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LPC-H3131: SDRAM comments updated

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This commit is contained in:
Gregory Nutt 2013-11-21 14:47:37 -06:00
parent 37591022ca
commit c282733058
1 changed files with 4 additions and 2 deletions
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6
configs/olimex-lpc-h3131/src/lpc31_mem.c
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@ -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;