FreeCalypso > hg > freecalypso-tools
view target-utils/c139explore/backlight.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 | 5d9d95530256 |
children |
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#include <sys/types.h> #include <strings.h> #include "types.h" #include "abbdefs.h" #define GPIO_OUT_REG (*(volatile u16 *) 0xfffe4802) #define BACKLIGHT_GPIO_MASK 0x0002 #define AUXLED_KPBL_OFF 0x000 #define AUXLED_KPBL_ON 0x002 void cmd_dbl(argbulk) char *argbulk; { char *argv[2]; if (parse_args(argbulk, 1, 1, argv, 0) < 0) return; if (!strcmp(argv[0], "on")) GPIO_OUT_REG |= BACKLIGHT_GPIO_MASK; else if (!strcmp(argv[0], "off")) GPIO_OUT_REG &= ~BACKLIGHT_GPIO_MASK; else printf("ERROR: \"on\" or \"off\" argument expected\n"); } void cmd_kpbl(argbulk) char *argbulk; { char *argv[2]; if (parse_args(argbulk, 1, 1, argv, 0) < 0) return; if (!strcmp(argv[0], "on")) abb_reg_write(AUXLED, AUXLED_KPBL_ON); else if (!strcmp(argv[0], "off")) abb_reg_write(AUXLED, AUXLED_KPBL_OFF); else printf("ERROR: \"on\" or \"off\" argument expected\n"); }