minor mod for trackball

add read_adc to read temperature for thermal_printer

Code/devterm_keyboard/devterm_keyboard.ino

@@ -5,7 +5,7 @@
 
 #include <USBComposite.h>
 
-#define SER_NUM_STR "20210517"
+#define SER_NUM_STR "20210515"
 
 USBHID HID;
 DEVTERM dev_term;

Code/devterm_keyboard/trackball.h

@@ -5,9 +5,9 @@
 
 #include "keys_io_map.h"
 
-#define BOUNCE_INTERVAL       30
+#define BOUNCE_INTERVAL       100
-#define BASE_MOVE_PIXELS      5
+#define BASE_MOVE_PIXELS      3
-#define EXPONENTIAL_BOUND     15
+#define EXPONENTIAL_BOUND     10
 #define EXPONENTIAL_BASE      1.2
 
 #define BTN_PIN               KEY0

Code/thermal_printer/config.h

@@ -112,14 +112,15 @@
 #define BCoefficent       3950
 #define RthNominal        30000
 #define TempNominal       25 
-#define ADCResolution     4096
+#define ADCResolution     1024
 #define SeriesResistor    30000
-
 #define NumSamples        10
 
 #define KELVIN            1
 #define CELSIUS           0
 
+#define ADC_FILE "/sys/class/i2c-dev/i2c-1/device/1-0054/iio:device1/in_voltage_raw"
+
 #define HEAT_TIME 300 // heat time,better not greater than 1000,300-1000 0-f
 
 #define int16               uint16_t

Code/thermal_printer/printer.c

@@ -333,6 +333,26 @@ void print_dots_8bit(CONFIG*cfg,uint8_t *Array, uint8_t characters,uint8_t feed_
     return;
 }
 
+uint16_t read_adc() {
+  long ret;
+  char c[16];
+  FILE *fptr;
+  if ((fptr = fopen(ADC_FILE, "r")) == NULL) {
+    printf("Error! ADC File cannot be opened\n");
+    // Program exits if the file pointer returns NULL.
+    return 0;
+  }
+  fscanf(fptr, "%[^\n]", c);
+  //printf("Data from the file:\n%s", c);
+  fclose(fptr);
+
+  ret = strtol(c, NULL, 10);
+  //printf("the number ret %d\n",ret);
+
+  return (uint16_t)ret;
+}
+
+
 uint16_t temperature() {
   
   
@@ -344,7 +364,8 @@ uint16_t temperature() {
  
   while(Sample<=NumSamples)
   {
-      ADCSamples += analogRead(THERMISTORPIN);
+      //ADCSamples += analogRead(THERMISTORPIN); //stm32
+      ADCSamples += read_adc();
       Sample++;
   }
   //Thermistor Resistance at x Kelvin

Code/thermal_printer/printer.h

@@ -26,6 +26,7 @@ void print_dots_8bit_split(CONFIG*cfg,uint8_t *Array, uint8_t characters);
 
 void print_dots_8bit(CONFIG*cfg,uint8_t *Array, uint8_t characters,uint8_t feed_num);
 
+uint16_t read_adc();
 uint16_t temperature();
 
 uint8_t print_lines8(CONFIG*);