FreeCalypso > hg > freecalypso-tools
view loadtools/gtapower.c @ 497:74610c4f10f7
target-utils: added 10 ms delay at the end of abb_power_off()
The deosmification of the ABB access code (replacement of osmo_delay_ms()
bogus delays with correctly-timed ones, which are significantly shorter)
had one annoying side effect: when executing the poweroff command from
any of the programs, one last '=' prompt character was being sent (and
received by the x86 host) as the Calypso board powers off. With delays
being shorter now, the abb_power_off() function was returning and the
standalone program's main loop was printing its prompt before the Iota chip
fully executed the switch-off sequence!
I thought about inserting an endless tight loop at the end of the
abb_power_off() function, but the implemented solution of a 10 ms delay
is a little nicer IMO because if the DEVOFF operation doesn't happen for
some reason in a manual hacking scenario, there won't be an artificial
blocker in the form of a tight loop keeping us from further poking around.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 25 May 2019 20:44:05 +0000 |
parents | e7502631a0f9 |
children |
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/* * This module is included only when loadtools are being built to run on the * GTA0x application processor (AP). It provides automated modem power * control, i.e., coordinates modem power control with loadtools operations * for convenience. */ #include <sys/types.h> #include <sys/file.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> /* * Check this pathname: it is correct for the kernel version I'm using * on my test GTA02, but it differs for some other kernel versions. */ static char modem_powerctl_pathname[] = "/sys/bus/platform/devices/gta02-pm-gsm.0/power_on"; void set_gta_modem_power_ctrl(boolval) { char strbuf[16]; int len, fd; len = sprintf(strbuf, "%d\n", boolval); fd = open(modem_powerctl_pathname, O_WRONLY); if (fd < 0) { perror(modem_powerctl_pathname); exit(1); } write(fd, strbuf, len); close(fd); } void fork_gta_modem_poweron() { int i; i = fork(); if (i < 0) { perror("fork"); exit(1); } if (i) return; printf("Toggling %s\n", modem_powerctl_pathname); set_gta_modem_power_ctrl(0); usleep(350000); set_gta_modem_power_ctrl(1); exit(0); }