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Preserve SECONDS fields when clearing Clock Halt bit at initialisation (#77354) #77727

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Preserve SECONDS fields when clearing Clock Halt bit at initialisation (#77354) #77727

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18 changes: 14 additions & 4 deletions drivers/rtc/rtc_ds1307.c
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Original file line number Diff line number Diff line change
Expand Up @@ -136,13 +136,23 @@ static int ds1307_init(const struct device *dev)
/* Disable squarewave output */
err = i2c_reg_write_byte_dt(&config->i2c_bus, DS1307_REG_CTRL, 0x00);
if (err < 0) {
LOG_ERR("Error: SQW:%d\n", err);
LOG_ERR("Error: SQW: %d\n", err);
}

/* Make clock halt = 0 */
err = i2c_reg_write_byte_dt(&config->i2c_bus, DS1307_REG_SECONDS, 0x00);
/* Ensure Clock Halt = 0 */
uint8_t reg = 0;

err = i2c_reg_read_byte_dt(&config->i2c_bus, DS1307_REG_SECONDS, &reg);
if (err < 0) {
LOG_ERR("Error: Set clock halt bit:%d\n", err);
LOG_ERR("Error: Read SECONDS/Clock Halt register: %d\n", err);
}
if (reg & ~SECONDS_BITS) {
/* Clock Halt bit is set */
err = i2c_reg_write_byte_dt(&config->i2c_bus, DS1307_REG_SECONDS,
reg & SECONDS_BITS);
if (err < 0) {
LOG_ERR("Error: Clear Clock Halt bit: %d\n", err);
}
}

return 0;
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