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ad9910: tweak spi timing for higher speed

This commit is contained in:
Robert Jördens 2018-02-12 17:41:42 +00:00 committed by Robert Jordens
parent 6a6695924f
commit 7f1bfddeda
1 changed files with 3 additions and 3 deletions
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6
artiq/coredevice/ad9910.py
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@ -64,7 +64,7 @@ class AD9910:
def write32(self, addr, data): def write32(self, addr, data):
self.bus.set_xfer(self.chip_select, 8, 0) self.bus.set_xfer(self.chip_select, 8, 0)
self.bus.write(addr << 24) self.bus.write(addr << 24)
delay_mu(-self.bus.xfer_period_mu) delay_mu(-self.bus.xfer_period_mu + 8)
self.bus.set_xfer(self.chip_select, 32, 0) self.bus.set_xfer(self.chip_select, 32, 0)
self.bus.write(data) self.bus.write(data)
delay_mu(self.bus.xfer_period_mu - self.bus.write_period_mu) delay_mu(self.bus.xfer_period_mu - self.bus.write_period_mu)
@ -74,7 +74,7 @@ class AD9910:
self.bus.set_xfer(self.chip_select, 8, 0) self.bus.set_xfer(self.chip_select, 8, 0)
self.bus.write(addr << 24) self.bus.write(addr << 24)
t = self.bus.xfer_period_mu t = self.bus.xfer_period_mu
delay_mu(-t) delay_mu(-t + 8)
self.bus.set_xfer(self.chip_select, 32, 0) self.bus.set_xfer(self.chip_select, 32, 0)
self.bus.write(data_high) self.bus.write(data_high)
self.bus.write(data_low) self.bus.write(data_low)
@ -84,7 +84,7 @@ class AD9910:
def read32(self, addr): def read32(self, addr):
self.bus.set_xfer(self.chip_select, 8, 0) self.bus.set_xfer(self.chip_select, 8, 0)
self.bus.write((addr | 0x80) << 24) self.bus.write((addr | 0x80) << 24)
delay_mu(-self.bus.xfer_period_mu) delay_mu(-self.bus.xfer_period_mu + 8)
self.bus.set_xfer(self.chip_select, 0, 32) self.bus.set_xfer(self.chip_select, 0, 32)
self.bus.write(0) self.bus.write(0)
delay_mu(2*self.bus.xfer_period_mu) delay_mu(2*self.bus.xfer_period_mu)