From 09e89c867c8dc14adee298176a0a4c72d8f32245 Mon Sep 17 00:00:00 2001
From: Vegard Storheil Eriksen <zyp@jvnv.net>
Date: Tue, 7 Aug 2012 16:54:36 +0200
Subject: Split out reusable parts into the laks project.

---
 hal/i2c.cpp | 142 ------------------------------------------------------------
 1 file changed, 142 deletions(-)
 delete mode 100644 hal/i2c.cpp

(limited to 'hal/i2c.cpp')

diff --git a/hal/i2c.cpp b/hal/i2c.cpp
deleted file mode 100644
index db9c919..0000000
--- a/hal/i2c.cpp
+++ /dev/null
@@ -1,142 +0,0 @@
-#include "i2c.h"
-
-#include "rcc.h"
-#include "thread.h"
-
-#if defined(STM32F1)
-I2C_t I2C1(0x40005400, 36000000, Interrupt::I2C1_EV, Interrupt::I2C1_ER);
-I2C_t I2C2(0x40005800, 36000000, Interrupt::I2C2_EV, Interrupt::I2C2_ER);
-#elif defined(STM32F4)
-I2C_t I2C1(0x40005400, 42000000, Interrupt::I2C1_EV, Interrupt::I2C1_ER);
-I2C_t I2C2(0x40005800, 42000000, Interrupt::I2C2_EV, Interrupt::I2C2_ER);
-//I2C_t I2C3(0x40005c00, 42000000, Interrupt::I2C3_EV, Interrupt::I2C3_ER);
-#endif
-
-void I2C_t::irq_ev() {
-	uint32_t sr1 = reg.SR1;
-	reg.SR2;
-	
-	// EV5, SB = 1: Start condition sent.
-	if(sr1 & 0x01) {
-		// Send address.
-		reg.DR = (addr << 1) | (writing ? 0 : 1);
-	}
-	
-	// EV6, ADDR = 1: Address sent.
-	if(sr1 & 0x02) {
-		if(writing) {
-			reg.DR = *write_p++;
-			writing--;
-		} else {
-			if(reading > 1) {
-				reg.CR1 |= 0x400; // Set ACK.
-			} else {
-				reg.CR1 |= 0x200; // Set STOP.
-			}
-		}
-	}
-	
-	// EV7, RxNE = 1: Receive buffer not empty.
-	if(sr1 & 0x40) {
-		*read_p++ = reg.DR;
-		reading--;
-		
-		if(reading == 1) {
-			// Unset ACK, set STOP.
-			reg.CR1 = (reg.CR1 & ~0x400) | 0x200;
-		}
-		
-		if(reading == 0) {
-			busy = 0;
-		}
-	}
-	
-	//reg.CR1 &= ~0x400;
-	
-	// EV8, TxE = 1, BTF = 0: Transmit buffer empty, still writing.
-	if(sr1 & 0x80 && !(sr1 & 0x04)) {
-		if(writing) {
-			// Send data.
-			reg.DR = *write_p++;
-			writing--;
-		} else {
-			// All data sent.
-			
-			if(reading) {
-				// Send repeat start.
-				reg.CR1 |= 0x100;
-			} else {
-				// Send stop.
-				reg.CR1 |= 0x200;
-				busy = 0;
-			}
-		}
-	}
-}
-
-void I2C_t::irq_er() {
-	handle_error();
-}
-
-void I2C_t::handle_error() {
-	reg.SR1;
-	reg.SR2;
-	
-	//while(1);
-	reg.CR1 |= 0x200;
-	busy = 0;
-}
-
-void I2C_t::enable(Pin& scl, Pin& sda) {
-	RCC.enable(RCC.I2C1);
-	asm volatile("nop");
-	
-	scl.set_af(4);
-	sda.set_af(4);
-	scl.set_type(Pin::OpenDrain);
-	sda.set_type(Pin::OpenDrain);
-	scl.set_mode(Pin::AF);
-	sda.set_mode(Pin::AF);
-	
-	reg.CR1 = 0x8000;
-	reg.CR1 = 0;
-	
-	reg.CR2 = 0x700 | (clk / 1000000);
-	reg.TRISE = clk / 1000000 + 1;
-	reg.CCR = clk / 2 / 100000;
-	
-	Interrupt::enable(irq_ev_n, &I2C_t::irq_ev, this);
-	Interrupt::enable(irq_er_n, &I2C_t::irq_er, this);
-	
-	reg.CR1 = 1;
-}
-
-void I2C_t::write_reg(uint8_t addr_, uint8_t reg_, uint8_t data) {
-	addr = addr_;
-	writing = 2;
-	reading = 0;
-	volatile uint8_t buf[] = {reg_, data};
-	write_p = buf;
-	busy = 1;
-	
-	reg.CR1 |= 0x100;
-	
-	while(busy) {
-		Thread::yield();
-	}
-}
-
-void I2C_t::read_reg(uint8_t addr_, uint8_t reg_, uint8_t len, uint8_t* buf) {
-	addr = addr_;
-	writing = 1;
-	reading = len;
-	write_p = &reg_;
-	read_p = buf;
-	busy = 1;
-	
-	reg.CR1 |= 0x100;
-	
-	while(busy) {
-		Thread::yield();
-	}
-}
-- 
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