ST STM32 Nucleo Manuale utente

July 2010 Doc ID 17087 Rev 1 1/33

UM0908

User manual

STM32-based camera with ZigBee®connectivity

Introduction

This user manual describes the function of hardware boards on the “STM32 based camera

with ZigBee®connectivity” system (henceforth the system). The system is designed as two

separate hardware units. One of the hardware units (called the “camera unit”) consists of a

camera and ZigBee module interfaced with an STM32 microcontroller, while the other unit

(called the “monitoring unit”) consists of a TFT and ZigBee module interfaced with an

STM32 for viewing/monitoring jpeg images.

The STM32 microcontroller in the camera unit captures jpeg images from the camera (using

DMA) and transfers them onto the ZigBee network using an SPI controlled SN260 module.

The images are transferred into jpeg format which helps to save transfer time on the ZigBee

network. The camera unit can also record these images in the onboard memory (microSD

card) using a FAT file system. The user can record these images at the click of a button or

the present system can be expanded to record the images once motion is detected by the

camera (using a PIR sensor).

The monitoring unit scans for jpeg images on the ZigBee network. Once the images are

available on the network they are captured. These jpeg images are then converted into bmp

format for display on the onboard TFT. Both units can be powered either by battery or

through a USB. The system can be configured to go into standby mode as per user

configuration. This feature helps in reducing the power consumption of the system. With

these features, the system is useful for applications where certain areas need to be

monitored wirelessly, e.g. door intercoms and baby monitoring systems.

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Contents UM0908

2/33 Doc ID 17087 Rev 1

Contents

1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1 Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2 Hardware setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2.1 Setting the camera unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2.2 Setting the monitoring unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2.3 Hardware layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 System overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 System architecture description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Running the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1 Powering up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 Schematics of STEVAL-IFV001V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.1 Camera unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5 Bill of material of STEVAL-IFV001V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6 Schematics of the STEVAL-CCM003V1 . . . . . . . . . . . . . . . . . . . . . . . . . 19

7 Bill of material of the STEVAL-CCM003V1 . . . . . . . . . . . . . . . . . . . . . . 26

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

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UM0908 List of figures

Doc ID 17087 Rev 1 3/33

List of figures

Figure 1. Camera unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. Monitoring unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3. STEVAL-IFV001V1 front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4. STEVAL-IFV001V1 rear view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 5. System architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 6. Microcontroller schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 7. Connector schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 8. Camera ZigBee schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 9. Battery schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 10. Microcontroller schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 11. Bluetooth schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 12. TFT, touch, temperature and JTAG schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 13. Micro SD and ZigBee schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 14. Power schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 15. MEMS and USB schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 16. Touch schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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Getting started UM0908

4/33 Doc ID 17087 Rev 1

1 Getting started

1.1 Package

The STM32-based camera with a ZigBee connectivity package (STEVAL-IFV001V1)

includes the following items:

●Hardware content

– Demonstration board fitted with camera, micro SD card, and ZigBee module (also

called camera unit).

●Firmware

– Programmed in the system

– Object files of the firmware

●Documentation

– User manual (this document)

Note: The other hardware board (the monitoring unit) is available with the order code: STEVAL-

CCM003V1

1.2 Hardware setup

1. Power the camera unit first

2. Then wait for 2 to 3 seconds

3. Then power the monitoring unit.

1.2.1 Setting the camera unit

The camera unit is shown in Figure 1. This unit can be powered up either through a USB or

from a battery. The slider switch (SW3) present on the board is used for selecting the power

source. Before powering up the system, set this switch to the appropriate position, as per

Ta ble 1 :

Table 1. Power source setting

Switch (SW3) position Power source

1-2 USB

2-3 Battery

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UM0908 Getting started

Doc ID 17087 Rev 1 5/33

Figure 1. Camera unit

1.2.2 Setting the monitoring unit

The monitoring unit is shown in Figure 2 below. This unit is fitted with the ZigBee module

and TFT. The unit can be powered from a battery or from a USB supply. To select the power

source no hardware changes need to be made for this board. This unit needs to be powered

up after powering the camera unit (as the camera unit acts as the ZigBee coordinator).

Figure 2. Monitoring unit

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Getting started UM0908

6/33 Doc ID 17087 Rev 1

1.2.3 Hardware layout

The system is built around STMicroelectronics' cortex-based STM32F103RET6 in the 64-

pin LQFP64 package. The hardware layout of the camera unit is shown in Figure 3. For the

layout of the monitoring unit, please refer to the UM0874 user manual.

Figure 3. STEVAL-IFV001V1 front view

Figure 4. STEVAL-IFV001V1 rear view

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UM0908 System overview

Doc ID 17087 Rev 1 7/33

2 System overview

2.1 System architecture description

The architecture of the system is shown in Figure 5 below. The system works as a wireless

camera using ZigBee communication. The system has two units; one is the “camera unit”

while the other is the “monitoring unit”. Both units are based on the STM32 microcontroller.

Figure 5. System architecture

In the camera unit, the STM32 microcontroller is interfaced to the camera through GPIOs.

Through these GPIOs, the microcontroller takes data from the industry standard ITU 8-bit

interface of the camera. On powering up, the camera module is initialized through an I2C

interface for the streaming of jpeg images. During this Initialization appropriate registers in

the camera module are updated to get images as per requirements. In this unit, the camera

module is programmed for streaming jpeg images rather than bmp format, as this helps in

reducing the image transfer time on the ZigBee network.

Furthermore, this unit fully utilizes the advantages of the STM32 built-in DMA controller to

capture images from the camera module, therefore keeping the microcontroller free for other

purposes. The DMA controller is triggered through the STM32 timer which receives interrupt

on the rising edge of the PCLK signal. The DMA unit transfers the whole image in the

microcontroller's RAM from where it is sent onto the ZigBee network by the microcontroller

through the SPI based ZigBee module. During the time the image is transferred onto the

ZigBee network the DMA stays in STOP mode. Once the whole image is transferred onto

the ZigBee network the DMA captures another frame from the camera and the process is

repeated. In a case where there is no monitoring unit present in the system the camera unit

discards the present frame and captures the new frame.

In this system, the ZigBee network is established using the SN260 module which works on

channel 20. The camera unit acts as a coordinator and the monitoring unit acts as a node.

This camera unit is also capable of storing images in the uSD card available on the unit. The

images are stored using the FAT file system and therefore they can be easily viewed on a

PC using a card reader. The system can be triggered to capture images through a trigger

switch, or an external PIR sensor can be interfaced for this purpose. This unit is capable of

working both on USB power supplies and battery.

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System overview UM0908

8/33 Doc ID 17087 Rev 1

The other unit in the system, called the monitoring unit, is capable of capturing images from

the ZigBee network using the SN260 module. The STM32 microcontroller in this unit runs a

jpeg decompression algorithm which converts the captured jpeg images into raw bmp

format. After this conversion, the raw bmp image is displayed on TFT.

The principle parts of the system are described below:

●STM32 microcontroller

The system is based on an STM32F104RET6 microcontroller. The STM32 family of 32-bit

Flash Microcontrollers is based on the breakthrough ARM Cortex™-M3 core - a core

specifically developed for embedded applications. The STM32 family benefits from the

Cortex-M3 architectural enhancements including the Thumb-2 instruction set to deliver

improved performance with better code density and a significantly faster response to

interrupts, all combined with industry leading power consumption. For more details refer to

the stm32 literature available at st.com.

●Camera module - VS6724

The VS6724 is a CMOS color digital camera featuring low size and low power consumption

for mobile applications (PDA, mobile phones). Manufactured using ST 0.13 µm CMOS

imaging process, it integrates a high-sensitivity pixel array, a digital image processor, and

camera control functions.

The VS6724 is capable of streaming UXGA video up to 30 fps, with ITU-R BT.656-4 YUV

4:2:2 frame format, and M-jpeg compression. The VS6724 also supports the output of

uncompressed video data at UXGA resolution at up to 15 fps. It supports1.8 V/2.8 V

interface and requires a 2.4 V to 3.0 V analog power supply. If required, the VS6724 can

operate as a 2.8 V single supply camera. The integrated PLL allows for low frequency

system clock and flexibility.

●ZigBee module unit (SPZB260)

The SPZB260 is a low power consumption ZigBee module optimized for embedded

applications. It enables OEMs to easily add wireless capability to electronic devices. It has

an Integrated 2.4 GHz, IEEE 802,15,4-complaint transceiver. For more details refer to the

ZigBee literature available at st.com.

●USB

The system supports USB 2.0 compliant full speed communication via a mini USB type-B

connector. An ESD protection device (USBLC6) is also mounted to protect the USB bus.

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UM0908 Running the system

Doc ID 17087 Rev 1 9/33

3 Running the system

3.1 Powering up

The system is powered up in the following manner:

1. Powering up the camera unit

This unit needs to be powered up first. It can be powered from either a battery or USB.

Various states of the board are indicated by the corresponding LEDs. On powering up the

system using a USB, LED D3 lights up, which indicates the availability of 5 V on this unit

from the USB. Moreover, if a battery is not connected or uncharged, the LED D2 also lights

up (as shown in Figure 3 and 4).

The activity on this board is indicated by LED D1. If the system initializes well, the D1 LED

stays ON, otherwise it remains OFF, which indicates a problem on the board. On the other

hand, if the system is powered up using a battery then LED D2 & D3 remain OFF (to reduce

power consumption from the battery). However, LED D1 works as an activity LED, as

explained earlier.

Note: The availability of a micro SD card on the board does not disturb the system initialization.

Though in this case the recording feature does not function.

2. Powering up the monitoring unit

This unit should be powered up after powering the camera unit. Once this unit is powered

on, it tries to establish a connection with the ZigBee coordinator as the unit is acting as a

ZigBee node. Once the connection is established, the activity LED D1 on the camera unit

starts blinking as the camera unit starts transferring the image to the ZigBee network.

The monitoring unit displays the captured images on the TFT after decoding them from jpeg

format to bmp format.

3. Capturing images

To use the recording feature, make sure the micro SDcard is plugged into the system before

powering it up. To capture a picture at a particular moment, press the capture switch button

(SW1). At one click of the button, one jpeg image is saved onto the micro SDcard using the

FAT file system which can be seen on the desktop machine using a card reader. This feature

is useful for applications where a picture needs to be captured and saved in local memory at

some external trigger (e.g. trigger from PIR sensor).

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Schematics of STEVAL-IFV001V1 UM0908

10/33 Doc ID 17087 Rev 1

4 Schematics of STEVAL-IFV001V1

4.1 Camera unit

Figure 6. Microcontroller schematic

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www.BDTIC.com/ST

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