Add 'raspberrypi' connection type to HD44780 driver (by P. Corner).

2013-01-27 11:44:42 +00:00
parent 48b1c1ee40
commit 96502bcfdf
8 changed files with 715 additions and 21 deletions
@@ -0,0 +1,36 @@
+#ifndef HD_LCDRPI_H
+#define HD_LCDRPI_H
+
+#include "lcd.h"		/* for Driver */
+
+/* initialize this particular driver */
+int hd_init_rpi(Driver *drvthis);
+
+/**
+ * rpi_gpio_map is addressed through the hd44780_private_data struct. Data
+ * stored here is used for mapping physical GPIO pins to BCM2835 gpio. */
+struct rpi_gpio_map {
+	int en;
+	int rs;
+	int d7;
+	int d6;
+	int d5;
+	int d4;
+};
+
+/** Peripheral base address of the BCM2835 */
+#define BCM2835_PERI_BASE       0x20000000
+/** GPIO register start address */
+#define GPIO_BASE               BCM2835_PERI_BASE + 0x200000
+/** Length of register space */
+#define GPIO_BLOCK_SIZE         180
+/** The Pi has 32 GPIO pins */
+#define GPIO_PINS               32
+
+
+/** Setup a GPIO pin as input */
+#define INP_GPIO(g) *(gpio_map+((g)/10)) &= ~(7<<(((g)%10)*3))
+/** Sets or clears a GPIO pin */
+#define SET_GPIO(g,a) *(gpio_map+((a)?7:10))=1<<((g)%32);
+
+#endif				// HD_LCDRPI_H