[AT32F403/403A] AT32F403A CAN转USB（虚拟串口）

void can_gpio_config(void)

{

  gpio_init_type gpio_init_struct;

  crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE);

  crm_periph_clock_enable(CRM_IOMUX_PERIPH_CLOCK, TRUE);

  gpio_pin_remap_config(CAN1_GMUX_0010,TRUE);

  gpio_default_para_init(&gpio_init_struct);

  /* can tx pin */

  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;

  gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;

  gpio_init_struct.gpio_mode = GPIO_MODE_MUX;

  gpio_init_struct.gpio_pins = GPIO_PINS_9;

  gpio_init_struct.gpio_pull = GPIO_PULL_NONE;

  gpio_init(GPIOB, &gpio_init_struct);

  /* can rx pin */

  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;

  gpio_init_struct.gpio_mode = GPIO_MODE_INPUT;

  gpio_init_struct.gpio_pins = GPIO_PINS_8;

  gpio_init_struct.gpio_pull = GPIO_PULL_UP;

  gpio_init(GPIOB, &gpio_init_struct);

}

void can_configuration(void)

{    

  can_base_type can_base_struct;

  can_baudrate_type can_baudrate_struct;

  can_filter_init_type can_filter_init_struct;

  crm_periph_clock_enable(CRM_CAN1_PERIPH_CLOCK, TRUE); 

  /* can base init */

  can_default_para_init(&can_base_struct);

  can_base_struct.mode_selection = CAN_MODE_COMMUNICATE;

  can_base_struct.ttc_enable = FALSE;

  can_base_struct.aebo_enable = TRUE;

  can_base_struct.aed_enable = TRUE;

  can_base_struct.prsf_enable = FALSE;

  can_base_struct.mdrsel_selection = CAN_DISCARDING_FIRST_RECEIVED;

  can_base_struct.mmssr_selection = CAN_SENDING_BY_ID;

  can_base_init(CAN1, &can_base_struct);

  /* can baudrate, set baudrate = pclk/(baudrate_div *(3 + bts1_size + bts2_size)) */

  can_baudrate_struct.baudrate_div = 10;

  can_baudrate_struct.rsaw_size = CAN_RSAW_1TQ;

  can_baudrate_struct.bts1_size = CAN_BTS1_8TQ;

  can_baudrate_struct.bts2_size = CAN_BTS2_3TQ;

  can_baudrate_set(CAN1, &can_baudrate_struct);

  /* can filter init */

  can_filter_init_struct.filter_activate_enable = TRUE;

  can_filter_init_struct.filter_mode = CAN_FILTER_MODE_ID_MASK;

  can_filter_init_struct.filter_fifo = CAN_FILTER_FIFO0;

  can_filter_init_struct.filter_number = 0;

  can_filter_init_struct.filter_bit = CAN_FILTER_32BIT;

  can_filter_init_struct.filter_id_high = 0;

  can_filter_init_struct.filter_id_low = 0;

  can_filter_init_struct.filter_mask_high = 0;

  can_filter_init_struct.filter_mask_low = 0;

  can_filter_init(CAN1, &can_filter_init_struct);

  /* can interrupt config */

  nvic_irq_enable(CAN1_SE_IRQn, 0x00, 0x00);

  nvic_irq_enable(USBFS_L_CAN1_RX0_IRQn, 0x00, 0x00);

  can_interrupt_enable(CAN1, CAN_RF0MIEN_INT, TRUE);

  can_interrupt_enable(CAN1, CAN_ETRIEN_INT, TRUE);

  can_interrupt_enable(CAN1, CAN_EOIEN_INT, TRUE);

}

void can_transmit_data(void)

{

  uint8_t transmit_mailbox;  

  can_tx_message_type tx_message_struct;

  tx_message_struct.standard_id = 0x400;

  tx_message_struct.extended_id = 0;

  tx_message_struct.id_type = CAN_ID_STANDARD;

  tx_message_struct.frame_type = CAN_TFT_DATA;

  tx_message_struct.dlc = 8;

  tx_message_struct.data[0] = 0x11;

  tx_message_struct.data[1] = 0x22;

  tx_message_struct.data[2] = 0x33;

  tx_message_struct.data[3] = 0x44;

  tx_message_struct.data[4] = 0x55;

  tx_message_struct.data[5] = 0x66;

  tx_message_struct.data[6] = 0x77;

  tx_message_struct.data[7] = 0x88;

  transmit_mailbox = can_message_transmit(CAN1, &tx_message_struct);

  while(can_transmit_status_get(CAN1, (can_tx_mailbox_num_type)transmit_mailbox) != CAN_TX_STATUS_SUCCESSFUL);

}