- tx and rx callbacks for each module

 - Callbacks can be called after each read/write cycle or per byte
 - Each I2C module can have different callbacks
 - General call support also working
 - Supports master and slave at same time. Also works with multimaster

Usage:

i2c_msg msg;
char buffer[255];

main()
{
    i2c_slave_enable(I2C1, I2C_FAST_MODE | I2C_SLAVE_DUAL_ADDRESS | I2C_SLAVE_GENERAL_CALL | I2C_SLAVE_USE_RX_BUFFER); // init slave mode. Enables master too
    i2c_slave_attach_recv_handler(I2C1, pmsg, funcrx); // attach  receive handler
    i2c_slave_attach_transmit_handler(I2C1, pmsg, functx);   // attach transmit handler
    i2c_slave_set_own_address(I2C1, 0x10);    // set addresss 1
    i2c_slave_set_own_address2(I2C1, 0x20);   // set addresss 2
}

void funcrx(i2c_msg *msg)
{
    printf("length is %d.\n", msg->length);
    char return_data = msg0>data[0];
}

void functx(i2c_msg *dev)
{
    msg->data[0] = 0x01;
    msg->data[1] = 0x02;
    msg->data[2] = 0x03;
    msg->data[3] = 0x04;
    msg->data[4] = 0x05;
    msg->length = 5;
}

All code derived from datasheets and libmaple.
Signed-off-by:- Barry Carter <barry.carter@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/libmaple/include/libmaple/i2c_common.h b/libmaple/include/libmaple/i2c_common.h
index 17cabe3..5debcb8 100644
--- a/libmaple/include/libmaple/i2c_common.h
+++ b/libmaple/include/libmaple/i2c_common.h
@@ -52,9 +52,12 @@ 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.
  */
@@ -88,6 +91,17 @@ 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