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FMC ADC 100M 14b 4cha - Software
Commit 80613102 authored by Federico Vaga's avatar Federico Vaga
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drv: add function to just set the offset 

Signed-off-by: Federico Vaga's avatarFederico Vaga <federico.vaga@cern.ch>
parent 45aed88c
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Showing with 15 additions and 2 deletions
kernel/fa-core.c
View file @ 80613102
......@@ -91,6 +91,20 @@ int zfad_pattern_data_enable(struct fa_dev *fa, uint16_t pattern,
return 0;
}
/**
* It sets the DAC voltage to apply an offset on the input channel
* @chan
* @val DAC values (-5V: 0x0000, 0V: 0x8000, +5V: 0x7FFF)
*
* Return: 0 on success, otherwise a negative error number
*/
static int zfad_dac_set(struct zio_channel *chan, uint32_t val)
{
struct fa_dev *fa = get_zfadc(&chan->cset->zdev->head.dev);
return fa_spi_xfer(fa, FA_SPI_SS_DAC(chan->index), 16, val, NULL);
}
/*
* zfad_apply_user_offset
* @fa: the fmc-adc descriptor
......@@ -136,8 +150,7 @@ int zfad_apply_user_offset(struct fa_dev *fa, struct zio_channel *chan,
if (hwval > 0xffff)
hwval = 0xffff;
/* Apply calibrated offset to DAC */
return fa_spi_xfer(fa, FA_SPI_SS_DAC(chan->index), 16, hwval, NULL);
return zfad_dac_set(chan, hwval);
}
/*
......
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