Posted on December 29, 2015 at 16:00Hi all,
I've downloaded the following simple code in my STM32F3DISCOVERY but I don't see anything. Should be a sistem clock config problem?
In main.c:
&sharpinclude ''stm32f30x.h''
/***************************************/
void RCC_Configuration(void)
{
/* Enable GPIO clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Enable TIM3/4 clock */
RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM4, ENABLE);
}
/************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_10); // TIM4_CH1
GPIO_PinAFConfig(GPIOA, GPIO_PinSource12, GPIO_AF_10); // TIM4_CH2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12;
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;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/************************************/
void TIM_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1; // 72 to 1 MHz
TIM_TimeBaseStructure.TIM_Period = 10 - 1; // 1 MHz to 100 KHz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 10 / 4; // 25%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
TIM_OC2Init(TIM4, &TIM_OCInitStructure);
TIM_Cmd(TIM4, ENABLE);
}
/**************************************/
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
TIM_Configuration();
while(1); // Don't want to exit
}
and I've this in system_stm32f30x.c :
/* Select the PLL clock source */
//&sharpdefine PLL_SOURCE_HSI // HSI (~8MHz) used to clock the PLL, and the PLL is used as system clock source
//&sharpdefine PLL_SOURCE_HSE // HSE (8MHz) used to clock the PLL, and the PLL is used as system clock source
&sharpdefine PLL_SOURCE_HSE_BYPASS // HSE bypassed with an external clock (8MHz, coming from ST-Link) used to clock
Can you help me?
Thanks in advantage.
#pwm #stm32-mco-clock-output
