Revert "- tx and rx callbacks for each module"

This reverts commit da01c80f24dc9c43ff951ea9fd283abb4628ceb7.

Reverting pull request #54, which breaks examples/i2c-mcp4725-dac.cpp.

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

4 files changed, 1 insertions, 306 deletions

diff --git a/CREDITS b/CREDITS
index 5918e01..2b803b1 100644
--- a/CREDITS
+++ b/CREDITS
@@ -81,9 +81,3 @@ W: http://sarup.dk/index.html
 N: Andy Scott ("xttocs")
 E: andy.g.scott@gmail.com
 D: LiquidCrystal library
-
-N: Barry Carter ("ginge")
-E: barry.carter@gmail.com
-D: Added i2C slave support
-W: headfuzz.co.uk
- 
\ No newline at end of file
diff --git a/libmaple/i2c.c b/libmaple/i2c.c
index b8e622d..9c93d3f 100644
--- a/libmaple/i2c.c
+++ b/libmaple/i2c.c
@@ -154,7 +154,6 @@ void i2c_bus_reset(const i2c_dev *dev) {
 void i2c_init(i2c_dev *dev) {
     rcc_reset_dev(dev->clk_id);
     rcc_clk_enable(dev->clk_id);
-    _i2c_irq_priority_fixup(dev);
 }
 
 /* Hack for deprecated bit of STM32F1 functionality */
@@ -199,30 +198,12 @@ void i2c_master_enable(i2c_dev *dev, uint32 flags) {
     nvic_irq_enable(dev->er_nvic_line);
     i2c_enable_irq(dev, I2C_IRQ_EVENT | I2C_IRQ_BUFFER | I2C_IRQ_ERROR);
 
-    /* Configure the slave unit */
-    if (flags & I2C_SLAVE_DUAL_ADDRESS) {
-        i2c_slave_dual_address_enable(dev);
-    }
-
-    if (flags & I2C_SLAVE_GENERAL_CALL) {
-        i2c_slave_general_call_enable(dev);
-    }
-
-    /* store all of the flags */
-    dev->config_flags = flags;
-
     /* Make it go! */
     i2c_peripheral_enable(dev);
-    i2c_enable_ack(dev);
 
     dev->state = I2C_STATE_IDLE;
 }
 
-void i2c_slave_enable(i2c_dev *dev, uint32 flags) {
-    i2c_disable(dev);
-    i2c_master_enable(dev, dev->config_flags | flags);
-}
-
 /**
  * @brief Process an i2c transaction.
  *
@@ -322,152 +303,6 @@ void _i2c_irq_handler(i2c_dev *dev) {
      */
     dev->timestamp = systick_uptime();
 
-    /* Add Slave support
-     * Barry Carter 2012
-     * barry.carter@gmail.com
-     */
-    
-    /* Check to see if MSL master slave bit is set */
-    if ((sr2 & I2C_SR2_MSL) != I2C_SR2_MSL) { /* 0 = slave mode 1 = master */
-
-        /* Check for address match */
-        if (sr1 & I2C_SR1_ADDR) {
-            /* Find out which address was matched */
-            /* Check the general call address first */
-            if (sr2 & I2C_SR2_GENCALL) {
-                dev->i2c_slave_msg->addr = 0;
-            }
-            /* We matched the secondary address */
-            else if (sr2 & I2C_SR2_DUALF) {
-                dev->i2c_slave_msg->addr = dev->regs->OAR2 & 0xFE;
-            }
-            /* We matched the primary address */
-            else if ((sr2 & I2C_SR2_DUALF) != I2C_SR2_DUALF) {
-                dev->i2c_slave_msg->addr = dev->regs->OAR1 & 0xFE;
-            }
-            /* Shouldn't get here */
-            else {
-                dev->i2c_slave_msg->addr = -1; /* uh oh */
-            }
-
-            /* if we have buffered io */
-            if ((dev->config_flags & I2C_SLAVE_USE_RX_BUFFER) ||
-                (dev->config_flags & I2C_SLAVE_USE_TX_BUFFER)) {
-
-                /* if receiving then this would be a repeated start
-                 *
-                 *if we have some bytes already
-                 */
-                if ((dev->state == I2C_STATE_SL_RX) &&
-                    (dev->i2c_slave_msg->xferred > 0)  &&
-                    (dev->config_flags & I2C_SLAVE_USE_RX_BUFFER)) {
-                    /* Call the callback with the contents of the data */
-                    if (dev->i2c_slave_recv_callback != NULL) {
-                        (*(dev->i2c_slave_recv_callback))(dev->i2c_slave_msg);
-                    }
-                }
-
-                /* Reset the message back to defaults.
-                 * We are starting a new message
-                 */
-                dev->i2c_slave_msg->flags = 0;
-                dev->i2c_slave_msg->length = 0;
-                dev->i2c_slave_msg->xferred = 0;
-                dev->msgs_left = 0;
-                dev->timestamp = systick_uptime();
-
-                /* We have been addressed with SLA+R so
-                 * the master wants us to transmit
-                 */
-                if ((sr1 & I2C_SR1_TXE) &&
-                    (dev->config_flags & I2C_SLAVE_USE_TX_BUFFER)) {
-                    /* Call the transmit callback so it can populate the msg
-                     * data with the bytes to go
-                     */
-                    if (dev->i2c_slave_transmit_callback != NULL) {
-                        (*(dev->i2c_slave_transmit_callback))(dev->i2c_slave_msg);
-                    }
-                }
-                dev->state = I2C_STATE_BUSY;
-            }
-
-            sr1 = sr2 = 0;
-        }
-        
-         /* EV3: Master requesting data from slave. Transmit a byte*/
-        if (sr1 & I2C_SR1_TXE) {
-            if (dev->config_flags & I2C_SLAVE_USE_TX_BUFFER) {
-                if (dev->i2c_slave_msg->xferred >= dev->i2c_slave_msg->length) {
-                    /* End of the transmit buffer? If so we NACK */
-                    i2c_disable_ack(dev);
-                    /* We have to either issue a STOP or write something here.
-                     * STOP here seems to screw up some masters,
-                     * For now padding with 0
-                     */
-                    i2c_write(dev, 0);
-                    /*i2c_stop_condition(dev); // This is causing bus lockups way more than it should !? Seems some I2C master devices freak out here*/
-                }
-                else
-                {
-                    /* NACk the last byte */
-                    if (dev->i2c_slave_msg->xferred == dev->i2c_slave_msg->length-1) {
-                        i2c_disable_ack(dev);
-                    }
-                    else {
-                        i2c_enable_ack(dev);
-                    }
-                    i2c_write(dev, dev->i2c_slave_msg->data[dev->i2c_slave_msg->xferred++]);
-                }
-            }
-            else
-            {
-                /* Call the callback to get the data we need.
-                 * The callback is expected to write using i2c_write(...)
-                 * If the slave is going to terminate the transfer, this function should
-                 * also do a NACK on the last byte!
-                 */
-                if (dev->i2c_slave_transmit_callback != NULL) (*(dev->i2c_slave_transmit_callback))(dev->i2c_slave_msg);
-            }
-
-            dev->state = I2C_STATE_BUSY;
-            sr1 = sr2 = 0;
-        }
-        
-        /* EV2: Slave received data from a master. Get from DR */
-        if (sr1 & I2C_SR1_RXNE) {
-            if (dev->config_flags & I2C_SLAVE_USE_RX_BUFFER) {
-                /* Fill the buffer with the contents of the data register */
-                dev->i2c_slave_msg->data[dev->i2c_slave_msg->xferred++] = dev->regs->DR;
-                dev->i2c_slave_msg->length++;
-            }
-            else  {
-                /* Call the callback with the contents of the data */
-                dev->i2c_slave_msg->data[0] = dev->regs->DR;
-                if (dev->i2c_slave_recv_callback != NULL) (*(dev->i2c_slave_recv_callback))(dev->i2c_slave_msg);
-            }
-            dev->state = I2C_STATE_SL_RX;
-            sr1 = sr2 = 0;
-        }
-
-        /* EV4: Slave has detected a STOP condition on the bus */
-        if (sr1 & I2C_SR1_STOPF) {
-            dev->regs->CR1 |= I2C_CR1_PE;
-
-            if ((dev->config_flags & I2C_SLAVE_USE_RX_BUFFER) ||
-                (dev->config_flags & I2C_SLAVE_USE_TX_BUFFER)) {
-
-                /* The callback with the data will happen on a NACK of the last data byte.
-                 * This is handled in the error IRQ (AF bit)
-                 */
-            }
-
-            sr1 = sr2 = 0;
-            dev->state = I2C_STATE_IDLE;
-        }
-
-        return;
-    }
-    
     /*
      * EV5: Start condition sent
      */
@@ -612,7 +447,6 @@ void _i2c_irq_handler(i2c_dev *dev) {
             }
         }
     }
-
 }
 
 /*
@@ -622,49 +456,10 @@ void _i2c_irq_handler(i2c_dev *dev) {
 void _i2c_irq_error_handler(i2c_dev *dev) {
     I2C_CRUMB(ERROR_ENTRY, dev->regs->SR1, dev->regs->SR2);
 
-    dev->error_flags = dev->regs->SR1 & (I2C_SR1_BERR |
+    dev->error_flags = dev->regs->SR2 & (I2C_SR1_BERR |
                                          I2C_SR1_ARLO |
                                          I2C_SR1_AF |
                                          I2C_SR1_OVR);
-
-    /* Are we in slave mode? */
-    if ((dev->regs->SR2 & I2C_SR2_MSL) != I2C_SR2_MSL) {
-        /* Check to see if the master device did a NAK on the last bit
-         * This is perfectly valid for a master to do this on the bus.
-         * We ignore this. Any further error processing takes us into dead
-         * loop waiting for the stop condition that will never arrive
-         */
-        if (dev->regs->SR1 & I2C_SR1_AF) {
-            /* Clear flags */
-            dev->regs->SR1 = 0;
-            dev->regs->SR2 = 0;
-            /* We need to write something to CR1 to clear the flag.
-             * This isn't really mentioned but seems important */
-            i2c_enable_ack(dev);
-
-            if (dev->state == I2C_STATE_SL_RX &&
-                dev->config_flags & I2C_SLAVE_USE_RX_BUFFER &&
-                dev->i2c_slave_msg->xferred > 0) {
-                /* Call the callback with the contents of the data */
-                if (dev->i2c_slave_recv_callback != NULL) (*(dev->i2c_slave_recv_callback))(dev->i2c_slave_msg);
-            }
-
-            dev->state = I2C_STATE_IDLE;
-            return;
-        }
-        /* Catch any other strange errors while in slave mode.
-         * I have seen BERR caused by an over fast master device
-         * as well as several overflows and arbitration failures.
-         * We are going to reset SR flags and carry on at this point which
-         * is not the best thing to do, but stops the bus locking up completely
-         * If we carry on below and send the stop bit, the code spins forever */
-        /* Clear flags */
-        dev->regs->SR1 = 0;
-        dev->regs->SR2 = 0;
-        dev->state = I2C_STATE_IDLE;
-        return;
-    }
-
     /* Clear flags */
     dev->regs->SR1 = 0;
     dev->regs->SR2 = 0;
@@ -712,31 +507,3 @@ static void set_ccr_trise(i2c_dev *dev, uint32 flags) {
     i2c_set_clk_control(dev, ccr);
     i2c_set_trise(dev, trise);
 }
-
-
-/**
- * @brief callback for when the device acts as a slave. If using an rx buffer, this is triggered
- * after the last byte, otherwise it is called for every incoming packet.
- * @param dev I2C device
- * @param msg The dev_msg to pass to the slave init code
- * @param func The function pointer to call
- */
-void i2c_slave_attach_recv_handler(i2c_dev *dev, i2c_msg *msg, i2c_slave_recv_callback_func func) {
-    dev->i2c_slave_recv_callback = func;
-    dev->i2c_slave_msg = msg;
-    msg->xferred = 0;
-}
-
-
-/**
- * @brief callback for when the device acts as a slave. If using a tx buffer, this is triggered
- * after the device is successsfully addressed with SLA+R.
- * @param dev I2C device
- * @param msg The dev_msg to pass to the slave init code
- * @param func The function pointer to call
- */
-void i2c_slave_attach_transmit_handler(i2c_dev *dev, i2c_msg *msg, i2c_slave_transmit_callback_func func) {
-    dev->i2c_slave_transmit_callback = func;
-    dev->i2c_slave_msg = msg;
-    msg->xferred = 0;
-}
diff --git a/libmaple/include/libmaple/i2c.h b/libmaple/include/libmaple/i2c.h
index d4eac61..ff1c313 100644
--- a/libmaple/include/libmaple/i2c.h
+++ b/libmaple/include/libmaple/i2c.h
@@ -93,7 +93,6 @@ typedef struct i2c_msg {
 
 #define I2C_MSG_READ            0x1
 #define I2C_MSG_10BIT_ADDR      0x2
-
     /**
      * Bitwise OR of:
      * - I2C_MSG_READ (write is default)
@@ -198,10 +197,6 @@ typedef struct i2c_msg {
 #define I2C_DUTY_16_9           0x2           // 16/9 duty ratio
 /* Flag 0x4 is reserved; DO NOT USE. */
 #define I2C_BUS_RESET           0x8           // Perform a bus reset
-#define I2C_SLAVE_USE_RX_BUFFER 0x10          // Use a buffered message when doing a slave recv
-#define I2C_SLAVE_USE_TX_BUFFER 0x20          // Use a buffered message when doing a slave transmit
-#define I2C_SLAVE_DUAL_ADDRESS  0x40          // Enable the dual slave address scheme
-#define I2C_SLAVE_GENERAL_CALL  0x80          // Enable the dual slave address scheme
 void i2c_master_enable(i2c_dev *dev, uint32 flags);
 
 #define I2C_ERROR_PROTOCOL      (-1)
@@ -411,53 +406,6 @@ static inline void i2c_set_trise(i2c_dev *dev, uint32 trise) {
     dev->regs->TRISE = trise;
 }
 
-/* Barry Carter
- * Slave support
- */
-
-/**
- * @brief Enable Dual addressing mode to allow peripheral to have 2 addresses
- * @param dev I2C device
-  */
-static inline void i2c_slave_dual_address_enable(i2c_dev *dev) {
-    dev->regs->OAR2 |= I2C_OAR2_ENDUAL;
-}
-
-/**
- * @brief Enable General Call to allow the  unit to respond on addr 0x00
- * @param dev I2C device
-  */
-static inline void i2c_slave_general_call_enable(i2c_dev *dev) {
-    dev->regs->CR1 |= I2C_CR1_ENGC;
-}
-
-/* callback functions */
-/* Callback handler for data received over the bus */
-void i2c_slave_attach_recv_handler(i2c_dev *dev, i2c_msg *msg, i2c_slave_recv_callback_func func);
-
-/* Callback handler for data being requested over the bus
- * The callback function must call i2c_write to get the data over the bus
- */
-void i2c_slave_attach_transmit_handler(i2c_dev *dev, i2c_msg *msg, i2c_slave_transmit_callback_func func);
-
-/**
- * @brief Set the primary I2c slave address
- * @param dev I2C device
- * @param address the 8 or 10 bit i2c address
-  */
-static inline void i2c_slave_set_own_address(i2c_dev *dev, uint16 address) {
-    dev->regs->OAR1 = address <<1;
-}
-
-/**
- * @brief Set the secondary I2c slave address
- * @param dev I2C device
- * @param address the 8 or 10 bit i2c address
-  */
-static inline void i2c_slave_set_own_address2(i2c_dev *dev, uint16 address) {
-dev->regs->OAR2 = (address <<1 ) | I2C_OAR2_ENDUAL;
-}
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/libmaple/include/libmaple/i2c_common.h b/libmaple/include/libmaple/i2c_common.h
index 5debcb8..17cabe3 100644
--- a/libmaple/include/libmaple/i2c_common.h
+++ b/libmaple/include/libmaple/i2c_common.h
@@ -52,12 +52,9 @@ typedef enum i2c_state {
     I2C_STATE_IDLE              = 1, /**< Idle */
     I2C_STATE_XFER_DONE         = 2, /**< Done with transfer */
     I2C_STATE_BUSY              = 3, /**< Busy */
-    I2C_STATE_SL_RX             = 4, /**< Slave receiving */
     I2C_STATE_ERROR             = -1 /**< Error occurred */
 } i2c_state;
 
-typedef void (*i2c_slave_recv_callback_func)(struct i2c_msg *);
-typedef void (*i2c_slave_transmit_callback_func)(struct i2c_msg *);
 /**
  * @brief I2C device type.
  */
@@ -91,17 +88,6 @@ typedef struct i2c_dev {
     nvic_irq_num ev_nvic_line;  /**< Event IRQ number */
     nvic_irq_num er_nvic_line;  /**< Error IRQ number */
     volatile i2c_state state;   /**< Device state */
-    uint32 config_flags;        /**< Configuration flags */
-
-    /* Barry Carter
-     * Slave implementation. Callback functions in this struct allow
-     * for a separate callback function for each I2C unit available onboard
-     */
-    i2c_slave_transmit_callback_func i2c_slave_transmit_callback;
-    i2c_slave_recv_callback_func i2c_slave_recv_callback;
-
-    struct i2c_msg *i2c_slave_msg; /* the message that the i2c slave will use */
-
 } i2c_dev;
 
 #endif