STM32F4 TIM8 complementary

[zarkscon]

Posted on December 26, 2014 at 12:29

Hello, I can't figure out why my code doesn't work! I've worked with TIM1 and everything works fine but when I change to TIM8, PC6 and PC7 are always on and the complementaries always off. Please help me out and happy holidays!

/* Includes ------------------------------------------------------------------*/
#include ''stm32f4xx.h''
#include ''stm32f4xx_gpio.h''
#include ''stm32f4xx_rcc.h''
#include ''stm32f4xx_tim.h''
#include ''misc.h''
/* Private typedef -----------------------------------------------------------*/
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
/* Private define ------------------------------------------------------------*/
#define frequency 42500 /* output frequency 42500 KHz */
#define f1 1/2 /* phase shift 90 degrees */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
int TimerPeriod = 0;
/* Private function prototypes -----------------------------------------------*/
void TIM_Config(void);
/* Private functions ---------------------------------------------------------*/
/**
* Main program
*/
int main(void)
{
/* TIM8 Configuration */
TIM_Config();
/* Compute the value to be set in ARR register to generate the desired signal frequency */
TimerPeriod = ((SystemCoreClock/2) / frequency) - 1;
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);
/* Channel 1 and 2 Configuration in Toggle mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_Pulse = (TimerPeriod/6)+ (TimerPeriod * f1);
TIM_OC1Init(TIM8, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = (TimerPeriod/6) ;
TIM_OC2Init(TIM8, &TIM_OCInitStructure);
/* Automatic Output enable, Break, dead time and lock configuration*/
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
TIM_BDTRInitStructure.TIM_DeadTime = 25; ///////// the right value for 250ns delay ////////
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM8, &TIM_BDTRInitStructure);
/* TIM8 counter enable */
TIM_Cmd(TIM8, ENABLE);
/* Main Output Enable */
TIM_CtrlPWMOutputs(TIM8, ENABLE);
while (1)
{
}
}
/**
* Configure the TIM8 Pins.
*/
void TIM_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* GPIOA, GPIOB and GPIOC clocks enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC, ENABLE);
/* TIM8 clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);
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_NOPULL;
/*GPIOA Configuration: Channel 1N and BKIN as alternate function push-pull*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* GPIOA Configuration: Channel 1 and 2 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* GPIOB Configuration: Channel 2N as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Connect TIM pins to AF1 */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_TIM8);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_TIM8);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_TIM8);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_TIM8);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_TIM8);
}

#stm32 #discovery #stm32f4

[waclawek.jan]

Posted on December 29, 2014 at 09:57

I don't speak the ''library'', but what happens if you don't enable TIMx_BDTR,AOE and directly enable TIMx_BDTR.MOE?

Btw why in ''Evaluation Tools'' subforum? JW

[zarkscon]

Posted on December 29, 2014 at 10:46

It's the classic CMSIS lib using CooCox. I can't set TIMx_BDTR.MOE. The only options I have are ''TIM_OSSRState'' ''TIM_OSSIState'' ''TIM_LOCKLevel'' ''TIM_DeadTime'' ''TIM_Break'' ''TIM_BreakPolarity'' and ''TIM_AutomaticOutput''. The thing is nothing works with TIM8. Not even a simple PWM. Why noone has ever made a program with TIM8? This program works great with TIM1 though, and TIM8 should work great too since they are identical.

I posted also on STM32 subforum after this. Thanks for the reply. Plz make a program with TIM8 and let me know if you can.