diff options
Diffstat (limited to 'chip/lm4/adc.c')
| -rw-r--r-- | chip/lm4/adc.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/chip/lm4/adc.c b/chip/lm4/adc.c index 365a2776c9..b3e24809a8 100644 --- a/chip/lm4/adc.c +++ b/chip/lm4/adc.c @@ -120,7 +120,17 @@ static void lm4_adc_configure(const struct adc_t *adc) int adc_read_channel(enum adc_channel ch) { const struct adc_t *adc = adc_channels + ch; - int rv = lm4_adc_flush_and_read(adc->sequencer); + int rv; + + /* Enable ADC0 module in run and sleep modes. */ + clock_enable_peripheral(CGC_OFFSET_ADC, 0x1, + CGC_MODE_RUN | CGC_MODE_SLEEP); + + rv = lm4_adc_flush_and_read(adc->sequencer); + + /* Disable ADC0 module to conserve power. */ + clock_disable_peripheral(CGC_OFFSET_ADC, 0x1, + CGC_MODE_RUN | CGC_MODE_SLEEP); if (rv == ADC_READ_ERROR) return ADC_READ_ERROR; @@ -236,5 +246,9 @@ static void adc_init(void) /* Initialize ADC sequencer */ for (i = 0; i < ADC_CH_COUNT; ++i) lm4_adc_configure(adc_channels + i); + + /* Disable ADC0 module until it is needed to conserve power. */ + clock_disable_peripheral(CGC_OFFSET_ADC, 0x1, + CGC_MODE_RUN | CGC_MODE_SLEEP); } DECLARE_HOOK(HOOK_INIT, adc_init, HOOK_PRIO_DEFAULT); |