STM32f303 Output Compare

[arganasss]

Posted on May 09, 2014 at 15:48

Hello, i'd like to do output compare on four pins: PE13, PE9 (LEDS), PA10 and PA12. Everyone works except PA12. I tried to do that with TIM16 and TIM4 with no luck. And i reconfigured the channels, i understand how they are mapped to pins (datasheet). So maybe someone knows why this happens? Here is the code. Thanks for your help.

#include ''stm32f30x.h''TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;TIM_OCInitTypeDef TIM_OCInitStructure;GPIO_InitTypeDef GPIO_InitStructure;void Leds_config(void);void Timer_config(void);int main(void){  // Enable clocks for E  and A ports  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOE, ENABLE);  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);    Leds_config();  Timer_config();      while(1)  {  }}void Leds_config(void){  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_13; // use 9 and 10 pins port E  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // use alternate-function mode  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // High speed mode  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // Push-pull mode  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; // don't use pull up resistors  GPIO_Init(GPIOE, &GPIO_InitStructure); // write values to E port registers  GPIO_PinAFConfig(GPIOE, GPIO_PinSource9, GPIO_AF_2); // Connect timer1 to these IO pins  GPIO_PinAFConfig(GPIOE, GPIO_PinSource13, GPIO_AF_2);     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; // use 9 and 10 pins port E  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // pin is in output mode  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // High speed mode  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // Push-pull mode  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; // don't use pull up resistors  GPIO_Init(GPIOA, &GPIO_InitStructure); // write values to E port  GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_10);     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; // 12 pin of PA.  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // High speed mode  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // Push-pull mode  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; // don't use pull up resistors  GPIO_Init(GPIOA, &GPIO_InitStructure); // write values to A port  GPIO_PinAFConfig(GPIOA, GPIO_PinSource12, GPIO_AF_10); }void Timer_config(void){  TIM_TimeBaseInitStructure.TIM_Period = 500-1; // Pulse period = 500us.  TIM_TimeBaseInitStructure.TIM_Prescaler = 72-1; // Divide timer frequency 72Mhz/72Hz gives 1us ticks.  TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; // Count from zero to ARR value.  TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1; // Dont divide timer clock  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);    TIM_TimeBaseInitStructure.TIM_Period = 500-1; // Pulse period = 500us.  TIM_TimeBaseInitStructure.TIM_Prescaler = 72-1; // Divide timer frequency 72Mhz/72Hz gives 1us ticks.  TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; // Count from zero to ARR value.  TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1; // Dont divide timer clock  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);    TIM_TimeBaseInitStructure.TIM_Period = 500-1; // Pulse period = 500us.  TIM_TimeBaseInitStructure.TIM_Prescaler = 72-1; // Divide timer frequency 72Mhz/72Hz gives 1us ticks.  TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; // Count from zero to ARR value.  TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1; // Dont divide timer clock  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseInitStructure);      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  TIM_OCInitStructure.TIM_Pulse = 350;  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    TIM_OC1Init(TIM1, &TIM_OCInitStructure);  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable );    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  TIM_OCInitStructure.TIM_Pulse = 20;  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;    TIM_OC3Init(TIM1, &TIM_OCInitStructure);  TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable );    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  TIM_OCInitStructure.TIM_Pulse = 350;  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  TIM_OC4Init(TIM2, &TIM_OCInitStructure);  TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable );    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  TIM_OCInitStructure.TIM_Pulse = 150;  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  TIM_OC2Init(TIM4, &TIM_OCInitStructure);  TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable );    TIM_CtrlPWMOutputs(TIM1, ENABLE);  TIM_CtrlPWMOutputs(TIM2, ENABLE);  TIM_CtrlPWMOutputs(TIM4, ENABLE);  TIM_Cmd(TIM1, ENABLE );  TIM_Cmd(TIM2, ENABLE );  TIM_Cmd(TIM4, ENABLE);}

[Tesla DeLorean]

Posted on May 09, 2014 at 16:00

For the STM32F3-DISCO board observe that solder bridges SB21,22 need to be MADE for the signals PA11 & PA12 to reach the P2 header.

[arganasss]

Posted on May 09, 2014 at 16:03

Also tried to do this on some random pins on B port and it also was successfull, so maybe PA12 or PA11 interacts with something which is not allowed or acceptable?

[arganasss]

Posted on May 09, 2014 at 16:06

Heh. My lack of experience of not knowing where to look. I was concentrating on the program so much that i didn't even think about hardware. Thanks Clive, now it works.