diff options
| author | Keith Packard <keithp@keithp.com> | 2012-04-09 00:05:18 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2012-04-09 00:05:18 -0700 |
| commit | 059f09dbca4703c25b42389b54c6510331c39485 (patch) | |
| tree | 2221695d0bd96527a162be7e4b2520811f2c25ab /src/stm/ao_adc_stm.c | |
| parent | f7cfbbce2b94b5ac0094a0e34e1766fe1ceb12c8 (diff) | |
altos: Allow STM DMA channels to be reserved for one use
This allows a single user of a DMA channel to reserve it for use
without needing to lock the mutex; this is required for DMA from the
ADC to work on megametrum as it wants to start DMA from an interrupt
handler, which cannot block on a mutex.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src/stm/ao_adc_stm.c')
| -rw-r--r-- | src/stm/ao_adc_stm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/stm/ao_adc_stm.c b/src/stm/ao_adc_stm.c index d758e629..729551c4 100644 --- a/src/stm/ao_adc_stm.c +++ b/src/stm/ao_adc_stm.c @@ -221,5 +221,7 @@ ao_adc_init(void) /* Clear any stale status bits */ stm_adc.sr = 0; ao_adc_ready = 1; + + ao_dma_alloc(STM_DMA_INDEX(STM_DMA_CHANNEL_ADC1)); ao_cmd_register(&ao_adc_cmds[0]); } |