PWM not work by using TIM10_CH1

[blacksu6]

Posted on September 04, 2013 at 08:22

My platform's MCU is STM32f205.

I try to modify TIM10_PWMOutput example from STM32F2xx Standard Peripherals Firmware Library to generate one PWM signal by using TIM10_CH1function of pin PB8. But it doesn't work? Can somebody help me to fix this issue? please see the reference codes as below. int main(void) {   /* TIM Configuration */   TIM_Config();     /* ---------------------------------------------------------------------------     TIM10 Configuration: generate 1 PWM signal:          In this example TIM10 input clock (TIM10CLK) is set to 2 * APB2 clock (PCLK2),     since APB2 prescaler is different from 1.          TIM10CLK = 2 * PCLK2         PCLK2 = HCLK / 2       => TIM10CLK = HCLK = SystemCoreClock                To get TIM10 counter clock at 20 MHz, the prescaler is computed as follows:        Prescaler = (TIM10CLK / TIM10 counter clock) - 1        Prescaler = (SystemCoreClock /20 MHz) - 1                                                    To get TIM10 output clock at 30 KHz, the period (TIM10_ARR) is computed as follows:        ARR = (TIM10 counter clock / TIM10 output clock) - 1            = 665                        TIM10 Channel1 duty cycle = (TIM10_CCR1/ TIM10_ARR)* 100 = 50%     Note:      SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f2xx.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.       --------------------------------------------------------------------------- */      /* Compute the prescaler value */   PrescalerValue = (uint16_t) (SystemCoreClock / 20000000) - 1;   /* Time base configuration */   TIM_TimeBaseStructure.TIM_Period = 665;   TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;   TIM_TimeBaseStructure.TIM_ClockDivision = 0;   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   TIM_TimeBaseInit(TIM10, &TIM_TimeBaseStructure);   /* PWM1 Mode configuration: Channel1 */   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;   TIM_OCInitStructure.TIM_Pulse = CCR1_Val;   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;   TIM_OC1Init(TIM10, &TIM_OCInitStructure);   TIM_OC1PreloadConfig(TIM10, TIM_OCPreload_Enable);   TIM_ARRPreloadConfig(TIM10, ENABLE);   /* TIM10 enable counter */   TIM_Cmd(TIM10, ENABLE);   while (1)   {} } /**   * @brief  Configure the TIM10 Ouput Channels.   * @param  None   * @retval None   */ void TIM_Config(void) {   GPIO_InitTypeDef GPIO_InitStructure;     /* TIM10 clock enable */   RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM10, ENABLE);   /* GPIOF clock enable */   //RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);     /* GPIOF Configuration: TIM10 CH1 (PF6) */   //GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 ;     /* GPIOF Configuration: TIM10 CH1 (PB8) */   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 ;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;   //GPIO_Init(GPIOF, &GPIO_InitStructure);     GPIO_Init(GPIOB, &GPIO_InitStructure);   /* Connect TIM pins to AF3 */   //GPIO_PinAFConfig(GPIOF, GPIO_PinSource6, GPIO_AF_TIM10);     GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_TIM10); } #pwm-stm32-tim10

[Tesla DeLorean]

Posted on September 04, 2013 at 16:39

The following worked for me on an F4, should be directly portable to an F2

// STM32 PWM (TIM10 30KHz PB8) STM32F4 Discovery - sourcer32@gmail.com
#include ''stm32f4_discovery.h''
/**************************************************************************************/
void RCC_Configuration(void)
{
/* --------------------------- System Clocks Configuration -----------------*/
/* TIM10 clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM10, ENABLE);
/* GPIOB clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
}
/**************************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/*-------------------------- GPIO Configuration ----------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Connect TIM10 pins to AF */
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_TIM10);
}
/**************************************************************************************/
void TIM10_Configuration(void)
{
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
uint16_t Period;
Period = SystemCoreClock / 30000; // Accurate 30 KHz from 120 or 168 MHz
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_Period = Period - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM10, &TIM_TimeBaseStructure);
/* Enable TIM10 Preload register on ARR */
TIM_ARRPreloadConfig(TIM10, ENABLE);
/* TIM PWM1 Mode configuration */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = Period / 2; // 50%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
/* Output Compare PWM1 Mode configuration: Channel1 PB.8 */
TIM_OC1Init(TIM10, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM10, TIM_OCPreload_Enable);
/* TIM10 enable counter */
TIM_Cmd(TIM10, ENABLE);
}
/**************************************************************************************/
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
TIM10_Configuration();
while(1); // Don't want to exit
}