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| author | px4dev <px4@purgatory.org> | 2013-01-25 21:58:55 -0800 |
|---|---|---|
| committer | px4dev <px4@purgatory.org> | 2013-01-25 21:58:55 -0800 |
| commit | 6c75c5909e7f72897ddb737c6459ea6bbfab3900 (patch) | |
| tree | d8fc2dae3d6a947c7fbf5bcb910b29a5e32c85d0 /apps/px4io/i2c.c | |
| parent | 818e898a7e084d6529da549ca3ea7c7d53fe5c46 (diff) | |
| download | px4-firmware-6c75c5909e7f72897ddb737c6459ea6bbfab3900.tar.gz px4-firmware-6c75c5909e7f72897ddb737c6459ea6bbfab3900.tar.bz2 px4-firmware-6c75c5909e7f72897ddb737c6459ea6bbfab3900.zip | |
Move the DMA start to immediately after setting it up; less latency at interrupt time, and no chance of getting start/stop calls out of sync.
Diffstat (limited to 'apps/px4io/i2c.c')
| -rw-r--r-- | apps/px4io/i2c.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/apps/px4io/i2c.c b/apps/px4io/i2c.c index bbb72360b..dca5ceb1d 100644 --- a/apps/px4io/i2c.c +++ b/apps/px4io/i2c.c @@ -158,9 +158,6 @@ 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; @@ -222,6 +219,8 @@ i2c_rx_setup(void) DMA_CCR_PSIZE_32BITS | DMA_CCR_MSIZE_8BITS | DMA_CCR_PRIMED); + + stm32_dmastart(rx_dma, NULL, NULL, false); } static void @@ -283,6 +282,8 @@ i2c_tx_setup(void) DMA_CCR_PSIZE_8BITS | DMA_CCR_MSIZE_8BITS | DMA_CCR_PRIMED); + + stm32_dmastart(tx_dma, NULL, NULL, false); } static void |