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view src/cs/riviera/rvt/rvt_keepalive.c @ 629:3231dd9b38c1

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armio.c: make GPIOs 8 & 13 outputs driving 1 on all "classic" targets Calypso GPIOs 8 & 13 are pinmuxed with MCUEN1 & MCUEN2, respectively, and on powerup these pins are MCUEN, i.e., outputs driving 1. TI's code for C-Sample and earlier turns them into GPIOs configured as outputs also driving 1 - so far, so good - but TI's code for BOARD 41 (which covers D-Sample, Leonardo and all real world Calypso devices derived from the latter) switches them from MCUEN to GPIOs, but then leaves them as inputs. Given that the hardware powerup state of these two pins is outputs driving 1, every Calypso board design MUST be compatible with such driving; typically these GPIO signals will be either unused and unconnected or connected as outputs driving some peripheral. Turning these pins into GPIO inputs will result in floating inputs on every reasonably-wired board, thus I am convinced that this configuration is nothing but a bug on the part of whoever wrote this code at TI. This floating input bug had already been fixed earlier for GTA modem and FCDEV3B targets; the present change makes the fix unconditional for all "classic" targets. The newly affected targets are D-Sample, Leonardo, Tango and GTM900.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 02 Jan 2020 05:38:26 +0000
parents 9ffdfacfe969
children
line wrap: on
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/*
 * This module is a FreeCalypso addition.  Here we implement the special
 * operation mode that is only used when a device that was originally
 * meant to be a phone handset is turned into a pseudo-modem with no UI,
 * requiring connection to a host computer running rvinterf for control.
 */

#ifdef PSEUDO_MODEM_KEEPALIVE

#include "nucleus.h"

#include "abb.h"

#include "rv/general.h"
#include "rv/rv_general.h"
#include "rvf/rvf_api.h"
#include "rvt/rvt_gen.h"
#include "rvt/rvt_def_i.h"
#include "rvt/rvt_env.h"
#include "rvt/rvt_env_i.h"
#include "rvm/rvm_use_id_list.h"

#include "uart/serialswitch.h"

#include <string.h>

volatile UINT8 rvt_keepalive_counter;

void rvt_keepalive_input(T_RVT_BUFFER p_msg, UINT16 msg_length)
{
	/* Checking for an invalid PDU. */
	if ((p_msg == NULL) || (msg_length != 1))
		return;

	/* Check for the correct opcode */
	if (*p_msg != 'A')
		return;

	/* good keepalive response from external host */
	rvt_keepalive_counter = 0;
}

void rvt_keepalive_register(void)
{
	T_RVT_USER_ID rvt_id;

	rvt_register_id("KEEPALIVE", &rvt_id, rvt_keepalive_input);
}

static void keepalive_send(UINT8 *buf, UINT32 size)
{
	UINT32 sent;

	for (sent = 0; sent < size; )
		sent += SER_tr_WriteNBytes(SER_LAYER_1, buf + sent,
					   size - sent);
}

#ifdef PSEUDO_MODEM_USB
static char poweroff_msg[] = "System: USB unplugged, powering off";
#else
static char poweroff_msg[] = "System: no keepalive response, powering off";
static UINT8 keepalive_msg[2] = {RVT_KEEPALIVE_HEADER, 'Q'};
#endif

static void keepalive_poweroff(void)
{
	UINT8 poweroff_msg_buf[50], *p;

	p = poweroff_msg_buf;
	*p++ = RVT_RV_HEADER;
	*p++ = 0;
	*p++ = 0;
	*p++ = 0;
	*p++ = 0;
	*p++ = RV_TRACE_LEVEL_ERROR;
	strcpy((char *)p, poweroff_msg);
	keepalive_send(poweroff_msg_buf, strlen(poweroff_msg) + 6);
	/* do it */
	ABB_Power_Off();
}

void rvt_keepalive_process(void)
{
	SYS_UWORD16 abb_status;

	abb_status = ABB_Read_Status();
	if (abb_status & CHGPRES) {
		rvt_keepalive_counter = 0;
		return;
	}

#ifdef PSEUDO_MODEM_USB
	keepalive_poweroff();
#else
	if (rvt_keepalive_counter >= 3)
		keepalive_poweroff();
	else {
		rvt_keepalive_counter++;
		keepalive_send(keepalive_msg, sizeof keepalive_msg);
	}
#endif
}

#endif