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