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DMA: speed up playback 

Time reduced from 1.53µs to 1.37µs.
This commit is contained in:
Sebastien Bourdeauducq 2017-04-19 10:59:12 +08:00
parent 41c4de4556
commit e8f7f8ef9c
2 changed files with 16 additions and 14 deletions
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2
artiq/firmware/ksupport/lib.rs
View File

@ -398,6 +398,7 @@ extern fn dma_playback(timestamp: i64, ptr: i32) {
csr::cri_con::selected_write(0); csr::cri_con::selected_write(0);
let status = csr::rtio_dma::error_status_read(); let status = csr::rtio_dma::error_status_read();
if status != 0 {
let timestamp = csr::rtio_dma::error_timestamp_read(); let timestamp = csr::rtio_dma::error_timestamp_read();
let channel = csr::rtio_dma::error_channel_read(); let channel = csr::rtio_dma::error_channel_read();
if status & rtio::RTIO_O_STATUS_UNDERFLOW != 0 { if status & rtio::RTIO_O_STATUS_UNDERFLOW != 0 {
@ -413,6 +414,7 @@ extern fn dma_playback(timestamp: i64, ptr: i32) {
timestamp as i64, channel as i64, 0) timestamp as i64, channel as i64, 0)
} }
} }
}
} }
unsafe fn attribute_writeback(typeinfo: *const ()) { unsafe fn attribute_writeback(typeinfo: *const ()) {

2
artiq/test/coredevice/test_rtio.py
View File

@ -605,7 +605,7 @@ class DMATest(ExperimentCase):
exp.playback_many(count) exp.playback_many(count)
dt = self.dataset_mgr.get("dma_playback_time") dt = self.dataset_mgr.get("dma_playback_time")
print("dt={}, dt/count={}".format(dt, dt/count)) print("dt={}, dt/count={}".format(dt, dt/count))
self.assertLess(dt/count, 7*us) self.assertLess(dt/count, 3*us)
def test_handle_invalidation(self): def test_handle_invalidation(self):
exp = self.create(_DMA) exp = self.create(_DMA)