JP2007232415A - Portable electronic equipment and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent wrong azimuth detection even when external equipment generating a magnetic field such as a speaker is mounted on/dismounted from portable electronic equipment which displays an azimuth and its control method. <P>SOLUTION: This portable electronic equipment 100 is equipped with: a display part 107 for displaying information, a geomagnetic sensor 108 for detecting geomagnetism; and a control part 150 for calculating an azimuth, based on the geomagnetism detected by the geomagnetic sensor 108 and displaying the calculated azimuth information on a display part. The equipment 100 also has characteristics wherein, when the external equipment generating a magnetic field connected to the portable electronic equipment 100 is separated from the portable electronic equipment 100, the control part 150 informs a user of an effect that calibration of offset to azimuth calculation by the geomagnetic sensor 108 is to be performed, or performs calibration control for performing the calibration by itself. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portable electronic device equipped with a geomagnetic sensor and capable of displaying a direction calculated based on a detection result thereof, and a control method thereof.

In recent years, mobile electronic devices typified by mobile phones have become increasingly sophisticated. For example, as shown in the following patent document, a portable electronic device capable of calculating an azimuth based on geomagnetism detected by a geomagnetic sensor is known.
JP 2003-289366 A JP 2005-110031 A JP-A-2005-107324 JP 2005-107323 A JP 2005-3000896 A JP 2005-291936 A JP 2005-291935 A JP 2005-291934 A JP 2005-291933 A JP 2005-291932 A JP 2005-291931 A

  On the other hand, the functions of music players installed in mobile phones have been enhanced year by year, and higher-quality audio playback has been demanded. However, mobile phones are limited in housing size and large in size. There is a problem that the low frequency range cannot be reproduced satisfactorily because a speaker having a diameter cannot be mounted. Therefore, recently, an external device connected to a mobile phone has been developed in which a speaker is mounted on a charger. Thus, high-quality audio reproduction can be performed by a large-diameter speaker attached to the charger while charging the battery of the mobile phone with the charger. However, when such a new configuration is added to an external device, there is a conflict with the direction calculation function provided in the conventional mobile phone.

  The problem to be solved by the present invention is that a portable electronic device capable of displaying an azimuth and a method for controlling the portable electronic device and a method for controlling the portable electronic device that has a wrong orientation even when an external device that generates a magnetic field such as a speaker is attached to or detached from the portable electronic device It is to provide something that can prevent detection.

  The present invention provides a display unit that displays information, a geomagnetic sensor that detects geomagnetism, and a control unit that calculates an azimuth based on the geomagnetism detected by the geomagnetic sensor and displays information on the calculated azimuth on the display unit When the external device that generates the magnetic field connected to the portable electronic device is separated from the portable electronic device, the control unit is configured to calculate the azimuth by the geomagnetic sensor. It is characterized in that calibration control for notifying the user that offset calibration should be performed or performing the calibration itself is performed.

  Preferably, the portable electronic device according to the present invention is characterized in that the control unit performs control to display information indicating that calibration should be performed on the display unit.

  More preferably, the portable electronic device of the present invention further includes a detection unit that detects a connection with the external device, and the control unit determines whether the external device is connected based on a detection result of the detection unit. It is characterized by doing.

  The external device includes a terminal, and the detection unit detects a connection with the external device by monitoring a voltage applied between the terminals.

  The portable electronic device according to the present invention is characterized in that the control unit executes the calibration control when the connected external device is removed while the direction information is displayed on the display unit. And

  In the portable electronic device according to the present invention, when the connected external device is removed while the orientation information is not displayed on the display unit, the control unit displays the orientation information on the display unit. In this case, the calibration control is performed.

  An external device connected to the portable electronic device according to the present invention includes a magnet.

  Preferably, the external device connected to the portable electronic device of the present invention is a charger with a coil speaker, and the magnet provided in the external device is a magnet of the coil speaker.

  Preferably, the external device connected to the portable electronic device of the present invention is a USB device, an earphone, or a connector for a charging cable.

  The present invention is also a method for controlling a portable electronic device including a display unit that displays information including an orientation based on geomagnetism detected by a geomagnetic sensor, and the external device generates a magnetic field connectable to the portable electronic device. The step of determining the connection state, and when the connection state changes from the connected state to the released state, the display unit should be offset-calibrated with respect to the display of the orientation by the geomagnetic sensor by magnetization. And displaying the information on the display unit.

  According to the portable electronic device and the control method thereof of the present invention, even when an external device that generates a magnetic field is connected to the portable electronic device, it is possible to prevent detection of an erroneous orientation due to magnetization.

FIG. 1 is a diagram illustrating an appearance of a mobile phone as the mobile electronic device 100.
On the outer surface of the portable electronic device 100 shown in FIG. 1 are a key input unit 103 such as numeric keys and a display unit 107 for displaying information. Inside the portable electronic device 100, there are a geomagnetic sensor 108 for detecting geomagnetism and a control unit 150 whose main component is a central processing unit. Further, a pair of charging terminals Tc for charging the battery of the portable electronic device 100 is provided on the bottom surface of the portable electronic device 100. The side surface of the portable electronic device 100 has an external connector Tio, and the portable electronic device 100 is connected to a personal computer to input / output data. The external connector Tio has a second charging terminal Td for charging the battery.

FIG. 2 is a diagram illustrating a configuration example of the portable electronic device 100 having an appearance as illustrated in FIG.
2 includes a wireless communication unit 101, a GPS signal receiving unit 102, a key input unit 103, an audio processing unit 104, a speaker 105, a microphone 106, a display unit 107, and a geomagnetic sensor. 108, a storage unit 109, a charger detection unit 110, a battery unit 111, and a control unit 150.

  The wireless communication unit 101 performs wireless communication with a base station (not shown) connected to the communication network. For example, the communication unit 101 performs predetermined modulation processing on the transmission data supplied from the control unit 150, converts the transmission data into a radio signal, and transmits the radio signal from the antenna. In addition, a predetermined demodulation process is performed on the radio signal from the base station received by the antenna to convert the radio signal to reception data, which is output to the control unit 150.

  The GPS signal receiving unit 102 receives GPS signals transmitted from three or more GPS satellites orbiting a known orbit, and performs signal processing such as amplification, noise removal, and modulation on the GPS signals, and the mobile phone 100 Get the information needed to calculate the geographical location of

  The key input unit 103 has keys to which various functions such as a power key, a call key, a numeric key, a character key, a direction key, and an enter key are assigned, and these keys are operated by the user. Then, a signal corresponding to the operation content is generated and input to the control unit 150 as a user instruction.

  The audio processing unit 104 processes an audio signal output from the speaker 105 and an audio signal input from the microphone 106. That is, the audio signal input from the microphone 106 is subjected to signal processing such as amplification, analog-digital conversion, encoding, and the like, converted into digital audio data, and output to the control unit 150. Further, the audio data supplied from the control unit 150 is subjected to signal processing such as decoding, digital-analog conversion, amplification, etc., converted into an analog audio signal, and output to the speaker 105.

  The audio processing unit 104 supplies an audio signal to the charger 200 (see FIG. 3) on which the speaker 201 is mounted via the terminal T1.

  The display unit 107 is configured using a display device such as a liquid crystal display panel or an organic EL panel, for example, and displays an image corresponding to a video signal supplied from the control unit 150. For example, various information such as the telephone number of the callee at the time of outgoing call, the telephone number of the other party at the time of incoming call, the contents of the received mail and the outgoing mail, the date, time, the remaining battery level, and the standby screen are displayed.

  Further, the display unit 107 displays azimuth information based on the detection result of the geomagnetic sensor 108 when performing navigation using the GPS function or displaying a standby screen (see FIG. 4).

The geomagnetic sensor 108 detects the geomagnetism used for calculating the azimuth.
For example, the geomagnetic sensor 108 detects the geomagnetism in each axial direction with reference to a predetermined coordinate system (two axes or three axes) set on the circuit board in the housing of the portable electronic device 100. For detection of geomagnetism, various methods such as a method using excitation of a coil, a method using the Hall effect, and a method using a magnetoresistive element can be used.

  The storage unit 109 stores various data used for processing in the control unit 150. For example, a computer program provided in the control unit 150, an address book for managing personal information such as a telephone number or an email address of a communication partner, an audio file for playing a ringtone or an alarm sound, an image file for a standby screen, Various setting data, temporary data used in the program processing, etc. are stored.

  The storage unit 109 includes, for example, a non-volatile storage device (non-volatile semiconductor memory, hard disk device, optical disk device, etc.), a randomly accessible storage device (eg, SRAM, DRAM), or the like.

  The battery unit 111 includes, for example, a secondary battery (battery) such as a lithium ion battery or a nickel metal hydride battery, and supplies a power supply voltage generated in the battery to each unit of the device.

  FIGS. 3A and 3B are diagrams illustrating an example of the speaker-equipped charger 200 that charges the battery unit 111, in which the portable electronic device 100 is attached to the charger 200 (FIG. 3A) and in a detached state (FIG. 3A). FIG. 3 (B)) is shown respectively. FIG. 3 shows a geomagnetic sensor 108 incorporated in the portable electronic device 100.

  For example, as shown in FIG. 3A, the secondary battery of the battery unit 111 is charged in a state where the portable electronic device 100 is attached to the charger 200. That is, the charging terminal Tc provided in the portable electronic device 100 and the external terminal Tcc provided in the charger 200 are brought into contact with each other, and a charging current from the charger 200 to the battery unit 111 flows through these terminals.

  At this time, since the terminal T1 of the portable electronic device 100 and the input terminal Ti of the charger 200 are also electrically coupled, an audio signal can be supplied from the audio processing unit 104 to the speaker 201 of the charger 200.

  The charger detector 110 detects whether or not the portable electronic device 100 is attached to the charger 200. For example, the presence or absence of power supply from the charger 200 to the charging circuit (not shown) of the battery unit 111, the presence or absence of an electrical connection between the portable electronic device 100 and the battery unit 111, the presence or absence of physical contact, etc. are detected. To do.

  As a specific example to detect, the charger detection unit 110 detects a voltage applied between the charging terminal Tc (see FIG. 3) of the portable electronic device 100 electrically connected to the external terminal Tcc provided in the charger 200. It can be assumed that the portable electronic device 100 is connected to the charger 200 in a state where voltage is applied between the external terminals monitored. In the state where no voltage is applied between the external terminals, it can be detected that the portable electronic device 100 is not connected to the charger.

Returning to the description of FIG.
The control unit 150 comprehensively controls the overall operation of the portable electronic device 100.
That is, various processes of the portable electronic device 100 (voice calls performed via a circuit switching network, creation and transmission / reception of e-mails, browsing of Internet websites, navigation using a map, etc.) Operation of each unit described above (transmission / reception of signals in the wireless communication unit 101, reception of GPS signals in the GPS signal receiving unit 102, input / output of audio in the audio processing unit 104, Acquisition of geomagnetic data from the geomagnetic sensor 108, display of an image on the display unit 107, and the like).

  For example, the control unit 150 includes a computer that executes processing based on a program (operating system, application, etc.) stored in the storage unit 109, and executes the above-described processing according to a procedure instructed in this program. That is, instruction codes are sequentially read from programs such as an operating system and application programs stored in the storage unit 109 to execute processing.

When an instruction is input to the key input unit 103 to start navigation, the control unit 150 grasps the geographical position of the current location based on the GPS signal and displays it on the display unit 107 using a map.
For example, the control unit 150 receives the GPS signal by the GPS signal receiving unit 102 and transmits the information to the server device on the communication network by the wireless communication unit 101. The server device calculates the geographical position (for example, latitude, longitude, etc.) of the portable electronic device 100 based on the information of the GPS signal, and communicates the information regarding the position of the calculation result and the map around the position. To the portable electronic device 100 via The control unit 150 displays a map image representing the geographical position of the current location on the display unit 107 based on the information sent from the server device.

  The control unit 150 displays azimuth information on the display unit 107 when the navigation processing as described above is performed or when a normal standby screen is displayed. That is, the geomagnetic data detected by the geomagnetic sensor 108 is acquired, the direction is calculated based on the data, and this is displayed on the display unit 107 as direction information. For example, the control unit 150 calculates the azimuth at a constant cycle, and periodically updates the azimuth information displayed on the display unit 107 according to the calculation result.

  In addition, the control unit 150 stores an application program that decodes audio data that is compressed and stored in the storage unit 109 and converts the audio data into an analog audio signal in response to an input of a music playback instruction or the like from the key input unit 103. 109 can be read and executed. When this application program is activated, the application program displays a screen related to music playback on the display unit 107 so as to accept an instruction related to playback of audio data stored in the storage unit 109, or is played back based on an instruction from the key input unit 103. It accepts operations such as changing music, changing volume, interrupting playback, and ending. The accepted request is transmitted from the control unit 150 to the voice processing unit 104 and the display unit 107 for processing.

The direction information is displayed on the screen of the display unit 107 as an icon shaped like a compass, for example, as shown in FIG.
In the example of FIG. 4, the arrow indicated by the compass icon P <b> 1 represents a specific orientation (for example, north). When the orientation calculation result (azimuth data) changes according to the change in the orientation of the mobile electronic device 200, The direction of this arrow also changes according to.

  Consider a state in which the portable electronic device 100 having the above-described configuration is mounted on a charger 200 with a speaker as an external device, as shown in FIG. The charger 200 has a speaker 201, and the speaker 201 is a voice coil type speaker using a magnet. In this state, as described above, the charger detection unit 110 is in contact with the charging terminal Tc (see FIG. 1) provided in the portable electronic device 100 and the external terminal Tcc provided in the charger 200. And detecting that the portable electronic device 100 is connected to the charger.

  As shown in FIG. 3A, in the state where the portable electronic device 100 is attached to the charger 200 with the speaker, the orientation information based on the detection result of the geomagnetic sensor 108 is displayed on the display unit 107 of the portable electronic device 100. Consider the case.

  In order to display the azimuth information on the display unit 107 of the portable electronic device 100, the control unit 150 includes an azimuth calculation unit 151 and a display control unit 152 as components related to the calculation and display of the azimuth.

  The direction calculation unit 151 periodically acquires the detection result of the geomagnetic sensor 108, and calculates the direction based on the detection result. Then, the calculation result is output to the display control unit 152 as direction data. The display control unit 152 periodically acquires azimuth data from the azimuth calculation unit 151 and performs control so that azimuth information corresponding to the azimuth data is displayed on the display unit 107.

  By doing so, the orientation information is displayed on the screen of the display unit 107 as shown in FIG. Therefore, as shown in FIG. 3A, the orientation information is displayed on the display unit 107 of the portable electronic device 100 in a state where the portable electronic device 100 is attached to the charger 200 with the speaker.

  By the way, in the state of FIG. 3 (A), in order to complete the charging or interrupt the audio reproduction by the speaker 201 of the charger 200, the portable electronic device 100 is connected to the charger with the speaker as shown in FIG. 3 (B). It may happen that it is removed from the state.

  In the state of FIG. 3 (B), as shown in FIG. 3 (A), the speaker 201 of the charger 200 is separated from the state in which the speaker 201 is approaching the portable electronic device 100. Then, in the portable electronic device 100, the portable electronic device 100 is portable from the state in which the magnetic field from the magnet of the speaker and the magnetic field from the magnetized components constituting the portable electronic device 100 in the state of FIG. The magnetic field from only the magnetized components constituting the electronic device 100 is applied.

  However, once the portable electronic device 100 is attached to the charger 200 as shown in FIG. 3A, the components of the portable electronic device 100 and the magnet of the speaker 201 come close to each other. There is a risk of magnetizing. When the parts of the portable electronic device 100 are magnetized, the magnetization is maintained even if the portable electronic device 100 is removed from the charger 200 as shown in FIG.

  Therefore, in the state of FIG. 3B, as in the state of FIG. 3A, the display control unit 152 periodically acquires claim azimuth data from the azimuth calculation unit 151, and the azimuth corresponding to this is obtained. If control is performed so that information is displayed on the display unit 107, an incorrect orientation is indicated on the display unit 107.

  Therefore, the control unit 150 of the portable electronic device 100 displays the fact on the display unit 107 in order to notify the user that the offset calibration for the calculation of the direction by the geomagnetic sensor should be performed.

  In order to detect that the portable electronic device 100 is disconnected from the charger 200, the charger detector 110 monitors the voltage applied between external terminals (not shown) provided in the charger 200, and the monitoring result Is notified to the control unit 150. And in the state where the voltage is not applied between the said external terminals, the control part 150 should just judge that the portable electronic device 100 is not connected to the charger.

  Even when the orientation is not displayed on the display unit 107, when the portable electronic device 100 is removed from the charger 200, the magnetic field inside the portable electronic device 100 changes. Therefore, when the azimuth is displayed again on the display unit 107 after the portable electronic device 100 is removed from the charger 200, the control unit 150 of the portable electronic device 100 performs offset calibration for the calculation of the azimuth by the geomagnetic sensor. In order to notify the user to the effect, the fact is displayed on the display unit 107.

  When the control unit 150 of the mobile electronic device 100 displays on the display unit 107 that the offset calibration should be performed for the calculation of the azimuth by the geomagnetic sensor, for example, as shown in FIG. In addition, the display unit 107 can display “Please calibrate. Place the device horizontally and rotate it two times.”.

  The control unit 150 of the portable electronic device 100 performs control for notifying the user that the offset calibration for the calculation of the direction by the geomagnetic sensor should be performed, not only causing the user to perform calibration, but also performing calibration itself. You may control.

  For example, when the geomagnetic sensor mounted on the portable electronic device 100 is a three-axis sensor, calibration can be performed by the portable electronic device 100 itself. That is, when the geomagnetic sensor has three axes, in order to detect the geomagnetism in the three directions of the X axis, the Y axis, and the Z axis, by solving the simultaneous equations related to the strength of the geomagnetism in these three directions, This is because calibration can be automatically performed.

FIG. 5 is a flowchart showing an example of operations related to the calculation and display of the azimuth.
The bearing calculation unit 151 requests geomagnetic data from the geomagnetic sensor 108 at a predetermined cycle (step ST301). In response to this request, the geomagnetic sensor 108 periodically outputs geomagnetic data to the bearing calculation unit 151 (step ST302). The direction calculation unit 151 periodically calculates the direction based on the geomagnetic data acquired from the geomagnetic sensor 108 (step ST303). In this calculation, the offset value obtained by the calibration performed last time is added.

Display control unit 152 requests azimuth data from azimuth calculation unit 151 at a cycle longer than the azimuth calculation cycle (step ST401).
When the display control unit 152 requests orientation data in step ST401, the charger detection unit 110 detects that the charger 200 is connected to the portable electronic device 100. Therefore, the direction calculation unit 151 outputs the direction data calculated in step ST303 to the display control unit 152 (step ST402), and the display control unit 152 requests the display unit 107 to display the direction according to the direction data. (Step ST403). In this case, the orientation information displayed on the display unit 107 is information representing the actual orientation based on the detection result of the geomagnetic sensor 108.

  On the other hand, in step 403, after the display control unit 152 requests orientation display, there is a step ST501 for notifying the display control unit 152 that the charger detection unit 110 has been removed from the portable electronic device 100. There is also. In such a case, the display control unit 152 does not request the azimuth display as in step 403 but requests the display unit 107 to display that calibration should be performed as in step ST404.

  The external device connected to the portable electronic device 100 is not limited to the charger 200 with a coil speaker described in FIG. 3, but may be a USB device, an earphone, or a connector for a charging cable. Such an external device uses a metal that may be magnetized, and may also use a magnet. For this reason, there is a possibility that components constituting the mobile electronic device 100 may be magnetized, and the geomagnetic sensor mounted on the mobile electronic device 100 may cause an incorrect orientation to be calculated. It is necessary to perform

  As described above, according to the present invention, when an external device that generates a magnetic field is released from a state in which the external device is connected to a portable electronic device having a direction display function, the offset calibration for the calculation of the orientation by the geomagnetic sensor is performed. The purpose of this is to display information to the effect on the display unit of the portable electronic device. Therefore, even when the external device is removed from the portable electronic device, it is possible to avoid calculating the wrong direction as much as possible.

In addition, the portable electronic device 100 illustrated in FIG. 1 can be charged without using the charger 200 illustrated in FIG. 3.
The external connector Tio of the portable electronic device 100 shown in FIG. 1 is connected to the above-described battery charging circuit in addition to the purpose of inputting / outputting data by connecting the portable electronic device 100 to a personal computer. It also has a second charging terminal Td (the first charging terminal is Tc). The charging current from the AC charger connected to the commercial power source connected to the second charging terminal Td can be received and supplied to the charging circuit for charging.
The AC charger is also mounted with a coil for AC / DC conversion, and some magnetic field fluctuations occur. Therefore, similarly to when the charger 200 is used, when the state of the AC charger is changed from being connected to being not connected to the portable electronic device 100, the calibration control may be performed similarly.

  However, in the case where the speaker 201 like the charger 200 is not provided and a large magnetic field fluctuation does not occur depending on the presence / absence of connection, in addition to the determination of power supply to the charging circuit of the portable electronic device 100, the portable electronic device 100 The controller 150 determines that the charger 200 is connected to the portable electronic device 100 by detecting whether the charger 200 is in physical contact with the battery or not detecting that the external connector Tio is being used. If only the above-described calibration control (display for prompting calibration or start of automatic calibration) is performed, the minimum calibration control is required, and the user is not troubled. become.

  All of the above explanations assume a case where an external device that generates a magnetic field is removed from the portable electronic device. However, even when the external device is attached to the mobile electronic device, the mobile electronic device may perform control to notify the user that the calibration should be performed, or may perform control to perform the calibration itself.

Moreover, although this embodiment demonstrated the portable electronic device 100 as an example of the portable electronic device of this invention, this invention is not limited to this, For example, PHS (Personal Handyphone System), a portable game machine, a portable navigation apparatus, etc. The present invention can be applied to a portable electronic device that has a geomagnetic sensor and detects an orientation.
The communication terminal of the present invention is not limited to a mobile phone. For example, the present invention can be widely applied to portable terminals having a communication function, such as PDA (Personal Digital Assistants) and portable game machines.

It is a figure which shows the external appearance of a portable electronic device. It is a figure which shows the structural example of the portable electronic device which concerns on embodiment of this invention. It is a figure which shows an example of the charger with a speaker which charges the battery part of a portable electronic device. It is a figure which shows the example of a display of the direction at the time of standby. (A) is the state which shows the display of a normal azimuth | direction, (b) is the state which is displaying that calibration is performed. It is a flowchart which shows an example of the operation | movement regarding calculation and display of an azimuth | direction.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Portable electronic device, 101 ... Wireless communication part, 102 ... GPS signal receiving part, 103 ... Key input part, 104 ... Voice processing part, 105 ... Speaker, 106 ... Microphone, 107 ... Display part, 108 ... Geomagnetic sensor, 109 ... Storage unit, 110 ... Charger detection unit, 111 ... Battery unit, 150 ... Control unit, 151 ... Direction calculation unit, 152 ... Display control unit, 200 ... Charger, 201 ... Speaker

Claims (10)

A display for displaying information;
A geomagnetic sensor for detecting geomagnetism;
Calculate the direction based on the geomagnetism detected by the geomagnetic sensor,
A control unit for displaying the calculated orientation information on the display unit;
A portable electronic device comprising:
The controller is
When an external device that generates a magnetic field connected to the portable electronic device is separated from the portable electronic device, the user is notified that offset calibration should be performed for the calculation of the orientation by the geomagnetic sensor, or A portable electronic device characterized by performing calibration control for performing calibration itself. The portable electronic device according to claim 1, wherein the control unit performs control to display information indicating that calibration should be performed on the display unit. A detection unit for detecting connection with the external device;
The portable electronic device according to claim 1, wherein the control unit determines whether or not the external device is connected based on a detection result of the detection unit. The portable electronic device according to claim 3, wherein the external device includes a terminal, and the detection unit detects a connection with the external device by monitoring a voltage applied between the terminals. The control unit executes the calibration control when the connected external device is removed while the direction information is displayed on the display unit. 5. The portable electronic device according to any one of 4 above. If the connected external device is removed while the direction information is not displayed on the display unit, the control unit performs the calibration control when displaying the direction information on the display unit. The portable electronic device according to any one of claims 1 to 4, wherein the portable electronic device is any one of the above. The portable electronic device according to any one of claims 1 to 6, wherein the external device connected to the portable electronic device includes a magnet. The external device connected to the portable electronic device is a charger with a coil speaker, and the magnet provided in the external device is a magnet of the coil speaker. The portable electronic device of Claim 1. The portable electronic device according to any one of claims 1 to 7, wherein the external device connected to the portable electronic device is a USB device, an earphone, or a connector for a charging cable. A method for controlling a portable electronic device including a display unit that displays information including a direction based on geomagnetism detected by a geomagnetic sensor,
Determining a connection state of an external device that generates a magnetic field connectable to the portable electronic device;
When the connected state changes from a connected state to a released state, the display unit displays information indicating that offset calibration should be performed with respect to the display of the orientation by the geomagnetic sensor by magnetization. Steps,
A method for controlling a portable electronic device, comprising:

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