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px4-firmware
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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.

This commit is contained in:
px4dev 2013-01-25 21:58:55 -08:00
parent 818e898a7e
commit 6c75c5909e
1 changed files with 4 additions and 3 deletions
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7
apps/px4io/i2c.c
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@ -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