CAN bus pin-out changes in BSP

amleng — Fri, 29 Nov 2013 23:22:23 GMT

Hello Community,

I have a customized board using K60F120 MCU and MQX 4.02. In my board, CAN1_TX and CAN1_RX lines are connected to PTE24 and PTE25 respectively. I modified _mqx_int _bsp_flexcan_io_init() in init_gpio.c to follow these hardware changes.

case 1:

/* Configure GPIO for FlexCAN 1 peripheral function */

//pctl = (PORT_MemMapPtr)PORTC_BASE_PTR;

//pctl->PCR[17] = (PORT_PCR_MUX(2)|PORT_PCR_DSE_MASK); /* CAN1_TX.C17 */

//pctl->PCR[16] = (PORT_PCR_MUX(2)|PORT_PCR_DSE_MASK); /* CAN1_RX.C16 */

/*fixme*/

pctl = (PORT_MemMapPtr)PORTE_BASE_PTR;

pctl->PCR[24] = (PORT_PCR_MUX(2)|PORT_PCR_DSE_MASK); /*CAN1_TX.E24*/

pctl->PCR[25] = (PORT_PCR_MUX(2)|PORT_PCR_DSE_MASK); /*CAN1_RX.E25*/

/* Enable clock gate to FlexCAN 1 module */

sim->SCGC3 |= SIM_SCGC3_FLEXCAN1_MASK;

/* Select the bus clock as CAN engine clock source */

can_reg_ptr = _bsp_get_flexcan_base_address(1);

can_reg_ptr->CTRL1 |= CAN_CTRL1_CLKSRC_MASK;

break;

Since I use CAN1 I changed case (1) only.

Unfortunately evwen after these changes, I cannot get any data from CAN bus! I noticed that in twrk60f120m these pins are connected to a 12 MHz crystal which is Alt0. I assume the above changes in the init_gpio.c should overwrites the default configuration. right? Is there any other settings I need to consider? Any suggestion?

Cheers!

Re: CAN bus pin-out changes in BSP

soledad — Tue, 20 Jan 2015 15:48:05 GMT

Hi amleng,

Have you solved your problem?

Regards

Sol

topic CAN bus pin-out changes in BSP in MQX Software Solutions

CAN bus pin-out changes in BSP

Re: CAN bus pin-out changes in BSP