
+
+Node::Node(unsigned int n, unsigned int k, PinName pinid, unsigned int delay_ms) : pin(pinid) {
+    setupInputOutput(n,k);
+    delay=delay_ms;
+}
+
+int Node::getSize() {
+    return ksize;
+}
+
+char *Node::execute(char *data) {
+    toggleHigh();
+    *tempbuffer=crc_len(data, nsize);
+    for(int idx=1;idx<ksize;idx++) {
+        *(tempbuffer+idx)=(char)crc_update(0,(*(tempbuffer+idx-1)));
+    }
+    wait_ms(delay);
+    toggleLow();
+    return tempbuffer;
+}
+
+
+void Node::setupInputOutput(unsigned int n, unsigned int k) {
+    nsize=n;
+    ksize=k;
+    data_ = (char *)malloc(nsize);
+    tempbuffer = (char *)malloc(nsize+ksize);
+}
+
+void Node::toggleHigh() {
+    pin=1;
+}
+void Node::toggleLow() {
+    pin=0;
+}
diff -r 000000000000 -r be00bb0372eb Node.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Node.h	Sun Oct 30 11:29:10 2011 +0000
@@ -0,0 +1,22 @@
+#ifndef NODE_H
+#define NODE_H
+#include "mbed.h"
+
+class Node {
+    public:
+        Node(unsigned int n, unsigned int k, PinName pinid);
+        Node(unsigned int n, unsigned int k, PinName pinid, unsigned int delay_ms);
+        char *execute(char *data );
+        int getSize();
+    private:
+        void setupInputOutput(unsigned int, unsigned int);
+        unsigned int ksize;
+        unsigned int nsize;
+        DigitalOut pin;
+        void toggleHigh();
+        void toggleLow();
+        char *data_;
+        unsigned int delay;
+        char *tempbuffer;
+};
+#endif