Makefile, options, and lcd stuff

Makefile

@@ -1,20 +1,22 @@
 CC=clang
-CFLAGS=-std=c99 -g
+CFLAGS=-std=c99
 LD=clang
 LDFLAGS=-lgpio -lfigpar
-OBJS=main.o util.o lcd.o ths.o
-OUTFILE=rpi4b-temp-humidity
+SRCS=src/main.c src/util.c src/lcd.c src/ths.c
+PROG=rpi4b-temp-humidity
 
 .include "config.mk"
 
-${OUTFILE}: ${OBJS}
-	${LD} ${LDFLAGS} -o $@ ${OBJS}
+OBJS=${SRCS:C/^src/bin/:C/.c$/.o/}
+bin/${PROG}: ${OBJS}
+	${LD} ${LDFLAGS} -o ${@} ${OBJS}
 
 main.o util.o lcd.o ths.o: util.h
 main.o lcd.o: lcd.h
 main.o ths.o: ths.h
 
-.c.o:
+${OBJS}: ${.TARGET:C/^bin/src/:C/.o$/.c/}
+	@mkdir -p bin/
 	${CC} ${CFLAGS} -c\
 -DDEFAULT_CONFIG_PATH="\"${DEFAULT_CONFIG_PATH}\""\
 -DDEFAULT_GPIO_DEVICE="\"${DEFAULT_GPIO_DEVICE}\""\
@@ -23,10 +25,10 @@ main.o ths.o: ths.h
 -DDEFAULT_FAIL_KEY="\"${DEFAULT_FAIL_KEY}\""\
 -DDEFAULT_FAIL_LIMIT="${DEFAULT_FAIL_LIMIT}"\
 -DDEFAULT_LCD_VERSION="\"${DEFAULT_LCD_VERSION}\""\
-$<
+-o ${@} ${.ALLSRC}
 
 clean:
-	rm -f ${OUTFILE} ${OBJS}
+	rm -rf bin/
 
 .SUFFIXES: .c .o
 .PHONY: clean

config.mk

@@ -2,6 +2,7 @@ DEFAULT_CONFIG_PATH=config.conf
 DEFAULT_GPIO_DEVICE=/dev/gpioc0
 DEFAULT_TEMP_KEY=dev.gpioths.0.temperature
 DEFAULT_HUMID_KEY=dev.gpioths.0.humidity
-DEFAULT_FAIL_KEY=dev.gpioths.0.fails
+#DEFAULT_FAIL_KEY=dev.gpioths.0.fails
+DEFAULT_FAIL_KEY=
 DEFAULT_FAIL_LIMIT=5
 DEFAULT_LCD_VERSION=jp

src/lcd.c

@@ -61,7 +61,9 @@ LCD *lcd_open(gpio_handle_t handle, gpio_pin_t rs, gpio_pin_t rw, gpio_pin_t en,
     lcd->d5 = d5;
     lcd->d6 = d6;
     lcd->d7 = d7;
-    lcd_set_read(lcd, true, true);
+    gpio_pin_output(lcd->handle, lcd->rw);
+    gpio_pin_output(lcd->handle, lcd->en);
+    gpio_pin_output(lcd->handle, lcd->rs);
     lcd_clear(lcd);
     lcd_call(lcd, 0, 0, 0, 0, 1, 1, 1, 0, 0); // 5x8 font, 2 lines, 8bit
     lcd_entry_mode(lcd, LCD_INCREMENT, LCD_CURSOR_MOVE);

src/main.c

@@ -54,8 +54,11 @@ int main(int argc, char *const *argv) {
     lcd_display_control(lcd, LCD_CURSOR_BLINK, LCD_CURSOR_ON, LCD_DISPLAY_ON);
     THS *ths = ths_open(GLOBAL_OPTS.temp_key, GLOBAL_OPTS.humid_key,
                         GLOBAL_OPTS.fail_key);
+    if (!GLOBAL_OPTS.fail_key) {
+        warnx("it's probably a bad idea to not set fail_key");
+    }
     while (true) {
-        if (ths_read_fails(ths) > GLOBAL_OPTS.fail_limit) {
+        if (GLOBAL_OPTS.fail_key && ths_read_fails(ths) > GLOBAL_OPTS.fail_limit) {
             errx(1, "THS fail limit reached");
         }
         lcd_clear(lcd);
@@ -79,7 +82,7 @@ int main(int argc, char *const *argv) {
 }
 
 void print_help(const char *exec_name) {
-    printf("usage: %s [-h] [-v] [-s] [-f CONFIG_PATH]", exec_name);
+    printf("usage: %s [-h] [-v] [-s] [-f CONFIG_PATH]\n", exec_name);
 }
 
 void parse_arguments(int argc, char *const *argv) {
@@ -196,6 +199,15 @@ static int parse_str_callback(struct figpar_config *opt, uint32_t line,
     return 0;
 }
 
+static char *steal_opt_if_set(char *str) {
+    if (str && !*str) {
+        free(str);
+        return NULL;
+    }
+    return str;
+}
+
+
 #define REQUIRE_KEY(ind, name) if (entries[ind].type == FIGPAR_TYPE_NONE) {\
 errx(1, "%s must be specified", # name);\
 }
@@ -222,15 +234,15 @@ static void set_options_from_entries(struct figpar_config *entries,
     memcpy(GLOBAL_OPTS.data_pins, arr->arr, sizeof(uint32_t) * 8);
 
     entries[5].type = FIGPAR_TYPE_NONE;
-    GLOBAL_OPTS.temp_key = entries[5].value.str;
+    GLOBAL_OPTS.temp_key = steal_opt_if_set(entries[5].value.str);
     LOG_VERBOSE("Using temp_key: \"%s\"\n", GLOBAL_OPTS.temp_key);
 
     entries[6].type = FIGPAR_TYPE_NONE;
-    GLOBAL_OPTS.humid_key = entries[6].value.str;
+    GLOBAL_OPTS.humid_key = steal_opt_if_set(entries[6].value.str);
     LOG_VERBOSE("Using humid_key: \"%s\"\n", GLOBAL_OPTS.humid_key);
 
     entries[7].type = FIGPAR_TYPE_NONE;
-    GLOBAL_OPTS.fail_key = entries[7].value.str;
+    GLOBAL_OPTS.fail_key = steal_opt_if_set(entries[7].value.str);
     LOG_VERBOSE("Using fail_key: \"%s\"\n", GLOBAL_OPTS.fail_key);
 
     GLOBAL_OPTS.fail_limit = entries[8].value.u_num;