Implement Adafruit_BusIO-style write/read method for SPI.

Author: aentinger

src/spi/SpiBusDevice.cpp

@@ -43,6 +43,23 @@ IoResponse SpiBusDevice::transfer(IoRequest & req)
   return SpiDispatcher::instance().dispatch(&req, &_config);
 }
 
+bool SpiBusDevice::read(uint8_t * buffer, size_t len, uint8_t sendvalue)
+{
+  SpiBusDeviceConfig config(_config.spi(), _config.settings(), _config.select_func(), _config.deselect_func(), sendvalue);
+  IoRequest req(nullptr, 0, buffer, len);
+  IoResponse rsp = SpiDispatcher::instance().dispatch(&req, &config);
+  rsp->wait();
+  return true;
+}
+
+bool SpiBusDevice::write(const uint8_t * buffer, size_t len)
+{
+  IoRequest req(buffer, len, nullptr, 0);
+  IoResponse rsp = SpiDispatcher::instance().dispatch(&req, &_config);
+  rsp->wait();
+  return true;
+}
+
 bool SpiBusDevice::write_then_read(const uint8_t * write_buffer, size_t write_len, uint8_t * read_buffer, size_t read_len, uint8_t sendvalue)
 {
   SpiBusDeviceConfig config(_config.spi(), _config.settings(), _config.select_func(), _config.deselect_func(), sendvalue);

src/spi/SpiBusDevice.h

@@ -42,6 +42,8 @@ class SpiBusDevice : public BusDeviceBase
   virtual IoResponse transfer(IoRequest & req) override;
 
 
+  bool read(uint8_t * buffer, size_t len, uint8_t sendvalue = 0xFF);
+  bool write(const uint8_t * buffer, size_t len);
   bool write_then_read(const uint8_t * write_buffer, size_t write_len, uint8_t * read_buffer, size_t read_len, uint8_t sendvalue = 0xFF);