Imanol-Mikel Barba Sabariego / smartcities · Commits

Commit 502f62695f2fc34aa46e450e0f1a7f7a86081cdf

Authored by Imanol-Mikel Barba Sabariego
1 parent b5f7fce9

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Project/applications/smartcities/adc.c 0 → 100644
  View file @502f626
  1 +#include "adc.h"
  2 +
  3 +#define DBG(fmt,...) if(1){printf("[ADC] "fmt"\r\n", ##__VA_ARGS__);}else{({});}
  4 +
  5 +
  6 +#define ADC_MIN_VALUE (0)
  7 +#define ADC_MAX_VALUE (0xfff) /* 12-bit adc */
  8 +#define ADC_VREF_PLUS (3300) /* Vref+ is connected with Vdda (3.3v) */
  9 +#define ADC_VREF_MINUS (0) /* Vref- is connected with Vssa (0v) */
  10 +
  11 +#define ADCbatt ADC1
  12 +#define ADCbatt_RCC RCC_APB2Periph_ADC1 /* */
  13 +#define ADCbatt_DIVIDER RCC_PCLK2_Div4 /* Can be 2/4/6/8. PCLK2 runs at 32Mhz, and max ADC clock is 14Mhz */
  14 +#define ADCbatt_CHANNEL ADC_Channel_12 /* 0/17 */
  15 +#define ADCbatt_SAMPLETIME ADC_SampleTime_239Cycles5
  16 +#define ADCbatt_GPIO_PIN GPIO_Pin_2
  17 +#define ADCbatt_GPIO_PORT GPIOC
  18 +#define ADCbatt_GPIO_RCC RCC_APB2Periph_GPIOC
  19 +#define ADCbatt_GPIO_STR "PC2"
  20 +
  21 +#define ADCsound ADC1
  22 +#define ADCsound_RCC RCC_APB2Periph_ADC1 /* */
  23 +#define ADCsound_DIVIDER RCC_PCLK2_Div4 /* Can be 2/4/6/8. PCLK2 runs at 32Mhz, and max ADC clock is 14Mhz */
  24 +#define ADCsound_CHANNEL ADC_Channel_12 /* 0/17 */
  25 +#define ADCsound_SAMPLETIME ADC_SampleTime_239Cycles5
  26 +#define ADCsound_GPIO_PIN GPIO_Pin_2
  27 +#define ADCsound_GPIO_PORT GPIOC
  28 +#define ADCsound_GPIO_RCC RCC_APB2Periph_GPIOC
  29 +#define ADCsound_GPIO_STR "PC2"
  30 +
  31 +void adc_init()
  32 +{
  33 + adc_peripheralInit();
  34 +}
  35 +
  36 +uint32_t adc_process()
  37 +{
  38 + uint16_t adcRegisterValue;
  39 + uint32_t analogValue;
  40 +
  41 + adcRegisterValue = adc_read();
  42 +
  43 + /*
  44 + * Calculate the register value to volts
  45 + * 1. adcRegisterValue Range is [ADC_MIN_VALUE, ADC_MAX_VALUE]
  46 + * 2. analogValue Range is [ADC_VREF_MINUS, ADC_VREF_PLUS]
  47 + */
  48 + analogValue = ADC_VREF_MINUS + (((adcRegisterValue - ADC_MIN_VALUE)*(ADC_VREF_PLUS - ADC_VREF_MINUS))/(ADC_MAX_VALUE - ADC_MIN_VALUE));
  49 + DBG("Register value is %4u [%4u milliVolts are currently given to gpio %s]",adcRegisterValue, analogValue, ADCbatt_GPIO_STR);
  50 + return analogValue;
  51 +}
  52 +
  53 +void adc_peripheralInit()
  54 +{
  55 + GPIO_InitTypeDef GPIO_InitStructure;
  56 + ADC_InitTypeDef ADC_InitStructure;
  57 + RCC_APB2PeriphClockCmd(ADCbatt_GPIO_RCC, ENABLE);
  58 + GPIO_InitStructure.GPIO_Pin = ADCbatt_GPIO_PIN;
  59 + GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  60 + GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  61 + GPIO_Init(ADCbatt_GPIO_PORT, &GPIO_InitStructure);
  62 +
  63 +
  64 + /* Max ADC clk is 14mhz and because PCLK2 runs @32Mhz */
  65 + RCC_ADCCLKConfig(ADCbatt_DIVIDER);
  66 + /* Enable ADCbatt clock so that we can talk to it */
  67 + RCC_APB2PeriphClockCmd(ADCbatt_RCC, ENABLE);
  68 + /* Put everything back to power-on defaults */
  69 + ADC_DeInit(ADCbatt);
  70 +
  71 +
  72 + /* ADC1 and ADC2 operate independently */
  73 + ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
  74 + /* Disable the scan conversion so we do one at a time */
  75 + ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  76 + /* Don't do contimuous conversions - do them on demand */
  77 + ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  78 + /* Start conversin by software, not an external trigger */
  79 + ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
  80 + /* Conversions are 12 bit - put them in the lower 12 bits of the result */
  81 + ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  82 + /* Say how many channels would be used by the sequencer */
  83 + ADC_InitStructure.ADC_NbrOfChannel = 1;
  84 +
  85 + /* Now do the setup */
  86 + ADC_Init(ADCbatt, &ADC_InitStructure);
  87 + /* Enable ADCbatt */
  88 + ADC_Cmd(ADCbatt, ENABLE);
  89 +
  90 + /* Enable ADCbatt reset calibaration register */
  91 + ADC_ResetCalibration(ADCbatt);
  92 + /* Check the end of ADCbatt reset calibration register */
  93 + while(ADC_GetResetCalibrationStatus(ADCbatt));
  94 + /* Start ADCbatt calibaration */
  95 + ADC_StartCalibration(ADCbatt);
  96 + /* Check the end of ADC1 calibration */
  97 + while(ADC_GetCalibrationStatus(ADCbatt));
  98 +}
  99 +
  100 +uint16_t adc_read()
  101 +{
  102 + ADC_RegularChannelConfig(ADCbatt, ADCbatt_CHANNEL, 1, ADCbatt_SAMPLETIME);
  103 + /* Start the conversion */
  104 + ADC_SoftwareStartConvCmd(ADCbatt, ENABLE);
  105 + /* Wait until conversion completion */
  106 + while(ADC_GetFlagStatus(ADCbatt, ADC_FLAG_EOC) == RESET);
  107 + /* Get the conversion value */
  108 + return ADC_GetConversionValue(ADCbatt);
  109 +}
  110 +
  111 +
  112 +
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Project/applications/smartcities/adc.h 0 → 100644
  View file @502f626
  1 +#ifndef ADC_H
  2 +#define ADC_H
  3 +
  4 +#include "libwismart.h"
  5 +#include "ch.h"
  6 +
  7 +#include "stm32f10x_gpio.h"
  8 +#include "stm32f10x_adc.h"
  9 +
  10 +void adc_init(void);
  11 +uint32_t adc_process(void);
  12 +uint16_t adc_read(void);
  13 +void adc_peripheralInit(void);
  14 +
  15 +#endif
0 16 \ No newline at end of file
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