/**
******************************************************************************
* @file ADC2_example2\main.c
* @brief This file contains the main function for ADC2 example 2.
* @author STMicroelectronics, MCD Application Team
* @version 1.02
* @date 1-JUN-2009
******************************************************************************
*
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>© COPYRIGHT 2008 STMicroelectronics</center></h2>
* @image html **.bmp
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm8s.h"
/**
* @addtogroup ADC2_Example2
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ALL_LEDs ((u8)0x0F) // LEDs mask (EVAL board)
#define PEAK_FILTER 1500 // floating spot fall speed filter
/* Private macro -------------------------------------------------------------*/
#define switch_all_LEDs_on { GPIOH->ODR|= ALL_LEDs; }
#define switch_all_LEDs_off { GPIOH->ODR&=~ALL_LEDs; }
/* Private variables ---------------------------------------------------------*/
u8 temp_AD_L; // temporary registers for reading ADC result
u8 ADSampRdy; // flag for filed of samples ready
u8 AD_sample; // stored sample
u8 peak_memo; // variables for peak level detector
u16 peak_filt; // variables for peak level detector
/* Private function prototypes -----------------------------------------------*/
/**
* @brief Prepare data for four LED bar of signal and peak indicator
* @par Parameters:
* val: Level of the mesured signal [0-4]
* @retval 4 bits (low nibble) of the composite bar graph information
*/
u8 signal_and_peak_level(u8 val) { // set 4-level signal and peak indicator
u8 signal;
u8 peak;
switch(val) {
case 0: peak= 0; signal= 0; break; //set peak and signal levels
case 1: peak= 1; signal= 1; break;
case 2: peak= 2; signal= 3; break;
case 3: peak= 4; signal= 7; break;
case 4: peak= 8; signal= 15; break;
default: peak= signal= 15;
};
if(peak_filt == 0) { // slow fall of peak level indicator
if(peak_memo) {
peak_memo>>= 1;
peak_filt= PEAK_FILTER;
};
}
else
--peak_filt;
if(peak >= peak_memo) { // check the highest level value
peak_memo= peak; // and copy it to peak indicator
peak_filt= PEAK_FILTER; // with fall speed refresh
};
return (signal | peak_memo); // composite bar graph information
}
/* -------------------------------------------------------------------------- */
/**
* @brief Programable loop delay
* @par Parameters:
* wt: number of waiting loops
* @retval None
*/
void delay_loop(u8 wt) {
while(wt--);
}
/* -------------------------------------------------------------------------- */
/**
* @brief ADC interrupt service
* @par Parameters:
* None
* @retval None
*/
#ifdef _COSMIC_
@far @interrupt void ADC2_Interrupt (void) {
#else
void ADC2_Interrupt (void) interrupt 22 {
#endif
AD_sample= ADC2->DRH; // read conversion result (MSB first!)
temp_AD_L= ADC2->DRL; // an store it to AD_sample variable
ADC2->CSR&=~ADC2_CSR_EOC; // clear end of conversion flag
ADSampRdy= TRUE; // set sample ready flag for main loop
return;
}
/* Public functions ----------------------------------------------------------*/
/**
* @brief Validation firmware main entry point.
* @par Parameters:
* None
* @retval None
*/
void main(void) {
u8 leds;
// *** GIO INIT ***
GPIOH->ODR&=~ALL_LEDs; // LEDs - as push-pull outputs, all off
GPIOH->DDR|= ALL_LEDs; //
GPIOH->CR1|= ALL_LEDs;
GPIOF->CR1&=~4; // PF.3 as a floating input
GPIOF->DDR&=~4;
// *** ADC INITIALIZATION ***
ADC2->CSR= ADC2_CSR_EOCIE | (11 & ADC2_CSR_CH); // AD interrupt enable, channel 11
ADC2->CR1|= ADC2_CR1_CONT | ((7<<4) & ADC2_CR1_SPSEL); // continuous conversion mode, fmaster/18
ADC2->TDRH= 8; // disable Schmitt trigger on AD input 11
ADC2->TDRL= 0;
ADC2->CR1|= ADC2_CR1_ADON; // ADC on
delay_loop(20); // wait for stabilization (min 7 us)
ADC2->CR1|= ADC2_CR1_ADON;
ADSampRdy= FALSE; // init ADC variables
enableInterrupts(); // all interrupts enable
// *** MAIN LOOP ***
while (1) {
if (ADSampRdy == TRUE) { // Is ADC sample ready?
leds= signal_and_peak_level((u8)(((u16)AD_sample + 15) >> 6));
GPIOH->ODR&= leds; // LEDs settings in according with signal level
GPIOH->ODR|= leds;
ADSampRdy= FALSE;
};
};
}
/**
* @}
*/
/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/
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