--- /dev/null
+/* This file has been prepared for Doxygen automatic documentation generation.*/\r
+/*! \file *********************************************************************\r
+ *\r
+ * \brief\r
+ * Charge state function for NiMH batteries\r
+ *\r
+ * Contains the charge state function, in which the NiMH charging\r
+ * algorithm is, plus the associated functions.\r
+ *\r
+ * \par Application note:\r
+ * AVR463: Charging NiMH Batteries with BC100 \n\r
+ *\r
+ * \par Documentation\r
+ * For comprehensive code documentation, supported compilers, compiler \r
+ * settings and supported devices see readme.html\r
+ *\r
+ * \author\r
+ * Atmel Corporation: http://www.atmel.com \n\r
+ * Support email: avr@atmel.com\r
+ *\r
+ * \r
+ * $Name$\r
+ * $Revision: 2255 $\r
+ * $RCSfile$\r
+ * $URL: http://svn.norway.atmel.com/AppsAVR8/avr463_Charging_NiMH_Batteries_with_BC100/trunk/code/IAR/NIMHcharge.c $\r
+ * $Date: 2007-08-09 14:47:58 +0200 (to, 09 aug 2007) $\n\r
+ ******************************************************************************/\r
+\r
+#include <avr/io.h>\r
+\r
+#include "enums.h"\r
+#include "structs.h"\r
+\r
+#include "battery.h"\r
+#include "charge.h"\r
+#include "chargefunc.h"\r
+#include "main.h"\r
+#include "menu.h"\r
+#include "NIMHspecs.h"\r
+#include "PWM.h"\r
+#include "time.h"\r
+\r
+#ifndef NIMH\r
+#error NIMH not defined in main.h!\r
+#endif // NIMH\r
+\r
+\r
+//******************************************************************************\r
+// Functions\r
+//******************************************************************************\r
+/*! \brief Controls the charging.\r
+ *\r
+ * This function contains the charging algorithm itself, divided into stages.\n\r
+ * For each stage the PWM may be started/stopped, and the timer, \r
+ * halt-requirements and charge parameters may be set.\n\r
+ * The charging functions return whatever state is next, and as long as no\r
+ * errors occur this is the next charging stage.\r
+ *\r
+ * \note If more stages are needed simply define more states in menu.h, include\r
+ * them in \ref menu_state[] in menu.c, then add the cases to this function.\r
+ *\r
+ * \note This algorithm is for NiMH batteries.\r
+ */\r
+unsigned char Charge(unsigned char inp)\r
+{\r
+ unsigned char NextState;\r
+\r
+ switch (CurrentState) {\r
+ // First stage is a prequalification. Attempt to charge battery to 1 V,\r
+ // using a 0.1 C current, within 2 minutes.\r
+ // If this fails, the battery is likely damaged.\r
+ // If it succeeds, start a fast charge.\r
+ case ST_PREQUAL:\r
+ \r
+ // Set up charge current and next state.\r
+ ChargeParameters.Current = BattData.Capacity / 10;\r
+ ChargeParameters.NextState = ST_FASTCHARGE;\r
+ \r
+ // Halt charge on voltage limit or timeout.\r
+ // Timeout means battery exhaustion.\r
+ HaltParameters.HaltFlags = (HALT_VOLTAGE_MAX | HALT_TIME |\r
+ HALT_FLAG_EXHAUSTION);\r
+ \r
+ // Set up voltage limit and temperature limits.\r
+ HaltParameters.VoltageMax = BAT_VOLTAGE_PREQUAL;\r
+ HaltParameters.TemperatureMin = BAT_TEMPERATURE_MIN;\r
+ HaltParameters.TemperatureMax = 35;\r
+ \r
+ // Reset temperature measurement for HaltNow().\r
+ HaltParameters.LastNTC = 0;\r
+ \r
+ // Start PWM and charge timer before calling the charge function.\r
+ PWM_Start();\r
+ Time_Set(TIMER_CHG, BAT_TIME_PREQUAL, 0, 0);\r
+ \r
+ // Call charge function, get next state.\r
+ NextState = ConstantCurrent();\r
+ break;\r
+\r
+\r
+ // Second stage is a fast charge. Charge at 1.0 C for at most 1.5 hours,\r
+ // until either rate of temperature increase or voltage reaches limit, or\r
+ // the voltage drops sufficiently.\r
+ // Timeout doesn't mean battery exhaustion now.\r
+ case ST_FASTCHARGE:\r
+\r
+ // Set up charge current and next state.\r
+ ChargeParameters.Current = BattData.Capacity;\r
+ ChargeParameters.NextState = ST_LOWRATECHARGE;\r
+ \r
+ // Halt charge on voltage limit, timeout, voltage drop or rate of \r
+ // temperature increase.\r
+ HaltParameters.HaltFlags = (HALT_VOLTAGE_MAX | HALT_TIME |\r
+ HALT_VOLTAGE_DROP | HALT_TEMPERATURE_RISE);\r
+ \r
+ // Set up limits for voltage, voltage drop, temperature and rate of \r
+ // temperature increase (1 degree C per minute).\r
+ HaltParameters.VoltageMax = BAT_VOLTAGE_MAX;\r
+ HaltParameters.VoltageDrop = BAT_VOLTAGE_DROP;\r
+ HaltParameters.TemperatureMax = BAT_TEMPERATURE_MAX;\r
+ HaltParameters.TemperatureRise = 1;\r
+ \r
+ // Reset maximum voltage measurement for HaltNow().\r
+ HaltParameters.VBATMax = 0;\r
+\r
+ // Start timer, PWM should still be running.\r
+ Time_Set(TIMER_CHG, BattData.MaxTime, 0, 0);\r
+\r
+ // Call charge function, get next state.\r
+ NextState = ConstantCurrent();\r
+ break;\r
+\r
+\r
+ // Last stage is a trickle charge. Charge at 0.1 C for at most 30 minutes,\r
+ // until either rate of temperature increase or voltage reaches limit.\r
+ case ST_LOWRATECHARGE:\r
+ \r
+ // Set up charge current and next state.\r
+ ChargeParameters.Current = BattData.Capacity / 10;\r
+ ChargeParameters.NextState = ST_ENDCHARGE;\r
+ \r
+ // Halt charge on voltage limit, timeout or temperature rise.\r
+ // Use the same requirements as during the last stage (ST_FASTCHARGE).\r
+ HaltParameters.HaltFlags = (HALT_VOLTAGE_MAX | HALT_TIME |\r
+ HALT_TEMPERATURE_RISE);\r
+\r
+ // Start timer, 30 minutes.\r
+ Time_Set(TIMER_CHG, 30, 0, 0);\r
+ \r
+ // Call charge function, get next state.\r
+ NextState = ConstantCurrent();\r
+ break;\r
+\r
+\r
+ // Charging is done!\r
+ case ST_ENDCHARGE:\r
+\r
+ // Stop the PWM output and flag battery as charged.\r
+ PWM_Stop();\r
+ BattData.Charged = TRUE;\r
+ \r
+ // If the other battery is enabled go to ST_BATCON, otherwise\r
+ // go to ST_SLEEP.\r
+ if (eeprom_read_byte(&BattControl[(BattActive+1)%2]) & BIT_BATTERY_ENABLED) {\r
+ NextState = ST_BATCON;\r
+ } else {\r
+ NextState = ST_SLEEP;\r
+ } \r
+ break;\r
+\r
+\r
+ default: // Shouldn't end up here. Reinitialize for safety.\r
+ NextState = ST_INIT;\r
+ break;\r
+ }\r
+\r
+ // Return the next state to main().\r
+ return(NextState);\r
+}\r
projects / avr_bc100.git / blobdiff