LPC54608 I2C communication problem

prathap_ponnuch — Sat, 13 Jun 2020 14:05:59 GMT

Hi All,

I am using NXP OM13902 EVB board.In this I am facing an I2C communication issue.

I2C ref code: (LPC54608 board SDK/I2C_interrupt_b2b_transfer_master)

I2C_MASTER_SLAVE_ADDR_7BIT = 0xA0U ------ I done only this address changes.

While start master transmission interrupt not able to generated.

code hang in following steps:

/* Wait for transfer completed. */
while (!g_MasterCompletionFlag)
{
}
g_MasterCompletionFlag = false;

OM13902 I2C Configuration:

SCL ------ Flexcomm 8-------pin PIO1_18

SDA-------FLexcomm 8------pin PIO1_17

slave EEPROM(24C16)

operating volt:2.7 to 5.5V

As per OM13902 schematic i connected OM13092 board and eeprom as follows:

OM13902:

Connector: J9 --------- PIN 2 ------------- to -------------- EEPROM SCL

Connector: J9 --------- PIN 4 ------------- to -------------- EEPROM SDA

Connector:J14----------PIN12 ------------- to -------------- EEPROM VDD

Connector:J14----------PIN11 ------------- to -------------- EEPROM GND

I2C pullup value: 4.7K(Both SDA and SCL) line.

Thanks in advance.

Regards,

prathap

Re: LPC54608 I2C communication problem

FelipeGarcia — Thu, 18 Jun 2020 22:32:14 GMT

Hello Prathap,

Could you please share with me what is the status you see in the i2c_master_callback that is not letting the code to set g_MasterCompletionFlag?

If you have a snippet of the I2C signals it would be helpful to see what is going on in the transactions. Most likely the master is detecting a NACK from the device.

Best regards,

Felipe

topic Re: LPC54608 I2C communication problem in LPC Microcontrollers

LPC54608 I2C communication problem

Re: LPC54608 I2C communication problem