v0.1.0

ArduinoShrink.h

@@ -0,0 +1 @@
+// dummy include

wiring_digital.c

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+// (c) Ralph Doncaster 2020
+// thanks to Bill W for inspiration
+// github.com/WestfW/Duino-hacks/blob/master/fastdigitalIO/fastdigitalIO.h 
+// 20200709 v0.1.0 release
+
+#define ARDUINO_MAIN
+#include <Arduino.h>
+
+typedef volatile uint8_t* ioreg_p;
+
+inline ioreg_p pin_to_port(uint8_t pin)
+{
+    return (ioreg_p) port_to_output_PGM[digital_pin_to_port_PGM[pin]];
+}
+
+inline ioreg_p pin_to_ddr(uint8_t pin)
+{
+    return pin_to_port(pin) - 1;
+}
+
+inline ioreg_p pin_to_pinreg(uint8_t pin)
+{
+    return pin_to_port(pin) - 2;
+}
+
+inline uint8_t pin_to_bit(uint8_t pin)
+{
+    return digital_pin_to_bit_mask_PGM[pin];
+}
+
+void pinMode(uint8_t pin, uint8_t mode)
+{
+    if (mode == OUTPUT)
+        *pin_to_ddr(pin) |= (pin_to_bit(pin));
+    else {
+        *pin_to_ddr(pin) &= ~(pin_to_bit(pin));
+        if (mode == INPUT_PULLUP) *pin_to_port(pin) |= (pin_to_bit(pin));
+    }
+}
+
+void digitalWrite(uint8_t pin, uint8_t val)
+{
+    if (val == LOW)
+        *pin_to_port(pin) &= ~(pin_to_bit(pin));
+    else                                // HIGH
+        *pin_to_port(pin) |= (pin_to_bit(pin));
+}
+
+int digitalRead(uint8_t pin)
+{
+    return (*pin_to_pinreg(pin) & pin_to_bit(pin)) ? HIGH : LOW;
+}