From 176fff61776dbd44a99906e3f61d76269494c0c5 Mon Sep 17 00:00:00 2001
From: Imanol-Mikel Barba Sabariego <imanol@imanolbarba.net>
Date: Mon, 19 May 2014 00:10:58 +0000
Subject: [PATCH] 

---
 Project/applications/smartcities/i2c.c             | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 Project/applications/smartcities/include/i2c.h     |  7 +++++++
 Project/applications/smartcities/include/sensors.h |  9 ++++++---
 3 files changed, 65 insertions(+), 4 deletions(-)

diff --git a/Project/applications/smartcities/i2c.c b/Project/applications/smartcities/i2c.c
index 078cb59..ec1d47c 100644
--- a/Project/applications/smartcities/i2c.c
+++ b/Project/applications/smartcities/i2c.c
@@ -1,5 +1,4 @@
 #include "i2c.h"
-#include "libwismart.h"
 
 void I2C_init(void)
 {
@@ -110,6 +109,58 @@ void I2C_stop(I2C_TypeDef* I2Cx)
 	}
 }
 
+uint8_t I2C_check(I2C_TypeDef* I2Cx, uint8_t address)
+{
+	printf("I2C busy...\r\n");
+	while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY))
+	{
+		// wait until I2C1 is not busy any more
+	}
+	printf("I2C ready...\r\n");
+	I2C_GenerateSTART(I2Cx, ENABLE);
+	printf("START RELEASED...\r\n");
+	while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT))
+	{
+		// wait for I2C1 EV5 --> Slave has acknowledged start condition
+	}
+	printf("Probing address %x ...\r\n",address);
+	I2C_Send7bitAddress(I2Cx, address, I2C_Direction_Transmitter);
+	chThdSleepMilliseconds(SCAN_TIMEOUT);
+	if(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
+	{
+		printf("I2C address not detected: %x\r\n", address);
+		return 1;
+	}
+	printf("I2C address detected: %x\r\n", address);
+	I2C_write(I2C1,0x00);
+	I2C_stop(I2C1);
+	return 0;
+	/*while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
+	{
+		// wait for I2Cx EV6, check if Slave has acknowledged Master receiver mode
+	}*/
+}
+
+void I2C_scan(uint8_t *addresses)
+{
+	uint8_t sensors[TOTAL_SENSORS] = {DISTANCE_ADDR,LIGHT_ADDR,PRESSURE_ADDR,HUMIDITY_TEMP_ADDR};
+	uint8_t i, j = 0;
+	for(i = 0; i < TOTAL_SENSORS; i++)
+	{
+		if(!I2C_check(I2C1,sensors[i] << 1))
+		{
+			printf("adding...\r\n");
+			addresses[j++] = sensors[i];
+		}
+		else
+		{
+			I2C_SoftwareResetCmd(I2C1, ENABLE);
+			I2C_DeInit(I2C1);
+			I2C_init();
+		}
+	}
+}
+
 /* SAMPLE CODE BMP-085
  *
   	uint16_t received_data;
diff --git a/Project/applications/smartcities/include/i2c.h b/Project/applications/smartcities/include/i2c.h
index 130c837..b448ade 100644
--- a/Project/applications/smartcities/include/i2c.h
+++ b/Project/applications/smartcities/include/i2c.h
@@ -4,6 +4,10 @@
 #include "stm32f10x.h"
 #include "stm32f10x_i2c.h"
 #include "stm32f10x_gpio.h"
+#include "sensors.h"
+#include "libwismart.h"
+
+#define SCAN_TIMEOUT 100
 
 void I2C_init(void);
 void I2C_start(I2C_TypeDef* I2Cx, uint8_t address, uint8_t direction);
@@ -11,6 +15,9 @@ void I2C_stop(I2C_TypeDef* I2Cx);
 void I2C_write(I2C_TypeDef* I2Cx, uint8_t data);
 uint8_t I2C_read_ack(I2C_TypeDef* I2Cx);
 uint8_t I2C_read_nack(I2C_TypeDef* I2Cx);
+void I2C_scan(uint8_t *addresses);
+uint8_t I2C_check(I2C_TypeDef* I2Cx, uint8_t address);
+
 
 #endif
 
diff --git a/Project/applications/smartcities/include/sensors.h b/Project/applications/smartcities/include/sensors.h
index 6f09c80..8818c27 100644
--- a/Project/applications/smartcities/include/sensors.h
+++ b/Project/applications/smartcities/include/sensors.h
@@ -8,9 +8,12 @@
 #include "module.h"
 //#include "json.h"
 
-#define		LIGHT_ADDR		0x39
-#define		DISTANCE_ADDR	0x01
-#define		PRESSURE_ADDR	0x77
+#define		LIGHT_ADDR			0x39
+#define		DISTANCE_ADDR		0x01
+#define		PRESSURE_ADDR		0x77
+#define		HUMIDITY_TEMP_ADDR	0x00
+//REMEMBER TO UPDATE I2C_scan ROUTINE WITH EACH NEW SENSOR!!!!
+#define		TOTAL_SENSORS		4
 
 typedef struct {
   uint8_t ID;
--
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