From ea3ab2e2638945e47872f081fb45a1bbc29937fe Mon Sep 17 00:00:00 2001
From: Alex Voinea <voinea.dragos.alexandru@gmail.com>
Date: Wed, 12 May 2021 16:49:02 +0300
Subject: [PATCH] gpio hal prototype

---
 src/hal/gpio.h | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++
 src/hal/pins.h |  4 +--
 2 files changed, 83 insertions(+), 3 deletions(-)
 create mode 100644 src/hal/gpio.h

diff --git a/src/hal/gpio.h b/src/hal/gpio.h
new file mode 100644
index 0000000..236e40f
--- /dev/null
+++ b/src/hal/gpio.h
@@ -0,0 +1,82 @@
+#include <inttypes.h>
+#include <avr/io.h>
+
+namespace hal {
+namespace gpio {
+
+typedef struct
+{
+    volatile uint8_t PINx;
+    volatile uint8_t DDRx;
+    volatile uint8_t PORTx;
+} GPIO_TypeDef;
+    
+    enum class Mode
+    {
+        input = 0,
+        output,
+    };
+    
+    enum class Pull
+    {
+        none = 0,
+        up,
+        down, //not available on the AVR
+    };
+    
+    enum class Level
+    {
+        low = 0,
+        high,
+    };
+
+struct GPIO_InitTypeDef
+{
+  Mode mode;
+  Pull pull;
+  Level level;
+  inline GPIO_InitTypeDef() : mode(Mode::input), pull(Pull::none){};
+  inline GPIO_InitTypeDef(Mode mode, Pull pull) : mode(mode), pull(pull) {};
+  inline GPIO_InitTypeDef(Mode mode, Level level) : mode(mode), level(level) {};
+};
+
+inline void WritePin(GPIO_TypeDef * const port, const uint8_t pin, Level level)
+{
+    if (level == Level::high)
+        port->PORTx |= (1 << pin);
+    else
+        port->PORTx &= ~(1 << pin);
+}
+
+inline Level ReadPin(GPIO_TypeDef * const port, const uint8_t pin)
+{
+    return (Level)(port->PINx & (1 << pin));
+}
+
+inline void TogglePin(GPIO_TypeDef * const port, const uint8_t pin)
+{
+    port->PINx |= (1 << pin);
+}
+
+inline void Init(GPIO_TypeDef * const port, const uint8_t pin, GPIO_InitTypeDef GPIO_Init)
+{
+    if (GPIO_Init.mode == Mode::output)
+    {
+        WritePin(port, pin, GPIO_Init.level);
+        port->DDRx |= (1 << pin);
+    }
+    else
+    {
+        port->DDRx &= ~(1 << pin);
+        WritePin(port, pin, (Level)GPIO_Init.pull);
+    }
+}
+
+}
+}
+
+#define GPIOB ((hal::gpio::GPIO_TypeDef *)&PINB)
+#define GPIOC ((hal::gpio::GPIO_TypeDef *)&PINC)
+#define GPIOD ((hal::gpio::GPIO_TypeDef *)&PIND)
+#define GPIOE ((hal::gpio::GPIO_TypeDef *)&PINE)
+#define GPIOF ((hal::gpio::GPIO_TypeDef *)&PINF)
\ No newline at end of file
diff --git a/src/hal/pins.h b/src/hal/pins.h
index 34a30f7..8745ad5 100644
--- a/src/hal/pins.h
+++ b/src/hal/pins.h
@@ -5,9 +5,7 @@
 namespace hal {
 namespace pins {
 
-    /// pin access routines
-    void WritePin(uint8_t pin, uint8_t value);
-    uint8_t ReadPin(uint8_t pin);
+    /// pin definitions
 
 } // namespace pins
 } // namespace hal