LeafLabs Garden » Topic: Using the CAN interface

LeafLabs Garden » Topic: Using the CAN interface http://forums.leaflabs.com/topic.php?id=802 A place to share, learn, and grow... en-US Thu, 23 May 2013 03:54:50 +0000 http://bbpress.org/?v=1.0.2 <![CDATA[Search]]> q http://forums.leaflabs.com/search.php pvh on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=6#post-21677 Sun, 16 Dec 2012 08:46:04 +0000 pvh 21677@http://forums.leaflabs.com/ Hello All, I already found a solution on my question above. Just by using the "read" function to read received data from FIFO0. I'm sending a single CAN message from my computer via a CAN-USB adapter to the Olimex STM32. The STM32 receives the data and send it back with a different ID (0x55). The problem is not every message I send from my computer is send back by the STM32. I have to send the same message 2-3 time before the STM32 replies with ID 0x55. ****** void loop() { delay(1000); msg.ID = 0x55; mbx = canBus.send(&msg); r_msg = canBus.recv(); if (r_msg != NULL) { canBus.read(CAN_FIFO0, &msg); canBus.release(CAN_FIFO0); canBus.free(); toggleLED(); } } ****** Question: why is the STM32 only replying when I send a message multiple times, and not just replying on every message? pvh on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=6#post-21669 Sat, 15 Dec 2012 12:10:08 +0000 pvh 21669@http://forums.leaflabs.com/ Hello, Can somebody tell me how I can read the actual CAN data (like ID and data[]) from the canBus.recv() function? Based on the code below I only get a valid pointer back that tells me I recieved new data. ********* void loop() { mbx = canBus.send(&smsg); delay(1000); r_msg = canBus.recv(); if (r_msg != NULL) { toggleLED(); canBus.free(); } //canBus.end(); } ********* speakman on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=6#post-20683 Wed, 31 Oct 2012 08:19:04 +0000 speakman 20683@http://forums.leaflabs.com/ Have anyone of you tried to port this CAN additions to the current libmaple at GitHub? <a href="https://github.com/leaflabs/libmaple" rel="nofollow">https://github.com/leaflabs/libmaple</a> Anonymous on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=6#post-13719 Wed, 12 Sep 2012 09:08:16 +0000 Anonymous 13719@http://forums.leaflabs.com/ I got it working with Maple IDE. I put the Tx interrupt in the wrong place. All is good at the moment. If someone does monitor this, I will probably have some more questions before the end of my project. Check back often or set up the RSS feed. Anonymous on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=6#post-13317 Fri, 07 Sep 2012 13:29:39 +0000 Anonymous 13317@http://forums.leaflabs.com/ I am brand new to these boards. Maple and leaflabs forum. I installed the three files from x893 into the proper locations and made the reccommended changes to allow for speed changes and the interrupt modifications and I am still having some problems. My program does not loop. When I run the following code (I have been moving comments around to try new things) it will output two correct messages. It will output the message from void 1 time and the message from loop 1 time (not looping). If I put a delay anywhere before the second send, it will not send anything. I think there is a problem in the libraries or core files, but I do not know enough to get it going. Can someone help me out with this or post/link code that does work? I am using Maple IDE 0.0.12 #include <HardwareCAN.h> HardwareCAN canBus(CAN1_BASE); void setup() { canBus.map(CAN_GPIO_PB8_PB9); SerialUSB.end(); // Disable USB !!! CAN_TX_MBX mbx; CanMsg t_msg; canBus.begin(CAN_SPEED_250, CAN_MODE_NORMAL); canBus.filter(0, 0, 0); //canBus.set_pool_mode(); canBus.set_irq_mode(); // use irq mode t_msg.IDE = CAN_ID_EXT; t_msg.RTR = CAN_RTR_DATA; t_msg.ID = 0x0E55FF; t_msg.DLC = 8; t_msg.Data[0] = 0xAA; t_msg.Data[1] = 0x55; t_msg.Data[2] = 0x0; t_msg.Data[3] = 0x0; t_msg.Data[4] = 0x0; t_msg.Data[5] = 0x0; t_msg.Data[6] = 0x0; t_msg.Data[7] = 0x98; mbx = canBus.send(&t_msg); // while(!canBus.fifo_ready(CAN_FIFO0)) // { // delay(10); // } // canBus.read(CAN_FIFO0, &t_msg); // canBus.release(CAN_FIFO0); // while(!canBus.available()) // { // delay(10); // } } void loop() { CAN_TX_MBX mbx; CanMsg t_msg; t_msg.Data[0] = 0xAA; t_msg.Data[1] = 0x55; t_msg.Data[2] = 0x09; t_msg.Data[3] = 0x08; t_msg.Data[4] = 0x07; t_msg.Data[5] = 0x06; t_msg.Data[6] = 0x05; t_msg.Data[7] = 0x98; mbx = canBus.send(&t_msg); // delay(100); } x893 on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=6#post-12427 Tue, 14 Aug 2012 20:20:26 +0000 x893 12427@http://forums.leaflabs.com/ Better if implement in Maple 0.13 (or 0.14 if 0.13 skipped) pvh on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=6#post-12424 Tue, 14 Aug 2012 16:09:36 +0000 pvh 12424@http://forums.leaflabs.com/ Phono, X893, the example worked for me after implementing the changes/fixes mentioned earlier in this topic. Sending/receiving between CAN monitoring device <-> Olimex-STM32 works like is should be. Thanks. PS. maybe its useful to write some documentation about the use of this library in combination with Maple and publish an up-to-date example? Phono on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=6#post-12408 Tue, 14 Aug 2012 07:57:33 +0000 Phono 12408@http://forums.leaflabs.com/ @pvh : to make it cyclic, put the send command in the <code>loop()</code> function. But first, remove the <code>canBus.end();</code> from the <code>setup()</code> function. I suggest to use the following function to safely send without overflowing the buffer : <pre><code>CAN_TX_MBX CANsend(CanMsg *pmsg) { CAN_TX_MBX mbx; do mbx = canBus.send(pmsg) ; while(mbx == CAN_TX_NO_MBX) ; return mbx ; }</code></pre> then you can write the loop() function : <pre><code>void loop(void) { CANsend(&message); delay(100); }</code></pre> I hope this will help you. x893 on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=5#post-12384 Mon, 13 Aug 2012 15:45:09 +0000 x893 12384@http://forums.leaflabs.com/ i use DIY j-link pro only. Also i have ulink and coocox but i prefer j-link. Keil as IDE (but for edit complex project better Visual Studio). pvh on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=5#post-12383 Mon, 13 Aug 2012 15:08:18 +0000 pvh 12383@http://forums.leaflabs.com/ Hello, @ Phone: I did a quick check; the fixes worked out for me as well. Message data 0xAA, 0x55 showed up in my CAN monitoring GUI. The only message was only send once, is it also possible to send it cyclic? @ X893: you are right, it is quit hard to debug Maple code/libraries without debugger or print output. Which development environment do you recommend in combination with a ARM-USB-TINY-H debugger? Phono on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=5#post-12375 Mon, 13 Aug 2012 10:49:08 +0000 Phono 12375@http://forums.leaflabs.com/ Hi X893, Hi all, I finally could have the CAN work on my Olimexino board. There were a few bugs in the library I had to fix. Please x893 note the following changes and if you can, amend the code on your repository. 1) In USB.C, anywhere, add : <pre><code>// Begin Fix JMD void USB_HP_CAN_TX_IRQHandler (void); void __irq_usb_hp_can_tx(void) { USB_HP_CAN_TX_IRQHandler () ; } // End Fix JMD</code></pre> This is the interrupt handler for the CAN TX interrupt, which was missing. Please note that this change produces errors in sketches that do not use the CAN library. X893, could you devise a way to correct this? For example using #ifdef...#endif blocks ? 2) in HardwareCAN.cpp change method HardwareCAN::begin as follows : <pre><code>CAN_STATUS HardwareCAN::begin(CAN_SPEED speed, uint32 mode) { /* Begin Fix JMD if (can_init(Port, CAN_MCR_NART, CAN_SPEED_250) == CAN_OK) */ if (can_init(Port, CAN_MCR_NART, speed) == CAN_OK) // End Fix JMD return can_set_mode(Port, mode); return can_status(); }</code></pre> This allows to choose the bit rate, that was fixed to 250k. x893 on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=5#post-12321 Sat, 11 Aug 2012 18:05:19 +0000 x893 12321@http://forums.leaflabs.com/ Hi pvh, easy way - connect 2 olimex boards (change program on first to send data and second only receive and display), so you remove invalid timing. Also you can change timing constants - after experiments with car ECU at 500kbits i change timing constants to next values [CAN_SPEED_500] = { .btr = ( (( 3-1) << CAN_BTR_SJW_POS) | ((12-1) << CAN_BTR_TS1_POS) | (( 5-1) << CAN_BTR_TS2_POS) | (CAN_CLOCK / 500000UL - 1) )}, can you print first 5 canBus.send(...) results ? all .send return correct mailbox number (0-2) ? pvh on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=5#post-12319 Sat, 11 Aug 2012 12:46:38 +0000 pvh 12319@http://forums.leaflabs.com/ Thanks X893, I successfully compiled and transferred the example (bxCAN) to the Olimex STM32 with Maple. I have used the example in your package to start with, but until now I do not have any results sending/receiving CAN messages from the Olimex STM32. I have changed the mode to "CAN_MODE_NORMAL", but also no results. The Olimex STM CAN interface is connected to a CANbus monitor device (2x 120 resistors, 2 meter cable in between). Does anyone has an idea what’s going wrong? x893 on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=5#post-12301 Sat, 11 Aug 2012 04:01:38 +0000 x893 12301@http://forums.leaflabs.com/ <a href="http://akb77.com/g/stm32/maplehardwarecan/" rel="nofollow">http://akb77.com/g/stm32/maplehardwarecan/</a> pvh on "Using the CAN interface" http://forums.leaflabs.com/topic.php?id=802&page=5#post-12286 Fri, 10 Aug 2012 14:27:50 +0000 pvh 12286@http://forums.leaflabs.com/ X893, where can we find your latest hardwareCAN library for MAPLE IDE. After compiling your “bxCAN” example I get the following error: ************ C:\Users\PvH\Downloads\maple-ide-0.0.12-windowsxp32\maple-ide-0.0.12-windowsxp32\libraries\HardwareCAN\utility\can.c: In function 'can_deinit': C:\Users\PvH\Downloads\maple-ide-0.0.12-windowsxp32\maple-ide-0.0.12-windowsxp32\libraries\HardwareCAN\utility\can.c:141: error: 'RCC_CAN' undeclared (first use in this function) C:\Users\PvH\Downloads\maple-ide-0.0.12-windowsxp32\maple-ide-0.0.12-windowsxp32\libraries\HardwareCAN\utility\can.c:141: error: (Each undeclared identifier is reported only once C:\Users\PvH\Downloads\maple-ide-0.0.12-windowsxp32\maple-ide-0.0.12-windowsxp32\libraries\HardwareCAN\utility\can.c:141: error: for each function it appears in.) C:\Users\PvH\Downloads\maple-ide-0.0.12-windowsxp32\maple-ide-0.0.12-windowsxp32\libraries\HardwareCAN\utility\can.c: In function 'can_init': ************ Thanks!