void XCLK_ON(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// Output HSE clock on MCO2 pin(PC9) ****************************************/
// Enable the GPIOA peripheral
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
// Connect MCO2 pin to AF0
// Connect to AF0 is default after reset
GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF_MCO);
// Configure MCO1 pin(PC9) in alternate function
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
// HSE clock selected to output on MCO2 pin(PC9)
#if HSE_VALUE == 8000000
RCC_MCO2Config(RCC_MCO2Source_HSE, RCC_MCO2Div_1);
#elif HSE_VALUE == 25000000
RCC_MCO2Config(RCC_MCO2Source_HSE, RCC_MCO2Div_4);
#endif
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
files before to branch to application main.
To reconfigure the default setting of SystemInit() function,
refer to system_stm32f4xx.c file */
/* SysTick end of count event each 10ms */
RCC_GetClocksFreq(&RCC_Clocks);
SysTick_Config(RCC_Clocks.HCLK_Frequency / 100);
/* Add your application code here */
/* Insert 50 ms delay */
Delay(5);
/* Output HSE clock on MCO1 pin(PA8) ****************************************/
/* Enable the GPIOA peripheral */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* Configure MCO1 pin(PA8) in alternate function */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* HSE clock selected to output on MCO1 pin(PA8)*/
RCC_MCO1Config(RCC_MCO1Source_HSE, RCC_MCO1Div_1);
/* Output SYSCLK/4 clock on MCO2 pin(PC9) ***********************************/
/* Enable the GPIOACperipheral */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
/* Configure MCO2 pin(PC9) in alternate function */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* SYSCLK/4 clock selected to output on MCO2 pin(PC9)*/
RCC_MCO2Config(RCC_MCO2Source_SYSCLK, RCC_MCO2Div_4);
/* Infinite loop */
while (1)
{
}
}
/**
* @brief Output System Clock on MCO2
* @param None
* @retval None
*/
void MCO2_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Config MCO2 PC9 to Alternate function */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF_MCO);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
/* QSPI CLK pin configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIOC, &GPIO_InitStructure);
RCC_MCO2Config(RCC_MCO2Source_SYSCLK, RCC_MCO2Div_5);
}
int main(void)
{
/* Test Git */
GPIO_InitTypeDef GPIO_InitStructure;
RCC_ClocksTypeDef RCC_ClockFreq;
uint32_t i=0;
SystemInit();
/* This function fills the RCC_ClockFreq structure with the current
frequencies of different on chip clocks (for debug purpose) **************/
RCC_GetClocksFreq(&RCC_ClockFreq);
/* Output HSE clock on MCO1 pin(PA8) ****************************************/
/* Enable the GPIOA peripheral */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* Configure MCO1 pin(PA8) in alternate function */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* HSE clock selected to output on MCO1 pin(PA8)*/
RCC_MCO1Config(RCC_MCO1Source_HSE, RCC_MCO1Div_1);
/* Output SYS clock on MCO2 pin(Pc9) ****************************************/
/* Enable the GPIOC peripheral */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
/* Configure MCO1 pin(PA8) in alternate function */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* HSE clock selected to output on MCO1 pin(PC9)*/
RCC_MCO2Config(RCC_MCO2Source_SYSCLK, RCC_MCO2Div_1);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOD, &GPIO_InitStructure);
while(1)
{
GPIOD->BSRRH = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIOD->BSRRL = GPIO_Pin_12;
for(i=0;i<1000000;i++);
GPIOD->BSRRH = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIOD->BSRRL = GPIO_Pin_13;
for(i=0;i<1000000;i++);
GPIOD->BSRRH = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIOD->BSRRL = GPIO_Pin_14;
for(i=0;i<1000000;i++);
GPIOD->BSRRH = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIOD->BSRRL = GPIO_Pin_15;
for(i=0;i<1000000;i++);
}
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_ClocksTypeDef RCC_ClockFreq;
/*!< 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
*/
/* Initialize LEDs mounted on STM32F4-Discovery board ***************************/
STM_EVAL_LEDInit(LED4);
STM_EVAL_LEDInit(LED3);
STM_EVAL_LEDInit(LED5);
STM_EVAL_LEDInit(LED6);
/* Turn on LED4 and LED5 */
STM_EVAL_LEDOn(LED4);
STM_EVAL_LEDOn(LED5);
/* This function fills the RCC_ClockFreq structure with the current
frequencies of different on chip clocks (for debug purpose) **************/
RCC_GetClocksFreq(&RCC_ClockFreq);
/* Enable Clock Security System(CSS): this will generate an NMI exception
when HSE clock fails *****************************************************/
RCC_ClockSecuritySystemCmd(ENABLE);
/* Enable and configure RCC global IRQ channel, will be used to manage HSE ready
and PLL ready interrupts.
These interrupts are enabled in stm32f4xx_it.c file **********************/
NVIC_InitStructure.NVIC_IRQChannel = RCC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Output clock on MCO2 pin(PC9) ****************************************/
/* Enable the GPIOC peripheral */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
/* Configure MCO2 pin(PC9) in alternate function */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* System clock selected to output on MCO2 pin(PC9)*/
RCC_MCO2Config(RCC_MCO2Source_SYSCLK, RCC_MCO2Div_2);
while (1)
{
/* Toggle LED3 and LED6 */
STM_EVAL_LEDToggle(LED3);
STM_EVAL_LEDToggle(LED6);
/* Insert a delay */
Delay(0x7FFFF);
/* Toggle LED4 and LED5 */
STM_EVAL_LEDToggle(LED4);
STM_EVAL_LEDToggle(LED5);
/* Insert a delay */
Delay(0x7FFFF);
}
}
