/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f4xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f4xx.c file
*/
//initiate user button
//PB_Config();
STM_EVAL_PBInit(BUTTON_USER, BUTTON_MODE_EXTI);
//initiate LEDs and turn them on
LED_Config();
/* -----------------------------------------------------------------------
TIM3 Configuration: Output Compare Timing Mode:
In this example TIM3 input clock (TIM3CLK) is set to 2 * APB1 clock (PCLK1),
since APB1 prescaler is different from 1.
TIM3CLK = 2 * PCLK1
PCLK1 = HCLK / 4
=> TIM3CLK = HCLK / 2 = SystemCoreClock /2
To get TIM3 counter clock at 50 MHz, the prescaler is computed as follows:
Prescaler = (TIM3CLK / TIM3 counter clock) - 1
Prescaler = ((SystemCoreClock /2) /0.5 MHz) - 1
CC1 update rate = TIM3 counter clock / CCR1_Val = 10.0 Hz
==> Toggling frequency = 5 Hz
Note:
SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file.
Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
function to update SystemCoreClock variable value. Otherwise, any configuration
based on this variable will be incorrect.
----------------------------------------------------------------------- */
//=======================Configure and init Timer======================
/* Compute the prescaler value */
PrescalerValue = (uint16_t) ((SystemCoreClock / 2) / 500000) - 1; //configures clock speed at 500 KHz. Both Tim2 and Tim3 use the same prescsaler and therefore run at the same speed.
/* TIM Configuration */
TIM3_Config();
TIM2_Config();
// configure the output compare
TIM3_OCConfig();
TIM2_OCConfig();
/* TIM Interrupts enable */
TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);
TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);
/* TIM3 enable counter */
TIM_Cmd(TIM3, ENABLE);
TIM_Cmd(TIM2, ENABLE);
//======================================configure and init LCD ======================
/* LCD initiatization */
LCD_Init();
/* LCD Layer initiatization */
LCD_LayerInit();
/* Enable the LTDC */
LTDC_Cmd(ENABLE);
/* Set LCD foreground layer */
LCD_SetLayer(LCD_FOREGROUND_LAYER);
//================EEPROM init====================================
/* Unlock the Flash Program Erase controller */
FLASH_Unlock();
/* EEPROM Init */
EE_Init();
//============ Set up for random number generation==============
RNG_Config();
Ext_PushButton_Interrupt(); //configures external push button
//with the default font, LCD can display 12 lines of chars, they are LINE(0), LINE(1)...LINE(11)
//with the default font, LCD can display 15 columns, they are COLUMN(0)....COLUMN(14)
LCD_Clear(LCD_COLOR_WHITE); //change the background colour of LCD
//Display a string in one line, on the first line (line=0)
LCD_DisplayString(0, 2, (uint8_t *) "Best: "); //the line will not wrap
while (1){
if (UBPressed==1) { //press user button
if (pause==1){ //pause mode
randnum = ((RNG_GetRandomNumber()%2000)+1000); //generates a random number between 1000 and 3000
Pause_Random(randnum); //see below function to see how the pause is implemented
}
else { //measure time mode
TIM_ITConfig(TIM2, TIM_IT_CC1, DISABLE); //turns off timer 2
TIM_Cmd(TIM2, DISABLE);
time = timer; //gets user's time
if (initial == 1) { //sets initial best_time to first time
best_time = time;
initial = 0;
LCD_DisplayInt((uint16_t) 0, (uint16_t) 7, best_time);
}
LCD_DisplayString(2, 1, (uint8_t *) "Time: "); //print time
LCD_DisplayString(2, 7, (uint8_t *) " "); //clears line
LCD_DisplayInt((uint16_t) 2, (uint16_t) 7, time); //displays user's time
LCD_DisplayString(2, 11, (uint8_t *) "ms"); //print ms
if (time > 10 && time < best_time) { //set new best time
best_time = time;
LCD_DisplayString(0, 7, (uint8_t *) " "); //clears line
LCD_DisplayInt((uint16_t) 0, (uint16_t) 7, best_time);
}
TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE); //turns on timer 2
TIM_Cmd(TIM2, ENABLE);
pause = 1; //this makes it so that you can use the user button to repeat the cycle in case you don't have an external push button
}
UBPressed=0;
}
}
}
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f4xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f4xx.c file
*/
//initiate user button
PB_Config();
//initiate LEDs and turn them on
LED_Config();
/* -----------------------------------------------------------------------
TIM3 Configuration: Output Compare Timing Mode:
In this example TIM3 input clock (TIM3CLK) is set to 2 * APB1 clock (PCLK1),
since APB1 prescaler is different from 1.
TIM3CLK = 2 * PCLK1
PCLK1 = HCLK / 4
=> TIM3CLK = HCLK / 2 = SystemCoreClock /2
To get TIM3 counter clock at 50 MHz, the prescaler is computed as follows:
Prescaler = (TIM3CLK / TIM3 counter clock) - 1
Prescaler = ((SystemCoreClock /2) /50 MHz) - 1
CC1 update rate = TIM3 counter clock / CCR1_Val = 9.154 Hz
==> Toggling frequency = 4.57 Hz
Note:
SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file.
Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
function to update SystemCoreClock variable value. Otherwise, any configuration
based on this variable will be incorrect.
----------------------------------------------------------------------- */
//=======================Configure and init Timer======================
/* Compute the prescaler value */
PrescalerValue = (uint16_t) ((SystemCoreClock / 2) / 200000) - 1;
/* TIM Configuration */
TIM2_Config();
// configure the output compare
TIM2_OCConfig();
/* TIM Interrupts enable */
TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);
/* TIM3 enable counter */
TIM_Cmd(TIM2, ENABLE);
while (1){
if (UBPressed==1) {
STM_EVAL_LEDOff(LED3);
STM_EVAL_LEDOff(LED4);
hardwareBlinking();
UBPressed=0;
}
}
}
