Posted on June 26, 2015 at 19:57Good Evening all,
I am new to Embedded Programming. I am using STM32f407vgt6 discovery board for programming. I am using HAL functions for setting up the SYSCLK and BUS frequencies.
In this program , after one presses USER button , LED should blink.
LED is blinking normally in case I don't use HAL libraries.
But after I have set the clock speed using HAL libraries , the user button does not work.
Could someone please help me in finding why the user button PA0 does not function ?
Here is my code (I am using CooCox IDE) :
//&sharpinclude ''stm32f4xx.h''
//&sharpinclude ''stm32f407xx.h''
&sharpinclude ''stm32f4xx_hal.h''
&sharpdefine GPIO_TogglePE8() (GPIOE->ODR ^= (uint16_t)0x0100) /* Pin 8 selected */
uint32_t sysclockfreq1;
uint32_t HCLK11;
uint32_t PCLK11;
uint32_t PCLK21;
TIM_HandleTypeDef htim5;
void SystemClock_Config(void);
int main(void)
{
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
// Debug Purpose
sysclockfreq1=HAL_RCC_GetSysClockFreq();
HCLK11=HAL_RCC_GetHCLKFreq();
PCLK11=HAL_RCC_GetPCLK1Freq();
PCLK21=HAL_RCC_GetPCLK2Freq();
RCC->AHB1ENR |= 0x0019; // Enable clock for GPIOE & GPIOD & GPIOA
RCC->APB1ENR |= 0x00000008; // Enable Clock for Timer 5
GPIOE->MODER |= 0x00010000; // Output pin for time mark at port E bit 8
GPIOD->MODER |= 0x04000000; // Output pin for PD13 LD3 Orange
GPIOA->MODER |= 0x00000000; // Input pin for reading User Button PA0
while(!(GPIOA->IDR & 0x01)); //wait when PA0=0
GPIOD->ODR |= 0x2000;// The program control does not reach this line even after pressing the user button ( But during debugging the control is coming here)
HAL_NVIC_EnableIRQ(TIM5_IRQn); // Enable IRQ for TIM5 in NVIC. TIM5_IRQn present in stm32f407xx.h
TIM5->ARR = 8400; // Auto Reload Register value => 0.1 ms
TIM5->PSC = 9; // => 1 ms
TIM5->DIER |= 0x0001; // DMA/IRQ Enable Register - enable IRQ on update
TIM5->CR1 |= 0x0001; // Enable Counting
HAL_TIM_IRQHandler(&htim5);
while(1)
{
//GPIOD->ODR |= 0x2000;
}
}
void SystemClock_Config(void)
{
// Enabling the external crystal Clock
// Enable HSE Oscillator and Activate PLL with HSE as source
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;
//__PWR_CLK_ENABLE(); //This is to enable access to the RTC Domain and RTC registers
//__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 8;
RCC_OscInitStruct.PLL.PLLN = 336;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 4;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
if (HAL_RCC_OscConfig(&RCC_OscInitStruct)== HAL_OK)
{
// do printf. Could also turn on LED to indicate that HSE isn't running well
RCC->AHB1ENR = 0x0000008; // Enable Clock for PortD
GPIOD->MODER |= (1<<30); // Enable PortD Pin 15 as a digital output
GPIOD->ODR |= (1<<15); // Turn GPIO Pin 15 ON or Assert High
}
// Select PLL as system clock source and configure the HCLK, PCLK1
// Clocks dividers
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1
|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5)== HAL_OK)
{
// do printf.
RCC->AHB1ENR = 0x0000008; // Enable Clock for PortD
GPIOD->MODER |= (1<<28); // Enable PortD Pin 14 as a digital output
GPIOD->ODR |= (1<<14); // Turn GPIO Pin 14 ON or Assert High
}
}
#stm32
