Added i2c control transactions in fw and host

4 files changed, 68 insertions, 9 deletions

diff --git a/host/include/uhd/usrp/dboard/interface.hpp b/host/include/uhd/usrp/dboard/interface.hpp
index e066f2061..495304338 100644
--- a/host/include/uhd/usrp/dboard/interface.hpp
+++ b/host/include/uhd/usrp/dboard/interface.hpp
@@ -126,10 +126,10 @@ public:
     /*!
      * \brief Read from I2C peripheral
      * \param i2c_addr I2C bus address (7-bits)
-     * \param len number of bytes to read
+     * \param num_bytes number of bytes to read
      * \return the data read if successful, else a zero length string.
      */
-    virtual byte_vector_t read_i2c(int i2c_addr, size_t len) = 0;
+    virtual byte_vector_t read_i2c(int i2c_addr, size_t num_bytes) = 0;
 
     /*!
      * \brief Write data to SPI bus peripheral.
diff --git a/host/lib/usrp/mboard/usrp2/dboard_interface.cpp b/host/lib/usrp/mboard/usrp2/dboard_interface.cpp
index d244e0bee..fd51558f2 100644
--- a/host/lib/usrp/mboard/usrp2/dboard_interface.cpp
+++ b/host/lib/usrp/mboard/usrp2/dboard_interface.cpp
@@ -19,6 +19,8 @@
 #include "dboard_interface.hpp"
 #include "fw_common.h"
 
+using namespace uhd::usrp::dboard;
+
 /***********************************************************************
  * Structors
  **********************************************************************/
@@ -50,7 +52,7 @@ double dboard_interface::get_tx_clock_rate(void){
  * \param bank the dboard interface gpio bank enum
  * \return an over the wire representation
  */
-static uint8_t gpio_bank_to_otw(uhd::usrp::dboard::interface::gpio_bank_t bank){
+static uint8_t gpio_bank_to_otw(interface::gpio_bank_t bank){
     switch(bank){
     case uhd::usrp::dboard::interface::GPIO_TX_BANK: return USRP2_DIR_TX;
     case uhd::usrp::dboard::interface::GPIO_RX_BANK: return USRP2_DIR_RX;
@@ -119,7 +121,7 @@ void dboard_interface::set_atr_reg(gpio_bank_t bank, uint16_t tx_value, uint16_t
  * \param dev the dboard interface spi dev enum
  * \return an over the wire representation
  */
-static uint8_t spi_dev_to_otw(uhd::usrp::dboard::interface::spi_dev_t dev){
+static uint8_t spi_dev_to_otw(interface::spi_dev_t dev){
     switch(dev){
     case uhd::usrp::dboard::interface::SPI_TX_DEV: return USRP2_DIR_TX;
     case uhd::usrp::dboard::interface::SPI_RX_DEV: return USRP2_DIR_RX;
@@ -133,7 +135,7 @@ static uint8_t spi_dev_to_otw(uhd::usrp::dboard::interface::spi_dev_t dev){
  * \param latch the dboard interface spi latch enum
  * \return an over the wire representation
  */
-static uint8_t spi_latch_to_otw(uhd::usrp::dboard::interface::spi_latch_t latch){
+static uint8_t spi_latch_to_otw(interface::spi_latch_t latch){
     switch(latch){
     case uhd::usrp::dboard::interface::SPI_LATCH_RISE: return USRP2_CLK_EDGE_RISE;
     case uhd::usrp::dboard::interface::SPI_LATCH_FALL: return USRP2_CLK_EDGE_FALL;
@@ -147,7 +149,7 @@ static uint8_t spi_latch_to_otw(uhd::usrp::dboard::interface::spi_latch_t latch)
  * \param push the dboard interface spi push enum
  * \return an over the wire representation
  */
-static uint8_t spi_push_to_otw(uhd::usrp::dboard::interface::spi_push_t push){
+static uint8_t spi_push_to_otw(interface::spi_push_t push){
     switch(push){
     case uhd::usrp::dboard::interface::SPI_PUSH_RISE: return USRP2_CLK_EDGE_RISE;
     case uhd::usrp::dboard::interface::SPI_PUSH_FALL: return USRP2_CLK_EDGE_FALL;
@@ -155,7 +157,7 @@ static uint8_t spi_push_to_otw(uhd::usrp::dboard::interface::spi_push_t push){
     throw std::invalid_argument("unknown spi push type");
 }
 
-uhd::usrp::dboard::interface::byte_vector_t dboard_interface::transact_spi(
+interface::byte_vector_t dboard_interface::transact_spi(
     spi_dev_t dev,
     spi_latch_t latch,
     spi_push_t push,
@@ -191,3 +193,49 @@ uhd::usrp::dboard::interface::byte_vector_t dboard_interface::transact_spi(
     }
     return result;
 }
+
+/***********************************************************************
+ * I2C
+ **********************************************************************/
+void dboard_interface::write_i2c(int i2c_addr, const byte_vector_t &buf){
+    //setup the out data
+    usrp2_ctrl_data_t out_data;
+    out_data.id = htonl(USRP2_CTRL_ID_WRITE_THESE_I2C_VALUES_BRO);
+    out_data.data.i2c_args.addr = i2c_addr;
+    out_data.data.i2c_args.bytes = buf.size();
+
+    //limitation of i2c transaction size
+    ASSERT_THROW(buf.size() <= sizeof(out_data.data.i2c_args.data));
+
+    //copy in the data
+    for (size_t i = 0; i < buf.size(); i++){
+        out_data.data.i2c_args.data[i] = buf[i];
+    }
+
+    //send and recv
+    usrp2_ctrl_data_t in_data = _impl->ctrl_send_and_recv(out_data);
+    ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_COOL_IM_DONE_I2C_WRITE_DUDE);
+}
+
+interface::byte_vector_t dboard_interface::read_i2c(int i2c_addr, size_t num_bytes){
+    //setup the out data
+    usrp2_ctrl_data_t out_data;
+    out_data.id = htonl(USRP2_CTRL_ID_DO_AN_I2C_READ_FOR_ME_BRO);
+    out_data.data.i2c_args.addr = i2c_addr;
+    out_data.data.i2c_args.bytes = num_bytes;
+
+    //limitation of i2c transaction size
+    ASSERT_THROW(num_bytes <= sizeof(out_data.data.i2c_args.data));
+
+    //send and recv
+    usrp2_ctrl_data_t in_data = _impl->ctrl_send_and_recv(out_data);
+    ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_HERES_THE_I2C_DATA_DUDE);
+    ASSERT_THROW(in_data.data.i2c_args.addr = num_bytes);
+
+    //copy out the data
+    byte_vector_t result;
+    for (size_t i = 0; i < num_bytes; i++){
+        result.push_back(in_data.data.i2c_args.data[i]);
+    }
+    return result;
+}
diff --git a/host/lib/usrp/mboard/usrp2/dboard_interface.hpp b/host/lib/usrp/mboard/usrp2/dboard_interface.hpp
index 8880eaf97..fb197a87a 100644
--- a/host/lib/usrp/mboard/usrp2/dboard_interface.hpp
+++ b/host/lib/usrp/mboard/usrp2/dboard_interface.hpp
@@ -39,9 +39,9 @@ public:
 
     uint16_t read_gpio(gpio_bank_t);
 
-    void write_i2c(int, const byte_vector_t &){}
+    void write_i2c(int, const byte_vector_t &);
 
-    byte_vector_t read_i2c(int, size_t){return byte_vector_t();}
+    byte_vector_t read_i2c(int, size_t);
 
     double get_rx_clock_rate(void);
 
diff --git a/host/lib/usrp/mboard/usrp2/fw_common.h b/host/lib/usrp/mboard/usrp2/fw_common.h
index 8e5810a14..91cb88c53 100644
--- a/host/lib/usrp/mboard/usrp2/fw_common.h
+++ b/host/lib/usrp/mboard/usrp2/fw_common.h
@@ -66,6 +66,12 @@ typedef enum{
     USRP2_CTRL_ID_TRANSACT_ME_SOME_SPI_BRO,
     USRP2_CTRL_ID_OMG_TRANSACTED_SPI_DUDE,
 
+    USRP2_CTRL_ID_DO_AN_I2C_READ_FOR_ME_BRO,
+    USRP2_CTRL_ID_HERES_THE_I2C_DATA_DUDE,
+
+    USRP2_CTRL_ID_WRITE_THESE_I2C_VALUES_BRO,
+    USRP2_CTRL_ID_COOL_IM_DONE_I2C_WRITE_DUDE,
+
     USRP2_CTRL_ID_PEACE_OUT
 
 } usrp2_ctrl_id_t;
@@ -133,6 +139,11 @@ typedef struct{
             uint8_t bytes;
             uint8_t data[sizeof(uint32_t)];
         } spi_args;
+        struct {
+            uint8_t addr;
+            uint8_t bytes;
+            uint8_t data[sizeof(uint32_t)];
+        } i2c_args;
     } data;
 } usrp2_ctrl_data_t;