STM32F103C8, I2C1 with EEPROM_AT24C16C, it does not work T_T!

[mrtaotao789]

Posted on March 01, 2017 at 08:34

Initial Gencode : CubeMX : V4.19

IDE : KEIL       : V5.23.0.0 

HW : EEPROM : AT24C16C

minimum board STM32F103C8T6

HSE 72MHz

i pullup SDA, SCL with R 4k7 (PB7 & PB6)

Mode speed 100kHz

// this is my code.. //

my_i2c_status[0] = HAL_I2C_IsDeviceReady( &hi2c1,(uint16_t)0xA1,(uint16_t)10,3000);

my_dat[0] = 10;

my_dat[1] = 11;

my_dat[2] = 12;

my_get[0] = 0;

my_get[1] = 0;

my_get[2] = 0;

HAL_I2C_Mem_Write( &hi2c1,(uint16_t)0x00A0, (uint16_t)0, (uint16_t)8, my_dat, 3, 3000);

HAL_I2C_Mem_Read( &hi2c1,(uint16_t)0x00A1, (uint16_t)0, (uint16_t)8, my_get, 3, 3000);

my_get[0] =0 ,

my_get[1] =0 ,

my_get[2] =0 ,

It not change

T_T!

what is mistake in my code.

thank you very much

__/|\__

[waclawek.jan]

Posted on March 01, 2017 at 11:13

What re the SDA/SCL waveforms when looking by an oscilloscope or logic analyzer?

JW

[mrtaotao789]

Posted on March 01, 2017 at 18:12

[S.Ma]

Posted on March 01, 2017 at 18:37

Try replacing

HAL_I2C_Mem_Write( &hi2c1,(uint16_t)0x00A0, (uint16_t)0, (uint16_t)8, my_dat, 3, 3000);

HAL_I2C_Mem_Read( &hi2c1,(uint16_t)0x00A1, (uint16_t)0, (uint16_t)8, my_get, 3, 3000);

by

HAL_I2C_Mem_Write( &hi2c1, 0x00A0, 0x0000, 8, my_dat, 3, 3000);

HAL_Delay(10);

HAL_I2C_Mem_Write( &hi2c1, 0x00A0, 0x0000, 2, my_dat, 0, 3000);

HAL_I2C_Mem_Read( &hi2c1, 0x00A1, 0x0000, 2, my_get, 3, 3000);

It a bit overblown, let's see if you get more than a Start/Stop

[mrtaotao789]

Posted on March 02, 2017 at 04:38

                                                 <<>> This is latest coding  <<>>

// I2C_HandleTypeDef                                      *hi2c,      DevAddress,        Trials,      Timeout

my_i2c_status = HAL_I2C_IsDeviceReady( &hi2c1,    (uint16_t)0xA1, (uint16_t)10,   3000);

//-------------------------------------------------------------------------------------------------------------------//

/** my_i2c_status = 0x01.. or  HAL_ERROR   what happen..  T_T  **/

//-------------------------------------------------------------------------------------------------------------------//

my_dat = 1;      

my_get = 0xFF;

//I2C_HandleTypeDef     *hi2c,     DevAddress,          MemAddress,    MemAddSize,     *pData,       Size,  Timeout

HAL_I2C_Mem_Write(   &hi2c1,  (uint16_t)0x00A0,   (uint16_t)0,        (uint16_t)8,           &my_dat,   1,       3000);

HAL_I2C_Mem_Read(   &hi2c1,  (uint16_t)0x00A1,   (uint16_t)0,        (uint16_t)8,           &my_get,   1,       3000);

//------------------------------------------------------------------------------------------------------------------------------------------------//

my_get = 0xFF 

what is mistake ?

Thank you very much.

[mrtaotao789]

Posted on March 02, 2017 at 05:05

my_dat = 1;

my_get = 0xFF;

//I2C_HandleTypeDef *hi2c, DevAddress, MemAddress, MemAddSize, *pData, Size, Timeout

HAL_I2C_Mem_Write( &hi2c1, (uint16_t)0x00A0, (uint16_t)0, (uint16_t)8, &my_dat, 1, 3000);

HAL_I2C_Mem_Read( &hi2c1, (uint16_t)0x00A1, (uint16_t)0, (uint16_t)8, &my_get, 1, 3000);

What is mistake..??

T T

[S.Ma]

Posted on March 02, 2017 at 10:22

The chip slave address A0 is NACK => either the slave address is wrong, or bad soldering, or SDA/SCL connection is wrong. If possible, probe the EEPROM package pins and make sure it has supply and ground ok.

[mrtaotao789]

Posted on March 02, 2017 at 11:58

I think my soldering is ok, i checked  :)

and this is datasheet of EEPROM

but now, i don not understand

what is mistake ??

T_T!

and latest, this is code :

// I2C_HandleTypeDef *hi2c, DevAddress, Trials, Timeout

//my_i2c_status = HAL_I2C_IsDeviceReady( &hi2c1, (uint16_t)0xA1, (uint16_t)10, 3000);

my_dat = 0x55;

my_get = 0x00;

//I2C_HandleTypeDef *hi2c, DevAddress, MemAddress, MemAddSize, *pData, Size, Timeout

HAL_I2C_Mem_Write( &hi2c1, (uint16_t)0x00A0, (uint16_t)0, (uint16_t)1, &my_dat, 1, 3000);

HAL_I2C_Mem_Read( &hi2c1, (uint16_t)0x00A1, (uint16_t)0, (uint16_t)1, &my_get, 2, 3000);

and this is a capture from Saleae analyzer:

in last lie of coding.. i set addr = 0xA1

but it as 0xA0 on Scope.  O_o!

i do not understand.

Thank you very much 

_/\_

[Nicolas Felipe]

Posted on March 05, 2017 at 03:47

could u please share how u used to work with the eeprom? i have not ur level of knowledge and have been struggling for like 1 week now trying to read and write from an AT24C02 , im using too an 

STM32F103C8T6,

i have tested this and many other kind of codes but nothing :S 

xBuffer[0] = 'M';

HAL_I2C_Mem_Write(&hi2c1, 0x57, 0x0007, 2, xBuffer, 1, 5);

HAL_Delay(10);

xBuffer[0] = 0x00;

HAL_I2C_Mem_Write(&hi2c1, 0x57, 0x0007, 2, xBuffer, 0, 5);

HAL_I2C_Mem_Read(&hi2c1, 0x57, 0x0007, 2, xBuffer, 1, 5);*/

HAL_Delay(2000);

[mrtaotao789]

Posted on March 04, 2017 at 06:55

Now, i can solve i2c,

Lib from HAL.. 

HAL_I2C_Mem_Read() :

Algorythm of HAL_Lib is not mathing with EEPROM, so it can not use

i coding easy functions for solve this problem and oscillope by Saleae Logic Analyzer,

i follow timing diagram of RM0008 of STM and data sheet of EEPROM

Now it work..

but HAL_I2C_Mem_Write() : it is correct, it can use

thank you every body :)

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