David Lowe / Nucleo_Hello_Encoder

Hello World example for interfacing up to four rotary encoders to the STM32's timer/counter hardware, without interrupts.

Dependencies:   mbed-dev

Encoder/EncoderMspInitF0.cpp

Committer:
gregeric
Date:
2015-01-10
Revision:
0:ee5cb967aa17
Child:
1:cd7b42c99ff8

File content as of revision 0:ee5cb967aa17:

#include "mbed.h"
/*
 * HAL_TIM_Encoder_MspInit()
 * Overrides the __weak function stub in stm32f4xx_hal_tim.h
 *
 * Edit the below for your preferred pin wiring & pullup/down
 * I have encoder common at 3V3, using GPIO_PULLDOWN on inputs.
 * Encoder A&B outputs connected directly to GPIOs.
 *
 * All Nucleos support encoders, from 030 up.
 * On 030, there's only TIM3 @ AF1 PA6 PA7 (D11 D12)
 */

#ifdef TARGET_STM32F0
void HAL_TIM_Encoder_MspInit(TIM_HandleTypeDef *htim)
{
    GPIO_InitTypeDef GPIO_InitStruct;

    if (htim->Instance == TIM3) { //PA6 PA7 = Nucleo D12 D11
        __TIM3_CLK_ENABLE();
        __GPIOA_CLK_ENABLE();
        GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Pull = GPIO_PULLDOWN;
        GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
        GPIO_InitStruct.Alternate = GPIO_AF1_TIM3;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    }
}
#endif