STM32 Slave and Multimaster mode

[clavaill]

Hello,

i would like to use stm32 in slave mode or/and multimaster (configure i2c_sr) with interrupt. Is it possible and how to do it.

Best regards

[uros.cvetinovic]

Hi,

Can you please be more specified?

Please explain in details what you are trying to achieve.

Best regards,

Uros

[clavaill]

I have a system that work with st7 and stm8 on I2C multimaster.
I have to make a bridge between this I2c and RS232 (and some more functions).
On this I2c, i use the broadcast id and, my first problem are to manage hardware registers for setting up the i2c and handle interrupt.
I have find how to configure systick and its interrupt, that work (it's for a pseudo real time). Now, I have to configure I2C and Rs232 and i would like some help.
I test the code on mini-m4, nucleo F0 (stm32f042k6), nucleo F1 (stm32f103rb) and discovery F4 (stm32f426zi).

Best regards

[uros.cvetinovic]

Hi,

If I understand you right, what you need is some kind of translation from I2C to UART communication?

Please correct me if I am wrong.

Best regards,

Uros

[clavaill]

Hi,

it is right. To do that i would like some help to configure the hardware i have find that :

_GPIO_MODULE_I2C1_PB67.pins
_GPIO_MODULE_I2C1_PB67.configs
_GPIO_MODULE_I2C1_PB67.gpio_remap
I2Cn_Init_Advanced(_I2C_BITRATE_STANDARD_MODE,@_GPIO_MODULE_I2C1_PB67);

but i don't how to use it and i don't know which value i have to set for hardware registers I2C_CR1, I2C_OAR1 ... Have you an example ?

Best Regards
Christian

[uros.cvetinovic]

Hi Christian,

I believe that you would need some module that would manage that translation.

Unfortunately, we don't have that kind of module on click board.

Also, I believe we don't have any example for any module like that.

Best regards,

Uros

[clavaill]

Hi,
I have set up master mode in I2C that work. (I have a nucleo f0 connected to an aardwark control center). DM00031936.pdf is the datasheet for stm32f042k6
I have try to set slave mode by
procedure I2C_Config_Slave;
begin
I2C1_Init_Advanced(I2C_SPEEDCLOCK,@_GPIO_MODULE_I2C1_PB67);
// Page 662 DM00031936.pdf
I2C1_CR1.B1 := 0; //TX Interrupt enable
I2C1_CR1.B2 := 0; //RX Interrupt enable
I2C1_CR1.B3 := 1; //Address match Interrupt enable (slave only)
I2C1_CR1.B4 := 0; //Not acknowledge received Interrupt enable
I2C1_CR1.B5 := 0; //STOP detection Interrupt enable
I2C1_CR1.B6 := 0; //Transfer Complete interrupt enable
I2C1_CR1.B7 := 0; //Error interrupts enable
I2C1_CR1.B16 := 1; //Slave byte control
I2C1_CR1.B19 := 1; //General call enable
// Page 668 DM00031936.pdf
I2C1_OAR1 := I2C1_OAR1 or I2C_ADDRESS *2;
I2C1_OAR1.B15 := 1; //Own Address 1 enable
end;

procedure It_I2C(); iv IVT_INT_I2C1; ics ICS_AUTO;
var
recepi2c : string[2];
begin
STAT_LED := not STAT_LED;
//I2C1_Read(I2C_ADDRESS,@recepi2c,2,END_MODE_STOP);
STAT_LED := not STAT_LED;
end;

When i look at the two registers in debug mode, the registers seem to be fine configured. Now the problem is the interrupt for i2c. Help please.

I have configure interrupt for Systick and that work. Why does the interrupt for I2C dont work.

Christian

[uros.cvetinovic]

Hi,

Can you please describe in details what you are trying to achieve?

Did you enable interrupt?

Best regards,

Uros