raspiezo / Nucleo_L432KC_Quadrature_Decoder_with_ADC_and_DAC

A program to monitor some parameters for a motor

Dependencies:   mbed-dev BufferSerial

Thanks to David Lowe for https://developer.mbed.org/users/gregeric/code/Nucleo_Hello_Encoder/ which I adapted for the use of TIM2 32bit timer as an encoder reader on the Nucleo L432KC board.

Encoder/EncoderMspInitL4.cpp@2:958e9094b198, 2017-03-11 (annotated)

Committer:
tonnyleonard
Date:
Sat Mar 11 22:56:39 2017 +0000
Revision:
2:958e9094b198
Parent:
1:a611582bffa7 
System ticker on Nucleo L432KC board changed from TIM2 to TIM7, so that one may use TIM2 for a 32bit encoder counter.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tonnyleonard 0:789510d98ade 1 #include "mbed.h"
tonnyleonard 0:789510d98ade 2 /*
tonnyleonard 0:789510d98ade 3 * HAL_TIM_Encoder_MspInit()
tonnyleonard 0:789510d98ade 4 * Overrides the __weak function stub in stm32f4xx_hal_tim.h
tonnyleonard 0:789510d98ade 5 *
tonnyleonard 0:789510d98ade 6 * Edit the below for your preferred pin wiring & pullup/down
tonnyleonard 0:789510d98ade 7 * I have encoder common at 3V3, using GPIO_PULLDOWN on inputs.
tonnyleonard 0:789510d98ade 8 * Encoder A&B outputs connected directly to GPIOs.
tonnyleonard 0:789510d98ade 9 *
tonnyleonard 0:789510d98ade 10 * http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00108832.pdf
tonnyleonard 0:789510d98ade 11 * Table 15 has GPIOx AFx pinouts
tonnyleonard 0:789510d98ade 12 *
tonnyleonard 0:789510d98ade 13 * TIM1_CH1: AF1 @ PA8, PE9
tonnyleonard 0:789510d98ade 14 * TIM1_CH2: AF1 @ PA9, PE11
tonnyleonard 0:789510d98ade 15 *
tonnyleonard 0:789510d98ade 16 * TIM2_CH1: AF1 @ PA0, PA5, PA15
tonnyleonard 0:789510d98ade 17 * TIM2_CH2: AF1 @ PA1, PB3
tonnyleonard 0:789510d98ade 18 *
tonnyleonard 0:789510d98ade 19 */
tonnyleonard 2:958e9094b198 20
tonnyleonard 0:789510d98ade 21 #ifdef TARGET_STM32L4
tonnyleonard 0:789510d98ade 22 void HAL_TIM_Encoder_MspInit(TIM_HandleTypeDef *htim)
tonnyleonard 0:789510d98ade 23 {
tonnyleonard 0:789510d98ade 24 GPIO_InitTypeDef GPIO_InitStruct;
tonnyleonard 2:958e9094b198 25
tonnyleonard 1:a611582bffa7 26 if (htim->Instance == TIM1) { //PA8 PA9 = Nucleo D9 D1
tonnyleonard 0:789510d98ade 27 __TIM1_CLK_ENABLE();
tonnyleonard 0:789510d98ade 28 __GPIOA_CLK_ENABLE();
tonnyleonard 0:789510d98ade 29 GPIO_InitStruct.Pin = GPIO_PIN_8 | GPIO_PIN_9;
tonnyleonard 0:789510d98ade 30 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
tonnyleonard 0:789510d98ade 31 GPIO_InitStruct.Pull = GPIO_PULLDOWN;
tonnyleonard 0:789510d98ade 32 GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
tonnyleonard 0:789510d98ade 33 GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
tonnyleonard 0:789510d98ade 34 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
tonnyleonard 0:789510d98ade 35 }
tonnyleonard 0:789510d98ade 36 else if (htim->Instance == TIM2) { //PA0 PA1 = Nucleo A0 A1
tonnyleonard 0:789510d98ade 37 __TIM2_CLK_ENABLE();
tonnyleonard 0:789510d98ade 38 __GPIOA_CLK_ENABLE();
tonnyleonard 0:789510d98ade 39 GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1;
tonnyleonard 0:789510d98ade 40 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
tonnyleonard 0:789510d98ade 41 GPIO_InitStruct.Pull = GPIO_PULLDOWN;
tonnyleonard 0:789510d98ade 42 GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
tonnyleonard 0:789510d98ade 43 GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
tonnyleonard 0:789510d98ade 44 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
tonnyleonard 0:789510d98ade 45 }
tonnyleonard 0:789510d98ade 46 }
tonnyleonard 0:789510d98ade 47 #endif