Initial commit

external/CMSIS_5/CMSIS/DoxyGen/Driver/src/I2C_Demo.c

@@ -0,0 +1,132 @@
+#include "Driver_I2C.h"
+ 
+#define EEPROM_I2C_ADDR       0x51      /* EEPROM I2C address */
+ 
+/* I2C driver instance */
+extern ARM_DRIVER_I2C            Driver_I2C0;
+static ARM_DRIVER_I2C *I2Cdrv = &Driver_I2C0;
+ 
+static volatile uint32_t I2C_Event;
+ 
+/* I2C Signal Event function callback */
+void I2C_SignalEvent (uint32_t event) {
+ 
+  /* Save received events */
+  I2C_Event |= event;
+ 
+  /* Optionally, user can define specific actions for an event */
+ 
+  if (event & ARM_I2C_EVENT_TRANSFER_INCOMPLETE) {
+    /* Less data was transferred than requested */
+  }
+ 
+  if (event & ARM_I2C_EVENT_TRANSFER_DONE) {
+    /* Transfer or receive is finished */
+  }
+ 
+  if (event & ARM_I2C_EVENT_ADDRESS_NACK) {
+    /* Slave address was not acknowledged */
+  }
+ 
+  if (event & ARM_I2C_EVENT_ARBITRATION_LOST) {
+    /* Master lost bus arbitration */
+  }
+ 
+  if (event & ARM_I2C_EVENT_BUS_ERROR) {
+    /* Invalid start/stop position detected */
+  }
+ 
+  if (event & ARM_I2C_EVENT_BUS_CLEAR) {
+    /* Bus clear operation completed */
+  }
+ 
+  if (event & ARM_I2C_EVENT_GENERAL_CALL) {
+    /* Slave was addressed with a general call address */
+  }
+ 
+  if (event & ARM_I2C_EVENT_SLAVE_RECEIVE) {
+    /* Slave addressed as receiver but SlaveReceive operation is not started */
+  }
+ 
+  if (event & ARM_I2C_EVENT_SLAVE_TRANSMIT) {
+    /* Slave addressed as transmitter but SlaveTransmit operation is not started */
+  }
+}
+
+/* Read I2C connected EEPROM (event driven example) */
+int32_t EEPROM_Read_Event (uint16_t addr, uint8_t *buf, uint32_t len) {
+  uint8_t a[2];
+ 
+  a[0] = (uint8_t)(addr >> 8);
+  a[1] = (uint8_t)(addr & 0xFF);
+
+  /* Clear event flags before new transfer */
+  I2C_Event = 0U;
+ 
+  I2Cdrv->MasterTransmit (EEPROM_I2C_ADDR, a, 2, true);
+ 
+  /* Wait until transfer completed */
+  while ((I2C_Event & ARM_I2C_EVENT_TRANSFER_DONE) == 0U);
+  /* Check if all data transferred */
+  if ((I2C_Event & ARM_I2C_EVENT_TRANSFER_INCOMPLETE) != 0U) return -1;
+ 
+  /* Clear event flags before new transfer */
+  I2C_Event = 0U;
+ 
+  I2Cdrv->MasterReceive (EEPROM_I2C_ADDR, buf, len, false);
+ 
+  /* Wait until transfer completed */
+  while ((I2C_Event & ARM_I2C_EVENT_TRANSFER_DONE) == 0U);
+  /* Check if all data transferred */
+  if ((I2C_Event & ARM_I2C_EVENT_TRANSFER_INCOMPLETE) != 0U) return -1;
+ 
+  return 0;
+}
+
+/* Read I2C connected EEPROM (pooling example) */
+int32_t EEPROM_Read_Pool (uint16_t addr, uint8_t *buf, uint32_t len) {
+  uint8_t a[2];
+ 
+  a[0] = (uint8_t)(addr >> 8);
+  a[1] = (uint8_t)(addr & 0xFF);
+ 
+  I2Cdrv->MasterTransmit (EEPROM_I2C_ADDR, a, 2, true);
+ 
+  /* Wait until transfer completed */
+  while (I2Cdrv->GetStatus().busy);
+  /* Check if all data transferred */
+  if (I2Cdrv->GetDataCount () != len) return -1;
+ 
+  I2Cdrv->MasterReceive (EEPROM_I2C_ADDR, buf, len, false);
+ 
+  /* Wait until transfer completed */
+  while (I2Cdrv->GetStatus().busy);
+  /* Check if all data transferred */
+  if (I2Cdrv->GetDataCount () != len) return -1;
+ 
+  return 0;
+}
+ 
+/* Initialize I2C connected EEPROM */
+int32_t EEPROM_Initialize (bool pooling) {
+  int32_t status;
+  uint8_t val;
+ 
+  if (pooling == true) {
+    I2Cdrv->Initialize (NULL);
+  } else {
+    I2Cdrv->Initialize (I2C_SignalEvent);
+  }
+  I2Cdrv->PowerControl (ARM_POWER_FULL);
+  I2Cdrv->Control      (ARM_I2C_BUS_SPEED, ARM_I2C_BUS_SPEED_FAST);
+  I2Cdrv->Control      (ARM_I2C_BUS_CLEAR, 0);
+ 
+  /* Check if EEPROM can be accessed */
+  if (pooling == true) {
+    status = EEPROM_Read_Pool (0x00, &val, 1);
+  } else {
+    status = EEPROM_Read_Event (0x00, &val, 1);
+  }
+ 
+  return (status);
+}