I2c Serial Port Adapter

Www. mellanox. com Mellanox Technologies ConnectX4 VPI Single and Dual Port QSFP28 Adapter Card User Manual PN MCX453AFCAT, MCX454AFCAT, MCX455AFCAT, MCX456A. The Serial Peripheral Interface bus SPI is a synchronous serial communication interface specification used for short distance communication, primarily in embedded. Microcontroller PIC Projects are categorized on the basis of microcontroller applications. Microchip pic microcontrollers belongs to modern family of MCUs. I2. C Wi. Fi and Ethernet adaptor. Converting a 6. 0 router for wireless. The Linksys WRT5. G is one of several similar. BG Wifi routers using a Broadcom chipset. These. run Linux, and with an easy firmware changeand can be. I2. C 2 PC or BL2. While they are Wi. Fi devices, they are just as useful. Our I2. C 2 PC can also be used as an RS2. Linksys to a PCs serial or USB ports for. What follows is a work in progess so come back and see. What type of WRT5. I2c Serial Port Adapter' title='I2c Serial Port Adapter' />G to get The current versions WRT5. G v. 2. 0 and WRT5. GS have built in. There were old V1 units which required fitting a. WRT5. 4G 4. MB Flash, 3. M Ram, but 1. 6M Ram is available, and 4. Instant, No Hassle Connections. Universal Serial Bus USB connects more than computers and peripherals. It has the power to connect you with a whole new world of PC. The original comprehensive course designed for new and intermediatelevel Arduino Makers. M. is free. ie 1. M sees to be unusableWRT5. GS 8. M Flash, 3. M Ram, 2. 0M is free. GS version has more flash and far more free ram, and so is a. The WRT5. 4G is fine for simple jobs. HTB1tJrgLpXXXXbFaXXXq6xXFXXXy/5-%D1%88%D1%82-1602-%D0%9F%D0%B5%D1%80%D0%B5%D1%85%D0%BE%D0%B4%D0%BD%D0%B0%D1%8F-%D0%9F%D0%BB%D0%B0%D1%81%D1%82%D0%B8%D0%BD%D0%B0-2004-%D0%96%D0%9A-IIC-I2C-%D0%98%D0%BD%D1%82%D0%B5%D1%80%D1%84%D0%B5%D0%B9%D1%81-lcd1602-I2C-%D0%96%D0%9A-%D0%90%D0%B4%D0%B0%D0%BF%D1%82%D0%B5%D1%80-%D0%B4%D0%BB%D1%8F-arduino.jpg' alt='I2c Serial Port Adapter' title='I2c Serial Port Adapter' />Note that there seem to be many devices based on the Broadcom. Linux, but not all have serial ports or firmware that. WRT5. 4Preparing the I2. C 2 PC adaptor Connect the OPTO serial port on the adaptor to port 1 of. Linksys with 1k resistors in the data lines. The. I2. C 2 PC runs off 5. V, the Linksys is 3. Vinsert the extra selection jumpers and set the jumpers to. OPTO serial on the I2. C 2 PC adaptor. The opto. TTL level serialYou can power the I2. C 2 PC from the Linksys 1. V supply. it draws negligible extra current. On the Linksys Router. Connect to the the Linsys through the LAN ethernet port. By default the Linksys is at 1. Load the Sveasoft. Firmware onto your Linksys. Use Alchemy or. Samadhi. Satori versions lack sttyEnable Telnet on the Linksys from the administration. For proper security you should be using SSH not. Telnet. Login as root password. Telnet from your PC to 1. From. Windows I recommend using PUTTY. You should have a linux command line running on the. Now I assume that you do have the serial comms tested and. To understand the I2. C 2 PC commands below you need to. BL2. 33 datasheet. Setup the Linksys Serial Port. First you need to change the serial port setups. Turn off the. echo and change the baud rate. F devtts1 echo 5. F devtts1 a will. Note the odd port numbering. Linux boxes. Also we are using port. Talk to the I2. C Bus. To understand the I2. C commands that follow, see the BL2. To send 0x. 5A ie binary 0. PCF8. 57. 4 8 bit IO chip. I2. C address 0x. S4. 05. AP devtts1. To send any other byte change the 5. A to the desired hex. To see what is returned to the Linksys. C will kill the catcat devtts1. To capture it to a file far more useful. The. makes the cat command run in the background. Note that the cat command will keep running until it. D or you kill it. The received chars will be. Touchpal X Premium there. PCF8. 57. 4 send S4. Pecho S4. 10. 1P devtts1. Now the returned data is being captured to tmpplay. To. see what is in the file more tmpplay. Now all you have to do is write a script to periodically issue. I2. C 2 PC with echo, and pause with sleep. In the BL2. 33 datasheet. BL2. 33 so it just. The cat command will keep running until an EOT. You can examine the file with. TFTP to download it to a PC through. OK so lets make a simple data logger to record temperature with a TMP1. PCF8. 57. 4. Use cat tmplogit to. D to end it. stty F devtts1 echo 5. S9. 00. 16. 0W0. 0P devtts1 initialise TMP1. S4. 10. 1P devtts1 read 1 byte from a PCF8. S9. 10. 2P devtts1 read temperature from TMP1. Now make it executable and run it in the backgroundchmod 7. Now the port is read and stored in play. You can use tail to put a limit on how long the. The file is just full of hex so its easy to process. One advantage of this approach to datalogging is that it is a. V battery or UPS on the Linksys router. PC. A gelcell will keep the data collection going until. PC can downlaod the files again. If you just want to capture a single lot of data and have. T command in the BL2. For example this is ideal for dumping. T0. 4 devtts1. Time Stamping the files. Of course for datalogging it is useful to store the datetime. Handily the Linksys is able to get its time. NNTP server, so the time should always be just. Personally I prefer to not use english datetimes but. It is. easier to read, sort and plot. To append the date number to a. To set the time in the router it is best to configure it to. NTP timeserver. If this isnt possible use. The format for stting the data is date s. MMDDhhmmCCYY eg Jul 1 2. Tools. Download and install the following Putty and Puttygen. Win. SCPSveasoft Firmware Satori version NOT AVAILABLE YETInstall the Sveasoft firmware from the routers webpage. See http docs. SV Upgrading. Firmware. Enable SSHD on the administration page and save. Until you. save the dialog for the key does not appear. Run Puttygen and make an SSH2 key according to, and copy the. SSH part on the admin page. Save. Now you should be able to connect using putty and login as. Win. SCP should be able to connect using the same key file and. Note that most dirs are read only. Upload files. Try the logging script. When you are happy it works, run logsetup to setup the nvram. Check the nvram, then nvram commit to write the. Now the logger should run on boot. Copy Logger script to NVRam. We need the logger script to be non volatile so it can start. So I copy it to an NVRam variable. This. takes a couple of secondsnvram get logscript tmplogscript restore to file. NVRam seems to be a 3. I e d bigscript. Keeping Data from getting too big. The ram space is limited, so it is better for the data size to. Tail can be used to limit the number of lines in the. Since the length of each line is constant, the max file. Note that when you try to reflash the rom you need enough free. You may have to delete all. Transferring Files. File transfers can be view by which end the command is. From Windows PC end. For GUI file transfers Win. SCP is. recommended. The PSCP. program can be used for automated commandline transfers. Presently the 2. 00. Note that Putty, pscp, Win. SCP all use the same key file. Presently HTTPD on the WRT requires a login password, and will. TFTPD on WRT appears only able to upload the bin file to tmp. From WRT command line. Current Issues. Most up to date firmware lacks STTY command. How do I make it run at power on I2. C 2 PC to Linksys WRT5. Ghttp www. rwhitby. Into the Linksys socket fit two 1k resistors and connect to a. Connect pins 1. and 5 of the ribbon. DO NOT connect pin. I2. C 2 PC to pin 1 of the Linksys 3. LinksysFit 2 micromatch females into the empty holes on the I2. C 2 PC. The connector closest to the FTDI is used when you are connecting. Linksys to the BL2. I2. C adaptor. The connector next. BL2. 33 is used when you want to connect the Linksys to a. PCs serial port for testing. BL2. Function. Direction. Linksys PinI2. C 2 PC Pin3. V 1nc. TXDOut Linksys. RXDIn Linksys. 53nc 7 GND 9. Linksys Serial Interface Run Realterm. Windows PC. Set realterm to 9. Remove the BL2. 33 from its socket on the I2. C 2 PCConnect the Linksys port 1 to the port next to the BL2. Connect to the PC with the RS2. USB port. make sure. I2. C 2 PC are removeduse the echo and cat commands from Telnet to test. How to setup SSHOver to Zak Mc. Rofl. Ok it took me some time to figure it out so heres how you can. WRT5. 4G 1 Get Pu. TTY. http the. Get Pu. TTYgen. http the. Run Pu. TTYgen, select SSH2 RSA at parameters, 1. Press. generate, it will create a publicprivate key pair from your. IC Wikipedia. Not to be confused with IS. IC Inter Integrated Circuit, pronounced I squared C, is a multi master, multi slave, packet switched, single ended, serialcomputer bus invented by Philips Semiconductor now NXP Semiconductors. It is typically used for attaching lower speed peripheral ICs to processors and microcontrollers in short distance, intra board communication. Alternatively IC is spelled I2. C pronounced I two C or IIC pronounced I I C. Since October 1. 0, 2. IC protocol. However, fees are required to obtain IC slave addresses allocated by NXP. Several competitors, such as Siemens AG later Infineon Technologies AG, now Intel mobile communications, NEC, Texas Instruments, STMicroelectronics formerly SGS Thomson, Motorola later Freescale, now merged with NXP2, Nordic Semiconductor and Intersil, have introduced compatible IC products to the market since the mid 1. SMBus, defined by Intel in 1. IC, defining a stricter usage. One purpose of SMBus is to promote robustness and interoperability. Accordingly, modern IC systems incorporate some policies and rules from SMBus, sometimes supporting both IC and SMBus, requiring only minimal reconfiguration either by commanding or output pin use. RevisionseditThe history of IC specification releases In 1. Hz IC system was created as a simple internal bus system for building control electronics with various Philips chips. In 1. 99. 2, Version 1 added 4. Hz Fast mode Fm and a 1. This was the first standardized version. In 1. 99. 8, Version 2 added 3. MHz High speed mode Hs with power saving requirements for electric voltage and current. In 2. 00. 0, Version 2. In 2. 00. 7, Version 3 added 1 MHz Fast mode plus Fm using 2. A drivers, and a device ID mechanism. In 2. 01. 2, Version 4 added 5 MHz Ultra Fast mode UFm for new USDA data and USCL clock lines using push pull logic without pull up resistors, and added an assigned manufacturer ID table. It is only a unidirectional bus. In 2. 01. 2, Version 5 corrected mistakes. In 2. 01. 4, Version 6 corrected two graphs. This is the most recent standard. IC uses only two bidirectional open drain lines, Serial Data Line SDA and Serial Clock Line SCL, pulled up with resistors. Typical voltages used are 5 V or 3. V, although systems with other voltages are permitted. The IC reference design has a 7 bit or a 1. Common IC bus speeds are the 1. Recent revisions of IC can host more nodes and run at faster speeds 4. Fast mode, 1 Mbits Fast mode plus or Fm, and 3. Mbits. High Speed mode. These speeds are more widely used on embedded systems than on PCs. There are also other features, such as 1. Note the bit rates are quoted for the transactions between master and slave without clock stretching or other hardware overhead. Protocol overheads include a slave address and perhaps a register address within the slave device, as well as per byte ACKNACK bits. Thus the actual transfer rate of user data is lower than those peak bit rates alone would imply. For example, if each interaction with a slave inefficiently allows only 1 byte of data to be transferred, the data rate will be less than half the peak bit rate. The maximal number of nodes is limited by the address space and also by the total bus capacitance of 4. F, which restricts practical communication distances to a few meters. The relatively high impedance and low noise immunity requires a common ground potential, which again restricts practical use to communication within the same PC board or small system of boards. Reference designeditThe aforementioned reference design is a bus with a clock SCL and data SDA lines with 7 bit addressing. The bus has two roles for nodes master and slave Master node node that generates the clock and initiates communication with slaves. Slave node node that receives the clock and responds when addressed by the master. The bus is a multi master bus, which means that any number of master nodes can be present. Additionally, master and slave roles may be changed between messages after a STOP is sent. There may be four potential modes of operation for a given bus device, although most devices only use a single role and its two modes master transmit master node is sending data to a slave,master receive master node is receiving data from a slave,slave transmit slave node is sending data to the master,slave receive slave node is receiving data from the master. The master is initially in master transmit mode by sending a start bit followed by the 7 bit address of the slave it wishes to communicate with, which is finally followed by a single bit representing whether it wishes to write 0 to or read 1 from the slave. If the slave exists on the bus then it will respond with an ACK bit active low for acknowledged for that address. The master then continues in either transmit or receive mode according to the readwrite bit it sent, and the slave continues in its complementary mode receive or transmit, respectively. The address and the data bytes are sent most significant bit first. The start bit is indicated by a high to low transition of SDA with SCL high the stop bit is indicated by a low to high transition of SDA with SCL high. All other transitions of SDA take place with SCL low. If the master wishes to write to the slave, then it repeatedly sends a byte with the slave sending an ACK bit. In this situation, the master is in master transmit mode, and the slave is in slave receive mode. If the master wishes to read from the slave, then it repeatedly receives a byte from the slave, the master sending an ACK bit after every byte except the last one. In this situation, the master is in master receive mode, and the slave is in slave transmit mode. The master then either ends transmission with a stop bit, or it may send another START bit if it wishes to retain control of the bus for another transfer a combined message. Message protocolseditIC defines basic types of messages, each of which begins with a START and ends with a STOP Single message where a master writes data to a slave. Single message where a master reads data from a slave. Combined messages, where a master issues at least two reads or writes to one or more slaves. In a combined message, each read or write begins with a START and the slave address. After the first START in a combined message these are also called repeated START bits. Repeated START bits are not preceded by STOP bits, which is how slaves know that the next transfer is part of the same message. Any given slave will only respond to certain messages, as specified in its product documentation. Pure IC systems support arbitrary message structures. SMBus is restricted to nine of those structures, such as read word N and write word N, involving a single slave. PMBus extends SMBus with a Group protocol, allowing multiple such SMBus transactions to be sent in one combined message. The terminating STOP indicates when those grouped actions should take effect. For example, one PMBus operation might reconfigure three power supplies using three different IC slave addresses, and their new configurations would take effect at the same time when they receive that STOP. With only a few exceptions, neither IC nor SMBus define message semantics, such as the meaning of data bytes in messages. Message semantics are otherwise product specific. Those exceptions include messages addressed to the IC general call address 0x.