基于GD32F103的modbus RTU主站和从站的移植

ti

GD32F103作为从站

一、在github上看到一个很好的modbus 开源协议，包括RTU的主站和从站，之前一直关注，今年没更新，主要原因是已经稳定了。最近比较闲，就将这个协议移植到GD32F103上，硬件接口主要是RS485。

二、底层的定时器驱动函数

#include "tim3.h"
#include "Sys_Config.h"
#if MD_USD_SALVE
#include "MDS_RTU_Serial.h"
#include "MDS_RTU_Serial_1.h"
#else
#include "MDM_RTU_Serial.h"
#endif
vu32 sys_tick_100us=0;
void TIM3_Int_Init(u16 arr,u16 psc)
{
timer_parameter_struct modbus_timer_structure;
rcu_periph_clock_enable(RCU_TIMER5);
modbus_timer_structure.alignedmode=TIMER_COUNTER_EDGE;
modbus_timer_structure.clockdivision=TIMER_CKDIV_DIV1;
modbus_timer_structure.counterdirection=TIMER_COUNTER_UP;
modbus_timer_structure.period=arr;
modbus_timer_structure.prescaler=psc;
modbus_timer_structure.repetitioncounter=0;
timer_init(TIMER5,&modbus_timer_structure);
timer_interrupt_enable(TIMER5,TIMER_INT_UP);
nvic_irq_enable(TIMER5_IRQn,1,3);
timer_enable(TIMER5);
}
void TIMER5_IRQHandler(void)
{
if(timer_interrupt_flag_get(TIMER5,TIMER_INT_FLAG_UP)!=RESET)
{
timer_interrupt_flag_clear(TIMER5,TIMER_INT_FLAG_UP);
sys_tick_100us++;
#if !MD_RTU_USED_OS
#if MD_USD_SALVE
//MDSTimeHandler100US(sys_tick_100us);
MDSTimeHandler100US_1(sys_tick_100us);
#else
MDMTimeHandler100US(sys_tick_100us);
#endif
#endif
}
}

复制代码

三、底层的USART驱动

#include "usart3.h"
#include "Sys_Config.h"
#if MD_USD_SALVE
#include "MDS_RTU_Serial_1.h"
#else
#include "MDM_RTU_Serial.h"
#include "MD_RTU_SysInterface.h"
#include "MDM_RTU_Fun.h"
#endif
void RS485RWConvInit(void)
{
rcu_periph_clock_enable(RCU_GPIOA);
gpio_init(GPIOA,GPIO_MODE_OUT_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_1);
}
void init_usart3(u32 baudRate)
{
rcu_periph_clock_enable(RCU_GPIOA);
rcu_periph_clock_enable(RCU_USART1);
gpio_init(GPIOA,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_2);
gpio_init(GPIOA,GPIO_MODE_IN_FLOATING,GPIO_OSPEED_50MHZ,GPIO_PIN_3);
usart_baudrate_set(USART1,baudRate);
usart_word_length_set(USART1,USART_WL_8BIT);
usart_stop_bit_set(USART1,USART_STB_1BIT);
usart_parity_config(USART1,USART_PM_NONE);
usart_transmit_config(USART1,USART_TRANSMIT_ENABLE);
usart_receive_config(USART1,USART_RECEIVE_ENABLE);
usart_hardware_flow_cts_config(USART1,USART_CTS_DISABLE);
usart_hardware_flow_rts_config(USART1,USART_RTS_DISABLE);
usart_interrupt_enable(USART1,USART_INT_RBNE);
usart_enable(USART1);
nvic_irq_enable(USART1_IRQn,0,0);
RS485RWConvInit();
}
void usart3_send_byte(u8 byte)
{
while(usart_flag_get(USART1,USART_FLAG_TC )==RESET);
usart_data_transmit(USART1,byte);
while(usart_flag_get(USART1,USART_FLAG_TC )==RESET);
}
void usart3_send_bytes(u8 *bytes,int len)
{
int i;
for(i=0;i
{
usart3_send_byte(bytes[i]);
}
}
void usart3_send_string(char *string)
{
while(*string)
{
usart3_send_byte(*string++);
}
}
void USART1_IRQHandler(void)
{
if (usart_interrupt_flag_get(USART1, USART_INT_FLAG_RBNE) != RESET)
{
uint8_t data = usart_data_receive(USART1);
#if !MD_RTU_USED_OS
#if MD_USD_SALVE
MDSSerialRecvByte_1(data);
#else
#if MDM_USD_USART3
MDMSerialRecvByte(data);
#endif
#endif
#else
extern Modbus_RTU modbus_RTU;
MD_RTU_MsgPut((PModbusBase)(&modbus_RTU), MD_RTU_MSG_HANDLE_ARG(&modbus_RTU),(void*)(data),0);
#endif
}
}