1 files changed, 91 insertions, 0 deletions
diff --git a/app/keypad.c b/app/keypad.c
new file mode 100644
index 0000000..daea5c7
--- /dev/null
+++ b/app/keypad.c
@@ -0,0 +1,91 @@
+#include "project.h"
+
+#define GPIO_CLOCK GPIOA
+#define GPIO_DATA GPIOB
+#define CLOCK 	GPIO5
+#define DATA	GPIO11
+
+#define KEYPAD_DELAY do { delay_us(1); } while (0)
+
+uint16_t keypad_read(void)
+{
+uint16_t ret=0;
+uint16_t c;
+
+/*Reset the state machine in the keypad */
+
+gpio_set (GPIO_DATA, DATA);
+KEYPAD_DELAY;
+gpio_clear (GPIO_DATA, DATA);
+KEYPAD_DELAY;
+gpio_set (GPIO_DATA, DATA);
+KEYPAD_DELAY;
+
+gpio_clear (GPIO_CLOCK, CLOCK);
+KEYPAD_DELAY;
+
+for (c=0x8000;c;c>>=1)
+{
+gpio_set (GPIO_CLOCK, CLOCK);
+KEYPAD_DELAY;
+if (!(gpio_get (GPIO_DATA, DATA) & DATA)) ret|=c;
+gpio_clear (GPIO_CLOCK, CLOCK);
+KEYPAD_DELAY;
+}
+
+gpio_set (GPIO_CLOCK, CLOCK);
+
+return ret;
+}
+
+static void
+keypad_scan (void)
+{
+
+  uint16_t v;
+  char buf[16];
+
+
+  v=keypad_read();
+
+  sprintf (buf, "%04x", v);
+  lcd_write (buf, 0, 1);
+
+
+}
+
+void
+keypad_tick (void)
+{
+  static int c;
+
+  c++;
+
+  if (c < 73)
+    return;
+
+  c = 0;
+
+
+  keypad_scan ();
+
+
+}
+
+
+
+
+
+
+void
+keypad_init (void)
+{
+
+  gpio_set_mode (GPIO_CLOCK, GPIO_MODE_OUTPUT_50_MHZ,
+                 GPIO_CNF_OUTPUT_OPENDRAIN, CLOCK);
+  gpio_set_mode (GPIO_DATA, GPIO_MODE_OUTPUT_50_MHZ,
+                 GPIO_CNF_OUTPUT_OPENDRAIN, DATA);
+
+
+
+}