C7-Serial-Communication/RTCC.c at main · Ver12/C7-Serial-Communication · GitHub

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/*  Author: Steve Gunn
 * Licence: This work is licensed under the Creative Commons Attribution License.
 *          View this license at http://creativecommons.org/about/licenses/
 */
#include "i2c.h"
#include "RTCC.h"

void init_clock(void)
{
    /* TODO: Code to initiliase interface and start clock */
	init_i2c_master();
	i2c_start();
	i2c_tx(RTCC_ADDR | I2C_WRITE);
	i2c_tx(0x00);
	i2c_tx(1<<7);
	i2c_stop();

}

void set_time(rtcc t)
{
    /* TODO: Code to set time to value in t */
	i2c_start();
	i2c_tx(RTCC_ADDR | I2C_WRITE);
	i2c_tx(0x00);
	i2c_tx(1<<7 | t.ten_seconds << 4 | t.seconds);
	i2c_tx(t.ten_minutes << 4 | t.minutes);
	i2c_tx(t.ten_hours << 4 | t.hours);
	i2c_stop();
}

rtcc get_time()
{
    /* TODO: Code to get time from RTCC and return it in an rtcc struct */
	rtcc now;
	uint8_t rtcc_mem[8];
	i2c_start();
	i2c_tx(RTCC_ADDR | I2C_WRITE);
	i2c_tx(0x00);
	i2c_start();
	i2c_tx(RTCC_ADDR | I2C_READ);
	for (int i=0; i<7; i++){
		rtcc_mem[i]=i2c_rx_ack();
	}
	rtcc_mem[7]=i2c_rx_nack();
	i2c_stop();

	now.seconds=rtcc_mem[0] & 0x0F;
	now.ten_seconds= (rtcc_mem[0] & 0x70) >> 4;

	now.ten_hours = (rtcc_mem[2] & 0x30) >> 4;
	now.day=rtcc_mem[3] & 0x07;

	now.ten_date=(rtcc_mem[4] & 0x30) >> 4;
}