From d3f4085123017c4ddf84c17251c3c847531cfb45 Mon Sep 17 00:00:00 2001
From: Neil Gershenfeld <gersh@cba.mit.edu>
Date: Sat, 19 Dec 2020 16:54:52 -0500
Subject: [PATCH] wip
---
GPIO/bcm2835/ring.bcm2835.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
create mode 100644 GPIO/bcm2835/ring.bcm2835.c
diff --git a/GPIO/bcm2835/ring.bcm2835.c b/GPIO/bcm2835/ring.bcm2835.c
new file mode 100644
index 0000000..c7941a8
--- /dev/null
+++ b/GPIO/bcm2835/ring.bcm2835.c
@@ -0,0 +1,30 @@
+//
+// ring.bcm2835.c
+//
+// bcm2835 ring oscillator test
+// gcc ring.bcm2835.c -o ring.bcm2835 -l bcm2835
+//
+// Neil Gershenfeld 12/19/20
+//
+// This work may be reproduced, modified, distributed,
+// performed, and displayed for any purpose, but must
+// acknowledge this project. Copyright is retained and
+// must be preserved. The work is provided as is; no
+// warranty is provided, and users accept all liability.
+//
+//
+#include <bcm2835.h>
+#include <stdio.h>
+#define pinout RPI_GPIO_P1_16
+#define pinin RPI_GPIO_P1_18
+int main(int argc,char **argv) {
+ bcm2835_init();
+ bcm2835_gpio_fsel(pinout,BCM2835_GPIO_FSEL_OUTP);
+ bcm2835_gpio_fsel(pinin,BCM2835_GPIO_FSEL_INPT);
+ while (1) {
+ if (bcm2835_gpio_lev(pinin) == LOW)
+ bcm2835_gpio_write(pinout,HIGH);
+ else
+ bcm2835_gpio_write(pinout,LOW);
+ }
+ }
--
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