added tec modulation

Examples/SD_Card/README.md

@@ -41,11 +41,15 @@ Additional profile-controlled devices:
 - `AD9102` waveform settings are stored through the `waveform_*` keys.
 - `AD9833` settings are stored through `ad9833_enable`, `ad9833_triangle`, and `ad9833_frequency_word`.
 - STM32 internal DAC settings are stored through `stm32_dac_enable` and `stm32_dac_code`.
+- TEC drive modulation is stored through `tec_modulation_enable`, `tec_modulation_laser`,
+  `tec_modulation_frequency_hz`, and `tec_modulation_amplitude_code`.
 - `DS1809` is stored as an absolute target above the minimum tap using `ds1809_apply` and `ds1809_position_from_min`.
 
 Notes:
 
 - `ad9833_frequency_word` uses the same raw 28-bit tuning word that the old serial command accepted.
+- `tec_modulation_laser` is `1` or `2`; accepted TEC modulation frequency is `50..2000 Hz`,
+  and peak amplitude is `0..4096` external TEC DAC codes.
 - `ds1809_position_from_min` is clamped to the valid `0..63` range by the firmware.
 - When `ds1809_apply=true`, the firmware first drives the potentiometer fully down and then steps it up to the requested absolute position.
 

Examples/SD_Card/profiles/PROF1.INI

@@ -43,5 +43,10 @@ ad9833_frequency_word=0
 stm32_dac_enable=0
 stm32_dac_code=0
 
+tec_modulation_enable=0
+tec_modulation_laser=1
+tec_modulation_frequency_hz=1000
+tec_modulation_amplitude_code=0
+
 ds1809_apply=true
 ds1809_position_from_min=0

Examples/SD_Card/profiles/PROF2.INI

@@ -47,5 +47,10 @@ ad9833_frequency_word=0x00123456
 stm32_dac_enable=1
 stm32_dac_code=2048
 
+tec_modulation_enable=0
+tec_modulation_laser=1
+tec_modulation_frequency_hz=1000
+tec_modulation_amplitude_code=0
+
 ds1809_apply=true
 ds1809_position_from_min=18