sweep feature added

laser_control/constants.py

@@ -17,6 +17,7 @@ SHORT_CONTROL_TOTAL_LENGTH = 10
 WAVE_DATA_TOTAL_LENGTH = 30
 PROFILE_SAVE_CONTROL_TOTAL_LENGTH = 30
 PROFILE_SAVE_DATA_TOTAL_LENGTH = 30
+SWEEP_CONTROL_TOTAL_LENGTH = 16
 SHORT_COMMAND_LENGTH = 2
 STATUS_RESPONSE_LENGTH = 2
 
@@ -35,6 +36,7 @@ CMD_AD9102_WAVE_CONTROL = 0xCCCC
 CMD_AD9102_WAVE_DATA = 0xDDDD
 CMD_PROFILE_SAVE_DATA = 0xEEEE
 CMD_TEC_MODULATION_CONTROL = 0xF0F0
+CMD_SWEEP_CONTROL = 0xF1F1
 
 # ---- Setup-word bit layout from firmware app_decode_work_packet()
 
@@ -106,6 +108,9 @@ STM32_DAC_FLAG_ENABLE = 0x0001
 TEC_MODULATION_FLAG_ENABLE = 0x0001
 TEC_MODULATION_FLAG_CHANNEL_2 = 0x0002
 
+SWEEP_FLAG_ENABLE = 0x0001
+SWEEP_FLAG_TARGET_STM32_DAC = 0x0002
+
 AD9102_WAVE_OPCODE_BEGIN = 0x0001
 AD9102_WAVE_OPCODE_COMMIT = 0x0002
 AD9102_WAVE_OPCODE_CANCEL = 0x0003
@@ -194,7 +199,14 @@ STM32_DAC_CODE_MAX = 4095
 TEC_MODULATION_FREQUENCY_MIN_HZ = 50
 TEC_MODULATION_FREQUENCY_MAX_HZ = 2_000
 TEC_MODULATION_AMPLITUDE_CODE_MIN = 0
-TEC_MODULATION_AMPLITUDE_CODE_MAX = 4_096
+TEC_MODULATION_AMPLITUDE_CODE_MAX = 27_900  # Half of the firmware TEC drive range 1000..56800.
+
+# Firmware sweep tick: step periods are rounded down to a multiple of it.
+SWEEP_TICK_US = 10
+SWEEP_STEP_PERIOD_MIN_US = 20
+SWEEP_STEP_PERIOD_MAX_US = 65_530
+SWEEP_PAUSE_MAX_MS = 65_535
+SWEEP_CURRENT_STEP_MIN_MA = 0.002  # One laser DAC code is ~0.001 mA.
 
 # ---- Rail tolerances
 
@@ -232,6 +244,12 @@ DEFAULT_STM32_DAC_CODE = round(
 )
 DEFAULT_TEC_MODULATION_FREQUENCY_HZ = 1_000
 DEFAULT_TEC_MODULATION_AMPLITUDE_CODE = 256
+DEFAULT_SWEEP_CURRENT_MIN_MA = 30.0
+DEFAULT_SWEEP_CURRENT_MAX_MA = 40.0
+DEFAULT_SWEEP_CURRENT_STEP_MA = 0.05
+DEFAULT_SWEEP_DAC_STEP_CODE = 16
+DEFAULT_SWEEP_STEP_PERIOD_US = 50
+DEFAULT_SWEEP_PAUSE_MS = 5
 
 DEFAULT_PI_P = 2560
 DEFAULT_PI_I = 128