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Add comment describing SWITCHCTRL pins vs. RF path configurations.

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This commit is contained in:
Jared Boone
2013-09-07 20:21:43 -07:00
parent d65314db37
commit e7c6408473
1 changed files with 17 additions and 0 deletions
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17
firmware/hackrf_usb/hackrf_usb.c
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@ -86,6 +86,23 @@ set_sample_r_params_t set_sample_r_params;
#define SWITCHCTRL_HP (1 << 4) /* GPO5 1 for high-pass, 0 for low-pass */
#define SWITCHCTRL_NO_RX_AMP_PWR (1 << 5) /* GPO6 turn off RX amp power */
/*
GPO6 GPO5 GPO4 GPO3 GPO2 GPO1
!RXAMP HP MIXBP TX AMPBP !TXAMP Mix mode Amp mode
1 X 1 1 1 1 TX bypass Bypass
1 X 1 1 0 0 TX bypass TX amplified
1 1 0 1 1 1 TX high Bypass
1 1 0 1 0 0 TX high TX amplified
1 0 0 1 1 1 TX low Bypass
1 0 0 1 0 0 TX low TX amplified
1 X 1 0 1 1 RX bypass Bypass
0 X 1 0 0 1 RX bypass RX amplified
1 1 0 0 1 1 RX high Bypass
0 1 0 0 0 1 RX high RX amplified
1 0 0 0 1 1 RX low Bypass
0 0 0 0 0 1 RX low RX amplified
*/
/*
* Safe (initial) switch settings turn off both amplifiers and enable both amp
* bypass and mixer bypass.