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annotate target-utils/lunadrv/sleep.c @ 922:3152e23399a2

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document SE K2x0 FFS quirks and our support for them
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 02 Jan 2023 00:50:19 +0000
parents 57f7db8c4f45
children
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849
a66095c7f35f lunadrv: add suspend and resume commands
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1 /*
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2 * This module implements suspend and resume commands for entering
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3 * and exiting ILI9225G sleep mode. These commands are expected
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4 * to work the same on both HaoRan and Formike LCDs, but the
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5 * current measurement resistor that allows one to see the actual
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6 * power supply current drawn by the LCD is present only on lunalcd2
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7 * boards.
a66095c7f35f lunadrv: add suspend and resume commands
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8 */
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9
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10 #include "types.h"
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11 #include "luna.h"
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12
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13 void
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14 cmd_suspend()
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15 {
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16 LCD_REG_WR(0x0007, 0); /* display off */
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17 wait_ARM_cycles(DELAY_1MS * 50);
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18 LCD_REG_WR(0x0010, 1); /* suspend mode */
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19 }
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20
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21 void
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22 cmd_resume()
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23 {
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24 LCD_REG_WR(0x0010, 0); /* out of suspend */
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25 wait_ARM_cycles(DELAY_1MS * 50);
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26 LCD_REG_WR(0x0007, 0x1017); /* display on */
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27 }
865
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28
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29 /*
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30 * If we wish to run sans-UI firmware on an LCD-equipped board,
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31 * we would like to put the ILI9225G controller into its lowest
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32 * power mode, without doing anything else to it. The following
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33 * reset-suspend command prototypes this functionality.
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34 */
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35
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36 void
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37 cmd_reset_suspend()
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38 {
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39 /* reset pulse */
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40 CNTL_RST_REG |= EXT_RESET;
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41 wait_ARM_cycles(DELAY_1MS * 10);
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42 CNTL_RST_REG &= ~EXT_RESET;
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43 /* datasheet says it needs 50 ms */
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44 wait_ARM_cycles(DELAY_1MS * 50);
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45 /* and straight into suspend mode */
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46 LCD_REG_WR(0x0010, 1);
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47 }