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as3525: reverting I2C2 to non-interrupts version

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Interrupts version is cause of freeze on USB extraction.
Also non-interrupts version much simpler and faster.

Change-Id: I30a2993cdcaa85abfba77ca06bfacd5b6b4353e2
This commit is contained in:
Mihail Zenkov 2016-02-20 03:36:26 +00:00
parent ce90c0481a
commit c7daef36c5
4 changed files with 126 additions and 402 deletions
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32
firmware/drivers/adc-as3514.c
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@ -26,40 +26,18 @@
/* Read 10-bit channel data */
unsigned short adc_read(int channel)
{
unsigned short data = 0;
if ((unsigned)channel >= NUM_ADC_CHANNELS)
return 0;
unsigned char buf[2];
ascodec_lock();
/* Select channel */
if (ascodec_write(AS3514_ADC_0, (channel << 4)) >= 0)
{
unsigned char buf[2];
ascodec_write(AS3514_ADC_0, (channel << 4));
/*
* The AS3514 ADC will trigger an interrupt when the conversion
* is finished, if the corresponding enable bit in IRQ_ENRD2
* is set.
* Previously the code did not wait and this apparently did
* not pose any problems, but this should be more correct.
* Without the wait the data read back may be completely or
* partially (first one of the two bytes) stale.
*/
ascodec_wait_adc_finished();
/* Read data */
if (ascodec_readbytes(AS3514_ADC_0, 2, buf) >= 0)
{
data = (((buf[0] & 0x3) << 8) | buf[1]);
}
}
ascodec_readbytes(AS3514_ADC_0, 2, buf);
ascodec_unlock();
return data;
return (((buf[0] & 0x3) << 8) | buf[1]);
}
void adc_init(void)