Added an example for modyfying a timer's frequency while it's running

diff --git a/Examples/Big_LED_strip/Big_LED_strip.ino b/Examples/Big_LED_strip/Big_LED_strip.ino
index 2a84342c77a832678bf1cd64a849936224036091..60ee8ca0462d138bff32ae05225d149d27b7f66a 100644 (file)
--- a/Examples/Big_LED_strip/Big_LED_strip.ino
+++ b/Examples/Big_LED_strip/Big_LED_strip.ino
@@ -16,7 +16,7 @@
        we must do so directly without allocating a working buffer.
        Uncomment this to indicate that display_rgb_direct() must be used.
 */
-#define NEOPIXEL_ATE_MY_RAM
+//#define NEOPIXEL_ATE_MY_RAM
 //#define STM32
 
 #ifdef STM32
@@ -92,7 +92,7 @@ void setup()
 
 void loop()
 {
-       #ifndef NEOPIXEL_ATE_MY_RAM
+       #ifdef NEOPIXEL_ATE_MY_RAM
        uint8_t frame_buffer[ROWS][COLS][3] = {{{0}}};
 
        render_image(frame_buffer, big_image_data);

diff --git a/Examples/Timer_DIP_switch_frequency/Timer_DIP_switch_frequency.ino b/Examples/Timer_DIP_switch_frequency/Timer_DIP_switch_frequency.ino
new file mode 100644 (file)
index 0000000..4f1e4b7
--- /dev/null
+++ b/Examples/Timer_DIP_switch_frequency/Timer_DIP_switch_frequency.ino
@@ -0,0 +1,73 @@
+#define DIP_SW_0       8
+#define DIP_SW_1       9
+#define DIP_SW_2       10
+#define DIP_SW_3       11
+
+#define BUTTON         2
+#define LED                    13
+
+void button_ISR(void);
+
+volatile bool led_flag = false;
+
+void setup()
+{
+       pinMode(DIP_SW_0, INPUT_PULLUP);
+       pinMode(DIP_SW_1, INPUT_PULLUP);
+       pinMode(DIP_SW_2, INPUT_PULLUP);
+       pinMode(DIP_SW_3, INPUT_PULLUP);
+       pinMode(BUTTON, INPUT_PULLUP);
+       pinMode(LED, OUTPUT);
+       digitalWrite(LED, LOW);
+
+       attachInterrupt(digitalPinToInterrupt(BUTTON), button_ISR, FALLING);
+
+       // Disable interrupts during timer configuration
+       cli();
+
+       // Zero the control and counter registers
+       TCCR1A = TCCR1B = TIMSK1 = 0;
+       TCNT1 = 0;
+
+       // Select mode 15 (Fast PWM, TOP = OCR1A)
+       TCCR1A |= (1 << WGM10);
+       TCCR1A |= (1 << WGM11);
+       TCCR1B |= (1 << WGM12);
+       TCCR1B |= (1 << WGM13);
+
+       // Set max counter value (frequency)
+       OCR1A = 7811;
+
+       // Enable timer overflow interrupt
+       TIMSK1 |= (1 << TOIE1);
+
+       // Set prescaler to 1024
+       TCCR1B |= (1 << CS10) | (1 << CS12);
+
+       // Enable interrupts
+       sei();
+
+       Serial.begin(9600);
+}
+
+void loop()
+{
+  Serial.println(OCR1A);
+  delay(1000);
+}
+
+ISR(TIMER1_OVF_vect)
+{
+       digitalWrite(LED, led_flag);
+       led_flag = !led_flag;
+}
+
+void button_ISR(void)
+{
+       uint8_t f = ~PINB & 0x0F;
+
+       if (f)
+    {
+       OCR1A = 16000000 / (1024 * f) - 1;
+    }
+}

diff --git a/Examples/Timer_DIP_switch_frequency/Timer_DIP_switch_frequency.png b/Examples/Timer_DIP_switch_frequency/Timer_DIP_switch_frequency.png
new file mode 100644 (file)
index 0000000..31a4373
Binary files /dev/null and b/Examples/Timer_DIP_switch_frequency/Timer_DIP_switch_frequency.png differ

diff --git a/Examples/Timer_DIP_switch_frequency/tinkercad_link.txt b/Examples/Timer_DIP_switch_frequency/tinkercad_link.txt
new file mode 100644 (file)
index 0000000..0095544
--- /dev/null
+++ b/Examples/Timer_DIP_switch_frequency/tinkercad_link.txt
@@ -0,0 +1 @@
+ https://www.tinkercad.com/things/2g5g32R3Fb7