Add STM32F2 I2C support.

Untested, but fixes the build and at least provides the correct
register map and base pointers.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

2 files changed, 179 insertions, 0 deletions

diff --git a/libmaple/stm32f2/i2c.c b/libmaple/stm32f2/i2c.c
new file mode 100644
index 0000000..42fd427
--- /dev/null
+++ b/libmaple/stm32f2/i2c.c
@@ -0,0 +1,99 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2012 LeafLabs, LLC.
+ * Copyright (c) 2014 Google, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+#include "i2c_private.h"
+#include <libmaple/i2c.h>
+
+/*
+ * Devices
+ */
+
+static i2c_dev i2c1 = I2C_DEV_NEW(1, &gpiob, 7, &gpiob, 6);
+static i2c_dev i2c2 = I2C_DEV_NEW(1, &gpioh, 5, &gpioh, 4);
+static i2c_dev i2c3 = I2C_DEV_NEW(1, &gpioh, 8, &gpioh, 7);
+
+/** I2C1 device */
+i2c_dev* const I2C1 = &i2c1;
+/** I2C2 device */
+i2c_dev* const I2C2 = &i2c2;
+/** I2C3 device */
+i2c_dev* const I2C3 = &i2c3;
+
+/*
+ * libmaple routines
+ */
+
+#define I2C_MODEF_FLAGS (GPIO_MODEF_TYPE_OD | GPIO_MODEF_SPEED_HIGH | \
+                         GPIO_MODEF_PUPD_PU)
+
+void i2c_config_gpios(const i2c_dev *dev) {
+    /* Untested... */
+    gpio_set_modef(sda_port(dev), dev->sda_pin, GPIO_MODE_AF, I2C_MODEF_FLAGS);
+    gpio_set_modef(scl_port(dev), dev->scl_pin, GPIO_MODE_AF, I2C_MODEF_FLAGS);
+    gpio_set_af(sda_port(dev), dev->sda_pin, GPIO_AF_I2C);
+    gpio_set_af(scl_port(dev), dev->scl_pin, GPIO_AF_I2C);
+}
+
+void i2c_master_release_bus(const i2c_dev *dev) {
+    /* Untested... */
+    unsigned flags = (GPIO_MODEF_TYPE_OD | GPIO_MODEF_SPEED_HIGH |
+                      GPIO_MODEF_PUPD_PU);
+    gpio_write_bit(scl_port(dev), dev->scl_pin, 1);
+    gpio_write_bit(sda_port(dev), dev->sda_pin, 1);
+    gpio_set_modef(scl_port(dev), dev->scl_pin, GPIO_MODE_OUTPUT,
+                   I2C_MODEF_FLAGS);
+    gpio_set_modef(sda_port(dev), dev->sda_pin, GPIO_MODE_OUTPUT,
+                   I2C_MODEF_FLAGS);
+}
+
+/*
+ * IRQ Handlers
+ */
+
+void __irq_i2c1_ev(void) {
+   _i2c_irq_handler(I2C1);
+}
+
+void __irq_i2c2_ev(void) {
+   _i2c_irq_handler(I2C2);
+}
+
+void __irq_i2c3_ev(void) {
+   _i2c_irq_handler(I2C3);
+}
+
+void __irq_i2c1_er(void) {
+    _i2c_irq_error_handler(I2C1);
+}
+
+void __irq_i2c2_er(void) {
+    _i2c_irq_error_handler(I2C2);
+}
+
+void __irq_i2c3_er(void) {
+    _i2c_irq_error_handler(I2C3);
+}
diff --git a/libmaple/stm32f2/include/series/i2c.h b/libmaple/stm32f2/include/series/i2c.h
new file mode 100644
index 0000000..b231256
--- /dev/null
+++ b/libmaple/stm32f2/include/series/i2c.h
@@ -0,0 +1,80 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung (from <libmaple/i2c.h>).
+ * Copyright (c) 2012 LeafLabs, LLC.
+ * Copyright (c) 2014 Google, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+#ifndef _LIBMAPLE_STM32F2_I2C_H_
+#define _LIBMAPLE_STM32F2_I2C_H_
+
+#include <libmaple/i2c_common.h>
+#include <libmaple/stm32.h>
+
+/*
+ * Register maps
+ */
+
+/** I2C register map type */
+typedef struct i2c_reg_map {
+    __io uint32 CR1;            /**< Control register 1 */
+    __io uint32 CR2;            /**< Control register 2 */
+    __io uint32 OAR1;           /**< Own address register 1 */
+    __io uint32 OAR2;           /**< Own address register 2 */
+    __io uint32 DR;             /**< Data register */
+    __io uint32 SR1;            /**< Status register 1 */
+    __io uint32 SR2;            /**< Status register 2 */
+    __io uint32 CCR;            /**< Clock control register */
+    __io uint32 TRISE;          /**< TRISE (rise time) register */
+    __io uint32 FLTR;           /**< Noise filter register */
+} i2c_reg_map;
+
+/** I2C1 register map base pointer */
+#define I2C1_BASE               ((struct i2c_reg_map*)0x40005400)
+/** I2C2 register map base pointer */
+#define I2C2_BASE               ((struct i2c_reg_map*)0x40005800)
+/** I2C3 register map base pointer */
+#define I2C3_BASE               ((struct i2c_reg_map*)0x40005C00)
+
+/*
+ * Devices
+ */
+
+extern i2c_dev* const I2C1;
+extern i2c_dev* const I2C2;
+extern i2c_dev* const I2C3;
+
+/*
+ * For internal use
+ */
+
+static inline uint32 _i2c_bus_clk(i2c_dev *dev) {
+    /* All the I2C peripherals are on APB1 */
+    return STM32_PCLK1 / (1000 * 1000);
+}
+
+#undef _I2C_HAVE_IRQ_FIXUP
+#undef _I2C_HAVE_DEPRECATED_I2C_REMAP
+
+#endif  /* _LIBMAPLE_STM32F1_I2C_H_ */