不适用库和接口编写DS1302时钟读取和写入部分的代码
时间: 2023-06-27 12:04:44 浏览: 51
DS1302是一种实时时钟芯片,可以通过串行通信协议与微控制器进行通信。在使用DS1302之前,需要先初始化一些寄存器,例如时钟的初始时间、控制寄存器等。以下是一个简单的示例代码,演示如何使用SPI接口进行DS1302的读取和写入。
```c
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#define DS1302_PORT PORTB
#define DS1302_DDR DDRB
#define DS1302_PIN PINB
#define DS1302_CLK PB5
#define DS1302_DATA PB3
#define DS1302_RST PB4
//DS1302的控制命令
#define DS1302_CMD_SECONDS 0x80
#define DS1302_CMD_MINUTES 0x82
#define DS1302_CMD_HOUR 0x84
#define DS1302_CMD_DATE 0x86
#define DS1302_CMD_MONTH 0x88
#define DS1302_CMD_DAY 0x8A
#define DS1302_CMD_YEAR 0x8C
#define DS1302_CMD_WP 0x8E
#define DS1302_CMD_TRICKLE 0x90
#define DS1302_CMD_CLOCK 0xBE
#define DS1302_CMD_RAM 0xFE
//DS1302的时钟寄存器
typedef struct {
uint8_t second;
uint8_t minute;
uint8_t hour;
uint8_t date;
uint8_t month;
uint8_t day;
uint8_t year;
} DS1302_Time;
//DS1302的读取函数
void ds1302_read(uint8_t cmd, uint8_t *data) {
uint8_t i;
DS1302_PORT &= ~(1 << DS1302_RST);
DS1302_PORT &= ~(1 << DS1302_CLK);
DS1302_PORT |= (1 << DS1302_RST);
DS1302_PORT &= ~(1 << DS1302_RST);
DS1302_PORT |= (1 << DS1302_CLK);
DS1302_PORT &= ~(1 << DS1302_CLK);
for (i = 0; i < 8; i++) {
if (cmd & (1 << i)) {
DS1302_PORT |= (1 << DS1302_DATA);
} else {
DS1302_PORT &= ~(1 << DS1302_DATA);
}
DS1302_PORT |= (1 << DS1302_CLK);
DS1302_PORT &= ~(1 << DS1302_CLK);
}
DS1302_DDR &= ~(1 << DS1302_DATA);
for (i = 0; i < 8; i++) {
*data |= ((DS1302_PIN & (1 << DS1302_DATA)) >> DS1302_DATA) << i;
DS1302_PORT |= (1 << DS1302_CLK);
DS1302_PORT &= ~(1 << DS1302_CLK);
}
DS1302_DDR |= (1 << DS1302_DATA);
DS1302_PORT &= ~(1 << DS1302_RST);
}
//DS1302的写入函数
void ds1302_write(uint8_t cmd, uint8_t data) {
uint8_t i;
DS1302_PORT &= ~(1 << DS1302_RST);
DS1302_PORT &= ~(1 << DS1302_CLK);
DS1302_PORT |= (1 << DS1302_RST);
DS1302_PORT &= ~(1 << DS1302_RST);
for (i = 0; i < 8; i++) {
if (cmd & (1 << i)) {
DS1302_PORT |= (1 << DS1302_DATA);
} else {
DS1302_PORT &= ~(1 << DS1302_DATA);
}
DS1302_PORT |= (1 << DS1302_CLK);
DS1302_PORT &= ~(1 << DS1302_CLK);
}
for (i = 0; i < 8; i++) {
if (data & (1 << i)) {
DS1302_PORT |= (1 << DS1302_DATA);
} else {
DS1302_PORT &= ~(1 << DS1302_DATA);
}
DS1302_PORT |= (1 << DS1302_CLK);
DS1302_PORT &= ~(1 << DS1302_CLK);
}
DS1302_PORT &= ~(1 << DS1302_RST);
}
int main(void) {
DS1302_Time time;
DS1302_DDR |= (1 << DS1302_CLK) | (1 << DS1302_DATA) | (1 << DS1302_RST);
ds1302_write(DS1302_CMD_WP, 0x00); //取消写保护
ds1302_write(DS1302_CMD_CLOCK, 0x00); //关闭输出时钟
ds1302_write(DS1302_CMD_TRICKLE, 0x00); //关闭涓流充电
time.second = 0x00;
time.minute = 0x11;
time.hour = 0x12;
time.date = 0x21;
time.month = 0x10;
time.day = 0x01;
time.year = 0x21;
//设置初始时间
ds1302_write(DS1302_CMD_WP, 0x00);
ds1302_write(DS1302_CMD_SECONDS, time.second);
ds1302_write(DS1302_CMD_MINUTES, time.minute);
ds1302_write(DS1302_CMD_HOUR, time.hour);
ds1302_write(DS1302_CMD_DATE, time.date);
ds1302_write(DS1302_CMD_MONTH, time.month);
ds1302_write(DS1302_CMD_DAY, time.day);
ds1302_write(DS1302_CMD_YEAR, time.year);
while(1) {
//读取当前时间
ds1302_read(DS1302_CMD_SECONDS, &time.second);
ds1302_read(DS1302_CMD_MINUTES, &time.minute);
ds1302_read(DS1302_CMD_HOUR, &time.hour);
ds1302_read(DS1302_CMD_DATE, &time.date);
ds1302_read(DS1302_CMD_MONTH, &time.month);
ds1302_read(DS1302_CMD_DAY, &time.day);
ds1302_read(DS1302_CMD_YEAR, &time.year);
printf("Current Time: %02x:%02x:%02x %02x/%02x/%02x\n", time.hour, time.minute, time.second, time.date, time.month, time.year);
_delay_ms(1000);
}
return 0;
}
```
在上述代码中,使用了AVR的GPIO库函数来控制DS1302的端口,同时使用了_delay_ms函数来控制读写操作之间的时间间隔。DS1302的读取和写入操作分别由ds1302_read和ds1302_write函数实现,其中使用了DS1302的控制命令来指定要读取或写入的寄存器地址。在初始化时,需要先取消写保护并关闭输出时钟和涓流充电功能,然后设置初始时间。之后可以通过循环读取DS1302的时钟寄存器,从而获得当前时间信息。