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si5351c: Add control of MCU_CLKIN output.

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This commit is contained in:
Martin Ling 2026-05-19 16:57:30 +01:00
parent 9423133c4b
commit c2262ccda1
2 changed files with 50 additions and 2 deletions
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51
firmware/common/si5351c.c
View file

@ -54,6 +54,7 @@ si5351c_driver_t si5351c = {
si5351c_clk_t clk[8];
uint8_t clkout_id;
uint8_t mcu_clkin_id;
static bool input_initialized = false;
static si5351c_input_t active_input;
@ -364,6 +365,40 @@ void si5351c_clkout_enable(si5351c_driver_t* const drv, bool enable)
si5351c_enable_clock_outputs(drv);
}
void si5351c_mcu_clkin_enable(si5351c_driver_t* const drv, bool enable)
{
#ifdef IS_H1_R9
if (IS_H1_R9) {
/* MCU clock is shared with CLKOUT. */
si5351c_clkout_enable(drv, enable);
}
#endif
#ifdef IS_NOT_H1_R9
if (IS_NOT_H1_R9) {
clk[mcu_clkin_id].output_enable = enable;
clk[mcu_clkin_id].power_down = !enable;
/* Configure clock to 40MHz */
if (mcu_clkin_id >= 6) {
// MCU_CLKIN on CLK6 or CLK7, integer only MS.
si5351c_configure_multisynth(drv, mcu_clkin_id, 20, 0, 0, 0);
} else {
// MCU_CLKIN on CLK0 to CLK5, fractional-capable MS.
si5351c_configure_multisynth(
drv,
mcu_clkin_id,
20 * 128 - 512,
0,
1,
0);
}
si5351c_configure_clock_control(drv);
si5351c_enable_clock_outputs(drv);
}
#endif
}
void si5351c_init(si5351c_driver_t* const drv)
{
/* Read revision ID */
@ -434,6 +469,15 @@ void si5351c_init(si5351c_driver_t* const drv)
.drive = SI5351C_DRIVE_8MA,
};
si5351c_clk_t mcu_clkin = {
.output_enable = false,
.power_down = true,
.mode = SI5351C_MODE_INT,
.pll = SI5351C_PLL_A,
.source = SI5351C_SRC_MULTISYNTH_SELF,
.drive = SI5351C_DRIVE_2MA,
};
si5351c_clk_t powered_down = {
.output_enable = false,
.power_down = true,
@ -488,7 +532,8 @@ void si5351c_init(si5351c_driver_t* const drv)
/* CLK6: none */
clk[6] = powered_down;
/* CLK7: LPC43xx */
clk[7] = powered_down;
clk[7] = mcu_clkin;
mcu_clkin_id = 7;
#ifdef IS_H1_R9
if (IS_H1_R9) {
@ -511,6 +556,7 @@ void si5351c_init(si5351c_driver_t* const drv)
/* CLK2: CLKOUT/LPC4320 */
clk[2] = clkout;
clkout_id = 2;
mcu_clkin_id = 2;
/* Other outputs not present on Si5351A */
clk[3] = powered_down;
clk[4] = powered_down;
@ -569,7 +615,8 @@ void si5351c_init(si5351c_driver_t* const drv)
};
} else {
/* CLK2: MCU_CLK */
clk[2] = powered_down;
clk[2] = mcu_clkin;
mcu_clkin_id = 2;
}
}
#endif

1
firmware/common/si5351c.h
View file

@ -135,6 +135,7 @@ bool si5351c_clkin_signal_valid(si5351c_driver_t* const drv);
void si5351c_write_single(si5351c_driver_t* const drv, uint8_t reg, uint8_t val);
uint8_t si5351c_read_single(si5351c_driver_t* const drv, uint8_t reg);
void si5351c_clkout_enable(si5351c_driver_t* const drv, bool enable);
void si5351c_mcu_clkin_enable(si5351c_driver_t* const drv, bool enable);
void si5351c_init(si5351c_driver_t* const drv);
void si5351c_set_phase(
si5351c_driver_t* const drv,