2015-04-11 01:07:36 -07:00
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/*
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2016-11-04 07:18:34 -07:00
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Copyright 2016 Benjamin Vedder benjamin@vedder.se
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2015-04-11 01:07:36 -07:00
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2016-11-04 07:18:34 -07:00
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This file is part of the VESC firmware.
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The VESC firmware is free software: you can redistribute it and/or modify
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2015-04-11 01:07:36 -07:00
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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2016-11-04 07:18:34 -07:00
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The VESC firmware is distributed in the hope that it will be useful,
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2015-04-11 01:07:36 -07:00
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "encoder.h"
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#include "ch.h"
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#include "hal.h"
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#include "stm32f4xx_conf.h"
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#include "hw.h"
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#include "mc_interface.h"
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2016-04-27 06:32:32 -07:00
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#include "utils.h"
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2019-03-30 14:05:53 -07:00
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#include "math.h"
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2016-04-27 06:32:32 -07:00
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// Defines
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#define AS5047P_READ_ANGLECOM (0x3FFF | 0x4000 | 0x8000) // This is just ones
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#define AS5047_SAMPLE_RATE_HZ 20000
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#define AD2S1205_SAMPLE_RATE_HZ 20000 //25MHz max spi clk
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#define SINCOS_SAMPLE_RATE_HZ 20000
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2019-04-02 06:37:15 -07:00
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#define SINCOS_MIN_AMPLITUDE 1.0 // sqrt(sin^2 + cos^2) has to be larger than this
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#define SINCOS_MAX_AMPLITUDE 1.65 // sqrt(sin^2 + cos^2) has to be smaller than this
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2016-06-27 08:29:09 -07:00
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#if AS5047_USE_HW_SPI_PINS
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#ifdef HW_SPI_DEV
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#define SPI_SW_MISO_GPIO HW_SPI_PORT_MISO
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#define SPI_SW_MISO_PIN HW_SPI_PIN_MISO
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#define SPI_SW_MOSI_GPIO HW_SPI_PORT_MOSI
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#define SPI_SW_MOSI_PIN HW_SPI_PIN_MOSI
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#define SPI_SW_SCK_GPIO HW_SPI_PORT_SCK
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#define SPI_SW_SCK_PIN HW_SPI_PIN_SCK
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#define SPI_SW_CS_GPIO HW_SPI_PORT_NSS
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#define SPI_SW_CS_PIN HW_SPI_PIN_NSS
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#else
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// Note: These values are hardcoded.
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#define SPI_SW_MISO_GPIO GPIOB
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#define SPI_SW_MISO_PIN 4
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#define SPI_SW_MOSI_GPIO GPIOB
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#define SPI_SW_MOSI_PIN 5
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#define SPI_SW_SCK_GPIO GPIOB
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#define SPI_SW_SCK_PIN 3
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#define SPI_SW_CS_GPIO GPIOB
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#define SPI_SW_CS_PIN 0
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#endif
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#else
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#define SPI_SW_MISO_GPIO HW_HALL_ENC_GPIO2
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#define SPI_SW_MISO_PIN HW_HALL_ENC_PIN2
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#define SPI_SW_SCK_GPIO HW_HALL_ENC_GPIO1
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#define SPI_SW_SCK_PIN HW_HALL_ENC_PIN1
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#define SPI_SW_CS_GPIO HW_HALL_ENC_GPIO3
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#define SPI_SW_CS_PIN HW_HALL_ENC_PIN3
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#endif
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// Private types
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typedef enum {
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ENCODER_MODE_NONE = 0,
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ENCODER_MODE_ABI,
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ENCODER_MODE_AS5047P_SPI,
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RESOLVER_MODE_AD2S1205,
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ENCODER_MODE_SINCOS
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} encoder_mode;
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2015-12-08 12:01:23 -08:00
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// Private variables
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static bool index_found = false;
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static uint32_t enc_counts = 10000;
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static encoder_mode mode = ENCODER_MODE_NONE;
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static float last_enc_angle = 0.0;
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uint16_t spi_val = 0;
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uint32_t spi_error_cnt = 0;
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float spi_error_rate = 0.0;
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2019-03-30 14:05:53 -07:00
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float sin_gain = 0.0;
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float sin_offset = 0.0;
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float cos_gain = 0.0;
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float cos_offset = 0.0;
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2019-04-01 04:30:27 -07:00
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float sincos_filter_constant = 0.0;
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uint32_t sincos_signal_below_min_error_cnt = 0;
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uint32_t sincos_signal_above_max_error_cnt = 0;
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float sincos_signal_low_error_rate = 0.0;
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float sincos_signal_above_max_error_rate = 0.0;
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2016-04-27 06:32:32 -07:00
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// Private functions
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static void spi_transfer(uint16_t *in_buf, const uint16_t *out_buf, int length);
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static void spi_begin(void);
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static void spi_end(void);
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static void spi_delay(void);
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2018-11-04 05:06:02 -08:00
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uint32_t encoder_spi_get_error_cnt(void) {
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return spi_error_cnt;
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}
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uint16_t encoder_spi_get_val(void) {
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return spi_val;
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}
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2019-01-29 10:16:15 -08:00
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float encoder_spi_get_error_rate(void) {
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return spi_error_rate;
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}
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2019-04-02 06:37:15 -07:00
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uint32_t encoder_sincos_get_signal_below_min_error_cnt(void) {
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return sincos_signal_below_min_error_cnt;
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}
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uint32_t encoder_sincos_get_signal_above_max_error_cnt(void) {
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return sincos_signal_above_max_error_cnt;
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}
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float encoder_sincos_get_signal_below_min_error_rate(void) {
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return sincos_signal_low_error_rate;
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}
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float encoder_sincos_get_signal_above_max_error_rate(void) {
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return sincos_signal_above_max_error_rate;
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}
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2016-04-27 06:32:32 -07:00
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void encoder_deinit(void) {
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nvicDisableVector(HW_ENC_EXTI_CH);
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nvicDisableVector(HW_ENC_TIM_ISR_CH);
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TIM_DeInit(HW_ENC_TIM);
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palSetPadMode(SPI_SW_MISO_GPIO, SPI_SW_MISO_PIN, PAL_MODE_INPUT_PULLUP);
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palSetPadMode(SPI_SW_SCK_GPIO, SPI_SW_SCK_PIN, PAL_MODE_INPUT_PULLUP);
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palSetPadMode(SPI_SW_CS_GPIO, SPI_SW_CS_PIN, PAL_MODE_INPUT_PULLUP);
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palSetPadMode(HW_HALL_ENC_GPIO1, HW_HALL_ENC_PIN1, PAL_MODE_INPUT_PULLUP);
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palSetPadMode(HW_HALL_ENC_GPIO2, HW_HALL_ENC_PIN2, PAL_MODE_INPUT_PULLUP);
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index_found = false;
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mode = ENCODER_MODE_NONE;
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last_enc_angle = 0.0;
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spi_error_rate = 0.0;
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sincos_signal_low_error_rate = 0.0;
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sincos_signal_above_max_error_rate = 0.0;
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}
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2016-04-27 06:32:32 -07:00
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void encoder_init_abi(uint32_t counts) {
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EXTI_InitTypeDef EXTI_InitStructure;
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2015-12-08 12:01:23 -08:00
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// Initialize variables
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index_found = false;
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enc_counts = counts;
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2016-11-04 07:18:34 -07:00
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palSetPadMode(HW_HALL_ENC_GPIO1, HW_HALL_ENC_PIN1, PAL_MODE_ALTERNATE(HW_ENC_TIM_AF));
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palSetPadMode(HW_HALL_ENC_GPIO2, HW_HALL_ENC_PIN2, PAL_MODE_ALTERNATE(HW_ENC_TIM_AF));
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// palSetPadMode(HW_HALL_ENC_GPIO3, HW_HALL_ENC_PIN3, PAL_MODE_ALTERNATE(HW_ENC_TIM_AF));
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// Enable timer clock
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HW_ENC_TIM_CLK_EN();
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// Enable SYSCFG clock
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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TIM_EncoderInterfaceConfig (HW_ENC_TIM, TIM_EncoderMode_TI12,
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TIM_ICPolarity_Rising,
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TIM_ICPolarity_Rising);
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TIM_SetAutoreload(HW_ENC_TIM, enc_counts - 1);
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2016-11-04 07:18:34 -07:00
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// Filter
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HW_ENC_TIM->CCMR1 |= 6 << 12 | 6 << 4;
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HW_ENC_TIM->CCMR2 |= 6 << 4;
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2016-04-27 06:32:32 -07:00
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TIM_Cmd(HW_ENC_TIM, ENABLE);
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// Interrupt on index pulse
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// Connect EXTI Line to pin
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SYSCFG_EXTILineConfig(HW_ENC_EXTI_PORTSRC, HW_ENC_EXTI_PINSRC);
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// Configure EXTI Line
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EXTI_InitStructure.EXTI_Line = HW_ENC_EXTI_LINE;
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EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
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EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
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EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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EXTI_Init(&EXTI_InitStructure);
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// Enable and set EXTI Line Interrupt to the highest priority
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nvicEnableVector(HW_ENC_EXTI_CH, 0);
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mode = ENCODER_MODE_ABI;
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}
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void encoder_init_as5047p_spi(void) {
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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palSetPadMode(SPI_SW_MISO_GPIO, SPI_SW_MISO_PIN, PAL_MODE_INPUT);
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palSetPadMode(SPI_SW_SCK_GPIO, SPI_SW_SCK_PIN, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
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palSetPadMode(SPI_SW_CS_GPIO, SPI_SW_CS_PIN, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
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2016-06-27 08:29:09 -07:00
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// Set MOSI to 1
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#if AS5047_USE_HW_SPI_PINS
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palSetPadMode(SPI_SW_MOSI_GPIO, SPI_SW_MOSI_PIN, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
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palSetPad(SPI_SW_MOSI_GPIO, SPI_SW_MOSI_PIN);
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#endif
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2016-04-27 06:32:32 -07:00
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// Enable timer clock
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HW_ENC_TIM_CLK_EN();
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// Time Base configuration
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TIM_TimeBaseStructure.TIM_Prescaler = 0;
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseStructure.TIM_Period = ((168000000 / 2 / AS5047_SAMPLE_RATE_HZ) - 1);
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TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
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TIM_TimeBaseInit(HW_ENC_TIM, &TIM_TimeBaseStructure);
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// Enable overflow interrupt
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TIM_ITConfig(HW_ENC_TIM, TIM_IT_Update, ENABLE);
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// Enable timer
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TIM_Cmd(HW_ENC_TIM, ENABLE);
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nvicEnableVector(HW_ENC_TIM_ISR_CH, 6);
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mode = ENCODER_MODE_AS5047P_SPI;
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index_found = true;
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2019-02-28 01:00:28 -08:00
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spi_error_rate = 0.0;
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}
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2019-02-18 10:30:19 -08:00
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void encoder_init_ad2s1205_spi(void) {
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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palSetPadMode(SPI_SW_MISO_GPIO, SPI_SW_MISO_PIN, PAL_MODE_INPUT);
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palSetPadMode(SPI_SW_SCK_GPIO, SPI_SW_SCK_PIN, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
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palSetPadMode(SPI_SW_CS_GPIO, SPI_SW_CS_PIN, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
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// Set MOSI to 1
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#if AS5047_USE_HW_SPI_PINS
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palSetPadMode(SPI_SW_MOSI_GPIO, SPI_SW_MOSI_PIN, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
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palSetPad(SPI_SW_MOSI_GPIO, SPI_SW_MOSI_PIN);
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#endif
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// TODO: Choose pins on comm port when these are not defined
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#if defined(AD2S1205_SAMPLE_GPIO) && defined(AD2S1205_RDVEL_GPIO)
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palSetPadMode(AD2S1205_SAMPLE_GPIO, AD2S1205_SAMPLE_PIN, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
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palSetPadMode(AD2S1205_RDVEL_GPIO, AD2S1205_RDVEL_PIN, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
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palSetPad(AD2S1205_SAMPLE_GPIO, AD2S1205_SAMPLE_PIN); // Prepare for a falling edge SAMPLE assertion
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palSetPad(AD2S1205_RDVEL_GPIO, AD2S1205_RDVEL_PIN); // Will always read position
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#endif
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// Enable timer clock
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HW_ENC_TIM_CLK_EN();
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// Time Base configuration
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TIM_TimeBaseStructure.TIM_Prescaler = 0;
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseStructure.TIM_Period = ((168000000 / 2 / AD2S1205_SAMPLE_RATE_HZ) - 1);
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TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
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TIM_TimeBaseInit(HW_ENC_TIM, &TIM_TimeBaseStructure);
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// Enable overflow interrupt
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TIM_ITConfig(HW_ENC_TIM, TIM_IT_Update, ENABLE);
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// Enable timer
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TIM_Cmd(HW_ENC_TIM, ENABLE);
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nvicEnableVector(HW_ENC_TIM_ISR_CH, 6);
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mode = RESOLVER_MODE_AD2S1205;
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index_found = true;
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}
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2019-04-01 04:30:27 -07:00
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void encoder_init_sincos(float s_gain, float s_offset,
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float c_gain, float c_offset, float filter_constant) {
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2019-03-30 14:05:53 -07:00
|
|
|
//ADC inputs are already initialized in hw_init_gpio()
|
|
|
|
sin_gain = s_gain;
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|
|
sin_offset = s_offset;
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|
cos_gain = c_gain;
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|
cos_offset = c_offset;
|
2019-04-01 04:30:27 -07:00
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|
sincos_filter_constant = filter_constant;
|
2019-03-30 14:05:53 -07:00
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|
2019-04-02 06:37:15 -07:00
|
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sincos_signal_below_min_error_cnt = 0;
|
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|
sincos_signal_above_max_error_cnt = 0;
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sincos_signal_low_error_rate = 0.0;
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sincos_signal_above_max_error_rate = 0.0;
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|
2019-03-30 14:05:53 -07:00
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|
|
// ADC measurements needs to be in sync with motor PWM
|
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|
|
#ifdef HW_HAS_SIN_COS_ENCODER
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mode = ENCODER_MODE_SINCOS;
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index_found = true;
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#else
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|
mode = ENCODER_MODE_NONE;
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index_found = false;
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|
#endif
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|
}
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2019-02-18 10:30:19 -08:00
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|
2016-04-27 06:32:32 -07:00
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bool encoder_is_configured(void) {
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|
return mode != ENCODER_MODE_NONE;
|
2015-04-11 01:07:36 -07:00
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}
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|
2019-02-18 10:30:19 -08:00
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|
|
/**
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|
* Read angle from configured encoder.
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*
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|
* @return
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* The current encoder angle in degrees.
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*/
|
2015-04-11 01:07:36 -07:00
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|
float encoder_read_deg(void) {
|
2016-04-27 06:32:32 -07:00
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static float angle = 0.0;
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|
switch (mode) {
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|
case ENCODER_MODE_ABI:
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angle = ((float)HW_ENC_TIM->CNT * 360.0) / (float)enc_counts;
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|
break;
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|
case ENCODER_MODE_AS5047P_SPI:
|
2019-02-18 10:30:19 -08:00
|
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|
case RESOLVER_MODE_AD2S1205:
|
2016-04-27 06:32:32 -07:00
|
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angle = last_enc_angle;
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|
|
break;
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|
|
|
|
2019-03-30 14:05:53 -07:00
|
|
|
#ifdef HW_HAS_SIN_COS_ENCODER
|
2019-04-01 04:30:27 -07:00
|
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|
case ENCODER_MODE_SINCOS: {
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|
float sin = ENCODER_SIN_VOLTS * sin_gain - sin_offset;
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float cos = ENCODER_COS_VOLTS * cos_gain - cos_offset;
|
2019-03-30 14:05:53 -07:00
|
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|
2019-04-02 06:37:15 -07:00
|
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|
float module = SQ(sin) + SQ(cos);
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|
if (module > SQ(SINCOS_MAX_AMPLITUDE) ) {
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|
|
// signals vector outside of the valid area. Increase error count and discard measurement
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|
|
|
++sincos_signal_above_max_error_cnt;
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|
|
|
UTILS_LP_FAST(sincos_signal_above_max_error_rate, 1.0, 1./SINCOS_SAMPLE_RATE_HZ);
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|
|
|
angle = last_enc_angle;
|
2019-04-01 04:30:27 -07:00
|
|
|
}
|
2019-04-02 06:37:15 -07:00
|
|
|
else {
|
|
|
|
if (module < SQ(SINCOS_MIN_AMPLITUDE)) {
|
|
|
|
++sincos_signal_below_min_error_cnt;
|
|
|
|
UTILS_LP_FAST(sincos_signal_low_error_rate, 1.0, 1./SINCOS_SAMPLE_RATE_HZ);
|
|
|
|
angle = last_enc_angle;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
UTILS_LP_FAST(sincos_signal_above_max_error_rate, 0.0, 1./SINCOS_SAMPLE_RATE_HZ);
|
|
|
|
UTILS_LP_FAST(sincos_signal_low_error_rate, 0.0, 1./SINCOS_SAMPLE_RATE_HZ);
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|
|
|
|
|
|
|
float angle_tmp = utils_fast_atan2(sin, cos) * 180.0 / M_PI;
|
|
|
|
UTILS_LP_FAST(angle, angle_tmp, sincos_filter_constant);
|
|
|
|
last_enc_angle = angle;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
2019-03-30 14:05:53 -07:00
|
|
|
#endif
|
|
|
|
|
2016-04-27 06:32:32 -07:00
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return angle;
|
2015-12-08 12:01:23 -08:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Reset the encoder counter. Should be called from the index interrupt.
|
|
|
|
*/
|
|
|
|
void encoder_reset(void) {
|
2016-11-04 07:18:34 -07:00
|
|
|
// Only reset if the pin is still high to avoid too short pulses, which
|
|
|
|
// most likely are noise.
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
if (palReadPad(HW_HALL_ENC_GPIO3, HW_HALL_ENC_PIN3)) {
|
2017-09-04 12:12:43 -07:00
|
|
|
const unsigned int cnt = HW_ENC_TIM->CNT;
|
2016-11-04 07:18:34 -07:00
|
|
|
static int bad_pulses = 0;
|
|
|
|
const unsigned int lim = enc_counts / 20;
|
|
|
|
|
|
|
|
if (index_found) {
|
|
|
|
// Some plausibility filtering.
|
|
|
|
if (cnt > (enc_counts - lim) || cnt < lim) {
|
|
|
|
HW_ENC_TIM->CNT = 0;
|
|
|
|
bad_pulses = 0;
|
|
|
|
} else {
|
|
|
|
bad_pulses++;
|
|
|
|
|
|
|
|
if (bad_pulses > 5) {
|
|
|
|
index_found = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
HW_ENC_TIM->CNT = 0;
|
|
|
|
index_found = true;
|
|
|
|
bad_pulses = 0;
|
|
|
|
}
|
|
|
|
}
|
2015-12-08 12:01:23 -08:00
|
|
|
}
|
|
|
|
|
2018-11-04 05:06:02 -08:00
|
|
|
// returns true for even number of ones (no parity error according to AS5047 datasheet
|
2019-03-01 12:36:58 -08:00
|
|
|
bool spi_check_parity(uint16_t x) {
|
|
|
|
x ^= x >> 8;
|
|
|
|
x ^= x >> 4;
|
|
|
|
x ^= x >> 2;
|
|
|
|
x ^= x >> 1;
|
|
|
|
return (~x) & 1;
|
2018-11-04 05:06:02 -08:00
|
|
|
}
|
|
|
|
|
2016-04-27 06:32:32 -07:00
|
|
|
/**
|
|
|
|
* Timer interrupt
|
|
|
|
*/
|
|
|
|
void encoder_tim_isr(void) {
|
|
|
|
uint16_t pos;
|
|
|
|
|
2019-02-18 10:30:19 -08:00
|
|
|
if(mode == ENCODER_MODE_AS5047P_SPI) {
|
|
|
|
spi_begin();
|
|
|
|
spi_transfer(&pos, 0, 1);
|
|
|
|
spi_end();
|
|
|
|
|
2018-11-04 05:06:02 -08:00
|
|
|
spi_val = pos;
|
2019-03-04 10:23:38 -08:00
|
|
|
if(spi_check_parity(pos) && pos != 0xffff) { // all ones = disconnect
|
2018-11-04 05:06:02 -08:00
|
|
|
pos &= 0x3FFF;
|
|
|
|
last_enc_angle = ((float)pos * 360.0) / 16384.0;
|
2019-01-29 10:16:15 -08:00
|
|
|
UTILS_LP_FAST(spi_error_rate, 0.0, 1./AS5047_SAMPLE_RATE_HZ);
|
2018-11-04 05:06:02 -08:00
|
|
|
} else {
|
|
|
|
++spi_error_cnt;
|
2019-01-29 10:16:15 -08:00
|
|
|
UTILS_LP_FAST(spi_error_rate, 1.0, 1./AS5047_SAMPLE_RATE_HZ);
|
2018-11-04 05:06:02 -08:00
|
|
|
}
|
2019-02-18 10:30:19 -08:00
|
|
|
}
|
|
|
|
|
|
|
|
if(mode == RESOLVER_MODE_AD2S1205) {
|
|
|
|
// SAMPLE signal should have been be asserted in sync with ADC sampling
|
|
|
|
#ifdef AD2S1205_RDVEL_GPIO
|
|
|
|
palSetPad(AD2S1205_RDVEL_GPIO, AD2S1205_RDVEL_PIN); // Always read position
|
|
|
|
#endif
|
2016-04-27 06:32:32 -07:00
|
|
|
|
2019-02-18 10:30:19 -08:00
|
|
|
spi_begin(); // CS uses the same mcu pin as AS5047
|
|
|
|
|
|
|
|
spi_transfer(&pos, 0, 1);
|
|
|
|
spi_end();
|
|
|
|
|
|
|
|
uint16_t RDVEL = pos & 0x08; // 1 means a position read
|
|
|
|
uint16_t DOS = pos & 0x04;
|
|
|
|
uint16_t LOT = pos & 0x02;
|
|
|
|
// uint16_t parity = pos & 0x01; // 16 bit frame should have odd parity
|
|
|
|
|
|
|
|
pos &= 0xFFF0;
|
|
|
|
pos = pos >> 4;
|
|
|
|
pos &= 0x0FFF; // check if needed
|
|
|
|
|
|
|
|
if((RDVEL != 0) && (DOS != 0) && (LOT != 0)) {
|
|
|
|
last_enc_angle = ((float)pos * 360.0) / 4096.0;
|
|
|
|
}
|
|
|
|
}
|
2016-04-27 06:32:32 -07:00
|
|
|
}
|
|
|
|
|
2015-12-08 12:01:23 -08:00
|
|
|
/**
|
|
|
|
* Set the number of encoder counts.
|
|
|
|
*
|
|
|
|
* @param counts
|
|
|
|
* The number of encoder counts
|
|
|
|
*/
|
|
|
|
void encoder_set_counts(uint32_t counts) {
|
|
|
|
if (counts != enc_counts) {
|
|
|
|
enc_counts = counts;
|
|
|
|
TIM_SetAutoreload(HW_ENC_TIM, enc_counts - 1);
|
|
|
|
index_found = false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Check if the index pulse is found.
|
|
|
|
*
|
|
|
|
* @return
|
|
|
|
* True if the index is found, false otherwise.
|
|
|
|
*/
|
|
|
|
bool encoder_index_found(void) {
|
|
|
|
return index_found;
|
2015-04-11 01:07:36 -07:00
|
|
|
}
|
2016-04-27 06:32:32 -07:00
|
|
|
|
|
|
|
// Software SPI
|
|
|
|
static void spi_transfer(uint16_t *in_buf, const uint16_t *out_buf, int length) {
|
|
|
|
for (int i = 0;i < length;i++) {
|
|
|
|
uint16_t send = out_buf ? out_buf[i] : 0xFFFF;
|
|
|
|
uint16_t recieve = 0;
|
|
|
|
|
|
|
|
for (int bit = 0;bit < 16;bit++) {
|
|
|
|
//palWritePad(HW_SPI_PORT_MOSI, HW_SPI_PIN_MOSI, send >> 15);
|
|
|
|
send <<= 1;
|
|
|
|
|
|
|
|
spi_delay();
|
|
|
|
palSetPad(SPI_SW_SCK_GPIO, SPI_SW_SCK_PIN);
|
|
|
|
spi_delay();
|
|
|
|
|
2016-11-04 07:18:34 -07:00
|
|
|
int r1, r2, r3;
|
|
|
|
r1 = palReadPad(SPI_SW_MISO_GPIO, SPI_SW_MISO_PIN);
|
|
|
|
__NOP();
|
|
|
|
r2 = palReadPad(SPI_SW_MISO_GPIO, SPI_SW_MISO_PIN);
|
|
|
|
__NOP();
|
|
|
|
r3 = palReadPad(SPI_SW_MISO_GPIO, SPI_SW_MISO_PIN);
|
|
|
|
|
2016-04-27 06:32:32 -07:00
|
|
|
recieve <<= 1;
|
2016-11-04 07:18:34 -07:00
|
|
|
if (utils_middle_of_3_int(r1, r2, r3)) {
|
2016-04-27 06:32:32 -07:00
|
|
|
recieve |= 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
palClearPad(SPI_SW_SCK_GPIO, SPI_SW_SCK_PIN);
|
|
|
|
spi_delay();
|
|
|
|
}
|
|
|
|
|
|
|
|
if (in_buf) {
|
|
|
|
in_buf[i] = recieve;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void spi_begin(void) {
|
|
|
|
palClearPad(SPI_SW_CS_GPIO, SPI_SW_CS_PIN);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void spi_end(void) {
|
|
|
|
palSetPad(SPI_SW_CS_GPIO, SPI_SW_CS_PIN);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void spi_delay(void) {
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
__NOP();
|
|
|
|
}
|