How to set SDA line of I2C low using software

[JT.1]

I'm using LC709203F to measure RSOC. It is going to sleep mode after 1.2 Ms.

To wake up from sleep mode , I have write 0x0001 to register 0x15 in fuel gauge.

Prior to that , I have to set SDA line to low for particular time.

Please help me to set SDA line of I2C low for particular time either using HAL or register

[waclawek.jan]

Which STM32?

Just set SDA's pin GPIO_MODER field from AF to Out (from 0b10 to 0b01) and do whatever you need through its GPIO_BSRR (->ODR); when finished, change GPIO_MODER back to AF.

 #define AND &
 #define OR |
 
#define GPIO_Mode_In                        0x00 // GPIO Input Mode
#define GPIO_Mode_Out                       0x01 // GPIO Output Mode
#define GPIO_Mode_AF                        0x02 // GPIO Alternate function Mode
#define GPIO_Mode_AlternateFunction         GPIO_Mode_AF
#define GPIO_Mode_Analog                    0x03 // GPIO Analog Mode
 
   GPIOB->MODER = (GPIOB->MODER AND ~(0
     OR GPIO_MODER_MODER6
     OR GPIO_MODER_MODER7
   )) OR (0
     OR (GPIO_Mode_Out * GPIO_MODER_MODER6_0) // SCL
     OR (GPIO_Mode_Out * GPIO_MODER_MODER7_0) // SDA
   );

JW

[JT.1]

Hello JW

Thanks for your response.

I'm using STM32L452. I have attached the image which instructed by LC709203F(Fuel gauge that I'm using) for your reference.