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bootloader: disconnect VRTC from SAR input in bootloader_random_disable

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Bootloader enables SAR ADC in test mode to get some entropy for the RNG.
The bits which control the ADC test mux were not disabled, which caused
extra ~24uA current to be drawn from VRTC, increasing deep sleep current
consumption. This change disables relevant test mode bits in
bootloader_random_disable.
This commit is contained in:
Ivan Grokhotkov 2017-02-21 12:10:49 +08:00
parent 1405fd1fef
commit 3b583c150f
1 changed files with 4 additions and 0 deletions
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4
components/bootloader_support/src/bootloader_random.c
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@ -135,4 +135,8 @@ void bootloader_random_disable(void)
/* Reset i2s peripheral */
SET_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_I2S0_RST);
CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_I2S0_RST);
/* Disable pull supply voltage to SAR ADC */
CLEAR_PERI_REG_MASK(RTC_CNTL_TEST_MUX_REG, RTC_CNTL_ENT_RTC);
SET_PERI_REG_BITS(RTC_CNTL_TEST_MUX_REG, RTC_CNTL_DTEST_RTC, 0, RTC_CNTL_DTEST_RTC_S);
}