Posted on June 02, 2016 at 16:54Hi antos.jiri,
You have to enable also CAN1 clock.
As mentionned in reference manual RM0090, “Dual CAN� part ( page 1069) :
''- CAN1: Master bxCAN for managing the communication between a Slave
bxCAN and the 512-byte SRAM memory.
-CAN2: Slave bxCAN, with no direct access to the SRAM memory.''
Hence when using CAN2 it's obligatory to enable the Clock of CAN1
accordingly.
-Hannibal-
Hi clive1.
I know it. I am using filter 0 for CAN1 and filter 14 for CAN2.
I successfully use CAN1. These initialization of CAN2 fails:
/* Enable GPIO clock */
//RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
__GPIOB_CLK_ENABLE();
/* Enable CAN clock */
__CAN2_CLK_ENABLE();
/* CAN1 TX GPIO pin configuration */
GPIO_InitStruct.Pin = GPIO_PIN_5;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Alternate = GPIO_AF9_CAN2;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* CAN1 RX GPIO pin configuration */
GPIO_InitStruct.Pin = GPIO_PIN_6;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* CAN configuration ********************************************************/
CanHandle2.Instance = CAN2;
/* CAN register init */
//HAL_CAN_DeInit(&CanHandle2);
/* CAN cell init */
CanHandle2.pTxMsg = &TxMessage2;
CanHandle2.pRxMsg = &RxMessage2;
CanHandle2.Init.TTCM = DISABLE;
CanHandle2.Init.ABOM = DISABLE;
CanHandle2.Init.AWUM = DISABLE;
CanHandle2.Init.NART = ENABLE; //DISABLE;
CanHandle2.Init.RFLM = DISABLE;
CanHandle2.Init.TXFP = DISABLE;
CanHandle2.Init.Mode = CAN_MODE_NORMAL;
CanHandle2.Init.SJW = CAN_SJW_1TQ;
CanHandle2.Init.BS1 = CAN_BS1_3TQ; //6TQ;
CanHandle2.Init.BS2 = CAN_BS2_2TQ; //8TQ;
CanHandle2.Init.Prescaler = 7 << Pre; // 0 ... 1 MBaud, 1 .. 500k, 2 .. 250k, 3 .. 125k
if(HAL_CAN_Init(&CanHandle2) != HAL_OK)
{
/* Initialization Error */
for(;;); // ToDo remove
/ / ********** It is ending here with timeout error and CAN2->MSR is 9
}
