SE050 always NACKS on i2c command

[badhri_radhakri]

Hi Good day, I'm using SE050 as a I2C slave to my I2C Master STM32 board. Every time when i try to initiate a Soft Reset Request, I always get a nack. 

#define SLAVE_ADDR 0x48<<1

uint8_t packet[5] = {  //for soft reset request
            0x5A,             // NAD
            0xCF,             // PCB for reset
            0x00,            // LEN is 0 no INF
            0x37,            // CRC 1
            0x7F             // CRC 2
};   

while (ret = (HAL_I2C_Master_Transmit(&hi2c1, SLAVE_ADDR, packet, sizeof(packet), 100)) != HAL_OK);
HAL_Delay(50);

/* code */

Please help me with if I'm sending the wrong values. The packet values are calculated as per the I2C specs datasheet. As for the CRC I'm using the SE050 Plug Trust's library function.

Thanks!

[Kan_Li]

Hi,

Actually I could not find any obvious wrong in the packet values, maybe you can use some logical analyzer to probe the I2C frame, and check if it meets the spec as below:

Please kindly refer to https://www.nxp.com/docs/en/user-guide/UM11225.pdf  for more details.

Hope that helps,

Have a great day,
Kan

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[badhri_radhakri]

Hi Kan_Li‌ thanks, I hooked up a logic analyzer and this is how my waveform looks like:

There is always a NACK after writing the Slave address which in this case is 0x48<<1. 

Could there be any other mistake I'm making ? :smileysad:

Thanks!

[Kan_Li]

Are you using the SE050ARD board? are the jumpers set correctly? Please refer to https://www.nxp.com/docs/en/application-note/AN12395-OM-SE050ARD_hardware_overview.pdf  for details.

Have a great day,
Kan

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[badhri_radhakri · Accepted solution]

Thank you. The problem was with the ENA pin on the board. I wasn't paying attention to it's Jumper positions. Now I'm able to make the chip respond to my commands.

Thanks!

[Exocet]

Hello,

Can you share the STM32 porting files ?

I will soon start the port and I need a reference to start with.

Many thanks

[Kan_Li]

Great to know this issue has been fixed on your side. Thanks for the update!

Have a great day,
Kan

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