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asix-sigma: Document sampling rate table 

Add comments to the sampling rate table explaining how the frequencies
are selected and where do those numbers come from.

Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Marek Vasut 2014-04-20 16:53:13 +02:00 committed by Bert Vermeulen
parent 6868626bd3
commit b1648dea88
1 changed files with 16 additions and 10 deletions
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26
hardware/asix-sigma/asix-sigma.c
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@ -43,17 +43,23 @@ SR_PRIV struct sr_dev_driver asix_sigma_driver_info;
static struct sr_dev_driver *di = &asix_sigma_driver_info;
static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
/*
* The ASIX Sigma supports arbitrary integer frequency divider in
* the 50MHz mode. The divider is in range 1...256 , allowing for
* very precise sampling rate selection. This driver supports only
* a subset of the sampling rates.
*/
static const uint64_t samplerates[] = {
SR_KHZ(200),
SR_KHZ(250),
SR_KHZ(500),
SR_MHZ(1),
SR_MHZ(5),
SR_MHZ(10),
SR_MHZ(25),
SR_MHZ(50),
SR_MHZ(100),
SR_MHZ(200),
SR_KHZ(200), /* div=250 */
SR_KHZ(250), /* div=200 */
SR_KHZ(500), /* div=100 */
SR_MHZ(1), /* div=50 */
SR_MHZ(5), /* div=10 */
SR_MHZ(10), /* div=5 */
SR_MHZ(25), /* div=2 */
SR_MHZ(50), /* div=1 */
SR_MHZ(100), /* Special FW needed */
SR_MHZ(200), /* Special FW needed */
};
/*