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authorlibdlo <libdlo@displaylink.com>2009-06-14 01:37:56 (GMT)
committerlibdlo <libdlo@displaylink.com>2009-06-14 01:37:56 (GMT)
commitd6322da0b2277bb5fa1615832529ead179aa51cf (patch)
tree0a78d2e2118e6d6a9df7dcdaaaf8dd4c2e2ad5cb
parentfa04eed0f8d6f86ba4569396ebd7d0eec6def4d2 (diff)
Clean up lsfr16 to not use static local var, etc.
-rw-r--r--src/dlo_mode.c15
1 files changed, 5 insertions, 10 deletions
diff --git a/src/dlo_mode.c b/src/dlo_mode.c
index c0eb1be..b341557 100644
--- a/src/dlo_mode.c
+++ b/src/dlo_mode.c
@@ -566,19 +566,14 @@ static dlo_modenum_t get_mode_number(dlo_device_t * const dev, const uint16_t wi
* (which is why it doesn't apply to all registers). It's actually
* for convenience on the hardware side, as the registers are used as counters
*/
-static uint32_t lfsr16(uint32_t v)
+static uint16_t lfsr16(uint16_t v)
{
- static uint32_t prev = 0;
- static uint32_t _v = 0xFFFF;
+ uint32_t _v = 0xFFFF;
- if (v != prev)
- {
- _v = 0xFFFF;
- while (v--)
- _v = ((_v << 1) | (((_v >> 15) ^ (_v >> 4) ^ (_v >> 2) ^ (_v >> 1)) & 1)) & 0xFFFF;
- prev = v;
+ while (v--) {
+ _v = ((_v << 1) | (((_v >> 15) ^ (_v >> 4) ^ (_v >> 2) ^ (_v >> 1)) & 1)) & 0xFFFF;
}
- return _v;
+ return (uint16_t) _v;
}
inline dlo_retcode_t vreg_big_endian(dlo_device_t * const dev, uint8_t reg, uint16_t val){