Hello World example for interfacing up to four rotary encoders to the STM32's timer/counter hardware, without interrupts.
EncoderMspInitL0.cpp
00001 #include "mbed.h" 00002 /* 00003 * HAL_TIM_Encoder_MspInit() 00004 * Overrides the __weak function stub in stm32f4xx_hal_tim.h 00005 * 00006 * Edit the below for your preferred pin wiring & pullup/down 00007 * I have encoder common at 3V3, using GPIO_PULLDOWN on inputs. 00008 * Encoder A&B outputs connected directly to GPIOs. 00009 * 00010 */ 00011 00012 #ifdef TARGET_STM32L0 00013 void HAL_TIM_Encoder_MspInit(TIM_HandleTypeDef *htim) 00014 { 00015 GPIO_InitTypeDef GPIO_InitStruct; 00016 00017 if (htim->Instance == TIM2) { //PA0 PA1 = Nucleo A0 A1 00018 __TIM2_CLK_ENABLE(); 00019 __GPIOA_CLK_ENABLE(); 00020 GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1; 00021 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; 00022 GPIO_InitStruct.Pull = GPIO_PULLDOWN; 00023 GPIO_InitStruct.Speed = GPIO_SPEED_HIGH; 00024 GPIO_InitStruct.Alternate = GPIO_AF1_TIM2; 00025 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); 00026 } 00027 } 00028 #endif
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