Merge branch 'i2c-wip' into refactor

Conflicts:
	examples/test-fsmc.cpp
	libmaple/rules.mk
	wirish/boards.h

1 files changed, 259 insertions, 0 deletions

diff --git a/libmaple/i2c.h b/libmaple/i2c.h
new file mode 100644
index 0000000..21c17c1
--- /dev/null
+++ b/libmaple/i2c.h
@@ -0,0 +1,259 @@
+/* *****************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * 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.
+ * ****************************************************************************/
+
+/**
+ *  @brief libmaple i2c header
+ */
+
+#ifndef _I2C_H_
+#define _I2C_H_
+
+typedef struct i2c_reg_map {
+    __io uint32 CR1;
+    __io uint32 CR2;
+    __io uint32 OAR1;
+    __io uint32 OAR2;
+    __io uint32 DR;
+    __io uint32 SR1;
+    __io uint32 SR2;
+    __io uint32 CCR;
+    __io uint32 TRISE;
+} i2c_reg_map;
+
+typedef enum i2c_state {
+    I2C_STATE_IDLE,
+    I2C_STATE_XFER_DONE,
+    I2C_STATE_BUSY,
+    I2C_STATE_ERROR             = -1
+} i2c_state;
+
+typedef struct i2c_msg {
+    uint16 addr;
+#define I2C_MSG_READ            0x1
+#define I2C_MSG_10BIT_ADDR      0x2
+    uint16 flags;
+    uint16 length;
+    uint16 xferred;
+    uint8 *data;
+} i2c_msg;
+
+typedef struct i2c_dev {
+    i2c_reg_map *regs;
+    gpio_dev *gpio_port;
+    uint8 sda_pin;
+    uint8 scl_pin;
+    uint8 clk_line;
+    uint8 ev_nvic_line;
+    uint8 er_nvic_line;
+    volatile uint8 state;
+    uint16 msgs_left;
+    i2c_msg *msg;
+} i2c_dev;
+
+
+extern i2c_dev* const I2C1;
+
+#define I2C1_BASE               (i2c_reg_map*)0x40005400
+#define I2C2_BASE               (i2c_reg_map*)0x40005800
+
+/* i2c enable options */
+#define I2C_FAST_MODE           0x1             // 400 khz
+#define I2C_DUTY_16_9           0x2             // 16/9 duty ratio
+
+/* Control register 1 bits */
+#define I2C_CR1_SWRST           BIT(15)         // Software reset
+#define I2C_CR1_ALERT           BIT(13)         // SMBus alert
+#define I2C_CR1_PEC             BIT(12)         // Packet error checking
+#define I2C_CR1_POS             BIT(11)         // Acknowledge/PEC position
+#define I2C_CR1_ACK             BIT(10)         // Acknowledge enable
+#define I2C_CR1_START           BIT(8)          // Start generation
+#define I2C_CR1_STOP            BIT(9)          // Stop generation
+#define I2C_CR1_PE              BIT(0)          // Peripheral Enable
+
+/* Control register 2 bits */
+#define I2C_CR2_LAST            BIT(12)         // DMA last transfer
+#define I2C_CR2_DMAEN           BIT(11)         // DMA requests enable
+#define I2C_CR2_ITBUFEN         BIT(10)         // Buffer interrupt enable
+#define I2C_CR2_ITEVTEN         BIT(9)          // Event interupt enable
+#define I2C_CR2_ITERREN         BIT(8)          // Error interupt enable
+#define I2C_CR2_FREQ            0xFFF           // Peripheral input frequency
+
+/* Clock control register bits */
+#define I2C_CCR_FS              BIT(15)         // Master mode selection
+#define I2C_CCR_CCR             0xFFF           // Clock control bits
+
+/* Status register 1 bits  */
+#define I2C_SR1_SB              BIT(0)          // Start bit
+#define I2C_SR1_ADDR            BIT(1)          // Address sent/matched
+#define I2C_SR1_BTF             BIT(2)          // Byte transfer finished
+#define I2C_SR1_ADD10           BIT(3)          // 10-bit header sent
+#define I2C_SR1_STOPF           BIT(4)          // Stop detection
+#define I2C_SR1_RXNE            BIT(6)          // Data register not empty
+#define I2C_SR1_TXE             BIT(7)          // Data register empty
+#define I2C_SR1_BERR            BIT(8)          // Bus error
+#define I2C_SR1_ARLO            BIT(9)          // Arbitration lost
+#define I2C_SR1_AF              BIT(10)         // Acknowledge failure
+#define I2C_SR1_OVR             BIT(11)         // Overrun/underrun
+#define I2C_SR1_PECERR          BIT(12)         // PEC Error in reception
+#define I2C_SR1_TIMEOUT         BIT(14)         // Timeout or Tlow error
+#define I2C_SR1_SMBALERT        BIT(15)         // SMBus alert
+
+/* Status register 2 bits */
+#define I2C_SR2_MSL             BIT(0)          // Master/slave
+#define I2C_SR2_BUSY            BIT(1)          // Bus busy
+#define I2C_SR2_TRA             BIT(2)          // Transmitter/receiver
+#define I2C_SR2_GENCALL         BIT(4)          // General call address
+#define I2C_SR2_SMBDEFAULT      BIT(5)          // SMBus device default address
+#define I2C_SR2_SMBHOST         BIT(6)          // SMBus host header
+#define I2C_SR2_DUALF           BIT(7)          // Dual flag
+#define I2C_SR2_PEC             0xFF00          // Packet error checking register
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void i2c_master_enable(i2c_dev *dev, uint32 flags);
+int32 i2c_master_xfer(i2c_dev *dev, i2c_msg *msgs, uint16 num);
+
+/*
+ * Low level register twiddling functions
+ */
+
+/**
+ * @brief turn on an i2c peripheral
+ * @param dev i2c device
+ */
+static inline void i2c_peripheral_enable(i2c_dev *dev) {
+    dev->regs->CR1 |= I2C_CR1_PE;
+}
+
+/**
+ * @brief turn off an i2c peripheral
+ * @param dev i2c device
+ */
+static inline void i2c_peripheral_disable(i2c_dev *dev) {
+    dev->regs->CR1 &= ~I2C_CR1_PE;
+}
+
+/**
+ * @brief Fill transmit register
+ * @param dev i2c device
+ * @param byte byte to write
+ */
+static inline void i2c_write(i2c_dev *dev, uint8 byte) {
+    dev->regs->DR = byte;
+}
+
+
+/**
+ * @brief Set input clock frequency, in mhz
+ * @param dev i2c
+ * @param freq frequency in megahertz (2-36)
+ */
+static inline void i2c_set_input_clk(i2c_dev *dev, uint32 freq) {
+    uint32 cr2 = dev->regs->CR2;
+    cr2 &= ~I2C_CR2_FREQ;
+    cr2 |= freq;
+    dev->regs->CR2 = freq;
+}
+
+
+/**
+ * @brief Set i2c clock control register. See RM008
+ * @param dev i2c device
+ * @return
+ * @sideeffect
+ */
+static inline void i2c_set_clk_control(i2c_dev *dev, uint32 val) {
+    uint32 ccr = dev->regs->CCR;
+    ccr &= ~I2C_CCR_CCR;
+    ccr |= val;
+    dev->regs->CCR = ccr;
+}
+
+static inline void i2c_set_fast_mode(i2c_dev *dev) {
+    dev->regs->CCR |= I2C_CCR_FS;
+}
+
+static inline void i2c_set_standard_mode(i2c_dev *dev) {
+    dev->regs->CCR &= ~I2C_CCR_FS;
+}
+
+/**
+ * @brief Set SCL rise time
+ * @param
+ */
+static inline void i2c_set_trise(i2c_dev *dev, uint32 trise) {
+    dev->regs->TRISE = trise;
+}
+
+static inline void i2c_start_condition(i2c_dev *dev) {
+    uint32 cr1;
+    while ((cr1 = dev->regs->CR1) & (I2C_CR1_START |
+                                     I2C_CR1_STOP  |
+                                     I2C_CR1_PEC)) {
+        ;
+    }
+    dev->regs->CR1 |= I2C_CR1_START;
+}
+
+static inline void i2c_stop_condition(i2c_dev *dev) {
+    uint32 cr1;
+    while ((cr1 = dev->regs->CR1) & (I2C_CR1_START |
+                                     I2C_CR1_STOP  |
+                                     I2C_CR1_PEC)) {
+        ;
+    }
+    dev->regs->CR1 |= I2C_CR1_STOP;
+}
+
+static inline void i2c_send_slave_addr(i2c_dev *dev, uint32 addr, uint32 rw) {
+    dev->regs->DR = (addr << 1) | rw;
+}
+
+#define I2C_IRQ_ERROR              I2C_CR2_ITERREN
+#define I2C_IRQ_EVENT              I2C_CR2_ITEVTEN
+#define I2C_IRQ_BUFFER             I2C_CR2_ITBUFEN
+static inline void i2c_enable_irq(i2c_dev *dev, uint32 irqs) {
+    dev->regs->CR2 |= irqs;
+}
+
+static inline void i2c_disable_irq(i2c_dev *dev, uint32 irqs) {
+    dev->regs->CR2 &= ~irqs;
+}
+
+static inline void i2c_enable_ack(i2c_dev *dev) {
+    dev->regs->CR1 |= I2C_CR1_ACK;
+}
+
+static inline void i2c_disable_ack(i2c_dev *dev) {
+    dev->regs->CR1 &= ~I2C_CR1_ACK;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+