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Rockbox mail archiveSubject: Question to powermgm.c charging algorithmQuestion to powermgm.c charging algorithm
From: Uwe Freese <mail_at_uwe-freese.de>
Date: Thu, 8 Aug 2002 12:38:51 +0200 Hello, First: What do you call negative and positive delta? It seems that positive delta = voltage is going down negative delta = voltage is going up Now a question to the code: ------snip------ if (delta < -50) { /* delta < -0.3 V */ DEBUGF("power: short-term negative delta, enough!\n"); charger_enable(false); snprintf(power_message, POWER_MESSAGE_LEN, "end negd %d %dmin", delta, charged_time); } else { /* if we didn't disable the charger in the previous test, check for low positive delta */ delta = 0; for (i = 0; i < CHARGE_END_ZEROD; i++) delta += power_history[POWER_HISTORY_LEN-1-i]*100 - power_history[POWER_HISTORY_LEN-1-i-1]*100; delta = delta / CHARGE_END_ZEROD; if (delta <= 5) { /* delta of <= 0.005 V */ DEBUGF("power: long-term small positive delta, enough!\n"); charger_enable(false); snprintf(power_message, POWER_MESSAGE_LEN, "end lowd %d %dmin", delta, charged_time); } } ------snip------ why is the second test (delta <= 5) ? Shouldn't it be (delta >= 5), that means "turn off charging if the voltage went down at least by 0.005" Volts? Does the first check (delta < -50) mean that charging stops if the voltage went up very quickly? Bye, Uwe. Received on 2002-08-08 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |