Network and CANBUS on TWR-KV58F220

[a8Chcx]

Hi,

I am testing the network and CANBUS on TWR-KV58F220 and have the following questions:

1) When I try the httpsrv demo and it does not work. I checked pin_mux, and looks like it is configured for MII0, not RMII0. I am using PE26 as reference input as well. Do you have any sample to work with this kind of configuration? or what do I need to change on existing project?

2) When I am testing on CANBUS, I am using 50 MHz as clock, so, I can't get the exact 48MHz or 60 MHz clock, only 59.375MHz. Do you have any CANBUS timing setting for this or I can just use the settings for 60MHz.?

Thanks,

Christie

[a8Chcx]

Hi,

Here are more information:

1) I am using the same network chip as FRDM-K66. Which initialization routine should I call?

2) I am testing CANBUS based on FRDM-K64F with 250 KBPS. I running at 120MHz. The flexcan is using 60MHz. I set  seg=6, seg1=7, seg2=7,predivder=8, width=3. This works fine with my controller.

When I testing KV58F, I can see it runs at 150MHz, flexcan=75MHz, seg=1, seg1=3, seg2=2,predivder=29, width=1.

These settings are right? why there are the big different between two? How to set these for 75MHz, 118.75MHz?

Thanks,

Christie

[xiangjun_rong]

Hi, Christie,

I think the "lwip_httpsrv" project uses RMII mode instead of MII mode, for confirmation, you can check the bit 8 of the ENET_RCR in debugger, if it is 1, RMII mode is selected,if it is 0, MII mode is selected.

I have checked the code, it uses RMII mode in default.

Pls check the code:

void ENET_GetDefaultConfig(enet_config_t *config)
{
    /* Checks input parameter. */
    assert(config);

    /* Initializes the MAC configure structure to zero. */
    memset(config, 0, sizeof(enet_config_t));

    /* Sets MII mode, full duplex, 100Mbps for MAC and PHY data interface. */
    config->miiMode = kENET_RmiiMode;
    config->miiSpeed = kENET_MiiSpeed100M;
    config->miiDuplex = kENET_MiiFullDuplex;

    /* Sets the maximum receive frame length. */
    config->rxMaxFrameLen = ENET_FRAME_MAX_FRAMELEN;
}

Regarding your issue that you fail to work for the httpsrv demo, I suspect that you do not configure the jumper both for the TWR-KV58 and TWR-SER boards correctly. Pls set up the jumper based on readme.txt.

Regarding the CAN module, firstly, the baud rate should match by setting the RJW/PSEG1/PSEG2/PROPSEG bits in CANx_CTRL1 register, but the sampling point should be at the same time for transmitter/receiver. Pls refer to section 54.5.8.4 Protocol timing in RM of KV5x.

Hope it can help you

BR

Xiangjun Rong

[a8Chcx]

Hi Xiangjun,

I checked it and it is set for RMII as default.

I am using PE26 as reference clock input. Could you tell me where I should set it?

For CANBUS timing, I am using 250bpks, Flexcan clock ==75MHz. It works with  seg=1, seg1=3, seg2=2,predivder=29, width=1 settings(from sample). But, based on timing calculation, there are different. I have the timing setting on FRDM-K64 above, and other CANBUS timing for MCF5282 and etc. They are following the formula for timing calculation. Looks like KV58F is different from other MCUs?

I tried the settings from FRDM-K64, it won't work. Could you tell me how to calculate the timing for KV58F running at 250kpbs(System clock=235.75MHz, and 150MHz)?

Thanks,

Christie

[xiangjun_rong]

Hi, Christie,

I have checked that the PTE26 is multiplexed with ENET_1588_CLKIN, if you do not use 1588 protocol and just want to use Ethernet protocol, the ENET_1588_CLKIN clock is not required.

Regarding the CAN quata, I have checked the project of "lwip_httpsrv", from the code, i think that the core/sys clock is 150MHz, Bus clock is 75MHz. For the CAN clock, it uses bus clock, so the CAN driving clock is 75MHz/(predivder+1)=2.5MHz, CAN baudrate is 2.5MHz/(PROPSEG + PSEG1 + PSEG2 + 4). Pls check the above three parameter PROPSEG + PSEG1 + PSEG2 in debugger.

If you suspect the bus clock frequency, pls output a clock to CLKOUT pin(PTA6) to verify the clock.

Hope it can help you

BR

Xiangjun rong

[xiangjun_rong]

Hi, Christie,

It is said that the you should use PHY clock source to drive EXTAL pin, the 50MHz PHY clock should be connected to PTA18, so on the TWR-KV58 board, you should populate the R110, remove the R109. Pls refer to schematics of the TWR-KV58.

BR

Xiangjun Rong