Lab 4-2 v.1 DEMO

/* Includes ------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "stm32f10x.h"
#include "stm32f10x_conf.h"
#include "stm32f10x_rcc.h"
#include<stm32f10x_adc.h>
#include "stm32f10x_tim.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_usart.h"

/* Declare function prototype ------------------------------------------------*/
void GPIO_init(void);
void Delay(__IO uint32_t nCount);
void USART_puts(USART_TypeDef* USARTx, volatile char *c);
void USART_init(uint32_t baudrate);
void Timer_init(void);

int main(void)
{

        /* Configure General-Purpose Input/Output */
        GPIO_init();
        /* Configure Timer 100Hz 1-tick is 10ms*/
        Timer_init();
        /* Configure UART2 Baudrate 115200, */
        USART_init(115200);

        USART_puts(USART1,"Program started\r\n");
    while(1)
    {
        int value1 = ADC_simple();


    }
}

void Delay(__IO uint32_t nCount)
{
  while(nCount--);
}


void USART_init(uint32_t baudrate)
{
        /* Enable the UART1 Clock */
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_USART1 |
                                RCC_APB2Periph_GPIOA, ENABLE);
        USART_InitTypeDef USART_InitStructure;
        USART_InitStructure.USART_BaudRate                              = baudrate;
        USART_InitStructure.USART_WordLength                    = USART_WordLength_8b;
        USART_InitStructure.USART_StopBits                              = USART_StopBits_1;
        USART_InitStructure.USART_Parity                                = USART_Parity_No;
        USART_InitStructure.USART_HardwareFlowControl   = USART_HardwareFlowControl_None;
        USART_InitStructure.USART_Mode                                  = USART_Mode_Tx;
        USART_Init(USART1, &USART_InitStructure);

        /* Enable USART1 */
        USART_Cmd(USART1, ENABLE);
}

void USART_puts(USART_TypeDef* USARTx, volatile char *c)
{
        while(*c){
                // wait until data register is empty
                while( !(USARTx->SR & 0x00000040) );
                USART_SendData(USARTx, *c);
                *c++;
        }
}

void GPIO_init(void)
{
        /* Enable the GPIO Clock */
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO , ENABLE);

        GPIO_InitTypeDef GPIO_InitStructure;
        /* Configure USART1 Tx (PA.02) as alternate function push-pull */
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Initial Input GPIO A pin 4 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

}

uint32_t micro(void) {

        /* return counter value form timer 3 */
        return (u32)TIM_GetCounter(TIM3);
}

void Timer_init(void) {

        /* Enable the Timer3 Clock */
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

        /* Initial Timer 3,
         * frequency counter 72MHz / 720 =  100 KHz,
         * set Autoreload value(ARR) = 0xFFFF(65535)
         */
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_TimeBaseStructure.TIM_Prescaler = 720 - 1 ;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0;
        TIM_TimeBaseStructure.TIM_Period = 0xFFFF - 1;
        TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

        /* TIM3 enable counter */
        TIM_Cmd(TIM3, ENABLE);

}

GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
int i,j;

/* Blink a LED, blink speed is set by ADC value */
void ADC_simple(void)
{
// init for GPIO (LED)
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_Out_PP;
        GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_8 | GPIO_Pin_9 ;       // two LED (guess on what pin!!)
        GPIO_Init(GPIOB, &GPIO_InitStructure);

// input of ADC (it doesn't seem to be needed, as default GPIO state is floating input)
        GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AIN;
        GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_1 ;            // that's ADC1 (PA1 on STM32)
        GPIO_Init(GPIOA, &GPIO_InitStructure);

//clock for ADC (max 14MHz --> 72/6=12MHz)
        RCC_ADCCLKConfig (RCC_PCLK2_Div6);
// enable ADC system clock
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

// define ADC config
        ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
        ADC_InitStructure.ADC_ScanConvMode = DISABLE;
        ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;      // we work in continuous sampling mode
        ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
        ADC_InitStructure.ADC_NbrOfChannel = 1;

        ADC_RegularChannelConfig(ADC1,ADC_Channel_1, 1,ADC_SampleTime_28Cycles5); // define regular conversion config
        ADC_Init ( ADC1, &ADC_InitStructure);   //set config of ADC1

// enable ADC
        ADC_Cmd (ADC1,ENABLE);  //enable ADC1

//      ADC calibration (optional, but recommended at power on)
        ADC_ResetCalibration(ADC1);     // Reset previous calibration
        while(ADC_GetResetCalibrationStatus(ADC1));
        ADC_StartCalibration(ADC1);     // Start new calibration (ADC must be off at that time)
        while(ADC_GetCalibrationStatus(ADC1));

// start conversion
        ADC_Cmd (ADC1,ENABLE);  //enable ADC1
        ADC_SoftwareStartConvCmd(ADC1, ENABLE); // start conversion (will be endless as we are in continuous mode)

// debug information
        RCC_ClocksTypeDef forTestOnly;
        RCC_GetClocksFreq(&forTestOnly);        //this could be used with debug to check to real speed of ADC clock

        j= 50000;
    while(1)
    {
        /*
        GPIO_WriteBit(GPIOB,GPIO_Pin_8,Bit_RESET);
                GPIO_WriteBit(GPIOB,GPIO_Pin_9,Bit_SET);
                for (i=0;i<j;i++);
                GPIO_WriteBit(GPIOB,GPIO_Pin_9,Bit_RESET);
                GPIO_WriteBit(GPIOB,GPIO_Pin_8,Bit_SET);
        */
                // adc is in free run, and we get the value asynchronously, this is not a really nice way of doing, but it work!
                j = ADC_GetConversionValue(ADC1) * 1000 ; // value from 0 to 4095000
                for (i=0;i<j;i++);
    }
}