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niekiranniekiran
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rtc_lcd code update
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‎Resources/Source_code/Workspace/stm32f4xx_drivers/bsp/ds1307.c‎

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#include<stdint.h>
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#include<string.h>
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#include "ds1307.h"
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static void ds1307_i2c_pin_config(void);
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static void ds1307_i2c_config(void);
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static uint8_t ds1307_read(uint8_t reg_addr);
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static void ds1307_write(uint8_t value,uint8_t reg_addr);
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static uint8_t bcd_to_binary(uint8_t value);
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static uint8_t binary_to_bcd(uint8_t value);
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I2C_Handle_t g_ds1307I2cHandle;
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//returns 1 : CH = 1 ; init failed
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//returns 0 : CH = 0 ; init success
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uint8_t ds1307_init(void)
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{
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//1. init the i2c pins
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ds1307_i2c_pin_config();
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//2. initialize the i2c peripheral
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ds1307_i2c_config();
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//3. Enable the I2C peripheral
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I2C_PeripheralControl(DS1307_I2C, ENABLE);
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//4. Make clock halt = 0;
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ds1307_write(0x00,DS1307_ADDR_SEC);
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//5. Read back clock halt bit
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uint8_t clock_state = ds1307_read(DS1307_ADDR_SEC);
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return ((clock_state >> 7 ) & 0x1);
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}
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void ds1307_set_current_time(RTC_time_t *rtc_time)
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{
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uint8_t seconds, hrs;
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seconds = binary_to_bcd(rtc_time->seconds);
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seconds &= ~( 1 << 7);
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ds1307_write(seconds, DS1307_ADDR_SEC);
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ds1307_write(binary_to_bcd(rtc_time->minutes), DS1307_ADDR_MIN);
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hrs = binary_to_bcd(rtc_time->hours);
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if(rtc_time->time_format == TIME_FORMAT_24HRS){
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hrs &= ~(1 << 6);
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}else{
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hrs |= (1 << 6);
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hrs = (rtc_time->time_format == TIME_FORMAT_12HRS_PM) ? hrs | ( 1 << 5) : hrs & ~( 1 << 5) ;
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}
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ds1307_write(hrs,DS1307_ADDR_HRS);
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}
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void ds1307_set_current_date(RTC_date_t *rtc_date)
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{
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ds1307_write(binary_to_bcd(rtc_date->date),DS1307_ADDR_DATE);
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ds1307_write(binary_to_bcd(rtc_date->month),DS1307_ADDR_MONTH);
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ds1307_write(binary_to_bcd(rtc_date->year),DS1307_ADDR_YEAR);
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ds1307_write(binary_to_bcd(rtc_date->day),DS1307_ADDR_DAY);
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}
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void ds1307_get_current_time(RTC_time_t *rtc_time)
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{
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uint8_t seconds,hrs;
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seconds = ds1307_read(DS1307_ADDR_SEC);
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seconds &= ~( 1 << 7);
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rtc_time->seconds = bcd_to_binary(seconds);
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rtc_time->minutes = bcd_to_binary(ds1307_read(DS1307_ADDR_MIN));
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hrs = ds1307_read(DS1307_ADDR_HRS);
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if(hrs & ( 1 << 6)){
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//12 hr format
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rtc_time->time_format = !((hrs & ( 1 << 5)) == 0) ;
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hrs &= ~(0x3 << 5);//Clear 6 and 5
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}else{
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//24 hr format
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rtc_time->time_format = TIME_FORMAT_24HRS;
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}
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rtc_time->hours = bcd_to_binary(hrs);
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}
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void ds1307_get_current_date(RTC_date_t *rtc_date)
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{
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rtc_date->day = bcd_to_binary(ds1307_read(DS1307_ADDR_DAY));
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rtc_date->date = bcd_to_binary(ds1307_read(DS1307_ADDR_DATE));
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rtc_date->month = bcd_to_binary(ds1307_read(DS1307_ADDR_MONTH));
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rtc_date->year = bcd_to_binary(ds1307_read(DS1307_ADDR_YEAR));
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}
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static void ds1307_i2c_pin_config(void)
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{
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GPIO_Handle_t i2c_sda,i2c_scl;
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memset(&i2c_sda,0,sizeof(i2c_sda));
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memset(&i2c_scl,0,sizeof(i2c_scl));
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/*
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* I2C1_SCL ==> PB6
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* I2C1_SDA ==> PB7
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*/
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i2c_sda.pGPIOx = DS1307_I2C_GPIO_PORT;
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i2c_sda.GPIO_PinConfig.GPIO_PinAltFunMode = 4;
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i2c_sda.GPIO_PinConfig.GPIO_PinMode = GPIO_MODE_ALTFN;
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i2c_sda.GPIO_PinConfig.GPIO_PinNumber = DS1307_I2C_SDA_PIN;
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i2c_sda.GPIO_PinConfig.GPIO_PinOPType = GPIO_OP_TYPE_OD;
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i2c_sda.GPIO_PinConfig.GPIO_PinPuPdControl = DS1307_I2C_PUPD;
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i2c_sda.GPIO_PinConfig.GPIO_PinSpeed = GPIO_SPEED_FAST;
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GPIO_Init(&i2c_sda);
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i2c_scl.pGPIOx = DS1307_I2C_GPIO_PORT;
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i2c_scl.GPIO_PinConfig.GPIO_PinAltFunMode = 4;
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i2c_scl.GPIO_PinConfig.GPIO_PinMode = GPIO_MODE_ALTFN;
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i2c_scl.GPIO_PinConfig.GPIO_PinNumber = DS1307_I2C_SCL_PIN;
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i2c_scl.GPIO_PinConfig.GPIO_PinOPType = GPIO_OP_TYPE_OD;
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i2c_scl.GPIO_PinConfig.GPIO_PinPuPdControl = DS1307_I2C_PUPD;
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i2c_scl.GPIO_PinConfig.GPIO_PinSpeed = GPIO_SPEED_FAST;
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GPIO_Init(&i2c_scl);
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}
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static void ds1307_i2c_config(void)
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{
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g_ds1307I2cHandle.pI2Cx = DS1307_I2C;
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g_ds1307I2cHandle.I2C_Config.I2C_AckControl = I2C_ACK_ENABLE;
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g_ds1307I2cHandle.I2C_Config.I2C_SCLSpeed = DS1307_I2C_SPEED;
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I2C_Init(&g_ds1307I2cHandle);
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}
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static void ds1307_write(uint8_t value,uint8_t reg_addr)
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{
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uint8_t tx[2];
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tx[0] = reg_addr;
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tx[1] = value;
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I2C_MasterSendData(&g_ds1307I2cHandle, tx, 2, DS1307_I2C_ADDRESS, 0);
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}
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static uint8_t ds1307_read(uint8_t reg_addr)
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{
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uint8_t data;
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I2C_MasterSendData(&g_ds1307I2cHandle, &reg_addr, 1, DS1307_I2C_ADDRESS, 0);
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I2C_MasterReceiveData(&g_ds1307I2cHandle, &data, 1, DS1307_I2C_ADDRESS, 0);
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return data;
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}
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static uint8_t binary_to_bcd(uint8_t value)
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{
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uint8_t m , n;
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uint8_t bcd;
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bcd = value;
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if(value >= 10)
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{
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m = value /10;
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n = value % 10;
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bcd = (m << 4) | n ;
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}
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return bcd;
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}
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static uint8_t bcd_to_binary(uint8_t value)
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{
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uint8_t m , n;
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m = (uint8_t) ((value >> 4 ) * 10);
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n = value & (uint8_t)0x0F;
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return (m+n);
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}
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‎Resources/Source_code/Workspace/stm32f4xx_drivers/bsp/ds1307.h‎

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#ifndef DS1307_H_
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#define DS1307_H_
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#include "stm32f407xx.h"
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/*Application configurable items */
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#define DS1307_I2C I2C1
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#define DS1307_I2C_GPIO_PORT GPIOB
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#define DS1307_I2C_SDA_PIN GPIO_PIN_NO_7
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#define DS1307_I2C_SCL_PIN GPIO_PIN_NO_6
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#define DS1307_I2C_SPEED I2C_SCL_SPEED_SM
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#define DS1307_I2C_PUPD GPIO_PIN_PU
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/*Register addresses */
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#define DS1307_ADDR_SEC 0x00
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#define DS1307_ADDR_MIN 0x01
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#define DS1307_ADDR_HRS 0x02
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#define DS1307_ADDR_DAY 0x03
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#define DS1307_ADDR_DATE 0x04
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#define DS1307_ADDR_MONTH 0x05
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#define DS1307_ADDR_YEAR 0x06
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#define TIME_FORMAT_12HRS_AM 0
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#define TIME_FORMAT_12HRS_PM 1
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#define TIME_FORMAT_24HRS 2
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#define DS1307_I2C_ADDRESS 0x68
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#define SUNDAY 1;
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#define MONDAY 2;
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#define TUESDAY 3;
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#define WEDNESDAY 4;
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#define THURSDAY 5;
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#define FRIDAY 6;
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#define SATURDAY 7;
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typedef struct
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{
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uint8_t date;
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uint8_t month;
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uint8_t year;
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uint8_t day;
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}RTC_date_t;
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typedef struct
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{
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uint8_t seconds;
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uint8_t minutes;
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uint8_t hours;
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uint8_t time_format;
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}RTC_time_t;
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//Function prototypes
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uint8_t ds1307_init(void);
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void ds1307_set_current_time(RTC_time_t *);
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void ds1307_get_current_time(RTC_time_t *);
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void ds1307_set_current_date(RTC_date_t *);
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void ds1307_get_current_date(RTC_date_t *);
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#endif /* DS1307_H_ */

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