Posted on June 21, 2013 at 22:44I'm working on getting quadrature encoding working through either TIM1 or TIM8. I searched the past topics on this forum, but I can't tell how mine is different/ why it isn't working. I'm using USART to debug the count, and I'm consistently getting a counter value of 0, though I can tell my input is valid.
Can anyone see what i'm doing wrong in this code? Thanks so much for taking the time to look at it.
/*
* main.c
*
* Created on: Jun 20, 2013
*/
&sharpinclude ''main.h''
&sharpinclude ''common.h''
&sharpinclude ''usart.h''
&sharpinclude ''peripherals.h''
static void TIM_Config(void);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
uint32_t a=0;
uint16_t i;
int main(void)
{
/* Initialize USART2 */
USART2_Init(115200, TRUE);
printf(''\fUART2 initialized\n\r'');
TIM_Config();
/* TIM1 clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8 , ENABLE);
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1;
TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
//Configure the encoder interface
TIM_EncoderInterfaceConfig(TIM8, TIM_EncoderMode_TI12, TIM_ICPolarity_BothEdge, TIM_ICPolarity_BothEdge);
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);
TIM_ARRPreloadConfig(TIM8, ENABLE);
/* TIM1 counter enable */
TIM_Cmd(TIM8, ENABLE);
//Counter loop
while(1)
{
printf(''Counter: %d\n\r'', (uint16_t)(TIM1->CNT & 0x0000ffff));
for(i=0; i<30000; i++)
{
a++;
a = a%5;
}
}
return 0;
}
static void TIM_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* GPIOA, GPIOB and GPIOE Clocks enable */
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOC, ENABLE);
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);
//RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
//Configure pins
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_4); //C6 -TIM1_CH1
GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_4); //C7 TIM1_CH2
// GPIO_Init(GPIOC, &GPIO_InitStructure);
// GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_2); //C6 -TIM1_CH1
// GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_2); //C7 TIM1_CH2
}
&sharpifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf(''Wrong parameters value: file %s on line %d\r\n'', file, line) */
/* Infinite loop */
while (1)
{
}
}
&sharpendif
#input-capture #quadrature-encoder
