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| author | px4dev <px4@purgatory.org> | 2013-01-25 21:35:32 -0800 |
|---|---|---|
| committer | px4dev <px4@purgatory.org> | 2013-01-25 21:35:32 -0800 |
| commit | 82f72b96de81478fb5d627be30a2f81ef2c5135f (patch) | |
| tree | 18d23a76ae74bb4d90f9531eb2850e1cafca78f1 /apps/px4io | |
| parent | 24f6c6b121ea87b26a2c5cac933089be496a28b6 (diff) | |
| download | px4-firmware-82f72b96de81478fb5d627be30a2f81ef2c5135f.tar.gz px4-firmware-82f72b96de81478fb5d627be30a2f81ef2c5135f.tar.bz2 px4-firmware-82f72b96de81478fb5d627be30a2f81ef2c5135f.zip | |
Move DMA start for tx/rx into the gap where SCL is still stretched so that there is no risk of receiving the first byte before DMA starts.
Diffstat (limited to 'apps/px4io')
| -rw-r--r-- | apps/px4io/i2c.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/apps/px4io/i2c.c b/apps/px4io/i2c.c index 174ec2813..bbb72360b 100644 --- a/apps/px4io/i2c.c +++ b/apps/px4io/i2c.c @@ -158,6 +158,9 @@ i2c_interrupt(int irq, FAR void *context) if (sr1 & I2C_SR1_ADDR) { + stm32_dmastart(tx_dma, NULL, NULL, false); + stm32_dmastart(rx_dma, NULL, NULL, false); + /* clear ADDR to ack our selection and get direction */ (void)rSR1; /* as recommended, re-read SR1 */ uint16_t sr2 = rSR2; @@ -166,13 +169,11 @@ i2c_interrupt(int irq, FAR void *context) /* we are the transmitter */ direction = DIR_TX; - stm32_dmastart(tx_dma, NULL, NULL, false); } else { /* we are the receiver */ direction = DIR_RX; - stm32_dmastart(rx_dma, NULL, NULL, false); } } |