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Value line evaluation board CEC demonstration

AN3127

Doc ID 16896 Rev 2

Figure 19.

Physical and logical addresses display

4.5

Checking the connected devices

Before displaying the available follower addresses, the CEC device checks the connected
devices by sending a <Polling Message> to all logical addresses. If the <Polling Message>
is acknowledged, then the device retains that address. After that step, only the addresses of
the connected devices are displayed.

If no device is connected, only the broadcast address is available.

If a new device is connected after the connected device check step, its address is
automatically added to the list of available addresses.

4.6 Displaying

CEC

send/receive information on the LCD

The LCD screen is divided into two parts as shown in

Figure 20: CEC menu

●

a subscreen that shows the CEC receive information: receive status, sender address

●

a subscreen used to select the follower address and the command to send

Figure 20.

CEC menu

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Содержание STM32F100 Series

Страница 1: ...nics control HDMI CEC controller peripheral that supports the HDMI CEC v1 3a protocol The HDMI CEC controller provides a hardware support of this protocol and it supports the whole set of features off...

Страница 2: ...ssing 13 1 4 7 Logical address allocation 13 1 5 STM32F100xx s HDMI CEC controller 14 1 5 1 Main features 15 1 5 2 HDMI CEC advanced features 16 2 Hardware environment 18 2 1 HDMI connector 18 2 1 1 I...

Страница 3: ...AN3127 Contents Doc ID 16896 Rev 2 3 36 4 6 1 Receive information subscreen 31 4 6 2 Send information subscreen 32 5 Conclusion 34 6 Revision history 35...

Страница 4: ...27 4 36 Doc ID 16896 Rev 2 List of tables Table 1 Logical addresses 13 Table 2 HDMI connector pinout 19 Table 3 STM32F100xx and HDMI CEC connection 22 Table 4 High level functions 25 Table 5 Document...

Страница 5: ...7 Figure 10 HDMI cable 18 Figure 11 Application schematic 20 Figure 12 Electrical schematic proposal for STM32100B EVAL 21 Figure 13 Electrical schematic proposal for STM32100E EVAL 21 Figure 14 Examp...

Страница 6: ...that has the ability to play media like a DVD player Recording device a device that has the ability to record a source such as an internal tuner or an external connection Source device a device that...

Страница 7: ...o 10 audiovisual devices through standard HDMI cabling All transactions on the CEC line consist of an initiator and one or more followers The initiator is responsible for sending the message structure...

Страница 8: ...llower that needs to reject a broadcast message The header consists of the source logical address field and the destination logical address field Note that the address 0xF is specially used for broadc...

Страница 9: ...CEC communication By definition the HDMI system architecture consists of sources and sinks A given device may have one or more HDMI input s and output s Each HDMI input on the device should follow all...

Страница 10: ...cification 100 kHz maximum clock rate The I2C bus is a standard two wire clock and data serial databus protocol Refer to the I2C specification for details Note that a HDMI sink may hold off the DDC tr...

Страница 11: ...0 The source reads Enhanced EDID extension data at DDC address 0xA0 using segment pointer 0x60 1 4 3 Hot plug detect HPD signal A HDMI sink should not assert high voltage levels on its HPD pin when th...

Страница 12: ...will read its physical address from the EDID on the CEC connected output Each sink and repeater is responsible for generating the physical address of all source devices connected to that device by app...

Страница 13: ...EC_OAR register and in the upper nibble of the first byte of the transmitted message All CEC devices therefore have both a physical and a logical address whereas non CEC devices only have a physical a...

Страница 14: ...e keeps that address This procedure continues until all possible type specific addresses have been checked if no type specific addresses are available the device should take the unregistered address 1...

Страница 15: ...o match those of the TV One touch record used to make recordings by pressing a single button Timer programming any device can program a timer to start stop audio video recording System information all...

Страница 16: ...LINE Block acknowledge error ACKE Start bit error SBE Rx block transfer finished error RTBFE Bit period error BPE Bit timing error BTE error free mode to allow safe communication with non tolerant CEC...

Страница 17: ...st before entering the Stop mode the CEC prescaler should be reprogrammed to be in line with the HSI frequency by disabling the CEC peripheral To do so write PE 0 and wait until PE goes low writing th...

Страница 18: ...2F100xx CEC solution CEC peripheral plus ESD protection circuit is fully compliant with the HDMI 1 3 standard The solution is already implemented on Value line evaluation boards Two HDMI connectors ar...

Страница 19: ...s are power supply dependent An I C bus device with fixed input levels of 1 5 V and 3 V can have its own supply voltage A pull up resistor has to be connected to a 5 V 10 supply When devices with fixe...

Страница 20: ...Hardware environment AN3127 20 36 Doc ID 16896 Rev 2 Figure 11 Application schematic...

Страница 21: ...re 13 Electrical schematic proposal for STM32100E EVAL 2 K7 6 6 2 K7 2 0 3 3 6 6 0 6 6 0 6 54 3 3 5 3 3 0 N 2 0 2 0 2 0 N 2 K7 6 6 N 2 K7 2 K7 2 K7 2 K7 2 K7 4 N PIN PIN PIN PIN PIN 3 7 7 7 7 2 K7 6 6...

Страница 22: ...valuation board to other Value line evaluation boards using HDMI cables or a simple wire between all CEC device lines PB8 If you choose the second solution do not forget to connect the grounds of all...

Страница 23: ...he package Libraries folder contains all CMSIS files and the STM32F10x standard peripheral s Drivers CMSIS subfolder contains the STM32F10xxx CMSIS files device peripheral access layer and core periph...

Страница 24: ...subfolders contain tool dependent preconfigured projects and workspaces Utilities folder STM32_EVAL implement an abstraction layer that interacts with the human interface resources buttons LEDs LCD a...

Страница 25: ...ations and perform high end functionalities like sending and receiving messages Table 4 High level functions Function name Description HDMI_CEC_Init Initializes the HDMI CEC controller Enables the CEC...

Страница 26: ...eportPhysicalAddress Reports the physical address to all other devices thus allowing any device to create a map of the network HDMI_CEC_CommandCallBack Handles the CEC command s receive callback Table...

Страница 27: ...joystick push buttons or the s r l u and d keyboard keys respectively depending on the selected configuration Figure 17 CEC demonstration flowchart shows the menu system of the CEC demonstration After...

Страница 28: ...dule Repeat from step 6 if you want to select another follower and send another command Reset the device if you want to select a different device type Figure 17 CEC demonstration flowchart 3YSTEM RESE...

Страница 29: ...is used to allocate the physical address of each device If no CEC error is generated the CEC device executes the logical address allocation algorithm 4 4 Logical address allocation The selected devic...

Страница 30: ...dress After that step only the addresses of the connected devices are displayed If no device is connected only the broadcast address is available If a new device is connected after the connected devic...

Страница 31: ...erands Figure 21 Receive flowchart Figure 22 Receive information subscreen shows that the device has correctly received the frame from the sender with address 0x5 Sender address 0x5 The number of byte...

Страница 32: ...name 4 6 2 Send information subscreen This subscreen is used to navigate among the connected device addresses by using the RIGHT and LEFT buttons After selecting the follower address you have to selec...

Страница 33: ...6 Figure 23 Send flowchart Figure 24 Select CEC command EGIN ERROR 4 9ES O 9ES 2ETURN THE ERROR STATUS AI 3END FIRST BYTE AND SET 4 IF CURRENT BYTE IS THE LAST TO BE SENT ISABLE 4 AND DISPLAY THE SEND...

Страница 34: ...uation board Note The HDMI CEC communication can be enhanced by adding Infrared protocols so that the user commands can be generated in a more flexible way The STM32 Value line devices can easily hand...

Страница 35: ...Revision history Doc ID 16896 Rev 2 35 36 6 Revision history Table 5 Document revision history Date Revision Changes 01 Mar 2010 1 Initial release 11 Oct 2010 2 Updated for high density value line de...

Страница 36: ...ARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION OR INFRINGEMENT OF ANY PATENT COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT UNLE...

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