raspi read test

sys/raspi_gpio/hal/raspi_gpio_hal.c

@@ -102,6 +102,7 @@ uint8_t u8x8_gpio_and_delay_raspi_gpio_hal(u8x8_t *u8x8, uint8_t msg, uint8_t ar
       break;							// arg_int=1: delay by 5us, arg_int = 4: delay by 1.25us        
     
     case U8X8_MSG_GPIO_MENU_SELECT:
+      /* read pin level: uint8_t bcm2835_gpio_lev(uint8_t pin); */
       u8x8_SetGPIOResult(u8x8, /* get menu select pin state */ 0);
       break;
     case U8X8_MSG_GPIO_MENU_NEXT:

sys/raspi_gpio/read_test/Makefile

@@ -0,0 +1,15 @@
+
+CFLAGS = -O -I../hal -I../../../csrc -DU8X8_USE_PINS -ffunction-sections -fdata-sections
+LDFLAGS = -Wl,--gc-sections
+
+SRC = $(wildcard *.c) $(wildcard ../hal/*.c) $(wildcard ../../../csrc/*.c)
+
+OBJ = $(SRC:.c=.o)
+
+
+main: $(OBJ) 
+	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) -o main
+
+clean:	
+	-rm $(OBJ) main
+

sys/raspi_gpio/read_test/main.c

@@ -0,0 +1,55 @@
+/*
+
+  main.c
+
+  raspberry pi zero GPIO read test
+
+  For speedup run this example as root, either wis
+    sudo ./main
+  or by setting the superuser bit:
+    sudo chown root:root ./main
+    sudo chmod u+s ./main
+
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <signal.h>
+#include "bcm2835.h"
+#include "raspi_gpio_hal.h"
+
+void sigtermhandler(int x)
+{
+  puts("SIGTERM");
+  bcm2835_close();
+}
+
+
+int main(void)
+{
+
+  if (!bcm2835_init())
+    exit(1);
+
+  signal(SIGTERM, sigtermhandler);
+
+  atexit((void (*) (void))bcm2835_close);
+
+  bcm2835_gpio_fsel(12, BCM2835_GPIO_FSEL_INPT);
+  bcm2835_gpio_fsel(13, BCM2835_GPIO_FSEL_INPT);
+  bcm2835_gpio_fsel(16, BCM2835_GPIO_FSEL_INPT);
+  bcm2835_gpio_fsel(17, BCM2835_GPIO_FSEL_INPT);
+  
+  for(;;)
+  {
+    
+    delaynanoseconds(1000000UL);
+    
+    printf("%d: %d  ", 12, bcm2835_gpio_lev(12));
+    printf("%d: %d  ", 13, bcm2835_gpio_lev(13));
+    printf("%d: %d  ", 16, bcm2835_gpio_lev(16));
+    printf("%d: %d  ", 17, bcm2835_gpio_lev(17));
+    puts("");
+    
+  }
+}