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Set Si5351C CLK7 output to drive LPC GP_CLKIN at 40MHz, so that activity (e.g. audio) on the LPC can be synchronized with the baseband sample rate.

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This commit is contained in:
Jared Boone
2013-12-31 20:09:44 -08:00
parent 0ddb4cb7f2
commit 7f35ceaff2
2 changed files with 6 additions and 5 deletions
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5
firmware/common/hackrf_core.c
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@ -319,9 +319,10 @@ void cpu_clock_init(void)
/* MS5/CLK5 is the source for the MAX2837 clock input. */
si5351c_configure_multisynth(5, 20*128-512, 0, 1, 0); /* 800/20 = 40MHz */
/* MS6/CLK6 is unused. */
/* MS7/CLK7 is the source for the LPC43xx microcontroller. */
//uint8_t ms7data[] = { 91, 40, 0x0 };
//si5351c_write(ms7data, sizeof(ms7data));
uint8_t ms7data[] = { 90, 255, 20, 0 };
si5351c_write(ms7data, sizeof(ms7data));
#endif
/* Set to 10 MHz, the common rate between Jellybean and Jawbreaker. */

6
firmware/common/si5351c.c
View File

@ -237,16 +237,16 @@ void si5351c_configure_clock_control()
,SI5351C_CLK_INT_MODE | SI5351C_CLK_PLL_SRC(SI5351C_CLK_PLL_SRC_A) | SI5351C_CLK_SRC(SI5351C_CLK_SRC_MULTISYNTH_SELF) | SI5351C_CLK_IDRV(SI5351C_CLK_IDRV_2MA)
,SI5351C_CLK_INT_MODE | SI5351C_CLK_PLL_SRC(SI5351C_CLK_PLL_SRC_A) | SI5351C_CLK_SRC(SI5351C_CLK_SRC_MULTISYNTH_SELF) | SI5351C_CLK_IDRV(SI5351C_CLK_IDRV_8MA)
,SI5351C_CLK_POWERDOWN | SI5351C_CLK_INT_MODE /*not connected, but: plla int mode*/
,SI5351C_CLK_POWERDOWN | SI5351C_CLK_INT_MODE /* pllb int mode*/| SI5351C_CLK_PLL_SRC(SI5351C_CLK_PLL_SRC_B) | SI5351C_CLK_SRC(SI5351C_CLK_SRC_MULTISYNTH_SELF) | SI5351C_CLK_IDRV(SI5351C_CLK_IDRV_8MA)
,SI5351C_CLK_INT_MODE | SI5351C_CLK_PLL_SRC(SI5351C_CLK_PLL_SRC_A) | SI5351C_CLK_SRC(SI5351C_CLK_SRC_MULTISYNTH_SELF) | SI5351C_CLK_IDRV(SI5351C_CLK_IDRV_8MA)
};
si5351c_write(data, sizeof(data));
}
#endif
/* Enable CLK outputs 0, 1, 2, 4, 5, ~7 only. */
/* Enable CLK outputs 0, 1, 2, 4, 5, 7 only. */
void si5351c_enable_clock_outputs()
{
uint8_t data[] = { 3, 0xC8 };
uint8_t data[] = { 3, 0x48 };
si5351c_write(data, sizeof(data));
}