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Use the internal references for ADC, this fixes the ADC readings on uBMC.

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Tested on BBB and uBMC.

Sponsored by:	Rubicon Communications (Netgate)
This commit is contained in:
Luiz Otavio O Souza 2016-03-21 03:39:38 +00:00
parent 51f8a15cad
commit e5ee119ae0
1 changed files with 5 additions and 9 deletions
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14
sys/arm/ti/ti_adc.c
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@ -161,11 +161,9 @@ ti_adc_input_setup(struct ti_adc_softc *sc, int32_t ain)
/* Set the negative voltage reference. */
val &= ~ADC_STEP_RFM_MSK;
val |= ADC_STEP_RFM_VREFN << ADC_STEP_RFM_SHIFT;
/* Set the positive voltage reference. */
val &= ~ADC_STEP_RFP_MSK;
val |= ADC_STEP_RFP_VREFP << ADC_STEP_RFP_SHIFT;
/* Set the samples average. */
val &= ~ADC_STEP_AVG_MSK;
@ -450,11 +448,9 @@ ti_adc_idlestep_init(struct ti_adc_softc *sc)
/* Set the negative voltage reference. */
val &= ~ADC_STEP_RFM_MSK;
val |= ADC_STEP_RFM_VREFN << ADC_STEP_RFM_SHIFT;
/* Set the positive voltage reference. */
val &= ~ADC_STEP_RFP_MSK;
val |= ADC_STEP_RFP_VREFP << ADC_STEP_RFP_SHIFT;
/* Connect the input to VREFN. */
val &= ~ADC_STEP_INP_MSK;
@ -484,6 +480,11 @@ ti_adc_attach(device_t dev)
sc = device_get_softc(dev);
sc->sc_dev = dev;
/* Activate the ADC_TSC module. */
err = ti_prcm_clk_enable(TSC_ADC_CLK);
if (err)
return (err);
rid = 0;
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
@ -509,11 +510,6 @@ ti_adc_attach(device_t dev)
return (ENXIO);
}
/* Activate the ADC_TSC module. */
err = ti_prcm_clk_enable(TSC_ADC_CLK);
if (err)
return (err);
/* Check the ADC revision. */
rev = ADC_READ4(sc, ADC_REVISION);
device_printf(dev,