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Fix audio codec I2C reliability for some HackRF units.

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This commit is contained in:
Jared Boone 2016-04-26 13:06:46 -07:00
parent ed3ac5249f
commit 0662196905
1 changed files with 16 additions and 2 deletions
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18
firmware/application/portapack.cpp
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@ -106,9 +106,23 @@ void init() {
} }
/* Configure other pins */ /* Configure other pins */
/* Glitch filter operates at 3ns instead of 50ns due to the WM8731
* returning an ACK very fast (170ns) and confusing the I2C state
* machine into thinking there was a bus error. It looks like the
* MCU sees SDA fall before SCL falls, indicating a START at the
* point an ACK is expected. With the glitch filter off or set to
* 3ns, it's probably still a bit tight timing-wise, but improves
* reliability on some problem units.
*/
LPC_SCU->SFSI2C0 = LPC_SCU->SFSI2C0 =
(1U << 3) (1U << 0) // SCL: 3ns glitch
| (1U << 11) | (0U << 2) // SCL: Standard/Fast mode
| (1U << 3) // SCL: Input enabled
| (0U << 7) // SCL: Enable input glitch filter
| (1U << 8) // SDA: 3ns glitch
| (0U << 10) // SDA: Standard/Fast mode
| (1U << 11) // SDA: Input enabled
| (0U << 15) // SDA: Enable input glitch filter
; ;
power.init(); power.init();