From 36928bb57ae74e96e7cd93edfd208d162e0592e1 Mon Sep 17 00:00:00 2001
From: Vegard Storheil Eriksen <zyp@jvnv.net>
Date: Sat, 8 Sep 2012 15:59:41 +0200
Subject: Led matrix test.

---
 main.cpp | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 main.cpp

(limited to 'main.cpp')

diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..eab4e69
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,89 @@
+#include <rcc/rcc.h>
+#include <gpio/pin.h>
+#include <spi/spi.h>
+#include <os/time.h>
+
+Pin& noe   = PA3;
+Pin& vsync = PA4;
+Pin& clk   = PA5; // SCK
+Pin& hsync = PA6; 
+Pin& data  = PA7; // MOSI
+
+inline void nopdelay(uint32_t iterations) {
+	while(iterations--) {
+		asm volatile("nop");
+	}
+}
+
+uint32_t buf[] = {
+	0b1001010100000000,
+	0b1001010100000000,
+	0b1111010100000000,
+	0b1001010000000000,
+	0b1001010100000000,
+	0b0000000000000000,
+	0b0000000000000000,
+	0b0000000000000000,
+	0b0000000000000000,
+	0b0000000000000000,
+	0b0000000000000000,
+	0b0000000000000000,
+	0b0000000000000000,
+	0b0000000000000000,
+	0b0000000000000000,
+	0b0000000000000000,
+};
+
+int main() {
+	// Initialize system timer.
+	STK.LOAD = 168000000 / 8 / 1000; // 1000 Hz.
+	STK.CTRL = 0x03;
+	
+	RCC.enable(RCC.GPIOA);
+	RCC.enable(RCC.SPI1);
+	
+	noe.set_mode(Pin::Output);
+	noe.off();
+	
+	hsync.set_mode(Pin::Output);
+	hsync.off();
+	
+	vsync.set_mode(Pin::Output);
+	vsync.on();
+	
+	clk.set_mode(Pin::AF);
+	clk.set_af(5);
+	
+	data.set_mode(Pin::AF);
+	data.set_af(5);
+	
+	SPI1.reg.CR1 = 0xbfc;
+	
+	uint32_t row = 0;
+	
+	while(1) {
+		// Shift out a row.
+		SPI1.reg.DR = buf[row];
+		while(!(SPI1.reg.SR & 0x01));
+		(void)SPI1.reg.DR;
+		
+		// Assert vsync if this is first row.
+		if(row == 0) {
+			vsync.off();
+		}
+		
+		// Strobe hsync.
+		hsync.on();
+		nopdelay(10);
+		hsync.off();
+		
+		// Deassert vsync.
+		if(row == 0) {
+			vsync.on();
+		}
+		
+		Time::sleep(1);
+		
+		row = (row + 1) & 0xf;
+	}
+}
-- 
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