ARM+SD2405 IIC_RTC驱动编写及IIC通讯协议

IIC通讯协议

协议简介

IIC（inter-integrated Circuit集成电路总线)总线支持设备之间的短距离通信，用于处理器和一些外围设备之间的接口，它需要两根信号线来完成信息交换，它是由数据线SDA和时钟线SCL构成的串行总线，可发送和接收数据。常见的外围设备如温湿度传感器，RTC模块、RFID等。IIC是半双工通信方式。

IIC物理层

所有接到I2C总线设备上的串行数据SDA都接到总线的SDA上，各设备的时钟线SCL接到总线的SCL上。I2C总线上的每个设备都自己一个唯一的地址，来确保不同设备之间访问的准确性。

软件IIC和硬件IIC

软件IIC：软件IIC通信指的是用单片机的两个I/O端口模拟出来的IIC，用软件控制管脚状态以模拟I2C通信波形，软件模拟寄存器的工作方式。常见的软件IIC一般是单片机，STM32等
硬件IIC：一块硬件电路，硬件I2C对应芯片上的I2C外设，有相应I2C驱动电路，其所使用的I2C管脚也是专用的，硬件（固件）I2C是直接调用内部寄存器进行配置。
硬件I2C的效率要远高于软件的，而软件I2C由于不受管脚限制，接口比较灵活。

IIC 协议层

空闲状态
因为IIC的 SCL 和SDA 都需要接上拉电阻，保证空闲状态的稳定性，所以IIC总线在空闲状态下SCL 和SDA都保持高电平。I2C总线的SDA和SCL两条信号同时处于高电平时，规定为总线的空闲状态。此时各个器件的输出级场效管均处在截止状态，即释放总线，由两条信号线各自的上拉电阻把电平拉高。
开始条件
当 SCL 处于高电平时，SDA 由高电平变成低电平时构成一个开始条件，设备的所有操作均必须由开始条件开始。
停止条件
当 SCL 处于高电平时，SDA 由低电平变成高电平时构成一个停止条件，此时 SD2405AL 的所有操作均停止，系统进入待机状态。

数据有效性
IIC信号在数据传输过程中，当SCL=1高电平时，数据线SDA必须保持稳定状态，不允许有电平跳变，只有在时钟线上的信号为低电平期间，数据线上的高电平或低电平状态才允许变化。
SCL=1时数据线SDA的任何电平变换会看做是总线的起始信号或者停止信号。
也就是在IIC传输数据的过程中，SCL时钟线会频繁的转换电平，以保证数据的传输
应答信号
每当主机向从机发送完一个字节的数据，主机总是需要等待从机给出一个应答信号，以确认从机是否成功接收到了数据
应答信号：主机SCL拉高，读取从机SDA的电平，为低电平表示产生应答
应答信号为低电平时，规定为有效应答位（ACK，简称应答位），表示接收器已经成功地接收了该字节；
应答信号为高电平时，规定为非应答位（NACK），一般表示接收器接收该字节没有成功。

每发送一个字节（8个bit）**在一个字节传输的8个时钟后的第九个时钟期间，接收器接收数据后必须回一个ACK应答信号给发送器，这样才能进行数据传输

数据传输

SDA线上的数据在SCL时钟“高”期间必须是稳定的，只有当SCL线上的时钟信号为低时，数据线上的“高”或“低”状态才可以改变。输出到SDA线上的每个字节必须是8位，数据传送时，先传送最高位（MSB），每一个被传送的字节后面都必须跟随一位应答位（即一帧共有9位）。

当一个字节按数据位从高位到低位的顺序传输完后，紧接着从设备将拉低SDA线，回传给主设备一个应答位ACK，此时才认为一个字节真正的被传输完成，如果一段时间内没有收到从机的应答信号，则自动认为从机已正确接收到数据。

IIC通信原理参考

硬件RTC 驱动编写

#ifndef _T_SD2405_H_
#define _T_SD2405_H_#include "common.h"
//时间计数器
#define SD2405_ADDR_YEAR   0x6              /*year:0-99*/
#define SD2405_ADDR_MONTH  0x5              /*month:1-12*/
#define SD2405_ADDR_DAY    0x4              /*day:1-31*/
#define SD2405_ADDR_WEEK   0x3              /*week:0-6*/
#define SD2405_ADDR_HOUR   0x2              /*hour:0-23*/
#define SD2405_ADDR_MINUTE 0x1              /*minute:0-59*/
#define SD2405_ADDR_SECOND 0x0              /*second:0-59*/
//闹钟计数器
#define SD2405_ADDR_ALARM_YEAR   0xd        /*year:0-99*/
#define SD2405_ADDR_ALARM_MONTH  0xc        /*month:1-12*/
#define SD2405_ADDR_ALARM_DAY    0xb        /*day:1-31*/
#define SD2405_ADDR_ALARM_WEEK   0xa        /*week:0-6*/
#define SD2405_ADDR_ALARM_HOUR   0x9        /*hour:0-23*/
#define SD2405_ADDR_ALARM_MINUTE 0x8        /*minute:0-59*/
#define SD2405_ADDR_ALARM_SECOND 0x7        /*second:0-59*/
//闹钟使能
#define SD2405_ADDR_ALARM_ENABLE 0xe        /*alarm enable reg*/
//RTC 控制寄存器
#define SD2405_ADDR_CTR1 0X0F               /*ctr1 reg*/
#define SD2405_ADDR_CTR2 0X10               /*ctr2 reg*/
#define SD2405_ADDR_CTR3 0X11               /*ctr3 reg*/
//时间调整
#define SD2405_ADDR_ADJ 0x12                /*timer adjustment*/
//倒计时定时器 count down
#define SD2405_ADDR_CT  0x13                /*Count down*/
//通用RAM 14-1F 12bytes
#define SD2405_ADDR_RAM 0x14                /*general ram*/typedef enum{ALARM_YEAR_DISABLE  =0         ,       /*disable*/ALARM_YEAR_ENABLE    = (0x1<<0)   ,       ALARM_MONTH_ENABLE  = (0x1<<1)   ,ALARM_DAY_ENABLE   = (0x1<<2)   ,ALARM_WEEK_ENABLE  = (0x1<<3)   ,ALARM_HOUR_ENABLE  = (0x1<<4)   ,ALARM_MINUTE_ENABLE = (0x1<<5)  ,ALARM_SECOND_ENABLE = (0x1<<6)  ,       /*enable:-*/ALARM_ALL_ENABLE    =  0b0111111       /*enable:all*/
}ENUM_ALARM_ENABLE_TYPE;typedef enum{CTRREG_INT_EN = 0,                        /*中断使能位*/CTRREG_INTAF,                          /*报警中断标志位*/CTRREG_INTDF,                            /*倒计时中断标志位*/CTRREG_INTS,                            /*中断类型*/CTRREG_FS,                              /*频率中断*/CTRREG_TDS0,CTRREG_TDS1,CTRREG_WRTC1,CTRREG_WRTC2,CTRREG_WRTC3,CTRREG_ARST,CTRREG_FOBAT,CTRREG_RTCF,CTRREG_IM,
}ENUM_CTRREG_CMD;typedef enum{          /*中断允许位*/DISABLE_ALL = 0,INTFE = (0x1<<0),  /*frequency int*/INTAE = (0x1<<1),   /*alarm int*/               INTDE = (0x1<<2),    /*count down int*/ENANLE_ALL = 0b111
}ENUM_INT_ENABLE;typedef enum{NONE_INT  = 0,   //禁止输出，高阻态AlARM_INT  = 1,   //报警中断FREQ_INT  = 2,   //频率中断CD_INT        = 3        //倒计时中断
}ENUM_INT_TYPE;typedef enum{INTDF_FLAG = 0x1,INTAF_FLAG = 0x2
}ENUM_INT_FLAG;#pragma pack(1)
typedef struct
{unsigned short year;unsigned char month;unsigned char day;unsigned char hour;unsigned char minute;unsigned char second;unsigned char week;
}SD2405_DateTypedef;
#pragma pack()void sd2405_init(void);
void sd2405_write_time(SD2405_DateTypedef* date);
void sd2405_read_time(SD2405_DateTypedef* date);void sd2405_test(void);#endif

#include "t-sd2405.h"
#include "snps-i2c.h"
#include "board-snps-i2c.h"//#define _SD2405_DBG_
/******************FUNCTION******************/
unsigned int _sd2405_read(unsigned int addr);
void _sd2405_write(unsigned int addr,unsigned char val);
void sd2405_print_curtime(void);/*******************DEFINE*******************//*
BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0
0    1    1    0    0    1    0    R/W
R:1
W:0
注意： IIC 地址支持7位
*/
#define SD2405_RTC_ADDRESS      0x32#define SD2405_IIC_ID               0#define sd2405_pr(format, args...) vsi_printf("[sd2405]: "format, ##args)
#ifdef _SD2405_DBG_
#define sd2405_dbg(format, args...) vsi_printf("[sd2405]: "format, ##args)
#else
#define sd2405_dbg(format, args...) do {} while (0)
#endif#define WRTC1_ENABLE (0x1<<7)
#define WRTC2_ENABLE (0x1<<2)
#define WRTC3_ENABLE (0x1<<7)#define ARST_ENABLE (0x1<<7)//BCD码 十进制 互转
#define UChar2BCD(chr)  ((((chr) / 10) << 4) | ((chr) % 10))
#define BCD2UChar(bcd) ((((bcd) >> 4) * 10) + ((bcd) & 0X0F))const char *Week[] = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saterday"};
void _sd2405_reg_dump(void)
{#ifdef _SD2405_DBG_unsigned char val = 0;val = _sd2405_read(SD2405_ADDR_CTR1);sd2405_dbg("CTR1[%x]: 0x%x\n",SD2405_ADDR_CTR1,val);val = _sd2405_read(SD2405_ADDR_CTR2);sd2405_dbg("CTR3[%x]: 0x%x\n",SD2405_ADDR_CTR2,val);val = _sd2405_read(SD2405_ADDR_CTR3);sd2405_dbg("CTR3[%x]: 0x%x\n",SD2405_ADDR_CTR3,val);sd2405_dbg("\n");unsigned char year,month,day,week,hour,minute,second;year = _sd2405_read(SD2405_ADDR_YEAR);month = _sd2405_read(SD2405_ADDR_MONTH);day = _sd2405_read(SD2405_ADDR_DAY);hour = _sd2405_read(SD2405_ADDR_HOUR);minute = _sd2405_read(SD2405_ADDR_MINUTE);second = _sd2405_read(SD2405_ADDR_SECOND);week = _sd2405_read(SD2405_ADDR_WEEK);sd2405_dbg("Date Hex[0x%x-0x%x]: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n ",SD2405_ADDR_YEAR,SD2405_ADDR_SECOND,year,month,day,hour,minute,second,week);
#endif}
void _sd2405_reset(void)
{unsigned char val = 0;val = _sd2405_read(SD2405_ADDR_CTR3);val = val | ARST_ENABLE;_sd2405_write(SD2405_ADDR_CTR3,val);
}/*官方文档：
WRTC1、WRTC2、WRTC3 位: 寄存器（00H~1FH）写允许位。
即 WRTC1=1、WRTC2=1、WRTC3=1 时 写允许.注意置位有先后顺序，先置 WRTC1 为 1,后置 WRTC2、WRTC3 为 1;;
当 WRTC1=0、WRTC2=0、WRTC3=0 时则写禁止，同样置位有先后顺序，先置 WRTC2、WRTC3 为 0,后置 WRTC1 为 0。
当写禁止时，除了以上三位可以写以外，从 00H 到 1FH 所有的寄存器均不可以写。写禁止并不影响读操作。
*/
void _sd2405_ctr_wr_en(bool enable)
{unsigned char val = 0;if(enable){ val = _sd2405_read(SD2405_ADDR_CTR2) | WRTC1_ENABLE;_sd2405_write(SD2405_ADDR_CTR2,val);mdelay(3);val = _sd2405_read(SD2405_ADDR_CTR1) | WRTC2_ENABLE | WRTC3_ENABLE ;_sd2405_write(SD2405_ADDR_CTR1,val);}else{val = _sd2405_read(SD2405_ADDR_CTR1);val = val & (~(WRTC2_ENABLE | WRTC3_ENABLE));_sd2405_write(SD2405_ADDR_CTR1,val);mdelay(3);val = _sd2405_read(SD2405_ADDR_CTR2);val = val & (~WRTC1_ENABLE);_sd2405_write(SD2405_ADDR_CTR2,val);}return;
}
unsigned char _sd2405_read_ctr(ENUM_CTRREG_CMD ctr_cmd)
{unsigned char val = 0;switch(ctr_cmd){case CTRREG_INT_EN://todo:val = _sd2405_read(SD2405_ADDR_CTR2);val = val & 0x7;break;case CTRREG_INTAF:case CTRREG_INTDF://todo:val = _sd2405_read(SD2405_ADDR_CTR1);val = (val>>4) & 0x3;break;case CTRREG_FS:val = _sd2405_read(SD2405_ADDR_CTR3);val = val | 0xF;break;case CTRREG_INTS:val = _sd2405_read(SD2405_ADDR_CTR2);val = (val>>4) & 0x3;break;case CTRREG_TDS0:case CTRREG_TDS1:val = _sd2405_read(SD2405_ADDR_CTR3);val = (val>>4) & 0x3;break;case CTRREG_WRTC1:case CTRREG_WRTC2:case CTRREG_WRTC3://nothing nowbreak;case CTRREG_ARST:val = _sd2405_read(SD2405_ADDR_CTR3);val = (val>>7) & 0x1;break;case CTRREG_FOBAT:val = _sd2405_read(SD2405_ADDR_CTR2);val = (val>>3) & 0x1;break;case CTRREG_RTCF:val = _sd2405_read(SD2405_ADDR_CTR1);val = val & 0x1;break;case CTRREG_IM:break;default:break;}return val;
}unsigned int _sd2405_read(unsigned int addr)
{unsigned char val = 0;snps_i2c_read(SD2405_IIC_ID, addr, &val, 1, SD2405_RTC_ADDRESS, 1);return val;
}void _sd2405_write(unsigned int addr,unsigned char val)
{unsigned char tmp = val;snps_i2c_write(SD2405_IIC_ID, addr, &tmp, 1, SD2405_RTC_ADDRESS, 1);
}SD2405_DateTypedef _sd2405_build_time(u32 year, u32 mon, u32 day,u32 hour, u32 min, u32 sec, u32 week)
{SD2405_DateTypedef rtc_time = {0};if(year>99){sd2405_pr("Warning:The year shoud be in 2000-2099\n");rtc_time.year = year%100;}else{rtc_time.year = year;}rtc_time.month = mon;rtc_time.day = day;rtc_time.hour = hour;rtc_time.minute = min;rtc_time.second = sec;rtc_time.week = week;return rtc_time;
}void _sd2405_rtc_irq_handler()
{char int_type = _sd2405_read_ctr(CTRREG_INTS);if(AlARM_INT == int_type ){//to do something}else if(FREQ_INT == int_type){//to do something}else if(CD_INT == int_type){//to do something}else{//no interrupt}return;
}
void sd2405_init(void)
{sd2405_pr(" %s\n", __func__);snps_i2c_pin_init(SD2405_IIC_ID);snps_i2c_init(SD2405_IIC_ID, 100000, 0, 0);sd2405_pr("sd2405_init down\n");//reset_sd2405_reset();//init a time structSD2405_DateTypedef load_time = _sd2405_build_time(2022, 2, 2, 2, 30, 0, 2);sd2405_write_time(&load_time);//testsd2405_print_curtime();
}
void sd2405_write_time(SD2405_DateTypedef* date)
{_sd2405_ctr_wr_en(1);_sd2405_write(SD2405_ADDR_YEAR,UChar2BCD(date->year));_sd2405_write(SD2405_ADDR_MONTH,UChar2BCD(date->month));_sd2405_write(SD2405_ADDR_DAY,UChar2BCD(date->day));_sd2405_write(SD2405_ADDR_HOUR,UChar2BCD(date->hour));_sd2405_write(SD2405_ADDR_MINUTE,UChar2BCD(date->minute));_sd2405_write(SD2405_ADDR_SECOND,UChar2BCD(date->second));_sd2405_write(SD2405_ADDR_WEEK,UChar2BCD(date->week));_sd2405_ctr_wr_en(0);return;
}
void sd2405_read_time(SD2405_DateTypedef* date)
{//SD2405_DateTypedef read_time = {0};date->year = BCD2UChar(_sd2405_read(SD2405_ADDR_YEAR));date->month = BCD2UChar(_sd2405_read(SD2405_ADDR_MONTH));date->day = BCD2UChar(_sd2405_read(SD2405_ADDR_DAY));date->hour = BCD2UChar(_sd2405_read(SD2405_ADDR_HOUR));date->minute = BCD2UChar(_sd2405_read(SD2405_ADDR_MINUTE));date->second = BCD2UChar(_sd2405_read(SD2405_ADDR_SECOND));date->week = BCD2UChar(_sd2405_read(SD2405_ADDR_WEEK));sd2405_dbg(" time: %d-%d-%d %d:%d:%d %s\n", date->year,date->month, date->day, date->hour,date->minute, date->second,Week[date->week]);return ;//read_time;
}void sd2405_print_curtime(void)
{//SD2405_DateTypedef *curr_time = (SD2405_DateTypedef *)malloc(sizeof(SD2405_DateTypedef)); //当前gcc 不支持mallocSD2405_DateTypedef curr_time = {0};sd2405_read_time(&curr_time);vsi_printf(" time: %d-%d-%d %d:%d:%d %s\n", curr_time.year,curr_time.month, curr_time.day, curr_time.hour,curr_time.minute, curr_time.second, Week[curr_time.week]);
}
/*建议只使用一种闹钟，TODO:组合闹钟*/ //测试建议用s、m、h
//void as2405_set_alarm_enable(unsigned int int_type)
void as2405_set_alarm_enable(ENUM_ALARM_ENABLE_TYPE int_type)
{unsigned char val = 0;val = _sd2405_read(SD2405_ADDR_CTR2);val = val | INTAE;_sd2405_write(SD2405_ADDR_CTR2,val);_sd2405_write(SD2405_ADDR_ALARM_ENABLE,int_type);
}
void sd2405_set_alarm(SD2405_DateTypedef* date)
{//todo : 中断控制_sd2405_ctr_wr_en(1);_sd2405_write(SD2405_ADDR_ALARM_YEAR,UChar2BCD(date->year));_sd2405_write(SD2405_ADDR_ALARM_MONTH,UChar2BCD(date->month));_sd2405_write(SD2405_ADDR_ALARM_DAY,UChar2BCD(date->day));//年月日/*_sd2405_write(SD2405_ADDR_ALARM_YEAR,_sd2405_read(SD2405_ADDR_YEAR));_sd2405_write(SD2405_ADDR_ALARM_MONTH,_sd2405_read(SD2405_ADDR_MONTH));_sd2405_write(SD2405_ADDR_ALARM_DAY,_sd2405_read(SD2405_ADDR_DAY));*/_sd2405_write(SD2405_ADDR_ALARM_HOUR,UChar2BCD(date->hour));_sd2405_write(SD2405_ADDR_ALARM_MINUTE,UChar2BCD(date->minute));_sd2405_write(SD2405_ADDR_ALARM_SECOND,UChar2BCD(date->second));_sd2405_write(SD2405_ADDR_ALARM_WEEK,UChar2BCD(date->week));_sd2405_ctr_wr_en(0);return;
}void sd2405_test(void)
{vsi_printf("Testing sd2405 iic rtc.\n");vsi_printf("TODO: interrupt function\\Alarm function \n");vsi_printf("input \n ");vsi_printf("0:init  1: get time  2: set time  3: Test\n ");u8 c = vsi_getc();if('0' == c){vsi_printf("sd2405 init...\n");sd2405_init();_sd2405_reg_dump();}else if('1' == c){vsi_printf("sd2405 print time.\n");sd2405_print_curtime();}else if('2' == c){SD2405_DateTypedef load_time = _sd2405_build_time(2055, 5, 5, 5, 30, 0, 5);sd2405_write_time(&load_time);sd2405_print_curtime();}else if('3' == c){unsigned int counter = 0;while(1){vsi_printf("[%d]: ",counter);sd2405_print_curtime();delay(60);counter++;}}else{vsi_printf("errors\n");}
}

BUG

设备地址的位数：

设备地址是7位：并且设备具有唯一地址：所以是0x32, 而不是0x64什么的。

2.日期的存储是以BCD码的形式存储的，不能以16进制或者2进制换算日期。
3.读取的字节数为1.
2. YEAR 寄存器为8个字节，并且是以BCD存储，所以最大只能是99。所以要注意时间的开始是2000年，2000要自己加上。
3. 代码是硬件IIC 电路，有特定的IIC 驱动接口可以调用，并不是软件模拟的GPIO控制。

代码更新

BUGFIX: 新增12hour 24hour 进制转换、

#include "t-sd2405.h"
#include "snps-i2c.h"
#include "board-snps-i2c.h"//#define _SD2405_DBG_
/******************FUNCTION******************/
unsigned int _sd2405_read(unsigned int addr);
void _sd2405_write(unsigned int addr,unsigned char val);
void sd2405_print_curtime(void);/*******************DEFINE*******************//*
BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0
0    1    1    0    0    1    0    R/W
R:1
W:0
注意： IIC 地址支持7位
*/
#define SD2405_RTC_ADDRESS      0x32#define SD2405_IIC_ID               0#define sd2405_pr(format, args...) vsi_printf("[sd2405]: "format, ##args)
#ifdef _SD2405_DBG_
#define sd2405_dbg(format, args...) vsi_printf("[sd2405]: "format, ##args)
#else
#define sd2405_dbg(format, args...) do {} while (0)
#endif#define WRTC1_ENABLE (0x1<<7)
#define WRTC2_ENABLE (0x1<<2)
#define WRTC3_ENABLE (0x1<<7)#define ARST_ENABLE (0x1<<7)
#define AM_PM_BIT 5
#define H24_12_BIT 7//BCD码 十进制 互转
#define UChar2BCD(chr)  ((((chr) / 10) << 4) | ((chr) % 10))
#define BCD2UChar(bcd) ((((bcd) >> 4) * 10) + ((bcd) & 0X0F))/*AM: 0 PM: 1*/
unsigned int AM_PM_flag = 0;
unsigned int hour_24_flag = 0;const char *Week[] = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saterday"};
const char *AMPM[] = {"AM","PM"};
void _sd2405_reg_dump(void)
{#ifdef _SD2405_DBG_unsigned char val = 0;val = _sd2405_read(SD2405_ADDR_CTR1);sd2405_dbg("CTR1[%x]: 0x%x\n",SD2405_ADDR_CTR1,val);val = _sd2405_read(SD2405_ADDR_CTR2);sd2405_dbg("CTR3[%x]: 0x%x\n",SD2405_ADDR_CTR2,val);val = _sd2405_read(SD2405_ADDR_CTR3);sd2405_dbg("CTR3[%x]: 0x%x\n",SD2405_ADDR_CTR3,val);sd2405_dbg("\n");unsigned char year,month,day,week,hour,minute,second;year = _sd2405_read(SD2405_ADDR_YEAR);month = _sd2405_read(SD2405_ADDR_MONTH);day = _sd2405_read(SD2405_ADDR_DAY);hour = _sd2405_read(SD2405_ADDR_HOUR);minute = _sd2405_read(SD2405_ADDR_MINUTE);second = _sd2405_read(SD2405_ADDR_SECOND);week = _sd2405_read(SD2405_ADDR_WEEK);sd2405_dbg("Date Hex[0x%x-0x%x]: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n ",SD2405_ADDR_YEAR,SD2405_ADDR_SECOND,year,month,day,hour,minute,second,week);
#endif}
void _sd2405_reset(void)
{unsigned char val = 0;val = _sd2405_read(SD2405_ADDR_CTR3);val = val | ARST_ENABLE;_sd2405_write(SD2405_ADDR_CTR3,val);
}/*官方文档：
WRTC1、WRTC2、WRTC3 位: 寄存器（00H~1FH）写允许位。
即 WRTC1=1、WRTC2=1、WRTC3=1 时 写允许.注意置位有先后顺序，先置 WRTC1 为 1,后置 WRTC2、WRTC3 为 1;;
当 WRTC1=0、WRTC2=0、WRTC3=0 时则写禁止，同样置位有先后顺序，先置 WRTC2、WRTC3 为 0,后置 WRTC1 为 0。
当写禁止时，除了以上三位可以写以外，从 00H 到 1FH 所有的寄存器均不可以写。写禁止并不影响读操作。
*/
void _sd2405_ctr_wr_en(bool enable)
{unsigned char val = 0;if(enable){ val = _sd2405_read(SD2405_ADDR_CTR2) | WRTC1_ENABLE;_sd2405_write(SD2405_ADDR_CTR2,val);mdelay(3);val = _sd2405_read(SD2405_ADDR_CTR1) | WRTC2_ENABLE | WRTC3_ENABLE ;_sd2405_write(SD2405_ADDR_CTR1,val);}else{val = _sd2405_read(SD2405_ADDR_CTR1);val = val & (~(WRTC2_ENABLE | WRTC3_ENABLE));_sd2405_write(SD2405_ADDR_CTR1,val);mdelay(3);val = _sd2405_read(SD2405_ADDR_CTR2);val = val & (~WRTC1_ENABLE);_sd2405_write(SD2405_ADDR_CTR2,val);}return;
}void _sd2405_clear_time_adj(void)
{_sd2405_write(SD2405_ADDR_ADJ,0);
}unsigned char _sd2405_read_ctr(ENUM_CTRREG_CMD ctr_cmd)
{unsigned char val = 0;switch(ctr_cmd){case CTRREG_INT_EN://todo:val = _sd2405_read(SD2405_ADDR_CTR2);val = val & 0x7;break;case CTRREG_INTAF:case CTRREG_INTDF://todo:val = _sd2405_read(SD2405_ADDR_CTR1);val = (val>>4) & 0x3;break;case CTRREG_FS:val = _sd2405_read(SD2405_ADDR_CTR3);val = val | 0xF;break;case CTRREG_INTS:val = _sd2405_read(SD2405_ADDR_CTR2);val = (val>>4) & 0x3;break;case CTRREG_TDS0:case CTRREG_TDS1:val = _sd2405_read(SD2405_ADDR_CTR3);val = (val>>4) & 0x3;break;case CTRREG_WRTC1:case CTRREG_WRTC2:case CTRREG_WRTC3://nothing nowbreak;case CTRREG_ARST:val = _sd2405_read(SD2405_ADDR_CTR3);val = (val>>7) & 0x1;break;case CTRREG_FOBAT:val = _sd2405_read(SD2405_ADDR_CTR2);val = (val>>3) & 0x1;break;case CTRREG_RTCF:val = _sd2405_read(SD2405_ADDR_CTR1);val = val & 0x1;break;case CTRREG_IM:break;default:break;}return val;
}void _sd2405_set_24h(bool en)
{if(en)hour_24_flag = 1;elsehour_24_flag = 0;
}unsigned int _sd2405_read(unsigned int addr)
{unsigned char val = 0;snps_i2c_read(SD2405_IIC_ID, addr, &val, 1, SD2405_RTC_ADDRESS, 1);//BUGFIX: 小时的最高位 12_/24 是 12 或 24 小时制选择位。 //当 12_/24=1 时,24 小时制; 当 12_/24=0 时, 12 小时制。//12 小时制时,H20 为 AM/PM 指示位,H20=0 为 AM,H20=1 为 PM,//date->hour = BCD2UChar(_sd2405_read(SD2405_ADDR_HOUR));if(SD2405_ADDR_HOUR == addr){sd2405_dbg("read addr: %x\n",val);if(val>>H24_12_BIT){val &= 0x3F;}else{if(val>>AM_PM_BIT){AM_PM_flag = 1;}else{AM_PM_flag = 0;}val &= 0x1F;}sd2405_dbg("return val: %x\n",val);}return val;
}void _sd2405_write(unsigned int addr,unsigned char bcd_char)
{unsigned char tmp = 0;//hour  特殊处理if(SD2405_ADDR_HOUR == addr){if(hour_24_flag){tmp = bcd_char | (1<<H24_12_BIT);}else{if(AM_PM_flag)tmp = bcd_char | (1<<AM_PM_BIT);elsetmp = bcd_char;}sd2405_dbg("write val: %x\n",bcd_char);}else{tmp = bcd_char;}snps_i2c_write(SD2405_IIC_ID, addr, &tmp, 1, SD2405_RTC_ADDRESS, 1);
}SD2405_DateTypedef _sd2405_build_time(u32 year, u32 mon, u32 day,u32 hour, u32 min, u32 sec, u32 week)
{SD2405_DateTypedef rtc_time = {0};if(year>99){//sd2405_pr("Warning:The year shoud be in 2000-2099\n");rtc_time.year = year%100;}else{rtc_time.year = year;}rtc_time.month = mon;rtc_time.day = day;rtc_time.hour = hour;rtc_time.minute = min;rtc_time.second = sec;rtc_time.week = week;return rtc_time;
}void _sd2405_rtc_irq_handler()
{char int_type = _sd2405_read_ctr(CTRREG_INTS);if(AlARM_INT == int_type ){//to do something}else if(FREQ_INT == int_type){//to do something}else if(CD_INT == int_type){//to do something}else{//no interrupt}return;
}
void sd2405_init(void)
{sd2405_pr(" %s\n", __func__);snps_i2c_pin_init(SD2405_IIC_ID);snps_i2c_init(SD2405_IIC_ID, 100000, 0, 0);sd2405_pr("sd2405_init down\n");//reset_sd2405_reset();_sd2405_set_24h(1);//init a time structSD2405_DateTypedef load_time = _sd2405_build_time(2022, 2, 2, 2, 30, 0, 0);sd2405_write_time(&load_time);//testsd2405_print_curtime();
}
void sd2405_write_time(SD2405_DateTypedef* date)
{_sd2405_clear_time_adj();_sd2405_ctr_wr_en(1);if(hour_24_flag){sd2405_dbg("Write: %d-%d-%d %d:%d:%d %s\n", date->year,date->month, date->day, date->hour,date->minute, date->second,Week[date->week]);}else{sd2405_dbg("Write: %d-%d-%d %d:%d:%d %s %s\n", date->year,date->month, date->day, date->hour,date->minute, date->second,AMPM[AM_PM_flag],Week[date->week]);}_sd2405_write(SD2405_ADDR_YEAR,UChar2BCD(date->year));_sd2405_write(SD2405_ADDR_MONTH,UChar2BCD(date->month));_sd2405_write(SD2405_ADDR_DAY,UChar2BCD(date->day));if( 0 == hour_24_flag ){if(date->hour >= 12){AM_PM_flag = 1;date->hour -= 12 ;}}_sd2405_write(SD2405_ADDR_HOUR,UChar2BCD(date->hour));_sd2405_write(SD2405_ADDR_MINUTE,UChar2BCD(date->minute));_sd2405_write(SD2405_ADDR_SECOND,UChar2BCD(date->second));_sd2405_write(SD2405_ADDR_WEEK,UChar2BCD(date->week));_sd2405_ctr_wr_en(0);return;}void sd2405_read_time(SD2405_DateTypedef* date)
{//SD2405_DateTypedef read_time = {0};date->year = BCD2UChar(_sd2405_read(SD2405_ADDR_YEAR));date->month = BCD2UChar(_sd2405_read(SD2405_ADDR_MONTH));date->day = BCD2UChar(_sd2405_read(SD2405_ADDR_DAY));date->hour = BCD2UChar(_sd2405_read(SD2405_ADDR_HOUR));date->minute = BCD2UChar(_sd2405_read(SD2405_ADDR_MINUTE));date->second = BCD2UChar(_sd2405_read(SD2405_ADDR_SECOND));date->week = BCD2UChar(_sd2405_read(SD2405_ADDR_WEEK));if(hour_24_flag){sd2405_dbg("Read: %d-%d-%d %d:%d:%d %s\n", date->year,date->month, date->day, date->hour,date->minute, date->second,Week[date->week]);}else{sd2405_dbg("Read: %d-%d-%d %d:%d:%d %s %s\n", date->year,date->month, date->day, date->hour,date->minute, date->second,AMPM[AM_PM_flag],Week[date->week]);}return ;//read_time;
}void sd2405_print_curtime(void)
{//SD2405_DateTypedef *curr_time = (SD2405_DateTypedef *)malloc(sizeof(SD2405_DateTypedef)); //当前gcc 不支持mallocSD2405_DateTypedef curr_time = {0};sd2405_read_time(&curr_time);if(hour_24_flag){vsi_printf("Time: %d-%d-%d %d:%d:%d %s\n", curr_time.year,curr_time.month, curr_time.day, curr_time.hour,curr_time.minute, curr_time.second, Week[curr_time.week]);}else{vsi_printf("Time: %d-%d-%d %d:%d:%d %s %s\n", curr_time.year,curr_time.month, curr_time.day, curr_time.hour,curr_time.minute, curr_time.second,AMPM[AM_PM_flag],Week[curr_time.week]);}
}
/*建议只使用一种闹钟，TODO:组合闹钟*/ //测试建议用s、m、h
//void as2405_set_alarm_enable(unsigned int int_type)
void as2405_set_alarm_enable(ENUM_ALARM_ENABLE_TYPE int_type)
{unsigned char val = 0;val = _sd2405_read(SD2405_ADDR_CTR2);val = val | INTAE;_sd2405_write(SD2405_ADDR_CTR2,val);_sd2405_write(SD2405_ADDR_ALARM_ENABLE,int_type);
}
void sd2405_set_alarm(SD2405_DateTypedef* date)
{//todo : 中断控制_sd2405_ctr_wr_en(1);_sd2405_write(SD2405_ADDR_ALARM_YEAR,UChar2BCD(date->year));_sd2405_write(SD2405_ADDR_ALARM_MONTH,UChar2BCD(date->month));_sd2405_write(SD2405_ADDR_ALARM_DAY,UChar2BCD(date->day));//年月日/*_sd2405_write(SD2405_ADDR_ALARM_YEAR,_sd2405_read(SD2405_ADDR_YEAR));_sd2405_write(SD2405_ADDR_ALARM_MONTH,_sd2405_read(SD2405_ADDR_MONTH));_sd2405_write(SD2405_ADDR_ALARM_DAY,_sd2405_read(SD2405_ADDR_DAY));*/_sd2405_write(SD2405_ADDR_ALARM_HOUR,UChar2BCD(date->hour));_sd2405_write(SD2405_ADDR_ALARM_MINUTE,UChar2BCD(date->minute));_sd2405_write(SD2405_ADDR_ALARM_SECOND,UChar2BCD(date->second));_sd2405_write(SD2405_ADDR_ALARM_WEEK,UChar2BCD(date->week));_sd2405_ctr_wr_en(0);return;
}void sd2405_test(void)
{vsi_printf("Testing sd2405 iic rtc.\n");vsi_printf("TODO: interrupt function\\Alarm function \n");vsi_printf("input \n ");vsi_printf("0:init  1: get time  2: set time  3: Test\n ");u8 c = vsi_getc();if('0' == c){vsi_printf("sd2405 init...\n");sd2405_init();_sd2405_reg_dump();}else if('1' == c){vsi_printf("sd2405 print time.\n");sd2405_print_curtime();}else if('2' == c){SD2405_DateTypedef load_time ={0};_sd2405_set_24h(1);load_time = _sd2405_build_time(2025, 5, 5, 23, 30, 0, 0);sd2405_write_time(&load_time);sd2405_print_curtime();_sd2405_set_24h(0);load_time = _sd2405_build_time(2025, 5, 5, 23, 30, 0, 0);sd2405_write_time(&load_time);sd2405_print_curtime();//warning :  12小时进制转24进制， 天数会+1_sd2405_set_24h(1);load_time = _sd2405_build_time(2025, 5, 5, 5, 30, 0, 0);sd2405_write_time(&load_time);sd2405_print_curtime();_sd2405_set_24h(1);load_time = _sd2405_build_time(2025, 5, 5, 2, 30, 0, 0);sd2405_write_time(&load_time);sd2405_print_curtime();}else if('3' == c){unsigned int counter = 0;while(1){vsi_printf("[%d]: ",counter);sd2405_print_curtime();delay(60);counter++;}}else{vsi_printf("errors\n");}
}