forked from len0rd/rockbox
87c6df98a3
This test program. I add it mainly to document somehow my work: 1) atj213x.h lists registers addresses 2) crt0.S exploits self relocation of the binary 3) test_bl.c documents how to control backlight on e150 Change-Id: I055e0fe065d926a5c3805b73cea3f537cb64bf52
42 lines
924 B
C
42 lines
924 B
C
#include "atj213x.h"
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static void backlight_set(int level)
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{
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/* set duty cycle in 1/32 units */
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PMU_CHG = ((PMU_CHG & ~PMU_CHG_PDOUT_MASK) | PMU_CHG_PDUT(level));
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}
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static void wdt_feed(void)
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{
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RTC_WDCTL |= RTC_WDCTL_CLR;
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}
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int main(void)
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{
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int i = 0, j = 0;
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/* backlight clock enable, select backlight clock as 32kHz */
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CMU_FMCLK = (CMU_FMCLK & ~(CMU_FMCLK_BCLK_MASK)) | CMU_FMCLK_BCKE | CMU_FMCLK_BCLK_32K;
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/* baclight enable */
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PMU_CTL |= PMU_CTL_BL_EN;
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/* pwm output, phase high, some initial duty cycle set as 24/32 */
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PMU_CHG = ((PMU_CHG & ~PMU_CHG_PDOUT_MASK)| PMU_CHG_PBLS_PWM | PMU_CHG_PPHS_HIGH | PMU_CHG_PDUT(24));
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while(1)
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{
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/* otherwise wdt will trigger reset */
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wdt_feed();
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/* arbitrary delay */
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if (++i > 30000)
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{
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i = 0;
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j++;
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backlight_set(j);
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}
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}
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return 0;
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}
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