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view src/g23m-aci/aci/ati_fchg.c @ 220:0ed36de51973

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ABB semaphore protection overhaul The ABB semaphone protection logic that came with TCS211 from TI was broken in several ways: * Some semaphore-protected functions were called from Application_Initialize() context. NU_Obtain_Semaphore() called with NU_SUSPEND fails with NU_INVALID_SUSPEND in this context, but the return value wasn't checked, and NU_Release_Semaphore() would be called unconditionally at the end. The latter call would increment the semaphore count past 1, making the semaphore no longer binary and thus no longer effective for resource protection. The fix is to check the return value from NU_Obtain_Semaphore() and skip the NU_Release_Semaphore() call if the semaphore wasn't properly obtained. * Some SPI hardware manipulation was being done before entering the semaphore- protected critical section. The fix is to reorder the code: first obtain the semaphore, then do everything else. * In the corner case of L1/DSP recovery, l1_abb_power_on() would call some non-semaphore-protected ABB & SPI init functions. The fix is to skip those calls in the case of recovery. * A few additional corner cases existed, all of which are fixed by making ABB semaphore protection 100% consistent for all ABB functions and code paths. There is still one remaining problem of priority inversion: suppose a low- priority task calls an ABB function, and some medium-priority task just happens to preempt right in the middle of that semaphore-protected ABB operation. Then the high-priority SPI task is locked out for a non-deterministic time until that medium-priority task finishes its work and goes back to sleep. This priority inversion problem remains outstanding for now.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Apr 2021 20:55:25 +0000
parents 089c1882788c
children
line wrap: on
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/*
 * The non-standard FreeCalypso-added AT commands implemented in this module
 * expose the API of FreeCalypso battery charging driver FCHG.
 */

#ifndef ATI_FCHG_C
#define ATI_FCHG_C

#include "aci_all.h"

#include <ctype.h>
#include <string.h>

#include "aci_cmh.h"
#include "ati_cmd.h"
#include "aci_cmd.h"
#include "aci_io.h"
#include "aci_cmd.h"
#include "l4_tim.h"
#include "line_edit.h"
#include "aci_lst.h"

#include "pcm.h"
#include "audio.h"
#include "aci.h"
#include "rx.h"
#include "pwr.h"
#include "l4_tim.h"

#ifdef GPRS
#ifdef DTI
#include "dti.h"
#include "dti_conn_mng.h"
#include "dti_cntrl_mng.h"
#endif /* DTI */
#include "gaci.h"
#include "gaci_cmh.h"
#include "gaci_cmd.h"
#endif  /* GPRS */

#include "aci_mem.h"
#include "aci_prs.h"

#include "ati_int.h"

#ifndef _SIMULATION_
#include "ffs/ffs.h"
#endif

#ifdef FF_ATI_BAT

#include "typedefs.h"
#include "gdd.h"
#include "bat.h"

#include "ati_bat.h"

#endif /*FF_ATI_BAT*/

#include "rv/rv_defined_swe.h"     // for RVM_FCHG_SWE

#ifdef RVM_FCHG_SWE
#include "fchg/fchg_api.h"

/* AT%CBC - customized alternative to standard AT+CBC */
GLOBAL T_ATI_RSLT atPercentCBC ( char *cl, UBYTE srcId )
{
	struct fchg_user_state fchg;

	TRACE_FUNCTION("atPercentCBC()");
	if (fchg_get_current_state(&fchg) != RV_OK)
		return ATI_FAIL;
	sprintf(g_sa, "%%CBC: %d,%d,%d,%d", fchg.chg_state, fchg.batt_mv,
		fchg.batt_percent, fchg.ichg);
	io_sendMessage(srcId, g_sa, ATI_NORMAL_OUTPUT);
	return ATI_CMPL;
}

/* AT@CHG - manual control of battery charging */
GLOBAL T_ATI_RSLT atAtCHG ( char *cl, UBYTE srcId )
{
	enum fchg_user_charge_ctrl ctrl;

	TRACE_FUNCTION("atAtCHG()");
	cl = parse(cl, "D", &ctrl);
	if (!cl)
		return ATI_FAIL;
	if (fchg_user_charge_control(ctrl) == RV_OK)
		return ATI_CMPL;
	else
		return ATI_FAIL;
}

#endif /* RVM_FCHG_SWE */

/* AT%VBAT - retrieve VBAT measurement, independent of FCHG */
GLOBAL T_ATI_RSLT atPercentVBAT ( char *cl, UBYTE srcId )
{
	extern USHORT *csf_return_adc(void);
	USHORT *adc_conversion;

	TRACE_FUNCTION("atPercentVBAT()");
	adc_conversion = csf_return_adc();
	sprintf(g_sa, "%%VBAT: %u", adc_conversion[0]);
	io_sendMessage(srcId, g_sa, ATI_NORMAL_OUTPUT);
	return ATI_CMPL;
}

#endif /* ATI_FCHG_C */