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OLIMEX IMX233-NANO+I [11/36] How to use the i2c spi uart

below. These guides are not created nor tested by Olimex, however, they are worth a look:

https://github.com/koliqi/imx23-olinuxino

http://eewiki.net/display/linuxonarm/iMX233-OLinuXino

http://www.jann.cc/2012/08/23/building_a_kernel_3_x_for_the_olinuxino_from_sources.html

2.7 How to use the I2C, SPI, UART

There are number of examples with our extension module boards to achieve the mentioned

interfaces using the UEXT connector. The examples might be used as examples for I2C, SPI or

UART communication. You can find them at our GitHub page:

https://github.com/OLIMEX/OLINUXINO/tree/master/SOFTWARE/iMX233

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Disclaimer 2
There is no warranty for the design materials and the components used to create imx233 olinuxino nano they are considered suitable only for imx233 olinuxino nano 2
Chapter 1 overview 5 3
Chapter 2 setting up the olinuxino board 8 3
Chapter 3 olinuxino board description 12 3
Chapter 4 the imx233 microcontroller 13 3
Chapter 5 control circuity and hardware modules 16 3
Chapter 6 connectors and pinout 18 3
Disclaimer 2 3
Table of contents 3
Chapter 7 block diagram and memory 30 4
Chapter 8 schematics 33 4
Chapter 9 revision history and support 34 4
Chapter 1 overview 5
Features 5
Introduction to the chapter 5
100mbit ethernet for the wired network of olinuxino maxi 150mbit for the wifi following 811 2n standard 6
150 mbit ethernet 6
All three boards have the option to work with mod wifi_rtl8188 which is usb wifi modem with rtl8188cu chip and can be purchased separately mod wifi_rtl8188 can be connected to any of the olinuxino boards via the usb 6
Audio in connector 6
Audio out connector 6
Breadboarding 6
Dc power supply 6
Dimensions 6
Gpio connector 6
However there are significant differences in the dimensions the peripherals available and the power options between the different boards 6
Of buttons 6
Olinuxino mini has additional option of having rtl8188cu hardware mounted if you wish rtl8188cu embedded in the device you should purchase olinuxino mini wifi choosing the embedded wifi option will leave your usb hosts available for use 6
Olinuxino nano olinuxino micro olinuxino mini olinuxino maxi 6
Power jack 6
Processor 6
Ram mb 6
Reset button 6
Table of comparison 6
The design of all the imx233 boards follows the same pattern which makes the transition between different olimex imx233 boards easier 6
The olinuxino family 6
There is an easy access to the power pin holes however especially if you use a breadboard 6
Uext connector 6
Usb hosts 6
Vga connector 6
Organization 7
Target market and purpose of the board 7
Chapter 2 setting up the olinuxino board 8
Electrostatic warning 8
Introduction to the chapter 8
Requirements 8
Powering the board 9
Prebuilt software 9
Building the linux image 10
Using bitburner 10
How to use the i2c spi uart 11
Chapter 3 olinuxino board description 12
Here you get acquainted with the main parts of the board note the names used on the board differ from the names used to describe them for the actual names check the olinuxino board itself 12
Introduction to the chapter 12
Layout bottom view 12
Layout top view 12
Chapter 4 the imx233 microcontroller 13
Introduction to the chapter 13
The microcontroller 13
Chapter 5 control circuity and hardware modules 16
Introduction to the chapter 16
Power supply circuit 17
Chapter 6 connectors and pinout 18
Debugging interfaces 18
Introduction to the chapter 18
U_debug 18
Consider the software settings required to switch from sjtag to 6 pin jtag and vice verse referring to the imx233 manual for instance 19
Hw_digctl_ctrl_use_serial_jtag 0 0 selects whether the one wire serial jtag interface or the alternative six wire parallel jtag interface is used 0 parallel six wire jtag is enabled and is mapped to a collection of module pins that must be enabled by programming their muxsel bits in the pin control block 1 serial jtag is enabled and uses the dedicated debug pin the rom bootcode writes this field prior to enabling jtag selecting which type of jtag pin signaling to use old_jtag 0 0 use six wire parallel jtag mode serial_jtag 0x1 use one wire serial jtag mode 19
It is good idea to check the datasheet of the imx233 processor for all the options in the digital control block the processor s datasheet should be always the first piece of paper you consult when dealing with electronics 19
Jtag debug 19
The hw_digctl_ctrl_use_serial_jtag bit in the digital control block selects whether the serial jtag interface or the alternative six wire parallel jtag interface is used 19
The important thing is that these pins are multiplexed with the sd card signals in order to use the 6 pin jtag you will have to stop using the sd card note also that the classic jtag interface comes without plastic header mounted so in order to use it you will need to use wires for connection 19
This option allows you to use the classic 6 pin parallel jtag not including gnd and vcc there are pads left for this option at the top of the board over the sd card holder 19
You can also check the pin names at the top and at the bottom of the board around the u_debug pins 19
Notice that the pad numeration is written at the bottom of olinuxino nano under the microsd card connector please check the manual part for microsd card for a schematic of the pins 20
Sd mmc slot 20
The microsd card slot is a standard 8pin connector 20
We have tested a number of microsd cards on the olinuxino boards and all of them worked fine regardless manufacturer or capacity however keep in mind that some of the lower quality microsd cards might draw too much current from the slot which might cause power state problems if you suspect the microsd card is causing problems please try using another one of better quality for better results 20
Ensure the board is soft powered down before removing the sd card unplugging the sd card during board operation or removing the power supply during board operation might corrupt the sd card rendering it useless 21
It is a good idea to be sure there are currently no read write operations performed when ejecting the sd card or you might corrupt your linux os if you corrupt the sd card you can download a new image from the imx233 wiki article at our web site 21
Note that if you wish to use our uext modules the jumpers should be set to hardware i2c position 21
Note the three jumpers pin29 soft_cl pin22 lcd_en i2c_scl pin28 soft_sda3 pin21 lcd_hsync i2c_sda and cs_sw open cs_hw close which by default are set to a hardware i2c they can be used to set the uext to a hardware spi additionally the chip select might be left open 21
Olinuxino board has uext connector and can interface olimex s uext modules for more information on uext please visit https www olimex com products modules uext 21
Uext module 21
When removing the card please make sure that you release it from the connector by pushing and not by pulling the card directly this can damage both the connector and the microsd card 21
Controlled by smt jumper 22
The uext connections are visible below 22
Con1 and con2 gpio connectors 23
Please note that pin holes 15 20 are not present they are left to keep the 0 step free space for perfect breadboard fit 23
The pins that haven t been used by the peripherals mounted or that are considered important are lead out to the two rows of pins con1 and con2 near the edges of the board they allow the user to attach additional hardware check readings perform hardware debug etc the gpio pin column shows connector number and does not represent the naming on the bottom of the board 23
Signals in yellow color are the headphones out signals signals in blue color are the line in signals 24
The hardware is associated differently in the linux following the gpio naming conventions suggested in the imx233 datasheet you can check the connection between linux naming of the pin olimex naming of the pin and the consecutive connector pin number in the table below the ones filled with not implemented doesn t have linux support by the time of writing and will be updated overtime linux gpio is the one you should use in linux the one in the datasheet olinuxino name is the pin as written on the bottom of the board olinuxino gpio connector is the consecutive number of pins with bat being pin 1 and gnd 40 note that if olinuxino name starts with p and then is followed by a number x the px is the name written on the bottom of the board under the connector with white ink if olinuxino name is other text it is a signal used for the hardware of the board but still can be controller by the linux it can t be found at the gpio connector though 24
Below you can find the gpio con1 and con2 as seen in the schematic 25
It is a good idea to use an external usb hub splitter to connect more than one usb device to the board 25
The signals follow the familiar and standard usb host pattern 25
The usb host connector is a vertical one and it is side mounted this is done to save space and to optimize the dimensions of the board 25
There is numeration of the pinholes on the top of the board 25
Usb host connector 25
Battery connector 26
External power pins 26
More info about the power supply can be found in chapter 5 of this manual 26
The nano board lacks power jack if you wish to use regulated 5vdc you should provide it at pins 1 and 2 at the con2 row of pins note that pin 1 is the vdc pins and pin 2 is the gnd pin 26
The pins are also written on the bottom of the board under the connector 26
The voltage of a 3 v lipo battery would be enough to power the board it uses the standard 26
You would damage the board if you short circuit the power supply to these pins 26
Boot mode positions 27
Additional hardware components 28
Boot mode selecting jumpers 28
Ch cs and dh ds 28
Cs and dh ds 28
Cs_sw open cs_hw close 28
Css csh 28
Jumper description 28
Note that if you wish to use our uext modules the jumpers should be set to hardware i2c position 28
Please note that all the jumpers on the board are smd type if you feel insecure in your soldering cutting technique it is better not to try to adjust the jumpers additionally for the nano board the jumpers are pretty tiny to keep the board factor as small as possible if you are not good at soldering you might damage the board permanently 28
The boot mode is discussed in chapter 6 of this manual 28
The components below are mounted on olinuxino but are not discussed above they are listed here for completeness 28
The default position is cs_hw closed hardware cs 28
The default positions of these jumpers of latest revisions of the board are cs ds hardware i2c 28
This jumper controls whether the i2c cs chip select is software or hardware 28
Those two jumpers must be moved together there are two available options configuring software i2c interface cs ds or hardware i2c interface ch dh 28
Accessories 29
Usb serial cable f 29
Below is the table with some of the most frequently used addresses for full list of addresses check the manual released by freescale chapter memory map 30
Chapter 7 block diagram and memory 30
Introduction to the chapter 30
Memory addresses 30
On the next page you can find a memory map for this family of processors it is strongly recommended to refer to the original datasheet released by freescale for one of higher quality 30
Processor block diagram 31
Physical memory map 32
Chapter 8 schematics 33
Eagle schematic 33
Introduction to the chapter 33
Physical dimensions 33
Chapter 9 revision history and support 34
Document revision 34
In this chapter you will find the current and the previous version of the document you are reading also the web page for your device is listed be sure to check it after a purchase for the latest available updates and examples 34
Introduction to the chapter 34
Board revision 35
Useful web links and purchase codes 35
For product support hardware information and error reports mail to support olimex com note that we are primarily a hardware company and our software support is limited 36
Olimex 2015 imx233 olinuxino nano user s manual 36
Page 36 of 36 36
Please consider reading the paragraph below about the warranty of olimex products 36
Product support 36
The full text might be found at https www olimex com wiki gtc warranty for fut 36

OLIMEX IMX233-NANO+I [11/36] How to use the i2c spi uart

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