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RIOT/drivers/mpu9150/mpu9150.c
Kees Bakker bac5cda1e3 periph/i2c: convert char to uint8_t where applicapable 
In general, data transferred through I2C are bytes and thus should have
type uint8_t, not char.

Also convert uint8_t ptrs to void ptrs
2016-10-04 20:26:39 +02:00

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/*
* Copyright (C) 2015 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup drivers_mpu9150
* @{
*
* @file
* @brief Device driver implementation for the MPU-9150 9-Axis Motion Sensor
*
* @author Fabian Nack <nack@inf.fu-berlin.de>
*
* @}
*/
#include "mpu9150.h"
#include "mpu9150-regs.h"
#include "periph/i2c.h"
#include "xtimer.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#define REG_RESET (0x00)
#define MAX_VALUE (0x7FFF)
/* Default config settings */
static const mpu9150_status_t DEFAULT_STATUS = {
.accel_pwr = MPU9150_SENSOR_PWR_ON,
.gyro_pwr = MPU9150_SENSOR_PWR_ON,
.compass_pwr = MPU9150_SENSOR_PWR_ON,
.gyro_fsr = MPU9150_GYRO_FSR_250DPS,
.accel_fsr = MPU9150_ACCEL_FSR_16G,
.sample_rate = 0,
.compass_sample_rate = 0,
.compass_x_adj = 0,
.compass_y_adj = 0,
.compass_z_adj = 0,
};
/* Internal function prototypes */
static int compass_init(mpu9150_t *dev);
static void conf_bypass(mpu9150_t *dev, uint8_t bypass_enable);
static void conf_lpf(mpu9150_t *dev, uint16_t rate);
/*---------------------------------------------------------------------------*
* MPU9150 Core API *
*---------------------------------------------------------------------------*/
int mpu9150_init(mpu9150_t *dev, i2c_t i2c, mpu9150_hw_addr_t hw_addr,
mpu9150_comp_addr_t comp_addr)
{
uint8_t temp;
dev->i2c_dev = i2c;
dev->hw_addr = hw_addr;
dev->comp_addr = comp_addr;
dev->conf = DEFAULT_STATUS;
/* Initialize I2C interface */
if (i2c_init_master(dev->i2c_dev, I2C_SPEED_FAST)) {
DEBUG("[Error] I2C device not enabled\n");
return -1;
}
/* Acquire exclusive access */
i2c_acquire(dev->i2c_dev);
/* Reset MPU9150 registers and afterwards wake up the chip */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_1_REG, MPU9150_PWR_RESET);
xtimer_usleep(MPU9150_RESET_SLEEP_US);
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_1_REG, MPU9150_PWR_WAKEUP);
/* Release the bus, it is acquired again inside each function */
i2c_release(dev->i2c_dev);
/* Set default full scale ranges and sample rate */
mpu9150_set_gyro_fsr(dev, MPU9150_GYRO_FSR_2000DPS);
mpu9150_set_accel_fsr(dev, MPU9150_ACCEL_FSR_2G);
mpu9150_set_sample_rate(dev, MPU9150_DEFAULT_SAMPLE_RATE);
/* Disable interrupt generation */
i2c_acquire(dev->i2c_dev);
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_INT_ENABLE_REG, REG_RESET);
/* Initialize magnetometer */
if (compass_init(dev)) {
i2c_release(dev->i2c_dev);
return -2;
}
/* Release the bus, it is acquired again inside each function */
i2c_release(dev->i2c_dev);
mpu9150_set_compass_sample_rate(dev, 10);
/* Enable all sensors */
i2c_acquire(dev->i2c_dev);
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_1_REG, MPU9150_PWR_PLL);
i2c_read_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_2_REG, &temp);
temp &= ~(MPU9150_PWR_ACCEL | MPU9150_PWR_GYRO);
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_2_REG, temp);
i2c_release(dev->i2c_dev);
xtimer_usleep(MPU9150_PWR_CHANGE_SLEEP_US);
return 0;
}
int mpu9150_set_accel_power(mpu9150_t *dev, mpu9150_pwr_t pwr_conf)
{
uint8_t pwr_1_setting, pwr_2_setting;
if (dev->conf.accel_pwr == pwr_conf) {
return 0;
}
/* Acquire exclusive access */
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
/* Read current power management 2 configuration */
i2c_read_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_2_REG, &pwr_2_setting);
/* Prepare power register settings */
if (pwr_conf == MPU9150_SENSOR_PWR_ON) {
pwr_1_setting = MPU9150_PWR_WAKEUP;
pwr_2_setting &= ~(MPU9150_PWR_ACCEL);
}
else {
pwr_1_setting = BIT_PWR_MGMT1_SLEEP;
pwr_2_setting |= MPU9150_PWR_ACCEL;
}
/* Configure power management 1 register if needed */
if ((dev->conf.gyro_pwr == MPU9150_SENSOR_PWR_OFF)
&& (dev->conf.compass_pwr == MPU9150_SENSOR_PWR_OFF)) {
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_1_REG, pwr_1_setting);
}
/* Enable/disable accelerometer standby in power management 2 register */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_2_REG, pwr_2_setting);
/* Release the bus */
i2c_release(dev->i2c_dev);
dev->conf.accel_pwr = pwr_conf;
xtimer_usleep(MPU9150_PWR_CHANGE_SLEEP_US);
return 0;
}
int mpu9150_set_gyro_power(mpu9150_t *dev, mpu9150_pwr_t pwr_conf)
{
uint8_t pwr_2_setting;
if (dev->conf.gyro_pwr == pwr_conf) {
return 0;
}
/* Acquire exclusive access */
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
/* Read current power management 2 configuration */
i2c_read_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_2_REG, &pwr_2_setting);
/* Prepare power register settings */
if (pwr_conf == MPU9150_SENSOR_PWR_ON) {
/* Set clock to pll */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_1_REG, MPU9150_PWR_PLL);
pwr_2_setting &= ~(MPU9150_PWR_GYRO);
}
else {
/* Configure power management 1 register */
if ((dev->conf.accel_pwr == MPU9150_SENSOR_PWR_OFF)
&& (dev->conf.compass_pwr == MPU9150_SENSOR_PWR_OFF)) {
/* All sensors turned off, put the MPU-9150 to sleep */
i2c_write_reg(dev->i2c_dev, dev->hw_addr,
MPU9150_PWR_MGMT_1_REG, BIT_PWR_MGMT1_SLEEP);
}
else {
/* Reset clock to internal oscillator */
i2c_write_reg(dev->i2c_dev, dev->hw_addr,
MPU9150_PWR_MGMT_1_REG, MPU9150_PWR_WAKEUP);
}
pwr_2_setting |= MPU9150_PWR_GYRO;
}
/* Enable/disable gyroscope standby in power management 2 register */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_2_REG, pwr_2_setting);
/* Release the bus */
i2c_release(dev->i2c_dev);
dev->conf.gyro_pwr = pwr_conf;
xtimer_usleep(MPU9150_PWR_CHANGE_SLEEP_US);
return 0;
}
int mpu9150_set_compass_power(mpu9150_t *dev, mpu9150_pwr_t pwr_conf)
{
uint8_t pwr_1_setting, usr_ctrl_setting, s1_do_setting;
if (dev->conf.compass_pwr == pwr_conf) {
return 0;
}
/* Acquire exclusive access */
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
/* Read current user control configuration */
i2c_read_reg(dev->i2c_dev, dev->hw_addr, MPU9150_USER_CTRL_REG, &usr_ctrl_setting);
/* Prepare power register settings */
if (pwr_conf == MPU9150_SENSOR_PWR_ON) {
pwr_1_setting = MPU9150_PWR_WAKEUP;
s1_do_setting = MPU9150_COMP_SINGLE_MEASURE;
usr_ctrl_setting |= BIT_I2C_MST_EN;
}
else {
pwr_1_setting = BIT_PWR_MGMT1_SLEEP;
s1_do_setting = MPU9150_COMP_POWER_DOWN;
usr_ctrl_setting &= ~(BIT_I2C_MST_EN);
}
/* Configure power management 1 register if needed */
if ((dev->conf.gyro_pwr == MPU9150_SENSOR_PWR_OFF)
&& (dev->conf.accel_pwr == MPU9150_SENSOR_PWR_OFF)) {
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_PWR_MGMT_1_REG, pwr_1_setting);
}
/* Configure mode writing by slave line 1 */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_SLAVE1_DATA_OUT_REG, s1_do_setting);
/* Enable/disable I2C master mode */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_USER_CTRL_REG, usr_ctrl_setting);
/* Release the bus */
i2c_release(dev->i2c_dev);
dev->conf.compass_pwr = pwr_conf;
xtimer_usleep(MPU9150_PWR_CHANGE_SLEEP_US);
return 0;
}
int mpu9150_read_gyro(mpu9150_t *dev, mpu9150_results_t *output)
{
uint8_t data[6];
int16_t temp;
float fsr;
switch (dev->conf.gyro_fsr) {
case MPU9150_GYRO_FSR_250DPS:
fsr = 250.0;
break;
case MPU9150_GYRO_FSR_500DPS:
fsr = 500.0;
break;
case MPU9150_GYRO_FSR_1000DPS:
fsr = 1000.0;
break;
case MPU9150_GYRO_FSR_2000DPS:
fsr = 2000.0;
break;
default:
return -2;
}
/* Acquire exclusive access */
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
/* Read raw data */
i2c_read_regs(dev->i2c_dev, dev->hw_addr, MPU9150_GYRO_START_REG, data, 6);
/* Release the bus */
i2c_release(dev->i2c_dev);
/* Normalize data according to configured full scale range */
temp = (data[0] << 8) | data[1];
output->x_axis = (temp * fsr) / MAX_VALUE;
temp = (data[2] << 8) | data[3];
output->y_axis = (temp * fsr) / MAX_VALUE;
temp = (data[4] << 8) | data[5];
output->z_axis = (temp * fsr) / MAX_VALUE;
return 0;
}
int mpu9150_read_accel(mpu9150_t *dev, mpu9150_results_t *output)
{
uint8_t data[6];
int16_t temp;
float fsr;
switch (dev->conf.accel_fsr) {
case MPU9150_ACCEL_FSR_2G:
fsr = 2000.0;
break;
case MPU9150_ACCEL_FSR_4G:
fsr = 4000.0;
break;
case MPU9150_ACCEL_FSR_8G:
fsr = 8000.0;
break;
case MPU9150_ACCEL_FSR_16G:
fsr = 16000.0;
break;
default:
return -2;
}
/* Acquire exclusive access */
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
/* Read raw data */
i2c_read_regs(dev->i2c_dev, dev->hw_addr, MPU9150_ACCEL_START_REG, data, 6);
/* Release the bus */
i2c_release(dev->i2c_dev);
/* Normalize data according to configured full scale range */
temp = (data[0] << 8) | data[1];
output->x_axis = (temp * fsr) / MAX_VALUE;
temp = (data[2] << 8) | data[3];
output->y_axis = (temp * fsr) / MAX_VALUE;
temp = (data[4] << 8) | data[5];
output->z_axis = (temp * fsr) / MAX_VALUE;
return 0;
}
int mpu9150_read_compass(mpu9150_t *dev, mpu9150_results_t *output)
{
uint8_t data[6];
/* Acquire exclusive access */
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
/* Read raw data */
i2c_read_regs(dev->i2c_dev, dev->hw_addr, MPU9150_EXT_SENS_DATA_START_REG, data, 6);
/* Release the bus */
i2c_release(dev->i2c_dev);
output->x_axis = (data[1] << 8) | data[0];
output->y_axis = (data[3] << 8) | data[2];
output->z_axis = (data[5] << 8) | data[4];
/* Compute sensitivity adjustment */
output->x_axis = (int16_t) (((float)output->x_axis) *
((((dev->conf.compass_x_adj - 128) * 0.5) / 128.0) + 1));
output->y_axis = (int16_t) (((float)output->y_axis) *
((((dev->conf.compass_y_adj - 128) * 0.5) / 128.0) + 1));
output->z_axis = (int16_t) (((float)output->z_axis) *
((((dev->conf.compass_z_adj - 128) * 0.5) / 128.0) + 1));
/* Normalize data according to full-scale range */
output->x_axis = output->x_axis * 0.3;
output->y_axis = output->y_axis * 0.3;
output->z_axis = output->z_axis * 0.3;
return 0;
}
int mpu9150_read_temperature(mpu9150_t *dev, int32_t *output)
{
uint8_t data[2];
int16_t temp;
/* Acquire exclusive access */
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
/* Read raw temperature value */
i2c_read_regs(dev->i2c_dev, dev->hw_addr, MPU9150_TEMP_START_REG, data, 2);
/* Release the bus */
i2c_release(dev->i2c_dev);
temp = (data[0] << 8) | data[1];
*output = ((((int32_t)temp) * 1000) / 340) + (35*1000);
return 0;
}
int mpu9150_set_gyro_fsr(mpu9150_t *dev, mpu9150_gyro_ranges_t fsr)
{
if (dev->conf.gyro_fsr == fsr) {
return 0;
}
switch (fsr) {
case MPU9150_GYRO_FSR_250DPS:
case MPU9150_GYRO_FSR_500DPS:
case MPU9150_GYRO_FSR_1000DPS:
case MPU9150_GYRO_FSR_2000DPS:
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
i2c_write_reg(dev->i2c_dev, dev->hw_addr,
MPU9150_GYRO_CFG_REG, (fsr << 3));
i2c_release(dev->i2c_dev);
dev->conf.gyro_fsr = fsr;
break;
default:
return -2;
}
return 0;
}
int mpu9150_set_accel_fsr(mpu9150_t *dev, mpu9150_accel_ranges_t fsr)
{
if (dev->conf.accel_fsr == fsr) {
return 0;
}
switch (fsr) {
case MPU9150_ACCEL_FSR_2G:
case MPU9150_ACCEL_FSR_4G:
case MPU9150_ACCEL_FSR_8G:
case MPU9150_ACCEL_FSR_16G:
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
i2c_write_reg(dev->i2c_dev, dev->hw_addr,
MPU9150_ACCEL_CFG_REG, (fsr << 3));
i2c_release(dev->i2c_dev);
dev->conf.accel_fsr = fsr;
break;
default:
return -2;
}
return 0;
}
int mpu9150_set_sample_rate(mpu9150_t *dev, uint16_t rate)
{
uint8_t divider;
if ((rate < MPU9150_MIN_SAMPLE_RATE) || (rate > MPU9150_MAX_SAMPLE_RATE)) {
return -2;
}
else if (dev->conf.sample_rate == rate) {
return 0;
}
/* Compute divider to achieve desired sample rate and write to rate div register */
divider = (1000 / rate - 1);
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_RATE_DIV_REG, divider);
/* Store configured sample rate */
dev->conf.sample_rate = 1000 / (((uint16_t) divider) + 1);
/* Always set LPF to a maximum of half the configured sampling rate */
conf_lpf(dev, (dev->conf.sample_rate >> 1));
i2c_release(dev->i2c_dev);
return 0;
}
int mpu9150_set_compass_sample_rate(mpu9150_t *dev, uint8_t rate)
{
uint8_t divider;
if ((rate < MPU9150_MIN_COMP_SMPL_RATE) || (rate > MPU9150_MAX_COMP_SMPL_RATE)
|| (rate > dev->conf.sample_rate)) {
return -2;
}
else if (dev->conf.compass_sample_rate == rate) {
return 0;
}
/* Compute divider to achieve desired sample rate and write to slave ctrl register */
divider = (dev->conf.sample_rate / rate - 1);
if (i2c_acquire(dev->i2c_dev)) {
return -1;
}
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_SLAVE4_CTRL_REG, divider);
i2c_release(dev->i2c_dev);
/* Store configured sample rate */
dev->conf.compass_sample_rate = dev->conf.sample_rate / (((uint16_t) divider) + 1);
return 0;
}
/*------------------------------------------------------------------------------------*/
/* Internal functions */
/*------------------------------------------------------------------------------------*/
/**
* Initialize compass
* Caution: This internal function does not acquire exclusive access to the I2C bus.
* Acquisation and release is supposed to be handled by the calling function.
*/
static int compass_init(mpu9150_t *dev)
{
uint8_t data[3];
/* Enable Bypass Mode to speak to compass directly */
conf_bypass(dev, 1);
/* Check whether compass answers correctly */
i2c_read_reg(dev->i2c_dev, dev->comp_addr, COMPASS_WHOAMI_REG, data);
if (data[0] != MPU9150_COMP_WHOAMI_ANSWER) {
DEBUG("[Error] Wrong answer from compass\n");
return -1;
}
/* Configure Power Down mode */
i2c_write_reg(dev->i2c_dev, dev->comp_addr, COMPASS_CNTL_REG, MPU9150_COMP_POWER_DOWN);
xtimer_usleep(MPU9150_COMP_MODE_SLEEP_US);
/* Configure Fuse ROM access */
i2c_write_reg(dev->i2c_dev, dev->comp_addr, COMPASS_CNTL_REG, MPU9150_COMP_FUSE_ROM);
xtimer_usleep(MPU9150_COMP_MODE_SLEEP_US);
/* Read sensitivity adjustment values from Fuse ROM */
i2c_read_regs(dev->i2c_dev, dev->comp_addr, COMPASS_ASAX_REG, data, 3);
dev->conf.compass_x_adj = data[0];
dev->conf.compass_y_adj = data[1];
dev->conf.compass_z_adj = data[2];
/* Configure Power Down mode again */
i2c_write_reg(dev->i2c_dev, dev->comp_addr, COMPASS_CNTL_REG, MPU9150_COMP_POWER_DOWN);
xtimer_usleep(MPU9150_COMP_MODE_SLEEP_US);
/* Disable Bypass Mode to configure MPU as master to the compass */
conf_bypass(dev, 0);
/* Configure MPU9150 for single master mode */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_I2C_MST_REG, BIT_WAIT_FOR_ES);
/* Set up slave line 0 */
/* Slave line 0 reads the compass data */
i2c_write_reg(dev->i2c_dev, dev->hw_addr,
MPU9150_SLAVE0_ADDR_REG, (BIT_SLAVE_RW | dev->comp_addr));
/* Slave line 0 read starts at compass data register */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_SLAVE0_REG_REG, COMPASS_DATA_START_REG);
/* Enable slave line 0 and configure read length to 6 consecutive registers */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_SLAVE0_CTRL_REG, (BIT_SLAVE_EN | 0x06));
/* Set up slave line 1 */
/* Slave line 1 writes to the compass */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_SLAVE1_ADDR_REG, dev->comp_addr);
/* Slave line 1 write starts at compass control register */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_SLAVE1_REG_REG, COMPASS_CNTL_REG);
/* Enable slave line 1 and configure write length to 1 register */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_SLAVE1_CTRL_REG, (BIT_SLAVE_EN | 0x01));
/* Configure data which is written by slave line 1 to compass control */
i2c_write_reg(dev->i2c_dev, dev->hw_addr,
MPU9150_SLAVE1_DATA_OUT_REG, MPU9150_COMP_SINGLE_MEASURE);
/* Slave line 0 and 1 operate at each sample */
i2c_write_reg(dev->i2c_dev, dev->hw_addr,
MPU9150_I2C_DELAY_CTRL_REG, (BIT_SLV0_DELAY_EN | BIT_SLV1_DELAY_EN));
/* Set I2C bus to VDD */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_YG_OFFS_TC_REG, BIT_I2C_MST_VDDIO);
return 0;
}
/**
* Configure bypass mode
* Caution: This internal function does not acquire exclusive access to the I2C bus.
* Acquisation and release is supposed to be handled by the calling function.
*/
static void conf_bypass(mpu9150_t *dev, uint8_t bypass_enable)
{
uint8_t data;
i2c_read_reg(dev->i2c_dev, dev->hw_addr, MPU9150_USER_CTRL_REG, &data);
if (bypass_enable) {
data &= ~(BIT_I2C_MST_EN);
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_USER_CTRL_REG, data);
xtimer_usleep(MPU9150_BYPASS_SLEEP_US);
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_INT_PIN_CFG_REG, BIT_I2C_BYPASS_EN);
}
else {
data |= BIT_I2C_MST_EN;
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_USER_CTRL_REG, data);
xtimer_usleep(MPU9150_BYPASS_SLEEP_US);
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_INT_PIN_CFG_REG, REG_RESET);
}
}
/**
* Configure low pass filter
* Caution: This internal function does not acquire exclusive access to the I2C bus.
* Acquisation and release is supposed to be handled by the calling function.
*/
static void conf_lpf(mpu9150_t *dev, uint16_t half_rate)
{
mpu9150_lpf_t lpf_setting;
/* Get target LPF configuration setting */
if (half_rate >= 188) {
lpf_setting = MPU9150_FILTER_188HZ;
}
else if (half_rate >= 98) {
lpf_setting = MPU9150_FILTER_98HZ;
}
else if (half_rate >= 42) {
lpf_setting = MPU9150_FILTER_42HZ;
}
else if (half_rate >= 20) {
lpf_setting = MPU9150_FILTER_20HZ;
}
else if (half_rate >= 10) {
lpf_setting = MPU9150_FILTER_10HZ;
}
else {
lpf_setting = MPU9150_FILTER_5HZ;
}
/* Write LPF setting to configuration register */
i2c_write_reg(dev->i2c_dev, dev->hw_addr, MPU9150_LPF_REG, lpf_setting);
}
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