STM32F7 CAN exit Sleep mode

[Evan .1]

I'm making my own low level CAN driver.

I have a problem releasing the CANperipheral from sleep mode.

So there are more requirements then I found so far.

			LL_AHB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_CAN1);
			LL_AHB3_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_CAN1);
			LL_AHB3_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_CAN1);
			/* Exit from sleep mode */
			CLEAR_BIT(Instance->MCR, CAN_MCR_SLEEP);
			while ((Instance->MSR & CAN_MSR_SLAK) != 0U);

Any suggestion?

Thanks!

[TDK]

You're mixing up AHB1, APB1, and AHB3. You need to call the correct one, with the correct argument. The LL file lists the valid arguments for each call.

LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_CAN1);
LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_CAN1);
LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_CAN1);

[Evan .1]

Ok thanks. That did not solve it unfortunately.

[Evan .1]

Somehow the candriver I/O needs to be configured before the module can exit sleep mode.

I can't get the io pins configured correctly with the lowlevel driver

So what is the difference between this two:

   __HAL_RCC_GPIOA_CLK_ENABLE();

 GPIO_InitStruct.Pin = GPIO_PIN_12;

 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;

 GPIO_InitStruct.Pull = GPIO_PULLUP;

 GPIO_InitStruct.Alternate = GPIO_AF9_CAN1;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

 /* CAN1 RX GPIO pin configuration */

 GPIO_InitStruct.Pin = GPIO_PIN_11;

 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;

 GPIO_InitStruct.Pull = GPIO_PULLUP;

 GPIO_InitStruct.Alternate = GPIO_AF9_CAN1;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

and:

 __HAL_RCC_GPIOA_CLK_ENABLE();

   LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);

   LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_12, LL_GPIO_SPEED_FREQ_VERY_HIGH);

   LL_GPIO_SetPinOutputType(GPIOA, LL_GPIO_PIN_12, LL_GPIO_OUTPUT_PUSHPULL);

   LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_12, LL_GPIO_PULL_UP);

   LL_GPIO_SetAFPin_8_15(GPIOA, LL_GPIO_PIN_12, LL_GPIO_AF_9);

   LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_12, LL_GPIO_MODE_ALTERNATE);

   LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);

   LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_11, LL_GPIO_SPEED_FREQ_VERY_HIGH);

   LL_GPIO_SetPinOutputType(GPIOA, LL_GPIO_PIN_11, LL_GPIO_OUTPUT_PUSHPULL);

   LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_11, LL_GPIO_PULL_UP);

   LL_GPIO_SetAFPin_8_15(GPIOA, LL_GPIO_PIN_11, LL_GPIO_AF_9);

   LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_11, LL_GPIO_MODE_ALTERNATE);

Edit: solved.