FreeCalypso > hg > freecalypso-tools
view target-utils/flash-boot-test/watchdog.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 | 3d7b546c710c |
children |
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#include <sys/types.h> #include "types.h" void cmd_wd() { /* stop/disable the watchdog timer */ *(volatile u16 *)0xFFFFF804 = 0xF5; *(volatile u16 *)0xFFFFF804 = 0xA0; } void cmd_we() { /* watchdog enable */ *(volatile u16 *)0xFFFFF804 = 0x8000; } void cmd_wr() { /* read and display watchdog downcount register */ printf("%04X\n", *(volatile u16 *)0xFFFFF802); } void cmd_ww(argbulk) char *argbulk; { /* single or double write to WATCHDOG_TIM_MODE */ char *argv[3]; u_long w1, w2; if (parse_args(argbulk, 1, 2, argv, 0) < 0) return; if (parse_hexarg(argv[0], 4, &w1) < 0) { printf("ERROR: arg1 must be a valid 16-bit hex value\n"); return; } if (argv[1] && parse_hexarg(argv[1], 4, &w2) < 0) { printf("ERROR: arg2 must be a valid 16-bit hex value\n"); return; } /* do it */ *(volatile u16 *)0xFFFFF804 = w1; if (argv[1]) *(volatile u16 *)0xFFFFF804 = w2; }