From 502f62695f2fc34aa46e450e0f1a7f7a86081cdf Mon Sep 17 00:00:00 2001
From: Imanol-Mikel Barba Sabariego <imanol@imanolbarba.net>
Date: Tue, 20 May 2014 22:08:45 +0000
Subject: [PATCH] 

---
 Project/applications/smartcities/adc.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 Project/applications/smartcities/adc.h |  15 +++++++++++++++
 2 files changed, 127 insertions(+), 0 deletions(-)
 create mode 100644 Project/applications/smartcities/adc.c
 create mode 100644 Project/applications/smartcities/adc.h

diff --git a/Project/applications/smartcities/adc.c b/Project/applications/smartcities/adc.c
new file mode 100644
index 0000000..fb42fbc
--- /dev/null
+++ b/Project/applications/smartcities/adc.c
@@ -0,0 +1,112 @@
+#include "adc.h"
+
+#define DBG(fmt,...)          		if(1){printf("[ADC] "fmt"\r\n", ##__VA_ARGS__);}else{({});}
+
+
+#define ADC_MIN_VALUE		(0)
+#define ADC_MAX_VALUE		(0xfff) /* 12-bit adc */
+#define ADC_VREF_PLUS		(3300) 	/*  Vref+ is connected with Vdda (3.3v) */
+#define ADC_VREF_MINUS		(0) 	/*  Vref- is connected with Vssa (0v) */
+
+#define ADCbatt				ADC1
+#define ADCbatt_RCC			RCC_APB2Periph_ADC1			/* */
+#define ADCbatt_DIVIDER		RCC_PCLK2_Div4				/* Can be 2/4/6/8. PCLK2 runs at 32Mhz, and max ADC clock is 14Mhz */
+#define ADCbatt_CHANNEL 	ADC_Channel_12				/* 0/17 */
+#define ADCbatt_SAMPLETIME 	ADC_SampleTime_239Cycles5
+#define ADCbatt_GPIO_PIN	GPIO_Pin_2
+#define ADCbatt_GPIO_PORT	GPIOC
+#define ADCbatt_GPIO_RCC	RCC_APB2Periph_GPIOC
+#define ADCbatt_GPIO_STR	"PC2"
+
+#define ADCsound			ADC1
+#define ADCsound_RCC		RCC_APB2Periph_ADC1			/* */
+#define ADCsound_DIVIDER	RCC_PCLK2_Div4				/* Can be 2/4/6/8. PCLK2 runs at 32Mhz, and max ADC clock is 14Mhz */
+#define ADCsound_CHANNEL 	ADC_Channel_12				/* 0/17 */
+#define ADCsound_SAMPLETIME ADC_SampleTime_239Cycles5
+#define ADCsound_GPIO_PIN	GPIO_Pin_2
+#define ADCsound_GPIO_PORT	GPIOC
+#define ADCsound_GPIO_RCC	RCC_APB2Periph_GPIOC
+#define ADCsound_GPIO_STR	"PC2"
+
+void adc_init()
+{
+	adc_peripheralInit();
+}
+
+uint32_t adc_process()
+{
+	uint16_t adcRegisterValue;
+	uint32_t analogValue;
+
+	adcRegisterValue = adc_read();
+	
+	/*
+	* 	Calculate the register value to volts
+	*	1. adcRegisterValue 	Range is [ADC_MIN_VALUE, ADC_MAX_VALUE]
+	*	2. analogValue			Range is [ADC_VREF_MINUS, ADC_VREF_PLUS]	
+	*/
+	analogValue = ADC_VREF_MINUS + (((adcRegisterValue - ADC_MIN_VALUE)*(ADC_VREF_PLUS - ADC_VREF_MINUS))/(ADC_MAX_VALUE - ADC_MIN_VALUE));
+	DBG("Register value is %4u [%4u milliVolts are currently given to gpio %s]",adcRegisterValue, analogValue, ADCbatt_GPIO_STR);
+	return analogValue;
+}
+
+void adc_peripheralInit()
+{
+	GPIO_InitTypeDef  GPIO_InitStructure;
+	ADC_InitTypeDef  ADC_InitStructure;
+	RCC_APB2PeriphClockCmd(ADCbatt_GPIO_RCC, ENABLE);
+	GPIO_InitStructure.GPIO_Pin = ADCbatt_GPIO_PIN;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_Init(ADCbatt_GPIO_PORT, &GPIO_InitStructure);
+
+	
+	/* Max ADC clk is 14mhz and because PCLK2 runs @32Mhz */
+	RCC_ADCCLKConfig(ADCbatt_DIVIDER);
+	/* Enable ADCbatt clock so that we can talk to it */
+	RCC_APB2PeriphClockCmd(ADCbatt_RCC, ENABLE);
+	/* Put everything back to power-on defaults */
+	ADC_DeInit(ADCbatt);
+
+	
+	/* ADC1 and ADC2 operate independently */
+	ADC_InitStructure.ADC_Mode 					= ADC_Mode_Independent; 
+	/* Disable the scan conversion so we do one at a time */
+	ADC_InitStructure.ADC_ScanConvMode 			= DISABLE;
+	/* Don't do contimuous conversions - do them on demand */
+	ADC_InitStructure.ADC_ContinuousConvMode 	= DISABLE;
+	/* Start conversin by software, not an external trigger */
+	ADC_InitStructure.ADC_ExternalTrigConv 		= ADC_ExternalTrigConv_None;
+	/* Conversions are 12 bit - put them in the lower 12 bits of the result */
+	ADC_InitStructure.ADC_DataAlign 			= ADC_DataAlign_Right;
+	/* Say how many channels would be used by the sequencer */
+	ADC_InitStructure.ADC_NbrOfChannel 			= 1;
+
+	/* Now do the setup */
+	ADC_Init(ADCbatt, &ADC_InitStructure);
+	/* Enable ADCbatt */
+	ADC_Cmd(ADCbatt, ENABLE);
+
+	/* Enable ADCbatt reset calibaration register */
+	ADC_ResetCalibration(ADCbatt);
+	/* Check the end of ADCbatt reset calibration register */
+	while(ADC_GetResetCalibrationStatus(ADCbatt));
+	/* Start ADCbatt calibaration */
+	ADC_StartCalibration(ADCbatt);
+	/* Check the end of ADC1 calibration */
+	while(ADC_GetCalibrationStatus(ADCbatt));
+}
+
+uint16_t adc_read()
+{
+  ADC_RegularChannelConfig(ADCbatt, ADCbatt_CHANNEL, 1, ADCbatt_SAMPLETIME);
+  /* Start the conversion */
+  ADC_SoftwareStartConvCmd(ADCbatt, ENABLE);
+  /* Wait until conversion completion */
+  while(ADC_GetFlagStatus(ADCbatt, ADC_FLAG_EOC) == RESET);
+  /* Get the conversion value */
+  return ADC_GetConversionValue(ADCbatt);
+}
+
+
+
diff --git a/Project/applications/smartcities/adc.h b/Project/applications/smartcities/adc.h
new file mode 100644
index 0000000..aa31d46
--- /dev/null
+++ b/Project/applications/smartcities/adc.h
@@ -0,0 +1,15 @@
+#ifndef ADC_H
+#define ADC_H
+
+#include "libwismart.h"
+#include "ch.h"
+
+#include "stm32f10x_gpio.h"
+#include "stm32f10x_adc.h"
+
+void adc_init(void);
+uint32_t adc_process(void);
+uint16_t adc_read(void);
+void adc_peripheralInit(void);
+
+#endif
\ No newline at end of file
--
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