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stmhal/dac: Fix DAC (re-)initialisation by resetting DMA. 

Fixes issue #2176.
This commit is contained in:
Peter Hinch 2016-06-13 08:54:57 +01:00 committed by Damien George
parent 9526e24234
commit ef47a67cf4
1 changed files with 8 additions and 0 deletions
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8
stmhal/dac.c
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@ -171,6 +171,14 @@ STATIC mp_obj_t pyb_dac_init_helper(pyb_dac_obj_t *self, mp_uint_t n_args, const
#endif
// stop anything already going on
__DMA1_CLK_ENABLE();
DMA_HandleTypeDef DMA_Handle;
/* Get currently configured dma */
dma_init_handle(&DMA_Handle, self->tx_dma_descr, (void*)NULL);
// Need to deinit DMA first
DMA_Handle.State = HAL_DMA_STATE_READY;
HAL_DMA_DeInit(&DMA_Handle);
HAL_DAC_Stop(&DAC_Handle, self->dac_channel);
if ((self->dac_channel == DAC_CHANNEL_1 && DAC_Handle.DMA_Handle1 != NULL)
|| (self->dac_channel == DAC_CHANNEL_2 && DAC_Handle.DMA_Handle2 != NULL)) {