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check return code

This commit is contained in:
King Kévin 2017-02-09 10:55:38 +01:00
parent bbce44cb8f
commit ba982e17c7
1 changed files with 3 additions and 1 deletions
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lib/rtc_ds1307.c
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@ -146,7 +146,9 @@ uint8_t* rtc_ds1307_read_time(void)
static uint8_t time[7] = {0}; // store time {seconds, minutes, hours, day, date, month, year}
uint8_t data[7] = {0}; // to read data over I2C
const uint8_t address[] = {0x00}; // memory address for data
i2c_read(RTC_DS1307_I2C_ADDR, address, LENGTH(address), data, LENGTH(data)); // read all time bytes
if (!i2c_read(RTC_DS1307_I2C_ADDR, address, LENGTH(address), data, LENGTH(data))) { // read all time bytes
return NULL;
}
time[0] = ((data[0]&0x70)>>4)*10+(data[0]&0x0f); // convert seconds from BCD
time[1] = (data[1]>>4)*10+(data[1]&0x0f); // convert minutes from BCD
time[2] = 0; // re-initialize hours