STM32和gps时间同步
时间: 2023-12-06 15:04:06 浏览: 40
要实现STM32和GPS时间同步,可以通过以下步骤实现:
1. 首先,需要在STM32中配置一个定时器,用于计算时间。可以选择使用定时器的输入捕获功能,以获取GPS模块发送的时间戳。
2. 接下来,需要设置STM32的UART串口,以便能够接收GPS模块发送的数据。可以使用STM32的DMA功能,以减轻处理器的负担。
3. 当接收到GPS模块发送的时间戳时,可以将其与STM32的定时器值进行比较,以计算出时间差。
4. 在计算出时间差之后,可以根据需要对STM32的时钟进行调整,以与GPS模块的时间保持同步。
需要注意的是,GPS模块发送的时间戳可能存在延迟和误差,因此需要对数据进行处理,以提高同步的精度。
相关问题
STM32和gps时间同步代码
以下是一个简单的示例代码,可以将STM32与GPS接收器的时间进行同步。假设您已经成功连接了GPS模块,可以从其输出中读取时间信息。
```c
#include "stm32f4xx.h"
#include "gps.h" // GPS模块的头文件
RTC_TimeTypeDef RTC_TimeStruct;
RTC_DateTypeDef RTC_DateStruct;
GPS_TimeTypeDef GPS_TimeStruct;
void RTC_Config(void)
{
RTC_InitTypeDef RTC_InitStruct;
RTC_TimeTypeDef RTC_TimeStruct;
RTC_DateTypeDef RTC_DateStruct;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
PWR_BackupAccessCmd(ENABLE);
RCC_LSEConfig(RCC_LSE_ON);
while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
RCC_RTCCLKCmd(ENABLE);
RTC_InitStruct.RTC_HourFormat = RTC_HourFormat_24;
RTC_InitStruct.RTC_AsynchPrediv = 0x7F;
RTC_InitStruct.RTC_SynchPrediv = 0xFF;
RTC_Init(&RTC_InitStruct);
RTC_DateStruct.RTC_Year = 0x21;
RTC_DateStruct.RTC_Month = 0x01;
RTC_DateStruct.RTC_Date = 0x01;
RTC_DateStruct.RTC_WeekDay = RTC_Weekday_Friday;
RTC_SetDate(RTC_Format_BIN, &RTC_DateStruct);
RTC_TimeStruct.RTC_Hours = 0x00;
RTC_TimeStruct.RTC_Minutes = 0x00;
RTC_TimeStruct.RTC_Seconds = 0x00;
RTC_SetTime(RTC_Format_BIN, &RTC_TimeStruct);
}
void GPS_GetTime(GPS_TimeTypeDef *GPS_TimeStruct)
{
// 从GPS模块中读取时间信息
}
void RTC_SetTime(GPS_TimeTypeDef *GPS_TimeStruct)
{
RTC_TimeTypeDef RTC_TimeStruct;
RTC_DateTypeDef RTC_DateStruct;
RTC_GetTime(RTC_Format_BIN, &RTC_TimeStruct);
RTC_GetDate(RTC_Format_BIN, &RTC_DateStruct);
RTC_TimeStruct.RTC_Hours = GPS_TimeStruct->hour;
RTC_TimeStruct.RTC_Minutes = GPS_TimeStruct->minute;
RTC_TimeStruct.RTC_Seconds = GPS_TimeStruct->second;
RTC_SetTime(RTC_Format_BIN, &RTC_TimeStruct);
// 如果需要,可以将GPS日期信息写入RTC的日期寄存器中
}
int main(void)
{
RTC_Config();
while(1)
{
GPS_GetTime(&GPS_TimeStruct);
RTC_SetTime(&GPS_TimeStruct);
}
}
```
上述代码中,`RTC_Config()`函数用于初始化STM32的RTC模块,`GPS_GetTime()`函数用于从GPS模块中读取时间信息,`RTC_SetTime()`函数用于将GPS时间信息写入STM32的RTC模块中。在主循环中,不断调用`GPS_GetTime()`和`RTC_SetTime()`函数,以确保RTC与GPS时间保持同步。请根据实际情况进行调整和修改。
STM32和gps时间同步pps检查代码
以下是基于STM32和GPS模块实现时间同步和PPS检测的示例代码:
首先,需要配置STM32的UART和外部中断来接收GPS模块的NMEA协议数据和PPS信号。
```c
#include "stm32f4xx.h"
#include "stdio.h"
/* GPS串口定义 */
#define GPS_USART USART1
#define GPS_USART_CLK RCC_APB2Periph_USART1
#define GPS_USART_CLK_INIT RCC_APB2PeriphClockCmd
#define GPS_USART_IRQn USART1_IRQn
#define GPS_USART_IRQHandler USART1_IRQHandler
#define GPS_USART_BAUDRATE 9600
/* GPS定位信息结构体定义 */
typedef struct {
float latitude; // 纬度
float longitude; // 经度
float altitude; // 海拔高度
float speed; // 速度
float course; // 航向
int date; // 日期(YYYYMMDD)
int time; // 时间(HHMMSS.SSS)
} gps_info_t;
/* GPS定位信息变量定义 */
gps_info_t gps_info = {0};
/* PPS信号检测变量定义 */
volatile uint32_t pps_count = 0;
volatile uint32_t last_pps_time = 0;
volatile uint8_t is_pps_detected = 0;
/* GPS定位信息解析函数 */
void gps_parse(char *str)
{
float lat_degree, lat_minute, lon_degree, lon_minute;
char lat_direction, lon_direction;
int year, month, day, hour, minute, second;
if (sscanf(str, "$GPGGA,%*f,%2d%2d.%*f,%c,%3d%2d.%*f,%c,%*d,%*d,%.1f,%*f,M,%.1f,M,,",
&year, &month, &lat_degree, &lat_minute, &lat_direction, &gps_info.altitude, &gps_info.latitude) == 7) {
// 解析纬度
gps_info.latitude = (float)lat_degree + lat_minute / 60.0;
if (lat_direction == 'S') {
gps_info.latitude = -gps_info.latitude;
}
if (sscanf(str, "$GPRMC,%2d%2d%2d.%*f,A,%3d%2d.%*f,%c,%4d%2d%2d,,,%*s*%*s",
&hour, &minute, &second, &lon_degree, &lon_minute, &lon_direction, &year, &month, &day) == 9) {
// 解析经度
gps_info.longitude = (float)lon_degree + lon_minute / 60.0;
if (lon_direction == 'W') {
gps_info.longitude = -gps_info.longitude;
}
// 解析时间
gps_info.time = hour * 10000 + minute * 100 + second;
// 解析日期
gps_info.date = year * 10000 + month * 100 + day;
}
}
}
/* GPS串口接收中断处理函数 */
void GPS_USART_IRQHandler(void)
{
if (USART_GetITStatus(GPS_USART, USART_IT_RXNE) != RESET) {
static char gps_buffer[128] = {0};
static uint8_t gps_index = 0;
char ch = USART_ReceiveData(GPS_USART) & 0xff;
if (ch == '$') {
gps_index = 0;
memset(gps_buffer, 0, sizeof(gps_buffer));
}
gps_buffer[gps_index++] = ch;
if (ch == '\n') {
gps_parse(gps_buffer);
}
USART_ClearITPendingBit(GPS_USART, USART_IT_RXNE);
}
}
/* PPS信号检测外部中断处理函数 */
void EXTI0_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line0) != RESET) {
uint32_t current_time = TIM_GetCounter(TIM2);
if (current_time - last_pps_time > 1000) {
pps_count++;
is_pps_detected = 1;
}
last_pps_time = current_time;
EXTI_ClearITPendingBit(EXTI_Line0);
}
}
/* 定时器2初始化函数 */
void TIM2_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 0xFFFFFFFF;
TIM_TimeBaseStructure.TIM_Prescaler = 84 - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2, ENABLE);
}
/* 外部中断初始化函数 */
void EXTI_Init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
int main(void)
{
USART_InitTypeDef USART_InitStructure;
/* GPS串口初始化 */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(GPS_USART_CLK, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = GPS_USART_BAUDRATE;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(GPS_USART, &USART_InitStructure);
USART_ITConfig(GPS_USART, USART_IT_RXNE, ENABLE);
USART_Cmd(GPS_USART, ENABLE);
/* PPS检测定时器和外部中断初始化 */
TIM2_Init();
EXTI_Init();
while (1) {
if (is_pps_detected) {
is_pps_detected = 0;
// 在这里添加PPS信号检测后的处理代码
}
// 在这里添加GPS定位信息处理代码
}
}
```
在主函数中,通过解析GPS模块发送的NMEA协议数据,可以获取到GPS定位信息。同时,使用定时器和外部中断来检测PPS信号,计算出两个PPS信号之间的时间差,从而实现时间同步。
需要注意的是,PPS信号的检测精度和稳定性对于时间同步的准确性有很大的影响,因此需要根据实际需求进行优化和调整。