split of logical parts into separate files

1 files changed, 52 insertions, 0 deletions

diff --git a/multiplexer.h b/multiplexer.h
new file mode 100644
index 0000000..806ef19
--- /dev/null
+++ b/multiplexer.h
@@ -0,0 +1,52 @@
+//
+//  How to access GPIO registers from C-code on the Raspberry-Pi
+//  Example program
+//  15-January-2012
+//  Dom and Gert
+//  Revised: 15-Feb-2013
+
+#ifndef __arm__
+#define SKIP_GPIO
+#endif
+
+// Access from ARM Running Linux
+
+#define BCM2708_PERI_BASE        0x20000000
+#define GPIO_BASE                (BCM2708_PERI_BASE + 0x200000) /* GPIO controller */
+
+#define PAGE_SIZE (4*1024)
+#define BLOCK_SIZE (4*1024)
+
+#define SER_DAT_PIN   26
+#define SER_CLK_PIN   19
+#define GATE_PIN      13
+#define PAR_CLK_PIN    6
+#define SENSE_PIN      5
+
+int  mem_fd;
+void *gpio_map;
+
+typedef struct {
+   char buf[3][40];
+   int should_buf, is_buf, keep_running;
+} t_display_data;
+
+// I/O access
+volatile unsigned *gpio;
+
+// GPIO setup macros. Always use INP_GPIO(x) before using OUT_GPIO(x) or SET_GPIO_ALT(x,y)
+#define INP_GPIO(g) *(gpio+((g)/10)) &= ~(7<<(((g)%10)*3))
+#define OUT_GPIO(g) *(gpio+((g)/10)) |=  (1<<(((g)%10)*3))
+#define SET_GPIO_ALT(g,a) *(gpio+(((g)/10))) |= (((a)<=3?(a)+4:(a)==4?3:2)<<(((g)%10)*3))
+
+#define GPIO_SET *(gpio+7)  // sets   bits which are 1 ignores bits which are 0
+#define GPIO_CLR *(gpio+10) // clears bits which are 1 ignores bits which are 0
+#define GPIO_ALTER(a) *(gpio+(a==0?10:7))  // alters (a==0: clear, else: set)  bits which are 1 ignores bits which are 0
+
+#define GET_GPIO(g) (*(gpio+13)&(1<<g)) // 0 if LOW, (1<<g) if HIGH
+
+#define GPIO_PULL *(gpio+37) // Pull up/pull down
+#define GPIO_PULLCLK0 *(gpio+38) // Pull up/pull down clock
+
+void multiplexer_setup_root();
+pthread_t multiplexer_setup_non_root(t_display_data *display_data);