Used for testing matrices

docs/05blocks/code/rgb_white.c

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+// This code drives the RGB LED Matrix
+// Turns all the LEDs on
+#include <stdint.h>
+#include <pru_cfg.h>
+#include "resource_table_empty.h"
+#include "rgb_pocket.h"
+
+#define GPIO0	0x44e07000		// GPIO Bank 0  See Table 2.2 of TRM
+#define GPIO1	0x4804c000		// GPIO Bank 1
+#define GPIO2	0x481ac000		// GPIO Bank 2
+#define GPIO3	0x481ae000		// GPIO Bank 3
+#define GPIO_CLEARDATAOUT	0x190	// For clearing the GPIO registers
+#define GPIO_SETDATAOUT		0x194	// For setting the GPIO registers
+#define GPIO_DATAOUT		0x138	// For reading the GPIO registers
+
+#define DELAY 10	// Number of cycles (5ns each) to wait after a write
+
+volatile register uint32_t __R30;
+volatile register uint32_t __R31;
+
+void main(void)
+{
+	// Set up the pointers to each of the GPIO ports 
+	uint32_t *gpio[] = {
+			(uint32_t *) GPIO0, 
+			(uint32_t *) GPIO1, 
+			(uint32_t *) GPIO2, 
+			(uint32_t *) GPIO3
+		};
+
+	uint32_t i, row;
+
+	while(1) {
+	    for(row=0; row<16; row++) {
+	    	// Set the row address
+			// Here we take advantage of the select bits (LA,LB,LC,LD)
+			// being sequential in the R30 register (bits 2,3,4,5)
+			// We shift row over so it lines up with the select bits
+			// Oring (|=) with R30 sets bits to 1 and
+			// Anding (&=) clears bits to 0, the 0xffc mask makes sure the
+			// other bits aren't changed.
+	        __R30 |=  row<<pru_sel0;
+	        __R30 &= (row<<pru_sel0)|0xffc3;
+
+    	    for(i=0; i<64; i++) {
+    	    	// Top row white
+    	    	// Combining these to one write works because they are all in 
+    	    	// the same gpio port
+    	      	gpio[r11_gpio][GPIO_SETDATAOUT/4] = (0x1<<r11_pin)
+    	      			|(0x1<<g11_pin)|(0x1<<b11_pin);
+    	    	__delay_cycles(DELAY);;
+
+    	      	// Bottom row white
+    	      	gpio[r12_gpio][GPIO_SETDATAOUT/4] = (0x1<<r12_pin)
+    	      			|(0x1<<g12_pin)|(0x1<<b12_pin);
+    	    	__delay_cycles(DELAY);
+
+                __R30 |=  (0x1<<pru_clock);	// Toggle clock
+    	    	__delay_cycles(DELAY);
+        		__R30 &= ~(0x1<<pru_clock);
+    	    	__delay_cycles(DELAY);
+    	    }
+    	    __R30 |=  (0x1<<pru_oe);        // Disable display
+    	   	__delay_cycles(DELAY);
+    	    __R30 |=  (0x1<<pru_latch);     // Toggle latch
+    	   	__delay_cycles(DELAY);
+    	    __R30 &= ~(0x1<<pru_latch);
+    	   	__delay_cycles(DELAY);
+    	    __R30 &= ~(0x1<<pru_oe);        // Enable display
+    	    __delay_cycles(DELAY);
+	    }
+	}
+}