Arduino_STM32/STM32F1/cores/maple/libmaple/adc_f1.c

/******************************************************************************
 * The MIT License
 *
 * Copyright (c) 2012 LeafLabs, LLC.
 * Copyright (c) 2010 Perry Hung.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *****************************************************************************/

/**
 * @file libmaple/stm32f1/adc.c
 * @author Marti Bolivar <mbolivar@leaflabs.com>,
 *         Perry Hung <perry@leaflabs.com>
 * @brief STM32F1 ADC support.
 */

#include <libmaple/adc.h>
#include <libmaple/gpio.h>
#include <libmaple/nvic.h>//Added by bubulindo. 

/*
 * Devices
 */

adc_dev adc1 = {
    .regs   = ADC1_BASE,
    .clk_id = RCC_ADC1,
    .handlers = {[3]=0}, //added by bubulindo. EOC, JEOC, AWD
    .irq_num = NVIC_ADC_1_2,
};
/** ADC1 device. */
adc_dev *ADC1 = &adc1;

adc_dev adc2 = {
    .regs   = ADC2_BASE,
    .clk_id = RCC_ADC2,
};
/** ADC2 device. */
adc_dev *ADC2 = &adc2;

#if defined(STM32_HIGH_DENSITY) || defined(STM32_XL_DENSITY)
adc_dev adc3 = {
    .regs   = ADC3_BASE,
    .clk_id = RCC_ADC3,
    .handlers = {[3]=0}, //added by bubulindo. EOC, JEOC, AWD
    .irq_num = NVIC_ADC3,//added by bubulindo. 
};
/** ADC3 device. */
adc_dev *ADC3 = &adc3;
#endif


/*
    adc irq routine. 
    Added by bubulindo. 
*/
__weak void __irq_adc() {
    //get status
    uint32 adc_sr = ADC1->regs->SR;
//End Of Conversion
    if (adc_sr & (1U << ADC_SR_EOC_BIT)) {
      ADC1->regs->SR &= ~(1<<ADC_SR_EOC_BIT);
      void (*handler)(void) = ADC1->handlers[ADC_EOC];
      if (handler) {
        handler();
      }
    }
//Injected End Of Conversion
    if (adc_sr & (1U << ADC_SR_JEOC_BIT)) {
      ADC1->regs->SR &= ~(1<<ADC_SR_JEOC_BIT);
      void (*handler)(void) = ADC1->handlers[ADC_JEOC];
      if (handler) {
        handler();
      }
    }
//Analog Watchdog
    if (adc_sr & (1U << ADC_SR_AWD_BIT)) {
      ADC1->regs->SR &= ~(1<<ADC_SR_AWD_BIT);
      void (*handler)(void) = ADC1->handlers[ADC_AWD];
      if (handler) {
        handler();
      }
    }
};//end of adc irq


/*
    ADC3 IRQ handler. 
    added by bubulindo
*/
#if defined(STM32_HIGH_DENSITY) || defined(STM32_XL_DENSITY)
__weak void __irq_adc3() {
    //get status
    uint32 adc_sr = ADC3->regs->SR;
//End Of Conversion
    if (adc_sr & (1U << ADC_SR_EOC_BIT)) {
      ADC3->regs->SR &= ~(1<<ADC_SR_EOC_BIT);
      void (*handler)(void) = ADC3->handlers[ADC_EOC];
      if (handler) {
        handler();
      }
    }
//Injected End Of Conversion
    if (adc_sr & (1U << ADC_SR_JEOC_BIT)) {
      ADC3->regs->SR &= ~(1<<ADC_SR_JEOC_BIT);
      void (*handler)(void) = ADC3->handlers[ADC_JEOC];
      if (handler) {
        handler();
      }
    }
//Analog Watchdog
    if (adc_sr & (1U << ADC_SR_AWD_BIT)) {
      ADC3->regs->SR &= ~(1<<ADC_SR_AWD_BIT);
      void (*handler)(void) = ADC3->handlers[ADC_AWD];
      if (handler) {
        handler();
      }
    }
};//end of ADC3 irq
#endif

/*
    enable interrupts on the ADC: 
    use ADC_EOC, ADC_JEOC, ADC_AWD
    This will set up the interrupt bit in the ADC as well as in the NVIC.
    added by bubulindo
*/
void adc_enable_irq(adc_dev* dev, uint8 interrupt) {//ADC1 for now.
  dev->regs->CR1 |= (1U<<(interrupt +ADC_CR1_EOCIE_BIT));
  nvic_irq_enable(dev->irq_num);
  }

/*
    attach interrupt functionality for ADC
    use ADC_EOC, ADC_JEOC, ADC_AWD
    added by bubulindo
*/

void adc_attach_interrupt(adc_dev *dev,
                            uint8 interrupt, 
                            voidFuncPtr handler) {
    dev->handlers[interrupt] = handler;
    adc_enable_irq(dev, interrupt);
    //enable_irq(dev, interrupt); //I need to create this function. to enable NVIC
    //    nvic_irq_enable()
    }

/*
 * STM32F1 routines
 */

/**
 * @brief Calibrate an ADC peripheral
 *
 * Availability: STM32F1.
 *
 * @param dev adc device
 */
void adc_calibrate(adc_dev *dev) {
    __IO uint32 *rstcal_bit = bb_perip(&(dev->regs->CR2), 3);
    __IO uint32 *cal_bit = bb_perip(&(dev->regs->CR2), 2);

    *rstcal_bit = 1;
    while (*rstcal_bit)
        ;

    *cal_bit = 1;
    while (*cal_bit)
        ;
}

/*
 * Common routines
 */

void adc_set_prescaler(adc_prescaler pre) {
    rcc_set_prescaler(RCC_PRESCALER_ADC, (uint32)pre);
}

void adc_foreach(void (*fn)(adc_dev*)) {
    fn(ADC1);
    fn(ADC2);
#if defined(STM32_HIGH_DENSITY) || defined(STM32_XL_DENSITY)
    fn(ADC3);
#endif
}

void adc_config_gpio(adc_dev *ignored __attribute__((unused)), gpio_dev *gdev, uint8 bit) {
    gpio_set_mode(gdev, bit, GPIO_INPUT_ANALOG);
}

void adc_enable_single_swstart(adc_dev *dev) {
    adc_init(dev);
    adc_set_extsel(dev, ADC_SWSTART);
    adc_set_exttrig(dev, 1);
    adc_enable(dev);
    adc_calibrate(dev);
}