Move all configuration variables to the EEPROM

eeprom_config/config_ft817.yaml

@@ -0,0 +1,35 @@
+# Values for the cooler of the FT-817 radio.
+flags:
+  USE_DCDC_CONTROL: true
+
+
+config:
+  # temperature corridor definition
+  CORRIDOR_MIN_TEMPERATURE:  40.0
+  CORRIDOR_MAX_TEMPERATURE:  45.0
+
+  # The fan is started when temperature rises above this temperature.
+  FAN_START_TEMPERATURE:     42.0
+
+  # The fan is stopped when the temperature falls below this point.
+  FAN_OFF_TEMPERATURE:       30.0
+
+  # Emergency temperature level. If this is reached, the duty cycle is directly
+  # set to the maximum to skip a long ramp-up phase.
+  EMERGENCY_TEMPERATURE:     60.0
+
+  # The fan PWM duty cycle cannot fall below this limit. It is held until
+  # temperature falls below the off-temperature.
+  DUTY_CYCLE_MIN:            30.0
+
+  # The fan PWM duty cycle cannot go above this limit. Should be set to 100.
+  DUTY_CYCLE_MAX:           100.0
+
+  # The fan is always started with this duty cycle. Do not set too low.
+  DUTY_CYCLE_START:          70.0
+
+  # gain unit: percent duty cycle change per °C deviation per update cycle (100 ms)
+  GAIN_T_HIGH_P:              2.000
+  GAIN_T_HIGH_I:              0.125
+  GAIN_T_LOW_P:               0.000
+  GAIN_T_LOW_I:               0.125

eeprom_config/config_to_hex.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+
+import sys
+import struct
+
+import yaml
+from intelhex import IntelHex
+
+
+def as_fxp(v):
+    return int(v * 2**16 + 0.5)
+
+BASE_ADDR = 0x08080000
+
+FLAG_NAME_TO_BIT_INDEX = {
+        'USE_DCDC_CONTROL':    0
+    }
+
+CONFIG_KEY_TO_OFFSET = {
+        # note: flags are at 0x0000, but not listed here due to special handling.
+        'CORRIDOR_MIN_TEMPERATURE': 0x0004,
+        'CORRIDOR_MAX_TEMPERATURE': 0x0008,
+        'FAN_START_TEMPERATURE':    0x000C,
+        'FAN_OFF_TEMPERATURE':      0x0010,
+        'EMERGENCY_TEMPERATURE':    0x0014,
+        'DUTY_CYCLE_MIN':           0x0018,
+        'DUTY_CYCLE_MAX':           0x001C,
+        'DUTY_CYCLE_START':         0x0020,
+        'GAIN_T_HIGH_P':            0x0024,
+        'GAIN_T_HIGH_I':            0x0028,
+        'GAIN_T_LOW_P':             0x002C,
+        'GAIN_T_LOW_I':             0x0030,
+    }
+
+
+if __name__ == "__main__":
+    output = IntelHex()
+
+    if len(sys.argv) < 3:
+        print(f"usage: {sys.argv[0]} <yaml-config> <output-hex>")
+        sys.exit(1)
+
+    with open(sys.argv[1], 'r') as configfile:
+        config = yaml.safe_load(configfile)
+
+    flags = 0
+    for key, bitidx in FLAG_NAME_TO_BIT_INDEX.items():
+        if config['flags'][key]:
+            flags |= (1 << bitidx)
+
+
+    enc_bytes = struct.pack('<I', flags)
+    output.puts(BASE_ADDR + 0x0000, enc_bytes)
+
+    for key, offset in CONFIG_KEY_TO_OFFSET.items():
+        value = as_fxp(config['config'][key])
+        enc_bytes = struct.pack('<i', value)
+        output.puts(BASE_ADDR + offset, enc_bytes)
+
+    output.write_hex_file(sys.argv[2])

eeprom_config/upload_config_hex.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+set -euo pipefail
+
+HEXFILE="$1"
+
+if [ ! -f "$HEXFILE" ]; then
+	echo "$HEXFILE cannot be accessed."
+	exit 1
+fi
+
+JLinkExe -device STM32L010K8 -speed 1000 -if SWD <<EOF
+connect
+loadfile $HEXFILE
+r
+g
+exit
+EOF

src/eeprom_config.h

@@ -0,0 +1,42 @@
+#ifndef EEPROM_CONFIG_H
+#define EEPROM_CONFIG_H
+
+#define EEPROM_BASE_ADDR ((uint8_t*)0x08080000)
+
+// boolean flags. Each bit represents one flag.
+#define EEPROM_CONFIG_FLAGS     (*(uint32_t*)(EEPROM_BASE_ADDR + 0x0000))
+
+// flag definitions
+#define EEPROM_CONFIG_FLAG_USE_DCDC_CONTROL  (1 << 0)
+
+// corridor definition
+#define EEPROM_CONFIG_CORRIDOR_MIN_TEMPERATURE     (*(fxp_t*)(EEPROM_BASE_ADDR + 0x0004))
+#define EEPROM_CONFIG_CORRIDOR_MAX_TEMPERATURE     (*(fxp_t*)(EEPROM_BASE_ADDR + 0x0008))
+
+// The fan is started when temperature rises above this temperature.
+#define EEPROM_CONFIG_FAN_START_TEMPERATURE        (*(fxp_t*)(EEPROM_BASE_ADDR + 0x000C))
+
+// The fan is stopped when the temperature falls below this point.
+#define EEPROM_CONFIG_FAN_OFF_TEMPERATURE          (*(fxp_t*)(EEPROM_BASE_ADDR + 0x0010))
+
+// Emergency temperature level. If this is reached, the duty cycle is directly
+// set to the maximum to skip a long ramp-up phase.
+#define EEPROM_CONFIG_EMERGENCY_TEMPERATURE        (*(fxp_t*)(EEPROM_BASE_ADDR + 0x0014))
+
+// The fan PWM duty cycle cannot fall below this limit. It is held until
+// temperature falls below the off-temperature.
+#define EEPROM_CONFIG_DUTY_CYCLE_MIN               (*(fxp_t*)(EEPROM_BASE_ADDR + 0x0018))
+
+// The fan PWM duty cycle cannot go above this limit. Should be set to 100.
+#define EEPROM_CONFIG_DUTY_CYCLE_MAX               (*(fxp_t*)(EEPROM_BASE_ADDR + 0x001C))
+
+// The fan is always started with this duty cycle. Do not set too low.
+#define EEPROM_CONFIG_DUTY_CYCLE_START             (*(fxp_t*)(EEPROM_BASE_ADDR + 0x0020))
+
+// gain unit: percent duty cycle change per °C deviation per update cycle
+#define EEPROM_CONFIG_GAIN_T_HIGH_P                (*(fxp_t*)(EEPROM_BASE_ADDR + 0x0024))
+#define EEPROM_CONFIG_GAIN_T_HIGH_I                (*(fxp_t*)(EEPROM_BASE_ADDR + 0x0028))
+#define EEPROM_CONFIG_GAIN_T_LOW_P                 (*(fxp_t*)(EEPROM_BASE_ADDR + 0x002C))
+#define EEPROM_CONFIG_GAIN_T_LOW_I                 (*(fxp_t*)(EEPROM_BASE_ADDR + 0x0030))
+
+#endif // EEPROM_CONFIG_H

src/fan_controller.c

@@ -1,5 +1,7 @@
 #include "fan_controller.h"
 
+#include "eeprom_config.h"
+
 /*
  * The control loop is based on a temperature corridor concept. While the
  * temperature is inside the corridor, the PWM duty cycle will not be changed.
@@ -26,35 +28,34 @@
  */
 
 // corridor definition
-#define CORRIDOR_MIN_TEMPERATURE     (40 << POINTPOS)
+#define CORRIDOR_MIN_TEMPERATURE     EEPROM_CONFIG_CORRIDOR_MIN_TEMPERATURE
-#define CORRIDOR_MAX_TEMPERATURE     (45 << POINTPOS)
+#define CORRIDOR_MAX_TEMPERATURE     EEPROM_CONFIG_CORRIDOR_MAX_TEMPERATURE
 
 // The fan is started when temperature rises above this temperature.
-#define FAN_START_TEMPERATURE        (42 << POINTPOS)
+#define FAN_START_TEMPERATURE        EEPROM_CONFIG_FAN_START_TEMPERATURE
 
 // The fan is stopped when the temperature falls below this point.
-#define FAN_OFF_TEMPERATURE          (30 << POINTPOS)
+#define FAN_OFF_TEMPERATURE          EEPROM_CONFIG_FAN_OFF_TEMPERATURE
 
 // Emergency temperature level. If this is reached, the duty cycle is directly
 // set to the maximum to skip a long ramp-up phase.
-#define EMERGENCY_TEMPERATURE        (60 << POINTPOS)
+#define EMERGENCY_TEMPERATURE        EEPROM_CONFIG_EMERGENCY_TEMPERATURE
 
 // The fan PWM duty cycle cannot fall below this limit. It is held until
 // temperature falls below the off-temperature.
-#define DUTY_CYCLE_MIN     (5 << POINTPOS)
+#define DUTY_CYCLE_MIN               EEPROM_CONFIG_DUTY_CYCLE_MIN
 
 // The fan PWM duty cycle cannot go above this limit. Should be set to 100.
-#define DUTY_CYCLE_MAX     (100 << POINTPOS)
+#define DUTY_CYCLE_MAX               EEPROM_CONFIG_DUTY_CYCLE_MAX
 
 // The fan is always started with this duty cycle. Do not set too low.
-#define DUTY_CYCLE_START   (20 << POINTPOS)
+#define DUTY_CYCLE_START             EEPROM_CONFIG_DUTY_CYCLE_START
 
 // gain unit: percent duty cycle change per °C deviation per update cycle
-#define GAIN_T_HIGH_P      0x00020000   // 2.000
+#define GAIN_T_HIGH_P                EEPROM_CONFIG_GAIN_T_HIGH_P
-#define GAIN_T_HIGH_I      0x00002000   // 0.125
+#define GAIN_T_HIGH_I                EEPROM_CONFIG_GAIN_T_HIGH_I
-#define GAIN_T_LOW_P       0x00000000   // 0.000
+#define GAIN_T_LOW_P                 EEPROM_CONFIG_GAIN_T_LOW_P
-#define GAIN_T_LOW_I       0x00002000   // 0.125
+#define GAIN_T_LOW_I                 EEPROM_CONFIG_GAIN_T_LOW_I
-//                 integer unit ^
 
 static fxp_t m_duty;
 

src/main.c

@@ -7,6 +7,7 @@
 #include "fan_ctrl_pwm.h"
 #include "fan_ctrl_dc.h"
 #include "fan_controller.h"
+#include "eeprom_config.h"
 
 #define SYSTICK_FREQ   10 // Hz
 
@@ -58,9 +59,8 @@ int main(void)
 
 	uart_enqueue("TinyFanControl v" VERSION " initialized.\n");
 
-	fan_ctrl_pwm_enable(); // TODO: make DC/PWM configurable
-
 	uint8_t last_duty = 0;
+	bool use_dcdc = EEPROM_CONFIG_FLAGS & EEPROM_CONFIG_FLAG_USE_DCDC_CONTROL;
 
 	while (1) {
 		if(systick_triggered) {
@@ -81,13 +81,25 @@ int main(void)
 
 			// handle fan power-on and power-off
 			if(last_duty == 0 && duty != 0) {
+				if(use_dcdc) {
+					fan_ctrl_dc_enable();
+				} else {
 					fan_ctrl_pwm_enable();
+				}
 			} else if(last_duty != 0 && duty == 0) {
+				if(use_dcdc) {
+					fan_ctrl_dc_disable();
+				} else {
 					fan_ctrl_pwm_disable();
 				}
+			}
 
 			// set the updated duty cycle
+			if(use_dcdc) {
+				fan_ctrl_dc_set_duty(duty);
+			} else {
 				fan_ctrl_pwm_set_duty(duty);
+			}
 
 			last_duty = duty;
 		}