Diff: DeviceI2C.c

Revision:

156:e68ee0bcdcda

Child:

161:efd949e8d536

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DeviceI2C.c	Mon May 09 20:03:26 2016 +0000
@@ -0,0 +1,157 @@
+#include "Device.h"
+
+//I2C Control Set Register
+#define I2CONSET_I2EN  0x0000040
+#define I2CONSET_AA    0x0000004
+#define I2CONSET_SI    0x0000008
+#define I2CONSET_STO   0x0000010
+#define I2CONSET_STA   0x0000020
+//I2C Control clear Register
+#define I2CONCLR_AAC   0x0000004
+#define I2CONCLR_SIC   0x0000008
+#define I2CONCLR_STAC  0x0000020
+#define I2CONCLR_I2ENC 0x0000040
+//I2C SCL Duty Cycle High Reg
+#define I2SCLH_SCLH    0x00000080 //High
+#define I2SCLL_SCLL    0x00000080 //Low
+//Address
+#define I2C_A_ADDRESS  0x0000005E //address of slave potentiometer A (table 6-2 of pot's manual)
+#define I2C_B_ADDRESS  0x0000005C //address of slave potentiometer B (table 6-2 of pot's manual)
+#define I2C_WRITE_CMD  0x00000000 //address of wiper0 register in memory map
+//Timeout
+#define I2C_TIMEOUT    1000
+
+extern Device device;
+
+//
+//Warning!!!
+//  Different LPC17xx.h versions declare different I2C registers names:
+//    LPC_I2C0->CONCLR (Keil?)/ LPC_I2C0->I2CONCLR (mbed)
+//    ...
+//
+
+void InitI2CWithDefaults(void){
+  device.controller.I2C.settings.trigger = 1000;
+}
+
+void InitI2C(void) {
+  device.controller.I2C.state.CON0 = 0;
+  device.controller.I2C.state.buffer[0] = I2C_A_ADDRESS;
+  device.controller.I2C.state.buffer[1] = I2C_WRITE_CMD;
+  device.controller.I2C.state.buffer[2] = device.detector.settings.a;
+  device.controller.I2C.state.buffer[3] = I2C_B_ADDRESS;
+  device.controller.I2C.state.buffer[4] = I2C_WRITE_CMD;
+  device.controller.I2C.state.buffer[5] = device.detector.settings.b;
+  device.controller.I2C.state.position = 0;
+  device.controller.I2C.state.counter = 0;
+  device.controller.I2C.state.trigger = device.controller.I2C.settings.trigger;
+  
+  LPC_SC->PCONP |= (1 << 7);//I2C0 on
+  //LPC_SC->PCONP |= (1 << 19);//I2C1 on
+
+  // set PIO0.27 and PIO0.28 to I2C0 SDA and SCK
+  // function to 01 on both SDA and SCK
+  LPC_PINCON->PINSEL1 &= ~0x03C00000; //P0.27 - SDA
+  LPC_PINCON->PINSEL1 |= 0x01400000;  //P0.28 - SCK
+  
+  LPC_I2C0->CONCLR = I2CONCLR_AAC | I2CONCLR_SIC | I2CONCLR_STAC | I2CONCLR_I2ENC; //Master mode
+  //LPC_I2C0->I2CONCLR = I2CONCLR_AAC | I2CONCLR_SIC | I2CONCLR_STAC | I2CONCLR_I2ENC; //Master mode
+
+  LPC_I2C0->SCLL   = I2SCLL_SCLL; // - счетчик scl low time period
+  //LPC_I2C0->I2SCLL   = I2SCLL_SCLL; // - счетчик scl low time period
+  LPC_I2C0->SCLH   = I2SCLH_SCLH; // - счетчик scl high time period
+  //LPC_I2C0->I2SCLH   = I2SCLH_SCLH; // - счетчик scl high time period
+  
+  LPC_I2C0->CONSET = I2CONSET_I2EN; //включение интерфейса I2C
+  //LPC_I2C0->I2CONSET = I2CONSET_I2EN; //включение интерфейса I2C
+  
+  device.controller.I2C.state.CON0 = LPC_I2C0->CONSET & (~LPC_I2C0->CONCLR);
+  //device.controller.I2C.state.CON0 = LPC_I2C0->I2CONSET & (~LPC_I2C0->I2CONCLR);
+}
+
+void DeviceI2CTransmit(void) {
+  if (!device.controller.I2C.state.enabled) return;                   //Transmission disabled, go away
+
+  device.controller.I2C.state.counter++;
+  if (device.controller.I2C.state.counter > device.controller.I2C.state.trigger){//Time out, go away
+    device.controller.I2C.state.counter = 0;
+    device.controller.I2C.state.enabled = 0;
+    LPC_I2C0->CONSET = I2CONSET_STO;                     //Set Stop flag
+    //LPC_I2C0->I2CONSET = I2CONSET_STO;                     //Set Stop flag
+    LPC_I2C0->CONCLR = I2CONCLR_AAC | I2CONCLR_SIC | I2CONCLR_STAC;
+    //LPC_I2C0->I2CONCLR = I2CONCLR_AAC | I2CONCLR_SIC | I2CONCLR_STAC;
+    return;
+  }
+  
+  if (!(LPC_I2C0->CONSET & I2CONSET_SI)) return;         //State of I2C bus has not been changed
+  //if (!(LPC_I2C0->I2CONSET & I2CONSET_SI)) return;         //State of I2C bus has not been changed
+
+  uint32_t StatValue = LPC_I2C0->STAT;
+  //uint32_t StatValue = LPC_I2C0->I2STAT;
+  switch ( StatValue ) {
+    //Start condition issued (write data for the first potentiometer) 
+    case 0x08:
+      device.controller.I2C.state.position = 0;                       //Init buffer position
+      device.controller.I2C.state.counter = 0;                 //Init countdown
+      LPC_I2C0->DAT = device.controller.I2C.state.buffer[device.controller.I2C.state.position++];  //Send address
+      //LPC_I2C0->I2DAT = device.controller.I2C.state.buffer[device.controller.I2C.state.position++];  //Send address
+      LPC_I2C0->CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC); //Clear interrupt bit and start bit
+      //LPC_I2C0->I2CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC); //Clear interrupt bit and start bit
+    break;
+    
+    //Repeated started is issued (write data for the second potentiometer) 
+    case 0x10:
+      LPC_I2C0->DAT = device.controller.I2C.state.buffer[device.controller.I2C.state.position++];  //Send address
+      //LPC_I2C0->I2DAT = device.controller.I2C.state.buffer[device.controller.I2C.state.position++];  //Send address
+      LPC_I2C0->CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC); //Clear interrupt bit and start bit
+      //LPC_I2C0->I2CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC); //Clear interrupt bit and start bit
+    break;
+
+    //ACK after slave address reading
+    case 0x18:
+      LPC_I2C0->DAT = device.controller.I2C.state.buffer[device.controller.I2C.state.position++];  //Send another byte
+      //LPC_I2C0->I2DAT = device.controller.I2C.state.buffer[device.controller.I2C.state.position++];  //Send another byte
+      LPC_I2C0->CONCLR = I2CONCLR_SIC;                   //Clear interrupt bit
+      //LPC_I2C0->I2CONCLR = I2CONCLR_SIC;                   //Clear interrupt bit
+    break;
+
+    //ACK after data byte
+    case 0x28:
+      if  (device.controller.I2C.state.position == I2C_BUFFER_LENGTH) {                   //Data transmission finished
+        device.controller.I2C.state.enabled = 0;
+        LPC_I2C0->CONSET = I2CONSET_STO;                 //Set Stop flag
+        //LPC_I2C0->I2CONSET = I2CONSET_STO;                 //Set Stop flag
+       //Output.Str.Cnt_Dif = 300;
+      } else if (device.controller.I2C.state.position == 3) {
+       LPC_I2C0->CONSET = I2CONSET_STA;
+       //LPC_I2C0->I2CONSET = I2CONSET_STA;
+       //Output.Str.Cnt_Dif = 200;
+      } else {
+        LPC_I2C0->DAT = device.controller.I2C.state.buffer[device.controller.I2C.state.position++];//Send another byte   
+        //LPC_I2C0->I2DAT = device.controller.I2C.state.buffer[device.controller.I2C.state.position++];//Send another byte   
+        //Output.Str.Cnt_Dif = 100;
+      }
+      LPC_I2C0->CONCLR = I2CONCLR_SIC;                   //Clear interrupt bit
+      //LPC_I2C0->I2CONCLR = I2CONCLR_SIC;                   //Clear interrupt bit
+    break;
+
+    //No acknoledgement after address transmitting
+    case 0x20:
+    //No acknoledgement after data block transmitting
+    case 0x30:
+      LPC_I2C0->CONSET = I2CONSET_STO;                   //Set Stop flag
+      //LPC_I2C0->I2CONSET = I2CONSET_STO;                   //Set Stop flag
+      LPC_I2C0->CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC);
+      //LPC_I2C0->I2CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC);
+      device.controller.I2C.state.enabled = 0;                        //Disable transmission
+    break;
+  }
+}
+
+void StartI2CTransmission(void){
+  device.controller.I2C.state.position = 0;
+  device.controller.I2C.state.counter = I2C_TIMEOUT;
+  LPC_I2C0->CONSET = I2CONSET_STA; //Set start flag
+  //LPC_I2C0->I2CONSET = I2CONSET_STA; //Set start flag
+  device.controller.I2C.state.enabled = 1;      //Enable transmission
+}
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