Added datasheet and touch template

discovery/src/ll_touch.c

@@ -1,6 +1,102 @@
 #include "ll_touch.h"
 
-bool ll_touch_init() {
+void ll_touch_read(const u16 RegisterStartAddress, const u8 NumberOfRegisters, u16 *DataBuffer, const u16 OffsetInBuffer)
-    return false;
+{
+  u16 ControlValue;
+  u8 i,j, RegisterIndex;
+  u16 InputValue;
+  
+  ControlValue = 0xE400 | (RegisterStartAddress & 0x03FF);                      // Create the 16-bit header
+  
+  for (i=0;i<100;i++);                                                          // delay
+
+  //Write out the control word
+  GPIO_ResetBits(GPIOA, GPIO_Pin_4);                                            // CS low
+  SPI_I2S_SendData(SPI1, ControlValue);
+  while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET);  
+  while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
+  InputValue = SPI_I2S_ReceiveData(SPI1);                                       // Read dummy
+
+  //Copy each register in the buffer contiguously.
+  //Read data in.
+  for (RegisterIndex=0; RegisterIndex<NumberOfRegisters; RegisterIndex++){
+    SPI_I2S_SendData(SPI1, 0xFFFF);
+    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET); 
+    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
+    InputValue = SPI_I2S_ReceiveData(SPI1);                                     // read data
+    *(DataBuffer+OffsetInBuffer+RegisterIndex)=(u16)InputValue;
+  }
+
+  GPIO_SetBits(GPIOA, GPIO_Pin_4);                                              // CS high
+  for (j=0;j<5;j++);                                                            // delay
+}
+
+void ll_touch_send_cmd(const u16 RegisterAddress, const u8 NumberOfRegisters, u16 *DataBuffer, const u8 OffsetInBuffer)
+{
+  u16 ControlValue;
+  u16 ValueToWrite;
+  u16 RegisterIndex;
+  u8 j;
+  
+  ControlValue = 0xE000 | (RegisterAddress & 0x03FF);                           //Create the 16-bit header
+
+  //Write out the control word
+  GPIO_ResetBits(GPIOA, GPIO_Pin_4);                                            // CS low
+  SPI_I2S_SendData(SPI1, ControlValue);
+  while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET);  
+  while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
+
+  //And then the data
+  for (RegisterIndex=0; RegisterIndex<NumberOfRegisters; RegisterIndex++){
+    ValueToWrite= *(DataBuffer+RegisterIndex+OffsetInBuffer);
+    SPI_I2S_SendData(SPI1, ValueToWrite);
+    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET); 
+    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
+  }
+
+  GPIO_SetBits(GPIOA, GPIO_Pin_4);                                              // CS high
+  for (j=0;j<5;j++);                                                            // delay
+}
+
+bool ll_touch_init() 
+{
+    // init structures
+    SPI_InitTypeDef     SPI_SPI1_InitStructure;
+    GPIO_InitTypeDef    GPIOSPI1_InitStructure;
+
+    // enable gpio clock    TODO: Check if not done already
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
+    // enable spi clock     TODO: Check if this is the correct one
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
+
+    GPIOSPI1_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;     // 5 = SPI1_SCK, 6 = SPI1_MISO, 7 = SPI1_MOSI
+    GPIOSPI1_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+    GPIOSPI1_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_Init(GPIOA, &GPIOSPI1_InitStructure);
+
+    GPIOSPI1_InitStructure.GPIO_Pin = GPIO_Pin_4;                               // 4 = SPI1_CS
+    GPIOSPI1_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
+    GPIOSPI1_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_Init(GPIOA, &GPIOSPI1_InitStructure);
+
+    // clear spi initialisation
+    SPI_I2S_DeInit(SPI1);
+
+    // fill spi init structure
+    SPI_SPI1_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
+    SPI_SPI1_InitStructure.SPI_Mode = SPI_Mode_Master;
+    SPI_SPI1_InitStructure.SPI_DataSize = SPI_DataSize_16b;
+    SPI_SPI1_InitStructure.SPI_CPOL = SPI_CPOL_High;
+    SPI_SPI1_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
+    SPI_SPI1_InitStructure.SPI_NSS = SPI_NSS_Soft;
+    SPI_SPI1_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
+    SPI_SPI1_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
+    SPI_SPI1_InitStructure.SPI_CRCPolynomial = 7;  
+
+    // init spi
+    SPI_Init(SPI1, &SPI_SPI1_InitStructure);  
+    SPI_Cmd(SPI1, ENABLE);
+
+    return true;
 }