diff options
| author | Keith Packard <keithp@keithp.com> | 2011-11-12 18:31:46 -0800 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-11-12 18:31:46 -0800 |
| commit | 0a705b62829d492e3a48c81077907cee61afb860 (patch) | |
| tree | 3d0baec85d9e45db55ed1404639b2c1054091059 /src | |
| parent | 4de8bf6da4d725bb0514d032b0708c5cf420e8fa (diff) | |
altos: Initialize DMA config address at boot time
Instead of resetting these each time a transfer is started, just set
them once at boot time.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/cc1111/ao_dma.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/src/cc1111/ao_dma.c b/src/cc1111/ao_dma.c index 6052964a..ca33facb 100644 --- a/src/cc1111/ao_dma.c +++ b/src/cc1111/ao_dma.c @@ -46,6 +46,10 @@ ao_dma_alloc(__xdata uint8_t *done) DMAIRQ = 0; DMAIF = 0; IEN1 |= IEN1_DMAIE; + DMA0CFGH = ((uint16_t) (&ao_dma_config[0])) >> 8; + DMA0CFGL = ((uint16_t) (&ao_dma_config[0])); + DMA1CFGH = ((uint16_t) (&ao_dma_config[1])) >> 8; + DMA1CFGL = ((uint16_t) (&ao_dma_config[1])); } return id; @@ -69,13 +73,6 @@ ao_dma_set_transfer(uint8_t id, ao_dma_config[id].len_low = count; ao_dma_config[id].cfg0 = cfg0; ao_dma_config[id].cfg1 = cfg1 | DMA_CFG1_IRQMASK; - if (id == 0) { - DMA0CFGH = ((uint16_t) (&ao_dma_config[0])) >> 8; - DMA0CFGL = ((uint16_t) (&ao_dma_config[0])); - } else { - DMA1CFGH = ((uint16_t) (&ao_dma_config[1])) >> 8; - DMA1CFGL = ((uint16_t) (&ao_dma_config[1])); - } } #define nop() _asm nop _endasm; @@ -85,9 +82,11 @@ ao_dma_start(uint8_t id) { uint8_t mask = (1 << id); DMAIRQ &= ~mask; - DMAARM = 0x80 | mask; - nop(); nop(); nop(); nop(); - nop(); nop(); nop(); nop(); + if (DMAARM & mask) { + DMAARM = 0x80 | mask; + nop(); nop(); nop(); nop(); + nop(); nop(); nop(); nop(); + } *(ao_dma_done[id]) = 0; DMAARM = mask; nop(); nop(); nop(); nop(); |