[WIP] GPIO refactor: seems ok, ready for review

1 files changed, 143 insertions, 0 deletions

diff --git a/wirish/wirish_digital.cpp b/wirish/wirish_digital.cpp
new file mode 100644
index 0000000..0c0bd85
--- /dev/null
+++ b/wirish/wirish_digital.cpp
@@ -0,0 +1,143 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *****************************************************************************/
+
+/*
+ * Arduino-compatible digital I/O implementation.
+ */
+
+#include "wirish.h"
+#include "io.h"
+
+void pinMode(uint8 pin, WiringPinMode mode) {
+    gpio_pin_mode outputMode;
+    boolean pwm = false;
+
+    if (pin >= NR_GPIO_PINS) {
+        return;
+    }
+
+    switch(mode) {
+    case OUTPUT:
+        outputMode = GPIO_OUTPUT_PP;
+        break;
+    case OUTPUT_OPEN_DRAIN:
+        outputMode = GPIO_OUTPUT_OD;
+        break;
+    case INPUT:
+    case INPUT_FLOATING:
+        outputMode = GPIO_INPUT_FLOATING;
+        break;
+    case INPUT_ANALOG:
+        outputMode = GPIO_INPUT_ANALOG;
+        break;
+    case INPUT_PULLUP:
+        outputMode = GPIO_INPUT_PU;
+        break;
+    case INPUT_PULLDOWN:
+        outputMode = GPIO_INPUT_PD;
+        break;
+    case PWM:
+        outputMode = GPIO_AF_OUTPUT_PP;
+        pwm = true;
+        break;
+    case PWM_OPEN_DRAIN:
+        outputMode = GPIO_AF_OUTPUT_OD;
+        pwm = true;
+        break;
+    default:
+        ASSERT(0);
+        return;
+    }
+
+    gpio_set_mode(PIN_MAP[pin].gpio_device, PIN_MAP[pin].pin, outputMode);
+
+    if (PIN_MAP[pin].timer_num != TIMER_INVALID) {
+        /* enable/disable timer channels if we're switching into or
+           out of pwm  */
+        if (pwm) {
+            timer_set_mode(PIN_MAP[pin].timer_num,
+                           PIN_MAP[pin].timer_chan,
+                           TIMER_PWM);
+        } else {
+            timer_set_mode(PIN_MAP[pin].timer_num,
+                           PIN_MAP[pin].timer_chan,
+                           TIMER_DISABLED);
+        }
+    }
+}
+
+
+uint32 digitalRead(uint8 pin) {
+    if (pin >= NR_GPIO_PINS) {
+        return 0;
+    }
+
+    return gpio_read_bit(PIN_MAP[pin].gpio_device, PIN_MAP[pin].pin) ?
+        HIGH : LOW;
+}
+
+void digitalWrite(uint8 pin, uint8 val) {
+    if (pin >= NR_GPIO_PINS) {
+        return;
+    }
+
+    gpio_write_bit(PIN_MAP[pin].gpio_device, PIN_MAP[pin].pin, val);
+}
+
+void togglePin(uint8 pin) {
+    if (pin >= NR_GPIO_PINS) {
+        return;
+    }
+
+    gpio_toggle_bit(PIN_MAP[pin].gpio_device, PIN_MAP[pin].pin);
+}
+
+uint8 isButtonPressed() {
+    if (digitalRead(BOARD_BUTTON_PIN)) {
+        delay(1);
+        while (digitalRead(BOARD_BUTTON_PIN))
+            ;
+        return true;
+    }
+    return false;
+}
+
+uint8 waitForButtonPress(uint32 timeout) {
+    uint32 start = millis();
+    uint32 time;
+    if (timeout == 0) {
+        while (!isButtonPressed())
+            ;
+        return true;
+    }
+    do {
+        time = millis();
+        /* properly handle wrap-around */
+        if ((start > time && time + (0xffffffffU - start) > timeout) ||
+            time - start > timeout) {
+            return false;
+        }
+    } while (!isButtonPressed());
+    return true;
+}