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| author | Gregory Nutt <gnutt@nuttx.org> | 2013-11-21 14:47:37 -0600 |
|---|---|---|
| committer | Gregory Nutt <gnutt@nuttx.org> | 2013-11-21 14:47:37 -0600 |
| commit | 0911dcffadb5f2a40cd5b2e0304641a1a00381f0 (patch) | |
| tree | 28baefe83f29a28b1084e475c417631eee6e5ed1 /nuttx/configs/olimex-lpc-h3131 | |
| parent | c4a9ac4c31345c2a496447c7facd4febec515b12 (diff) | |
| download | px4-nuttx-0911dcffadb5f2a40cd5b2e0304641a1a00381f0.tar.gz px4-nuttx-0911dcffadb5f2a40cd5b2e0304641a1a00381f0.tar.bz2 px4-nuttx-0911dcffadb5f2a40cd5b2e0304641a1a00381f0.zip | |
LPC-H3131: SDRAM comments updated
Diffstat (limited to 'nuttx/configs/olimex-lpc-h3131')
| -rw-r--r-- | nuttx/configs/olimex-lpc-h3131/src/lpc31_mem.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/nuttx/configs/olimex-lpc-h3131/src/lpc31_mem.c b/nuttx/configs/olimex-lpc-h3131/src/lpc31_mem.c index 42715226d..389a62f4e 100644 --- a/nuttx/configs/olimex-lpc-h3131/src/lpc31_mem.c +++ b/nuttx/configs/olimex-lpc-h3131/src/lpc31_mem.c @@ -109,8 +109,10 @@ static uint32_t lpc31_ns2clk(uint32_t ns, uint32_t hclk2) { - /* Example: ns=80, hclk2=90000000 - * clocks = 80 * 90000000 / 1000000000 + 1 = 8 + /* delay (ns) * hclk (Hz) / scale (ns/sec) = cycles + * + * Example: ns=80, hclk2=90000000 + * clocks = 80 * 90000000 / 1000000000 + 1 = 8 (actual 7.2 cycles) */ uint64_t tmp = (uint64_t)ns * (uint64_t)hclk2 / 1000000000ull; |