[问答]

MCP2515初始化问题

4183 MCP2515

问答对人有帮助，内容完整，我也想知道答案 0 您好，我正在尝试连接MCP2515到Link KIT板（兼容ARDUINO）。我使用的是LinkIt ONE（数字引脚工作在3.3v）+电平转换器（TXB0108PWR）+CAN模块，板上有MCP2515和TJA1050。我不能完全确定我的初始化是错的还是好的。每次读取寄存器值时，它会返回不同的响应。在读取之间，我不调用任何SPI命令，所以理论上寄存器值不应该改变。我尝试过使用SPI命令（0xC0）和硬件（RST管脚上的低电平）在通电后使用两种类型的复位。我都得到同样的结果。我用RPI测试了我的MCP2515，所有的工作都很好，所以IC没有被破坏。我还检查了SPI是否正确地使用了回环测试，并且它通过了。现在我将分享一些关于我的方案的信息.1)连接：我不能附加连接方案，但是有一个表：LinkIt One Level.or(TXB0108PWR)MCP25153v3 VA-5v VB+5V，nRSTGND GND GNDSCK A2(3.3v)<->B2(5v)SCK MISO A4(3)。3v)-lt;->B4(5v)-B4(5v)-SOMOSI A5(3.3v)-lt->B5(5v)-B5(5v)-B5(5v)SIPIN9(CS 9(CS)A9(CS)A9(CS)A6(3.3v)- B6(5v)-B6(5v)nCSPINPINPIN2(INT)A3(3.3v)-_A3 3.3v)-<；>->> B3(5v)-> B3 B3(5v)B3(5v)B3(5v)B3(5v)-.....digitalWrite(CS_PIN,HIGH);例如readRegister:b).ization(can_mode ANY，can_.250Kbps，can_clk 16MHz)：因为初始化没有完全确认，所以我现在不尝试接收任何帧。你有什么建议来解决这个问题吗？以上来自于百度翻译以下为原文 Hello, I'm trying to connect mcp2515 to LinkIt ONE board(compatibile with Arduino). I'm using LinkIt ONE(digital pins operates at 3.3v) + Level translator(TXB0108PWR) + CAN module with MCP2515 and TJA1050 on board. I cannot fully determinate whether my initializations goes wrong or good. Each time I read register value it returns different response. Between reads I don't call any SPI command so theoretically registers values shouldn't change. I've tried to use two types of reset after power-up using SPI command(0xC0) and hardware(low-level on RST pin). After both i get same results. I did tested my MCP2515 with RPi and everything worked fine there so IC is not broken. I've also checked whether SPI works properly with loopback test - and it passed. Now I will share some informations about my scheme. 1)Connections: I cannot attach connections scheme but, so there's table: LinkIt ONE Level translator(TXB0108PWR ) MCP2515 3v3 VA --- 5v VB +5V, nRST GND GND GND SCK A2(3.3v) <-> B2(5v) SCK MISO A4(3.3v) <-> B4(5v) SO MOSI A5(3.3v) <-> B5(5v) SI PIN9(CS) A6(3.3v) <-> B6(5v) nCS PIN2(INT) A3(3.3v) <-> B3(5v) nINT 2)My code looks like this: a)Each SPI command call: digitalWrite(CS_PIN, LOW); ..... digitalWrite(CS_PIN, HIGH); for example readRegister: byte readRegister(const byte reg_addr){ byte ret; digitalWrite(CS_PIN, LOW); SPI.transfer(MCP_READ); SPI.transfer(reg_addr); ret = SPI.transfer(0x00); digitalWrite(CS_PIN, HIGH); return ret; } b)initialization(can_mode ANY, can_speed 250Kbps, can_clk 16MHz): byte initialize( const byte can_mode, const byte can_speed, const byte can_clk){ byte result; softReset();//using SPI command if(!setCtrlRegister(CANCTRL_MODE_CONFIG)) //entering config mode by using bit modify return FAIL; if(!configRate(can_speed, can_clk)) //setting registers: MCP_CNF1, MCP_CNF2, MCP_CNF3 return result; initBuffers();//Initializig masks, filters. Clearing transmit buffers modifyRegister(MCP_CANINTE, 0x03, MCP_RX0IF \| MCP_RX1IF); if(!setIdMode(can_mode)) return FAIL; result = setCtrlRegister(MCP_NORMAL); if(!result) Serial.print("Returning to Previous Mode Failure...rn"); return result; } I don't try to receive any frames now because initialization is not fully confirmed. Do you have any suggestions how to solve that? 0
2019-6-17 16:40:22　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × qun333 该类别下有 57 个回答。邀请回答 caoguiqun 该类别下有 56 个回答。邀请回答威廉希尔官方网站发广告该类别下有 56 个回答。邀请回答 psw30 该类别下有 44 个回答。邀请回答伊丹姿子该类别下有 41 个回答。邀请回答 uwufwjrw 该类别下有 39 个回答。邀请回答 hetao1111 该类别下有 38 个回答。邀请回答 lc123617 该类别下有 35 个回答。邀请回答欧阳大大该类别下有 32 个回答。邀请回答作死不止该类别下有 31 个回答。邀请回答 asd010 该类别下有 31 个回答。邀请回答 wy8719 该类别下有 29 个回答。邀请回答 60user92 该类别下有 29 个回答。邀请回答 ju978779 该类别下有 28 个回答。邀请回答嘻嘻爱哈哈该类别下有 28 个回答。邀请回答 haikitty 该类别下有 28 个回答。邀请回答 xiuzhen122 该类别下有 27 个回答。邀请回答 pol666 该类别下有 27 个回答。邀请回答 ueywyrsdfs 该类别下有 26 个回答。邀请回答 lhly23 该类别下有 25 个回答。邀请回答举报 h1654155275.5724 相关推荐 • MCP2515协议控制器与MCU的连接是如何实现的 1660 • MCP2515是什么？MCP2515协议控制器有哪些功能呢 2630 • MCP2515收发数据过程中，不触发中断 1457 • 如何解决扩展CAN芯片MCP2515的驱动移植问题？ 1748 • MCP2515通信问题 4061 • pic16的j1939/mcp2515库文件有吗？ 1504 • 基于stm32f103c8t6的有mcp2515的can例程 13436 • MCP2515错误帧 4087 • STM32连接mcp2515和另一块STM32CAN通讯问题 10187 • MCP2515资料表存疑 3635 1个回答

答案对人有帮助，有参考价值 0 你想读哪些寄存器，你得到什么值？设备必须连接到CAN收发器，总线必须终止，否则它永远无法正常启动（或退出配置模式）。您可能需要查看SPI总线上的数据以查看出错。将RPI SPI时序与ARDUINO进行比较。你可以在两个单元之间反转SPI时钟，或者使数据在错误的边缘上改变。汤姆以上来自于百度翻译以下为原文 Which registers are you trying to read and what values are you getting? The device has to be connected to a CAN Transceiver and the bus has to be terminated or it won't ever start up properly (or exit Config mode). You may need to look at the data on the SPI bus to see what is wrong. Compare the RPi SPI timing with the Arduino. You may have the SPI Clocks inverted between the two units, or have the data changing on the wrong edge. Tom

2019-6-17 16:46:35 评论举报王晗