Diff: hal.cpp

Revision:

0:fa7450a43b99

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hal.cpp	Mon Dec 04 09:32:20 2017 +0000
@@ -0,0 +1,127 @@
+//
+// Filename: hal.cpp
+//
+// Flexbook Hardware Abstraction Layer.
+//
+
+#include "hal.h"
+
+#include "mcp23s17.h"
+
+#include "mbed.h"
+
+#include <stdio.h>
+
+// Initialisation values for MCP23S17 registers.
+uint8_t MCP23S17value[0x16] =
+{
+0x00, // IODIRA
+0x00, // IODIRB
+0xff, // IPOLA
+0x00, // IPOLB
+0x00, // GPINTENA
+0x00, // GPINTENB
+0x00, // DEFVALA
+0x00, // DEFVALB
+0x00, // INTCONA
+0x00, // INTCONB
+0x00, // IOCON1
+0x00, // IOCON2
+0x00, // GPPUA
+0x00, // GPPUB
+0x00, // INTFA
+0x00, // INTFB
+0x00, // INTCAPA
+0x00, // INTCAPB
+0x00, // GPIOA
+0x00, // GPIOB
+0x00, // OLATA
+0x00, // OLATB
+};
+
+namespace HAL {
+
+MCP23S17 &GetMCP23S17()
+{
+    // The MCP23S17 uses pins 5, 6, 7 (SPI MOSI, MISO, SCK) and 19 (CS).
+    static SPI spi(p5, p6, p7);
+    static DigitalOut cs(p19);
+    static MCP23S17 mcp23s17(0x00, spi, cs);
+
+    return mcp23s17;
+}
+
+// Initialise the HAL.
+void Initialise()
+{
+    // Setup MCP23S17 I/O expander.
+    for(unsigned int reg = 0; reg < sizeof(MCP23S17value); reg++)
+        GetMCP23S17().Write((REG_MCP23S17) reg, MCP23S17value[reg]);
+    
+    GetMCP23S17().Write(GPIOA, 0);
+    GetMCP23S17().Write(GPIOB, 0);
+}
+
+void EnablePowerToPages(Flexbook::PageType pages)
+{
+    // Power on the board(s).
+    GetMCP23S17().Write(GPIOB, pages);
+
+    // Wait for the power to stabilize.
+    wait(0.1);
+    
+    // Enable the I2C connection.
+    GetMCP23S17().Write(GPIOA, pages);   
+}
+
+Flexbook::PageType GetPageType()
+{
+    using namespace Flexbook;
+
+    static PageType lastype = Flexbook::PageType_PageNull;   
+
+    //printf("%x\n", GetMCP23S17().Read(GPIOA));
+
+    switch(GetMCP23S17().Read(GPIOA))
+    {
+        case 0:
+            break;
+            
+        //case PageType_PageSensor:    
+        case 0xFE:
+            lastype = PageType_PageSensor;
+            break;
+
+        case 0xF7:
+            lastype = PageType_PageDice;
+            break;
+
+        case PageType_PageOLED:
+            lastype = PageType_PageOLED;
+            break;
+
+        //case PageType_PageTouch:
+        case 0xFD:
+            lastype = PageType_PageTouch;
+            break;
+
+        case PageType_PageFlexEnable:
+            lastype = PageType_PageFlexEnable;
+            break;
+
+        case PageType_PageNFC:
+            lastype = PageType_PageNFC;
+            break;
+
+        default:
+            break;
+    }
+    
+    return lastype;
+}
+
+} // End HAL namespace.
+
+
+
+