GD32VF103_环境配置_GPIO_外部中断 GD32VF103_定时器中断 GD32VF103_串口发送_printf_接收中断_DMA GD32VF103_DAC 我们前三节写了GPIO, EXTI, TIMER, USART, DAC的用例, 本节写 CAN 发送的用例, 为什么是发送不是接收, 还不是因为接收比较复杂, 没有调好… 用的 CAN1(PB13--CAN1_TX, PB12--CAN1_RX), 自己拿烙铁焊了 CAN电平转换芯片 TCAN1051DQ1, 带Q的车规的片子: CAN1接CAN分析仪, 500k, 终端电阻用了CAN分析仪上的120Ω, 虽然不是60Ω, 在这里问题不大.
打开NucleiStudio:
File -> New -> C/C++ Project, 选择C Managed Build选择GigaDevice RISC-V Project, 填入工程名MCU默认暂时只有GD32VF103, 然后Demo也没法选, 只有Running_LED, 不变下一步, 完成.CAN, 标准帧, 扩展帧等的基本原理和相关资料不再赘述, 网上搜去, STM32的资料或者搞汽车方面的比较多.
主要配置下CAN的通讯速率, 应该是APB1的54M时钟, 预分配(prescaler)12, 得4.5MHz, 然后 can_parameter.time_segment_1 = CAN_BT_BS1_5TQ;, can_parameter.time_segment_2 = CAN_BT_BS2_3TQ;, 所以最后通讯速率 4.5M/(5+3+1) = 0.5M = 500k, 与can_parameter.resync_jump_width = CAN_BT_SJW_1TQ;关系不大.
代码如下:
#include "gd32vf103.h" #include "systick.h" can_trasnmit_message_struct transmit_message; void can1_config(void) { can_parameter_struct can_parameter; can_filter_parameter_struct can_filter; /* initialize CAN register */ can_deinit(CAN1); /* initialize CAN */ can_parameter.time_triggered = DISABLE; can_parameter.auto_bus_off_recovery = ENABLE; can_parameter.auto_wake_up = ENABLE; can_parameter.auto_retrans = ENABLE; //no_auto_retrans can_parameter.rec_fifo_overwrite = DISABLE; can_parameter.trans_fifo_order = DISABLE; can_parameter.working_mode = CAN_NORMAL_MODE; can_parameter.resync_jump_width = CAN_BT_SJW_1TQ; can_parameter.time_segment_1 = CAN_BT_BS1_5TQ; can_parameter.time_segment_2 = CAN_BT_BS2_3TQ; /* baudrate 1Mbps */ can_parameter.prescaler = 12; //54M / 12 / (5+3+1) = 500kbps can_init(CAN1, &can_parameter); } int main(void) { rcu_periph_clock_enable(RCU_CAN1); rcu_periph_clock_enable(RCU_GPIOB); gpio_init(GPIOB, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_13); //PB13 -- CAN1_TX gpio_init(GPIOB, GPIO_MODE_IPU, GPIO_OSPEED_50MHZ, GPIO_PIN_12); //PB12 -- CAN1_RX //gpio_pin_remap_config(GPIO_CAN1_REMAP,DISABLE); //Remap can1_config(); transmit_message.tx_sfid = 0x321; //standard format frame identifier transmit_message.tx_efid = 0x00; //extended format frame identifier transmit_message.tx_ft = CAN_FT_DATA; //type of frame, data or remote transmit_message.tx_ff = CAN_FF_STANDARD; //format of frame, standard or extended format transmit_message.tx_dlen = 2; //data length transmit_message.tx_data[0] = 0x00; transmit_message.tx_data[1] = 0x00; while(1) { ++transmit_message.tx_data[1]; can_message_transmit(CAN1, &transmit_message); delay_1ms(1000); } return 0; }结果如下:
符合代码预期.
https://download.csdn.net/download/weifengdq/11951375
