From 30e6778231f25c9ab1e18a9a02700aaf532ff408 Mon Sep 17 00:00:00 2001
From: Tadeusz Magura-Witkowski <teeed@na1noc.pl>
Date: Thu, 14 Mar 2019 23:01:58 +0100
Subject: [PATCH] More wiegand stuff

---
 Core/Inc/logger.h       |  3 +++
 Core/Inc/wiegand.h      | 18 ++++++++++++++
 Core/Src/main.c         |  2 +-
 Core/Src/stm32f1xx_it.c | 13 ++++++++++
 Core/Src/wiegand.c      | 54 ++++++++++++++++++++++++++++++++++++-----
 Makefile                |  1 +
 canpybara.ioc           |  6 +++--
 7 files changed, 88 insertions(+), 9 deletions(-)
 create mode 100644 Core/Inc/wiegand.h

diff --git a/Core/Inc/logger.h b/Core/Inc/logger.h
index 37c74db..c24cbe9 100644
--- a/Core/Inc/logger.h
+++ b/Core/Inc/logger.h
@@ -1,7 +1,10 @@
 #ifndef _LOGGER_H
 #define _LOGGER_H
 
+#include "stm32f1xx_hal.h"
+
 #include <inttypes.h>
+#include <stdio.h>
 
 #define __LOG__(format, loglevel, ...) printf("%-10"PRIu32" [%s:%d] " format "\n", HAL_GetTick(), __FILE__, __LINE__, ## __VA_ARGS__)
 #define __LOG(format, ...) __LOG__(format, "DEBUG", ## __VA_ARGS__)
diff --git a/Core/Inc/wiegand.h b/Core/Inc/wiegand.h
new file mode 100644
index 0000000..64826a1
--- /dev/null
+++ b/Core/Inc/wiegand.h
@@ -0,0 +1,18 @@
+#ifndef WIEGAND_H
+#define WIEGAND_H
+
+#define WIEGAND_MAX_LENGTH 30
+#define WIEGAND_BUFFER_BIT_LENGTH sizeof(wiegand_buffer)*8
+#define WIEGAND_TIMEOUT 100
+
+#define WIEGAND_CARD_LENGTH  26
+#define WIEGAND_KEYPRESS_LENGTH 6
+
+#define WIEGAND_ENABLED 
+
+void canpybara_wiegand_reset(void);
+
+void canpybara_wiegand_pin_pulse_interrupt(int bit);
+void canpybara_wiegand_systick_interrupt(void);
+
+#endif
diff --git a/Core/Src/main.c b/Core/Src/main.c
index 8b65122..2378de7 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -340,7 +340,7 @@ static void MX_GPIO_Init(void)
 
   /*Configure GPIO pins : IN0_Pin IN1_Pin */
   GPIO_InitStruct.Pin = IN0_Pin|IN1_Pin;
-  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
+  GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
   GPIO_InitStruct.Pull = GPIO_NOPULL;
   HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
diff --git a/Core/Src/stm32f1xx_it.c b/Core/Src/stm32f1xx_it.c
index 9a54c9e..c2cc2db 100644
--- a/Core/Src/stm32f1xx_it.c
+++ b/Core/Src/stm32f1xx_it.c
@@ -40,6 +40,7 @@
 #include "logger.h"
 #include "gpio.h"
 #include "can.h"
+#include "wiegand.h"
 
 /* USER CODE END 0 */
 
@@ -360,7 +361,19 @@ void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
 
 void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
 {
+  #ifdef WIEGAND_ENABLED
+  canpybara_wiegand_pin_pulse_interrupt(GPIO_Pin == IN1_Pin ? 1 : 0);
+  #warning Wiegand enabled: GPIO interrupt will be disabled
+  #else
   canpybara_gpio_interrupt(GPIO_Pin);
+  #endif
+}
+
+void HAL_SYSTICK_Callback(void)
+{
+  #ifdef WIEGAND_ENABLED
+  canpybara_wiegand_systick_interrupt();
+  #endif
 }
 
 /* USER CODE END 1 */
diff --git a/Core/Src/wiegand.c b/Core/Src/wiegand.c
index e0c92d6..795e4ec 100644
--- a/Core/Src/wiegand.c
+++ b/Core/Src/wiegand.c
@@ -1,9 +1,11 @@
 #include <stdint.h>
 
-int wiegand_position;
-uint32_t wiegand_buffer;
+#include "logger.h"
+#include "wiegand.h"
 
-#define WIEGAND_BUFFER_BIT_LENGTH sizeof(wiegand_buffer)*8
+unsigned int wiegand_position;
+uint32_t wiegand_buffer;
+uint32_t wiegand_timeout;
 
 void canpybara_wiegand_reset(void)
 {
@@ -11,11 +13,53 @@ void canpybara_wiegand_reset(void)
 	wiegand_buffer = 0;
 }
 
+void canpybara_wiegand_process_card(void)
+{
+
+}
+
+void canpybara_wiegand_process_keypress(void)
+{
+
+}
+
+void canpybara_wiegand_process_scan(void)
+{
+	switch(wiegand_position)
+	{
+		case WIEGAND_CARD_LENGTH:
+			canpybara_wiegand_process_card();
+			break;
+		case WIEGAND_KEYPRESS_LENGTH:
+			canpybara_wiegand_process_keypress();
+			break;
+		default:
+			LOG("Unknown WIEGAND message");
+	}
+}
 
-void canpybara_wiegand_pin_pulse(int bit)
+void canpybara_wiegand_pin_pulse_interrupt(int bit)
 {
 	wiegand_buffer |= bit << (WIEGAND_BUFFER_BIT_LENGTH -1 - wiegand_position);
 	wiegand_position ++;
+
+	wiegand_timeout = 0;
+}
+
+void canpybara_wiegand_systick_interrupt(void)
+{
+	if(wiegand_timeout > WIEGAND_TIMEOUT)
+	{
+		if(wiegand_position)
+		{
+			canpybara_wiegand_process_scan();
+		}
+		canpybara_wiegand_reset();
+	}
+	else
+	{
+		wiegand_timeout ++;
+	}
 }
 
 
@@ -67,5 +111,3 @@ uint8_t canpybara_wiegand_is_valid(void)
 
 	return 1;
 }
-
-
diff --git a/Makefile b/Makefile
index be98b7b..326a08d 100644
--- a/Makefile
+++ b/Makefile
@@ -60,6 +60,7 @@ Core/Src/test.c \
 Core/Src/can.c \
 Core/Src/gpio.c \
 Core/Src/version.c \
+Core/Src/wiegand.c \
 
 # ASM sources
 ASM_SOURCES =  \
diff --git a/canpybara.ioc b/canpybara.ioc
index f6e36ac..d568ab3 100644
--- a/canpybara.ioc
+++ b/canpybara.ioc
@@ -128,12 +128,14 @@ PA6.Signal=GPIO_Input
 PA9.Locked=true
 PA9.Mode=Asynchronous
 PA9.Signal=USART1_TX
-PB0.GPIOParameters=GPIO_Label
+PB0.GPIOParameters=GPIO_Label,GPIO_ModeDefaultEXTI
 PB0.GPIO_Label=IN0
+PB0.GPIO_ModeDefaultEXTI=GPIO_MODE_IT_FALLING
 PB0.Locked=true
 PB0.Signal=GPXTI0
-PB1.GPIOParameters=GPIO_Label
+PB1.GPIOParameters=GPIO_Label,GPIO_ModeDefaultEXTI
 PB1.GPIO_Label=IN1
+PB1.GPIO_ModeDefaultEXTI=GPIO_MODE_IT_FALLING
 PB1.Locked=true
 PB1.Signal=GPXTI1
 PB10.GPIOParameters=GPIO_Label