AB&T
This is a simple library for the STMPE610 touchscreen controller used by the Adafruit 2.8" TFT LCD shield
Diff: SPI_STMPE610.cpp
- Revision:
- 0:b5211f22867b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SPI_STMPE610.cpp Wed May 26 19:08:27 2021 +0000
@@ -0,0 +1,197 @@
+//********************************************************************************************
+// *
+// This software is distributed as an example, "AS IS", in the hope that it could *
+// be useful, WITHOUT ANY WARRANTY of any kind, express or implied, included, but *
+// not limited, to the warranties of merchantability, fitness for a particular *
+// purpose, and non infringiment. In no event shall the authors be liable for any *
+// claim, damages or other liability, arising from, or in connection with this software. *
+// *
+//********************************************************************************************/
+
+#include "SPI_STMPE610.h"
+
+
+#define REG_SYS_CTRL1 0x03 // reset control
+
+#define REG_SYS_CTRL2 0x04 // clock control
+
+#define REG_SPI_CFG 0x08 // SPI interface configuration
+
+#define REG_CFG 0x41 // touchscreen controller configuration
+ //
+#define CFG_1SAMPLE 0x00 //
+#define CFG_2SAMPLE 0x40 //
+#define CFG_4SAMPLE 0x80 //
+#define CFG_8SAMPLE 0xC0 //
+ //
+#define CFG_DELAY_10US 0x00 //
+#define CFG_DELAY_50US 0x08 //
+#define CFG_DELAY_100US 0x10 //
+#define CFG_DELAY_500US 0x18 //
+#define CFG_DELAY_1MS 0x20 //
+#define CFG_DELAY_5MS 0x28 //
+#define CFG_DELAY_10MS 0x30 //
+#define CFG_DELAY_50MS 0x38 //
+ //
+#define CFG_SETTLE_10US 0x00 //
+#define CFG_SETTLE_100US 0x01 //
+#define CFG_SETTLE_500US 0x02 //
+#define CFG_SETTLE_1MS 0x03 //
+#define CFG_SETTLE_5MS 0x04 //
+#define CFG_SETTLE_10MS 0x05 //
+#define CFG_SETTLE_50MS 0x06 //
+#define CFG_SETTLE_100MS 0x07 //
+
+#define REG_CTRL 0x40 // touchscreen controller control
+ //
+#define CTRL_EN 0x01 //
+#define CTRL_XY 0x02 //
+
+#define REG_FIFO_SIZE 0x4C // FIFO size
+
+#define REG_FIFO_STA 0x4B // FIFO control/status
+
+#define REG_DATA_X 0x4D // X point value
+#define REG_DATA_Y 0x4F // Y point value
+
+
+
+#define X_OFFSET 180
+#define X_GAIN 0.090
+
+#define Y_OFFSET 207
+#define Y_GAIN 0.066
+
+
+SPI_STMPE610::SPI_STMPE610(PinName mosi, PinName miso, PinName sclk, PinName cs) :
+ m_spi(mosi, miso, sclk), m_cs(cs, 1)
+{
+
+ m_spi.frequency(1000000) ; // SPI mode 0 - 8 bit - 1MHz
+ m_spi.format(8, 0); //
+
+ Write8(REG_SYS_CTRL1, 0x02) ; // soft reset
+ #if (MBED_MAJOR_VERSION != 2) //
+ ThisThread::sleep_for(10ms); //
+ #else //
+ wait_ms(10); //
+ #endif //
+
+ Write8(REG_SYS_CTRL2, 0x00) ; // turn on clocks
+
+ Write8(REG_SPI_CFG, 0x04); // autoincrement on
+
+ // touchscreen parameters
+ Write8(REG_CFG, CFG_8SAMPLE | CFG_DELAY_1MS | CFG_SETTLE_5MS ) ;
+
+ Write8(REG_CTRL, CTRL_XY | CTRL_EN); // enable the touchscreen
+ // we don't use pressure reporting
+}
+
+
+ //--- write an 8 bits register -----
+ //
+void SPI_STMPE610::Write8(uint8_t Addr, uint8_t Data)
+{
+ m_cs = 0;
+ m_spi.write(0x7F & Addr);
+ m_spi.write(Data);
+ m_cs = 1;
+}
+
+
+ //--- read an 8 bits register ------
+ //
+uint8_t SPI_STMPE610::Read8(uint8_t Addr)
+{
+ uint8_t Data;
+
+ m_cs = 0;
+ m_spi.write(0x80 | Addr);
+ Data = m_spi.write(0x00);
+ m_cs = 1;
+
+ return(Data);
+}
+
+ //--- read a 16 bits register ------
+ //
+uint16_t SPI_STMPE610::Read16(uint8_t Addr)
+{
+ uint16_t Data;
+
+ m_cs = 0;
+ m_spi.write(0x80 | Addr);
+ Data = m_spi.write(0x80);
+ Data = (Data << 8) & 0xFF00;
+ Data |= m_spi.write(0x00);
+ m_cs = 1;
+
+ return(Data);
+}
+
+
+ //--- get a raw point --------------
+ //
+bool SPI_STMPE610::GetRawPoint(uint16_t *X, uint16_t *Y)
+{
+ if(Read8(REG_FIFO_SIZE)) // if some data is available in the fifo
+ {
+ *Y = Read16(REG_DATA_X); // read X value
+ *X = Read16(REG_DATA_Y); // read Y value
+ // X and Y are exchanged because the display is horizontal
+
+ Write8(REG_FIFO_STA, 0x01); // reset the fifo
+ Write8(REG_FIFO_STA, 0x00); // " "
+
+ //printf("X raw %d\n", *X);
+ //printf("Y raw %d\n\n", *Y);
+
+ return true; // exit with a valid point
+ }
+
+ else
+ {
+ return false; // exit with no valid point
+ }
+}
+
+
+ //--- get a normalized point -------
+ //
+bool SPI_STMPE610::GetPoint(uint16_t *X, uint16_t *Y)
+{
+ uint16_t RawX, RawY;
+
+ if(GetRawPoint (&RawX, &RawY)) // if a point is available
+ {
+ RawX = RawX - X_OFFSET; // remove the offset
+ if ((int16_t)RawX < 0) //
+ RawX = 0; //
+ //
+ RawY = RawY - Y_OFFSET; //
+ if ((int16_t)RawY < 0) //
+ RawY = 0; //
+
+ *X = X_GAIN * (float)RawX; // apply the gain factor
+ *Y = Y_GAIN * (float)RawY; //
+
+ *Y = 240 - *Y; // we want the 0,0 point in the upper left corner
+ if ((int16_t)*Y < 0) // so Y must be inverted
+ *Y = 0; //
+
+ //printf("X %d\n", *X);
+ //printf("Y %d\n\n", *Y);
+
+ return true; // exit with a valid point
+ }
+
+ else
+ {
+ return false; // exit with no valid point
+ }
+}
+
+
+
+
