本人用蓝牙测试通过了三个串口模块，其中USART1需要重映射配置。USART0我暂时没有启用！
下图是USART1的使用，相关接口映射可以查找“用户指南”，代码在文末（重映射需要开启AF时钟——感谢胡灿老师！）
另外我重写了delay_1ms函数，改为了delay_1us，后续会用到。
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//参考文件// ~/Nuclei/SoC/gd32vf103/Board/gd32vf103v_eval/Include/gd32vf103v_eval.h//USART2 UART3可以直接正常使用，USART1需要重映射//由于用户手册上没找到USART0的接收端口，所以目前没有测试使用过#include #include "nuclei_sdk_hal.h"#include "gd32vf103_usart.h"#include "gd32vf103_gpio.h"#include "gd32vf103_exti.h"#include "nuclei_sdk_soc.h"#define COMn (4U)#define GD32_COM0 USART0#define GD32_COM0_CLK RCU_USART0#define GD32_COM0_TX_PIN GPIO_PIN_9#define GD32_COM0_RX_PIN GPIO_PIN_10#define GD32_COM0_GPIO_PORT GPIOA#define GD32_COM0_GPIO_CLK RCU_GPIOA#define GD32_COM1 USART1#define GD32_COM1_CLK RCU_USART1#define GD32_COM1_TX_PIN GPIO_PIN_5#define GD32_COM1_RX_PIN GPIO_PIN_6#define GD32_COM1_GPIO_PORT GPIOD#define GD32_COM1_GPIO_CLK RCU_GPIOD#define GD32_COM2 USART2#define GD32_COM2_CLK RCU_USART2#define GD32_COM2_TX_PIN GPIO_PIN_10#define GD32_COM2_RX_PIN GPIO_PIN_11#define GD32_COM2_GPIO_PORT GPIOB#define GD32_COM2_GPIO_CLK RCU_GPIOB#define GD32_COM3 UART3#define GD32_COM3_CLK RCU_UART3#define GD32_COM3_TX_PIN GPIO_PIN_10#define GD32_COM3_RX_PIN GPIO_PIN_11#define GD32_COM3_GPIO_PORT GPIOC#define GD32_COM3_GPIO_CLK RCU_GPIOC/* private variables */static rcu_periph_enum COM_CLK[COMn] = {GD32_COM0_CLK, GD32_COM1_CLK,GD32_COM2_CLK,GD32_COM3_CLK};static uint32_t COM_TX_PIN[COMn] = {GD32_COM0_TX_PIN, GD32_COM1_TX_PIN,GD32_COM2_TX_PIN,GD32_COM3_TX_PIN};static uint32_t COM_RX_PIN[COMn] = {GD32_COM0_RX_PIN, GD32_COM1_RX_PIN,GD32_COM2_RX_PIN,GD32_COM3_RX_PIN};static uint32_t COM_GPIO_PORT[COMn] = {GD32_COM0_GPIO_PORT, GD32_COM1_GPIO_PORT,GD32_COM2_GPIO_PORT,GD32_COM3_GPIO_PORT};static rcu_periph_enum COM_GPIO_CLK[COMn] = {GD32_COM0_GPIO_CLK, GD32_COM1_GPIO_CLK,GD32_COM2_GPIO_CLK,GD32_COM3_GPIO_CLK};void gd_com_init(uint32_t com);int USART_IRQHandler(uint32_t com);void delay_1us(uint32_t count);int main(void){//select IRQn_Type IRQn=USART1_IRQn; uint32_t COM=GD32_COM1; //select end//initial gd_com_init(COM); usart_interrupt_enable(COM,USART_INT_RBNE); //使能接收中断 ECLIC_Register_IRQ(IRQn,ECLIC_NON_VECTOR_INTERRUPT,ECLIC_LEVEL_TRIGGER,1,0,USART_IRQHandler(COM)); // 配置中断函数 __enable_irq(); usart_enable(COM); //initial end//transmit for (uint32_t i = 1; i <= 10; i ++) { usart_data_transmit(COM,i); while ( usart_flag_get(COM, USART_FLAG_TBE)== RESET){}; // 等待发送完成 delay_1us(1000000); } //transmit end usart_interrupt_disable(COM,USART_INT_RBNE); return 0;}void gd_com_init(uint32_t com){ uint32_t com_id = 0U; if(GD32_COM0 == com){ com_id = 0U; }else if(GD32_COM1 == com){ com_id = 1U; /* enable AF clock */ rcu_periph_clock_enable(RCU_AF); }else if(GD32_COM2 == com){ com_id = 2U; }else if(GD32_COM3 == com){ com_id = 3U; } /* enable GPIO clock */ rcu_periph_clock_enable(COM_GPIO_CLK[com_id]); /* enable USART clock */ rcu_periph_clock_enable(COM_CLK[com_id]); /* connect port to USARTx_Tx */ gpio_init(COM_GPIO_PORT[com_id], GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, COM_TX_PIN[com_id]); /* connect port to USARTx_Rx */ gpio_init(COM_GPIO_PORT[com_id], GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, COM_RX_PIN[com_id]); /* USART configure *////////////////////////////////////////////////////////////////////reconfig if(GD32_COM1 == com){ gpio_pin_remap_config(GPIO_USART1_REMAP, ENABLE); }//reconfig end////////////////////////////////////////////////////////////////// usart_deinit(com); usart_baudrate_set(com, 9600U); usart_word_length_set(com, USART_WL_8BIT); usart_parity_config(com, USART_PM_NONE); usart_stop_bit_set(com, USART_STB_1BIT); usart_hardware_flow_rts_config(com, USART_RTS_DISABLE); usart_hardware_flow_cts_config(com, USART_CTS_DISABLE); usart_receive_config(com, USART_RECEIVE_ENABLE); usart_transmit_config(com, USART_TRANSMIT_ENABLE); //usart_enable(com);}int USART_IRQHandler(uint32_t com){ if(usart_interrupt_flag_get(com, USART_INT_FLAG_RBNE) != RESET){ uint8_t serial_recv = usart_data_receive(com); printf("%d",serial_recv); } return 0;}void delay_1us(uint32_t count){ uint64_t start_mtime, delta_mtime; //uint64_t delay_ticks = (SOC_TIMER_FREQ * (uint64_t)count) / 1000; uint64_t delay_ticks = (SOC_TIMER_FREQ * (uint64_t)count)/1000000; start_mtime = SysTimer_GetLoadValue(); do { delta_mtime = SysTimer_GetLoadValue() - start_mtime; } while (delta_mtime < delay_ticks);}
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