trying to unset LED... not jet woring

main.c

@@ -95,6 +95,17 @@ void max7219_ledMatrixSetLED(
 	spiWriteReg(display->spiCH, row,col);
 }
 
+void max7219_ledMatrixUnsetLED(
+		max7219_t *display,
+		uint8_t row,
+		uint8_t col)
+{
+	row = (row & 0x07) + 1;
+	col = 1 << (col & 0x07);
+	// TODO: find out how to turn off LED
+	spiWriteReg(display->spiCH, row,col+1);
+}
+
 
 
 void dispTest(max7219_t *disp)
@@ -245,7 +256,7 @@ int main(int argc, char *argv[])
 	max7219_shutdownDiaply(&ledMatrix,0);
 	max7219_setDecodeMode(&ledMatrix, NO_DECODE_DIGIT_7_TO_0);
 	max7219_setScanLimit(&ledMatrix, DSIPLAX_DIGIT_7_TO_0);
-	max7219_setIntensity(&ledMatrix,0x01);
+	max7219_setIntensity(&ledMatrix,0x0F);
 
 	max7219_ledMatrixSetLED(&ledMatrix,0,0);
 	delayMs(1000);
@@ -256,15 +267,25 @@ int main(int argc, char *argv[])
 		delayMs(100);
 	}
 */
+
+	while(1) {
+		max7219_ledMatrixSetLED(&ledMatrix,1,1);
+		delayMs(100);
+		max7219_ledMatrixUnsetLED(&ledMatrix,1,1);
+		delayMs(100);
+	}
+
 	while(1) {
 		for(i=0; i < 0x8; i++) {
 			max7219_ledMatrixSetLED(&ledMatrix,i,i+j);
-			//delayMs(20);
+			delayMs(100);
 		}
-		delayMs(50);
+		//delayMs(10);
 		j++;
 		if(j > 7) j =0;
 	}
+
+
 	
 	/*
 	while(1){