Diff: XPT2046/XPT2046.h

Revision:

0:b036dfb76a75

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/XPT2046/XPT2046.h	Tue Apr 03 20:08:18 2018 +0000
@@ -0,0 +1,111 @@
+#ifndef __XPT2046_H
+#define __XPT2046_H
+
+#include "mbed.h"
+#include "system.h"
+#include "interfaces.h"
+
+
+#define BIT(__N)  (uint8_t)(1 << (__N))
+
+#define TP_IRQ_PIN         PB_3
+#define TP_CS_PIN          PB_5
+#define SD_CS_PIN          PB_4
+
+#define __XPT2046_CS_OUT()      tp_cs_pin(TP_CS_PIN)
+#define __XPT2046_CS_SET()      tp_cs_pin.write(HIGH)
+#define __XPT2046_CS_CLR()      tp_cs_pin.write(LOW)
+#define __XPT2046_CS_DISABLE()  __XPT2046_CS_SET()
+
+#define __XPT2046_IRQ_IN()      tp_irq_pin(TP_IRQ_PIN, PullUp)
+#define __XPT2046_IRQ_READ()    tp_irq_pin.read()
+
+#define __SD_CS_DISABLE()       do { \
+                                    DigitalOut sd_cs_pin(SD_CS_PIN); \
+                                    sd_cs_pin.write(HIGH); \
+                                } while (0)
+                                
+#define __XPT2046_WRITE_BYTE(__DATA)  HwInterfaces::getHwInterface<SPI__1>().handle().write(__DATA)
+
+
+
+
+
+
+
+
+
+
+class XPT
+{
+
+public:
+
+    XPT();
+    
+    inline uint8_t xpt2046_write_byte(uint8_t chData)
+    {
+        uint8_t x = 0;
+        HwInterfaces::getHwInterface<SPI__1>().handle().write(x);
+        return __XPT2046_WRITE_BYTE(chData);
+    }
+
+    uint16_t xpt2046_read_ad_value(uint8_t chCmd)
+    {
+        uint16_t hwData = 0;
+    
+        __XPT2046_CS_CLR();
+        xpt2046_write_byte(chCmd);
+        hwData = xpt2046_write_byte(0x00);
+        hwData <<= 8;
+        hwData |= xpt2046_write_byte(0x00);
+        hwData >>= 4;
+       __XPT2046_CS_SET();
+        
+        return hwData;
+    }
+    
+#define READ_TIMES  5
+#define LOST_NUM    1
+    uint16_t xpt2046_read_average(uint8_t chCmd)
+    {
+        uint8_t i, j;
+        uint16_t hwbuffer[READ_TIMES], hwSum = 0, hwTemp;
+
+        for (i = 0; i < READ_TIMES; i ++) {
+            hwbuffer[i] = xpt2046_read_ad_value(chCmd);
+        }
+        for (i = 0; i < READ_TIMES - 1; i ++) {
+            for (j = i + 1; j < READ_TIMES; j ++) {
+                if (hwbuffer[i] > hwbuffer[j]) {
+                    hwTemp = hwbuffer[i];
+                    hwbuffer[i] = hwbuffer[j];
+                    hwbuffer[j] = hwTemp;
+                }
+            }
+        }
+        for (i = LOST_NUM; i < READ_TIMES - LOST_NUM; i ++) {
+            hwSum += hwbuffer[i];
+        }
+        hwTemp = hwSum / (READ_TIMES - 2 * LOST_NUM);
+
+        return hwTemp;
+    }
+    
+    void xpt2046_init(void);
+    void xpt2046_read_xy(uint16_t *phwXpos, uint16_t *phwYpos);
+    bool xpt2046_twice_read_xy(uint16_t *phwXpos, uint16_t *phwYpos);
+    
+private:
+    DigitalOut tp_cs_pin;
+    DigitalIn tp_irq_pin;
+};
+
+extern uint8_t g_chXcmd, g_chYcmd;
+extern XPT Xpt;
+
+#endif
+
+
+
+