I2C & DMA STM32F429

Lecordier.Guy · ‎2016-06-07

Posted on June 07, 2016 at 16:54

Dear All,

I am using CubeMx F4 V1.12.0

I want to use I2C with DMA on the STM32F429 but it is not working.

In the stm32f4xx_hal_i2c.c it is noted

(+++) Configure the priority and enable the NVIC for the transfer complete interrupt on the DMA Tx or Rx Stream

and CubeMx 4.15.0 generates the code for the 2 DMA Interrupts (rx & tx) but the I2C is not working.

But in the stm32f4xx_hal_i2c.c I2C_DMAXferCplt() at line 4938 I see these lines

/* Enable EVT and ERR interrupt */

__HAL_I2C_ENABLE_IT(hi2c, I2C_IT_EVT | I2C_IT_ERR);

So it seems that the 2 I2C Event & Error Interrupts must also be in place to finalize the transmission; Is it right?

Thanks for the clarification

Nesrine M_O · ‎2016-06-08

Posted on June 08, 2016 at 11:37

Hi lecordier.guy.001,

I suggest you to start from I2C examples under the STM32F4 cube firmware package:

STM32Cube_FW_F4_V1.12.0\Projects\STM32F429I Discovery\Examples\I2C\I2C_TwoBoards_ComDMA

This example describes how to perform I2C data buffer transmission/reception between two boards, via DMA.

-Syrine-