diff options
Diffstat (limited to 'firmware')
| -rw-r--r-- | firmware/target/coldfire/iaudio/m3/adc-m3.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/firmware/target/coldfire/iaudio/m3/adc-m3.c b/firmware/target/coldfire/iaudio/m3/adc-m3.c index b0d7f7430b..1f17b1e3f1 100644 --- a/firmware/target/coldfire/iaudio/m3/adc-m3.c +++ b/firmware/target/coldfire/iaudio/m3/adc-m3.c @@ -51,8 +51,8 @@ void IIC2(void) MBSR2 &= ~IFF; /* Clear interrupt flag */ - if (MBSR2 & IAL) /* Arbitration lost - shouldn't happen */ - { /* normally, but CPU freq change might induce it */ + if (MBSR2 & IAL) /* Arbitration lost - shouldn't never happen */ + { MBSR2 &= ~IAL; /* Clear flag */ MBCR2 &= ~MSTA; /* STOP */ } @@ -97,7 +97,6 @@ void adc_init(void) MBSR2 = 0; /* Clear flags */ MBCR2 = (IEN|IIEN); /* Enable interrupts */ - and_l(~0x0f000000, &INTPRI8); or_l( 0x04000000, &INTPRI8); /* INT62 - Priority 4 */ tick_add_task(adc_tick); @@ -105,3 +104,15 @@ void adc_init(void) while (!data_ready) sleep(1); /* Ensure valid readings when adc_init returns */ } + +/* The ADC (most probably the PIC12F675) obviously has a slow and buggy I²C + * implementation. If a transfer is stopped prematurely, it often locks up + * and doesn't react anymore until the unit is power cycled. */ + +void adc_close(void) +{ + tick_remove_task(adc_tick); + + while (MBSR2 & IBB) /* Wait for an ongoing transfer to finish */ + sleep(1); +} |