Reorganizing library structure, prep for 2.0.0

2016-07-09 21:17:37 +02:00
parent 4811eb5573
commit ba6bb915c2
1020 changed files with 5 additions and 143645 deletions
@@ -0,0 +1,39 @@
+// Scope test for fast shiftOut function.
+#include <DigitalIO.h>
+
+// Create clockPin in output mode with inital level LOW.
+DigitalPin<12> clockPin(OUTPUT, LOW);
+
+// Create dataPin in output mode with inital level HIGH.
+DigitalPin<13> dataPin(OUTPUT, HIGH);
+
+//------------------------------------------------------------------------------
+// Time to send one bit is ten cycles or 625 ns for 16 MHz CPU.
+inline __attribute__((always_inline))
+void sendBit(uint8_t bit, uint8_t data) {
+  dataPin = data & (1 << bit);
+  clockPin = 1;
+  // may want a nop here - clock pulse is 125 ns wide
+  clockPin = 0;
+}
+//------------------------------------------------------------------------------
+// Time to send one byte is 5 usec.
+void shiftOut(uint8_t bits) {
+  sendBit(7, bits);
+  sendBit(6, bits);  
+  sendBit(5, bits);  
+  sendBit(4, bits);
+  sendBit(3, bits);
+  sendBit(2, bits);
+  sendBit(1, bits); 
+  sendBit(0, bits); 
+}
+//------------------------------------------------------------------------------
+void setup() {
+  // Not used.
+}
+//------------------------------------------------------------------------------
+void loop() {
+  shiftOut(0X55);
+  delay(2);
+}