FreeCalypso > hg > freecalypso-tools

annotate target-utils/buzplayer/timer.c @ 505:7bf0d909c87e

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fc-loadtool flash ID check: change of reset after the check logic This change only affects those flash configurations that have ID checks enabled. The logic for resetting the flash after the ID check has been changed as follows: 1) If the check fails, we return without attempting to reset the flash. 2) If the check is successful, we reset the flash using the configured method (could be AMD or Intel or Intel W30) instead of always doing an AMD flash reset as the original code did.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 May 2019 19:58:01 +0000
parents e3d40f49d8c4
children
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1 /*
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2 * FreeCalypso buzzer "melodies" have times measured in TDMA frames,
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3 * as that is the time unit in the main firmware which will ultimately
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4 * play them. In this standalone buzzer player we simulate TDMA frame
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5 * timing by programming Calypso TIMER1 with the period of 1875, and
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6 * we detect timer overflow (one virtual TDMA frame time having passed)
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7 * by polling the read register to avoid the need for interrupt handling
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8 * infrastructure.
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9 */
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10
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11 #include "types.h"
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12 #include "timer.h"
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13
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14 void
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15 timer_init()
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16 {
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17 TIMER1_REGS.cntl = CNTL_CLOCK_ENABLE;
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18 TIMER1_REGS.load = 1875;
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19 TIMER1_REGS.cntl = CNTL_CLOCK_ENABLE | CNTL_AUTO_RELOAD | CNTL_START;
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20 }
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22 void
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23 wait_for_tdma_frame()
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24 {
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25 u16 read1, read2;
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27 read1 = TIMER1_REGS.read;
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28 for (;;) {
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29 read2 = TIMER1_REGS.read;
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30 if (read2 > read1)
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31 return;
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32 read1 = read2;
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33 }
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34 }