mpm: spi: Added 16-bit access to SPI regs

3 files changed, 45 insertions, 1 deletions

diff --git a/mpm/include/mpm/types/regs_iface.hpp b/mpm/include/mpm/types/regs_iface.hpp
index 78e590b23..80005a4b0 100644
--- a/mpm/include/mpm/types/regs_iface.hpp
+++ b/mpm/include/mpm/types/regs_iface.hpp
@@ -41,6 +41,19 @@ namespace mpm { namespace types {
             const uint32_t addr,
             const uint8_t data
         ) = 0;
+
+        /*! Return a 16-bit value from a given address
+         */
+        virtual uint16_t peek16(
+            const uint32_t addr
+        ) = 0;
+
+        /*! Write a 16-bit value to a given address
+         */
+        virtual void poke16(
+            const uint32_t addr,
+            const uint16_t data
+        ) = 0;
     };
 
 }}; /* namespace mpm::regs */
diff --git a/mpm/include/mpm/types/types_python.hpp b/mpm/include/mpm/types/types_python.hpp
index a0a00aa48..ef31408e7 100644
--- a/mpm/include/mpm/types/types_python.hpp
+++ b/mpm/include/mpm/types/types_python.hpp
@@ -31,6 +31,8 @@ void export_types() {
     bp::class_<regs_iface, boost::noncopyable, std::shared_ptr<regs_iface> >("regs_iface", bp::no_init)
         .def("peek8", &regs_iface::peek8)
         .def("poke8", &regs_iface::poke8)
+        .def("peek16", &regs_iface::peek16)
+        .def("poke16", &regs_iface::poke16)
    ;
 }
 
diff --git a/mpm/lib/spi/spi_regs_iface.cpp b/mpm/lib/spi/spi_regs_iface.cpp
index ab9e089f8..40b376ee1 100644
--- a/mpm/lib/spi/spi_regs_iface.cpp
+++ b/mpm/lib/spi/spi_regs_iface.cpp
@@ -58,7 +58,7 @@ public:
             throw mpm::runtime_error("SPI read returned too much data");
         }
 
-        return uint8_t(data & 0xFF);
+        return data;
     }
 
     void poke8(
@@ -74,6 +74,35 @@ public:
         _spi_iface->transfer24_8(transaction);
     }
 
+    uint16_t peek16(
+        const uint32_t addr
+    ) {
+        uint32_t transaction = 0
+            | (addr << _addr_shift)
+            | _read_flags
+        ;
+
+        uint32_t data = _spi_iface->transfer24_8(transaction);
+        if ((data & 0xFFFF0000) != 0) {
+            throw mpm::runtime_error("SPI read returned too much data");
+        }
+
+        return data;
+    }
+
+    void poke16(
+        const uint32_t addr,
+        const uint16_t data
+    ) {
+        uint32_t transaction = 0
+            | _write_flags
+            | (addr << _addr_shift)
+            | (data << _data_shift)
+        ;
+
+        _spi_iface->transfer24_8(transaction);
+    }
+
 private:
     mpm::spi::spi_iface::sptr _spi_iface;