FreeCalypso > hg > freecalypso-tools
view target-utils/lunadrv/sleep.c @ 965:2969032bdfac
fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing
The only 100% safe way to pass a NULL pointer as a function argument
in K&R C is to cast 0 to a pointer type; failing to do so may cause
mysterious bugs (invalid stack frames or garbage in argument registers)
on 64-bit machines. This issue has already been fixed in most of
FC host tools, but I just found some missed spots: passing of NULL UDH
to PDU encoding functions in fcup-smsend[mult] in the case of single
(not concatenated) SMS.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Fri, 01 Sep 2023 07:33:51 +0000 |
parents | 57f7db8c4f45 |
children |
line wrap: on
line source
/* * This module implements suspend and resume commands for entering * and exiting ILI9225G sleep mode. These commands are expected * to work the same on both HaoRan and Formike LCDs, but the * current measurement resistor that allows one to see the actual * power supply current drawn by the LCD is present only on lunalcd2 * boards. */ #include "types.h" #include "luna.h" void cmd_suspend() { LCD_REG_WR(0x0007, 0); /* display off */ wait_ARM_cycles(DELAY_1MS * 50); LCD_REG_WR(0x0010, 1); /* suspend mode */ } void cmd_resume() { LCD_REG_WR(0x0010, 0); /* out of suspend */ wait_ARM_cycles(DELAY_1MS * 50); LCD_REG_WR(0x0007, 0x1017); /* display on */ } /* * If we wish to run sans-UI firmware on an LCD-equipped board, * we would like to put the ILI9225G controller into its lowest * power mode, without doing anything else to it. The following * reset-suspend command prototypes this functionality. */ void cmd_reset_suspend() { /* reset pulse */ CNTL_RST_REG |= EXT_RESET; wait_ARM_cycles(DELAY_1MS * 10); CNTL_RST_REG &= ~EXT_RESET; /* datasheet says it needs 50 ms */ wait_ARM_cycles(DELAY_1MS * 50); /* and straight into suspend mode */ LCD_REG_WR(0x0010, 1); }