From 7ca1a1009ba230b93dac43a62a46fdd985450366 Mon Sep 17 00:00:00 2001
From: asterix <asterix@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Thu, 15 Jul 2010 16:48:06 +0000
Subject: [PATCH] Add first implemtation of i2c for lpc23xx.

git-svn-id: https://src.develer.com/svnoss/bertos/branches/i2c@4031 38d2e660-2303-0410-9eaa-f027e97ec537
---
 bertos/cpu/arm/drv/i2c_lpc2.c | 189 ++++++++++++++++++++++++++++++++++
 1 file changed, 189 insertions(+)
 create mode 100644 bertos/cpu/arm/drv/i2c_lpc2.c

diff --git a/bertos/cpu/arm/drv/i2c_lpc2.c b/bertos/cpu/arm/drv/i2c_lpc2.c
new file mode 100644
index 00000000..9d68348a
--- /dev/null
+++ b/bertos/cpu/arm/drv/i2c_lpc2.c
@@ -0,0 +1,189 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Driver for the LPC23xx I2C (implementation)
+ *
+ */
+
+#include "cfg/cfg_i2c.h"
+
+#define LOG_LEVEL  I2C_LOG_LEVEL
+#define LOG_FORMAT I2C_LOG_FORMAT
+
+#include <cfg/log.h>
+
+#include <cfg/debug.h>
+#include <cfg/macros.h> // BV()
+#include <cfg/module.h>
+
+#include <cpu/detect.h>
+#include <cpu/irq.h>
+
+#include <drv/timer.h>
+#include <drv/i2c.h>
+#include <drv/vic_lpc2.h> /* vic_handler_t */
+
+#include <io/lpc23xx.h>
+
+
+/*
+ *
+ */
+#if 0
+	/* I2C 0 */
+	#define I2C                        I2C0_MASTER_BASE
+	#define SYSCTL_RCGC1_I2C           SYSCTL_RCGC1_I2C0
+	#define SYSCTL_RCGC2_GPIO          SYSCTL_RCGC2_GPIOB
+	#define GPIO_I2C_SCL_PIN           GPIO_I2C0_SCL_PIN
+	#define GPIO_I2C_SDA_PIN           GPIO_I2C0_SDA_PIN
+	#define GPIO_PORT_BASE             GPIO_PORTB_BASE
+#else
+	/* I2C 1 */
+	#define I2C                        I2C1_MASTER_BASE
+	#define SYSCTL_RCGC1_I2C           SYSCTL_RCGC1_I2C1
+	#define SYSCTL_RCGC2_GPIO          SYSCTL_RCGC2_GPIOA
+	#define GPIO_I2C_SCL_PIN           GPIO_I2C1_SCL_PIN
+	#define GPIO_I2C_SDA_PIN           GPIO_I2C1_SDA_PIN
+	#define GPIO_PORT_BASE             GPIO_PORTA_BASE
+#endif
+
+
+/**
+ * Send START condition and select slave for write.
+ * \c id is the device id comprehensive of address left shifted by 1.
+ * The LSB of \c id is ignored and reset to 0 for write operation.
+ *
+ * \return true on success, false otherwise.
+ */
+bool i2c_builtin_start_w(uint8_t id)
+{
+
+	return true;
+}
+
+
+/**
+ * Send START condition and select slave for read.
+ * \c id is the device id comprehensive of address left shifted by 1.
+ * The LSB of \c id is ignored and set to 1 for read operation.
+ *
+ * \return true on success, false otherwise.
+ */
+bool i2c_builtin_start_r(uint8_t id)
+{
+
+	return true;
+}
+
+
+void i2c_builtin_stop(void)
+{
+}
+
+
+bool i2c_builtin_put(const uint8_t data)
+{
+	(void)data;
+	return true;
+}
+
+
+int i2c_builtin_get(bool ack)
+{
+	(void)ack;
+	return 0;
+}
+
+/*
+ * With this function is allowed only the atomic write.
+ */
+bool i2c_send(const void *_buf, size_t count)
+{
+	const uint8_t *buf = (const uint8_t *)_buf;
+
+
+	return true;
+}
+
+/**
+ * In order to read bytes from the i2c we should make some tricks.
+ */
+bool i2c_recv(void *_buf, size_t count)
+{
+
+	return true;
+}
+
+MOD_DEFINE(i2c);
+
+#define I2C_PCONP             PCONP_PCI2C0
+#define I2C_CONSET            I20CONSET
+#define I2C_CONCLR            I20CONCLR
+#define I2C_SCLH              I20SCLH
+#define I2C_SCLL              I20SCLL
+
+
+/**
+ * Initialize I2C module.
+ */
+void i2c_builtin_init(void)
+{
+	PCONP |= BV(I2C_PCONP); // enable I2C0 clock
+
+	#if (CONFIG_I2C_FREQ > 400000)
+		#error i2c frequency is to hight.
+	#endif
+
+	I2C_CONCLR = BV(I2CON_I2ENC);
+
+	// Bit Frequency = Fplk / (I2C_I2SCLH + I2C_I2SCLL)
+	// value of I2SCLH and I2SCLL must be different
+
+	PCLKSEL0 |= I2C0_PCLK_DIV8;
+	I2C_SCLH = (((CPU_FREQ / 8) / CONFIG_I2C_FREQ) / 2) + 1;
+	I2C_SCLL = (((CPU_FREQ / 8) / CONFIG_I2C_FREQ) / 2);
+
+	ASSERT(I2C_SCLH > 4 || I2C_SCLL > 4);
+
+	//I2CState = I2C_IDLE;
+
+	// Assign pins to SCL and SDA (P0_27, P0_28)
+	PINSEL0 |= BV(27) | BV(28);
+
+	// Enable I2C
+	I2C_CONSET = BV(I2CON_I2EN);
+	I2C_CONCLR |= BV(I2CON_STAC) | BV(I2CON_SIC) | BV(I2CON_AAC);
+
+kprintf("h%ld l%ld\n", I2C_SCLH, I2C_SCLL);
+
+	MOD_INIT(i2c);
+}
-- 
2.25.1