Ollie Milton
Driver for a CD22M3494 cross point switcher
Library description
The CD22M3494 is a 16x8 crosspoint switch matrix, it can be used in any configuration i.e. 16 ins' 8 outs' or 16 outs' and 8 ins'. Control of the chip is pretty simple there are two parallel address buses a 4 byte address controls the X axis (16 IO pins) and a 3 byte address controls the Y axis (8 IO pins). A data bus says whether to open or close the switch and a 'strobe' bus actually performs the switch. This library provides a simple interface to control the CD22M3494 and provides a mechanism to associate source and destinations in pairs and switch the pairs via their names.
Diff: CD22M3494.h
- Revision:
- 4:6ffeb0008f11
- Parent:
- 3:fa46a8badc92
- Child:
- 5:ca315c82dc1b
--- a/CD22M3494.h Wed Sep 11 11:54:24 2013 +0000
+++ b/CD22M3494.h Thu Sep 19 11:53:21 2013 +0000
@@ -25,23 +25,40 @@
1 1 1 0 X14
1 1 1 1 X15
*/
+#define X0 "X0"
+#define X1 "X1"
+#define X2 "X2"
+#define X3 "X3"
+#define X4 "X4"
+#define X5 "X5"
+#define X6 "X6"
+#define X7 "X7"
+#define X8 "X8"
+#define X9 "X9"
+#define X10 "X10"
+#define X11 "X11"
+#define X12 "X12"
+#define X13 "X13"
+#define X14 "X14"
+#define X15 "X15"
-#define X0 0x00
-#define X1 0x01
-#define X2 0x02
-#define X3 0x03
-#define X4 0x04
-#define X5 0x05
-#define X12 0x06
-#define X13 0x07
-#define X6 0x08
-#define X7 0x09
-#define X8 0x0A
-#define X9 0x0B
-#define X10 0x0C
-#define X11 0x0D
-#define X14 0x0E
-#define X15 0x0F
+
+#define X0I 0x00
+#define X1I 0x01
+#define X2I 0x02
+#define X3I 0x03
+#define X4I 0x04
+#define X5I 0x05
+#define X12I 0x06
+#define X13I 0x07
+#define X6I 0x08
+#define X7I 0x09
+#define X8I 0x0A
+#define X9I 0x0B
+#define X10I 0x0C
+#define X11I 0x0D
+#define X14I 0x0E
+#define X15I 0x0F
/*
Y ADDRESS
@@ -56,14 +73,23 @@
1 1 1 Y7
*/
-#define Y0 0x0
-#define Y1 0x1
-#define Y2 0x2
-#define Y3 0x3
-#define Y4 0x4
-#define Y5 0x5
-#define Y6 0x6
-#define Y7 0x7
+#define Y0I 0x0
+#define Y1I 0x1
+#define Y2I 0x2
+#define Y3I 0x3
+#define Y4I 0x4
+#define Y5I 0x5
+#define Y6I 0x6
+#define Y7I 0x7
+
+#define Y0 "Y0"
+#define Y1 "Y1"
+#define Y2 "Y2"
+#define Y3 "Y3"
+#define Y4 "Y4"
+#define Y5 "Y5"
+#define Y6 "Y6"
+#define Y7 "Y7"
#define MAX_X 0x0F
#define MAX_Y 0x7
@@ -72,100 +98,162 @@
public:
+ /**Conucts a new CD22M3494 object
+ *
+ * @param x0 the pin name for the first byte of the x axis address
+ * @param x1 the pin name for the second byte of the x axis address
+ * @param x2 the pin name for the thrid byte of the x axis address
+ * @param x3 the pin name for the forth byte of the x axis address
+ * @param y0 the pin name for the first byte of the y axis address
+ * @param y1 the pin name for the second byte of the y axis address
+ * @param y2 the pin name for the thrid byte of the y axis address
+ * @param d the pin name for the data bus
+ * @param str the pin name for the strobe bus
+ * @param rs the pin name for reset.
+ */
CD22M3494(PinName x0, PinName x1, PinName x2, PinName x3, PinName y0, PinName y1, PinName y2, PinName d, PinName str, PinName rs) {
xbus = new BusOut(x0, x1, x2, x3);
ybus = new BusOut(y0, y1, y2);
data = new DigitalOut(d);
- strobe = new DigitalOut(str);
+ obe = new DigitalOut(str);
reset = new DigitalOut(rs);
data->write(0);
- strobe->write(0);
+ obe->write(0);
reset->write(0);
+ crosspointLookup[X0] = X0I;
+ crosspointLookup[X1] = X1I;
+ crosspointLookup[X2] = X2I;
+ crosspointLookup[X3] = X3I;
+ crosspointLookup[X4] = X4I;
+ crosspointLookup[X5] = X5I;
+ crosspointLookup[X6] = X6I;
+ crosspointLookup[X7] = X7I;
+ crosspointLookup[X8] = X8I;
+ crosspointLookup[X9] = X9I;
+ crosspointLookup[X10] = X10I;
+ crosspointLookup[X11] = X11I;
+ crosspointLookup[X12] = X12I;
+ crosspointLookup[X13] = X13I;
+ crosspointLookup[X14] = X14I;
+ crosspointLookup[X15] = X15I;
+ crosspointLookup[Y0] = Y0I;
+ crosspointLookup[Y1] = Y1I;
+ crosspointLookup[Y2] = Y2I;
+ crosspointLookup[Y3] = Y3I;
+ crosspointLookup[Y4] = Y4I;
+ crosspointLookup[Y5] = Y5I;
+ crosspointLookup[Y6] = Y6I;
+ crosspointLookup[Y7] = Y7I;
}
~CD22M3494() {
delete xbus;
delete ybus;
delete data;
- delete strobe;
+ delete obe;
delete reset;
associationTable.clear();
delete &associationTable;
}
+ /**Closes the switch at the given cross point.
+ *
+ * @param x the x axis
+ * @param y the y axis
+ */
bool crossPointConnect(unsigned short x, unsigned short y) {
if (x <= MAX_X && y <= MAX_Y) {
data->write(1);
xbus->write(x);
ybus->write(y);
- // let the data busses settle before setting strobe high
+ // let the data busses settle before setting obe high
wait_us(2);
- strobe->write(1);
- // strobe must be high for at least 20 ns
+ obe->write(1);
+ // obe must be high for at least 20 ns
wait_us(1);
- strobe->write(0);
+ obe->write(0);
return true;
}
return false;
}
+ /**Opens the switch at the given cross point.
+ *
+ * @param x the x axis
+ * @param y the y axis
+ */
bool crossPointDisconnect(unsigned short x, unsigned short y) {
if (x <= MAX_X && y <= MAX_Y) {
data->write(0);
xbus->write(x);
ybus->write(y);
- // let the data busses settle before setting strobe high
+ // let the data busses settle before setting obe high
wait_us(2);
- strobe->write(1);
- // strobe must be high for at least 20 ns
+ obe->write(1);
+ // obe must be high for at least 20 ns
wait_us(1);
- strobe->write(0);
+ obe->write(0);
return true;
}
return false;
}
- void associate(string name, unsigned short xp1, unsigned short xp2) {
- unsigned short *xps = new unsigned short[2];
- xps[0] = xp1;
- xps[1] = xp2;
- associationTable[name] = xps;
+ /**Associated the two given crosspoint with the given name, note, both crosspoint MUST be on the same axis.
+ *
+ * @param name the name of the association
+ * @param xp1 the first crosspoint to associate with the given name
+ * @param xp2 the second crosspoint to associate with the given name
+ */
+ bool associate(string name, string xp1, string xp2) {
+ if (crosspointLookup.count(xp1) && crosspointLookup.count(xp2)) {
+ Association *assoc = new Association();
+ assoc->xp1 = xp1;
+ assoc->xp2 = xp2;
+ associationTable[name] = assoc;
+ }
}
+ /**Connects all the crosspoints for the given associations.
+ *
+ * @param src the source association
+ * @param dst the destination to connect the source to.
+ */
bool routeAssociations(string src, string dst) {
if (associationTable.count(src) && associationTable.count(dst)) {
- crossPointConnect(associationTable[src][0], associationTable[dst][0]);
- crossPointConnect(associationTable[src][1], associationTable[dst][1]);
+ crossPointConnect(crosspointLookup[associationTable[src]->xp1], crosspointLookup[associationTable[dst]->xp1]);
+ crossPointConnect(crosspointLookup[associationTable[src]->xp2], crosspointLookup[associationTable[dst]->xp2]);
return true;
}
return false;
}
+ /**Disconnects all the crosspoints for the given associations.
+ *
+ * @param src the source association
+ * @param dst the destination to disconnect from the source.
+ */
bool unRouteAssociations(string src, string dst) {
if (associationTable.count(src) && associationTable.count(dst)) {
- crossPointDisconnect(associationTable[src][0], associationTable[dst][0]);
- crossPointDisconnect(associationTable[src][1], associationTable[dst][1]);
+ crossPointDisconnect(crosspointLookup[associationTable[src]->xp1], crosspointLookup[associationTable[dst]->xp1]);
+ crossPointDisconnect(crosspointLookup[associationTable[src]->xp2], crosspointLookup[associationTable[dst]->xp2]);
return true;
}
return false;
}
-
- bool getAssociation(string name, unsigned short *xps) {
- if (associationTable.count(name)) {
- xps[0] = associationTable[name][0];
- xps[1] = associationTable[name][1];
- return true;
- }
- return false;
- }
-
+
private:
BusOut *xbus;
BusOut *ybus;
DigitalOut *data;
- DigitalOut *strobe;
- DigitalOut *reset;
- map<string, unsigned short*> associationTable;
+ DigitalOut *obe;
+ DigitalOut *reset;
+ struct Association {
+ string name;
+ string xp1;
+ string xp2;
+ };
+ map<string, Association*> associationTable;
+ map<string, unsigned short> crosspointLookup;
};