int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
{
I2cHandle = (I2C_TypeDef *)(obj->i2c);
int count;
if(!obj->is_setAddress)
{
if( I2C_Start(I2cHandle, address, I2C_WRITE_SA7) == ERROR )
{
return -1;
}
obj->is_setAddress = 1;
obj->ADDRESS = address;
}
else
{
I2C_Restart_Structure(I2cHandle, address, I2C_WRITE_SA7);
obj->ADDRESS = address;
}
for (count = 0; count < length; count++) {
i2c_byte_write(obj, data[count]);
}
// If not repeated start, send stop
if (stop) {
i2c_stop(obj);
}
return count;
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main()
{
int i;
/*System clock configuration*/
SystemInit();
/* UART0 and UART1 configuration*/
UART_StructInit(&UART_InitStructure);
/* Configure UART0 */
UART_Init(UART1,&UART_InitStructure);
printf("######## I2C EEPROM TEST #########\r\n");
/* I2C Init */
/* I2C confiugred as follow:
* - I2C master mode
* - I2C slave address : 0xA0
* - I2C Prescale : 0x61
* /If MCU clock is 20MHz and Prescale value is 0x61, SCL occurs 100KHz as clock.
* - I2C Timeout : 0xFFFF
*/
conf.mode = I2C_Master;
conf.slave_address = 0xA0;
conf.master.prescale = 0x61;
conf.master.timeout = 0xFFFF;
/* Cofigure I2C0 */
I2C_Init(I2C0, conf);
/* EEPROM Write Test*/
/* It can transmit up to 9data bytes to the EEPROM(24AA02) ( mem_address 1byte, data 8bytes ) */
if( I2C_Burst_Write(I2C0,conf.slave_address,&Transmit_Data[0],9,1) == -1 )
return -1;
/*It must be use the delay function between Write operation and Read operation */
I2C_Delay(0x000F0000);
/*I2C Core reset */
I2C_Reset(I2C0);
// EEPROM Read Test
/* I2C Start */
I2C_Start(I2C0,conf.slave_address,I2C_WRITE_SA7);
/* The memory address of EEPROM send to EEPROM and it wait the ack signal */
I2C_SendDataAck(I2C0,0x00);
/*Once the Slave address and memotu address are clocked in and
*acknowledged by the EEPROM, the W7500 must generate another start condition.*/
I2C_Restart_Structure(I2C0,conf.slave_address,I2C_READ_SA7);
/* EEPROM Read Test*/
for(i=0;i<MAX_SIZE;i++)
{
if(i != MAX_SIZE-1) Recv_Data[i] = I2C_ReceiveData(I2C0,0);
else Recv_Data[i] = I2C_ReceiveData(I2C0,1);
}
for(i=0;i<MAX_SIZE-2;i+=2)
printf("[%02d]:%02x, [%02d]:%02x\r\n",i,Recv_Data[i],i+1,Recv_Data[i+1]);
return 0;
}
int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
{
I2cHandle = (I2C_TypeDef *)(obj->i2c);
int count;
int value;
if(!obj->is_setAddress)
{
if( I2C_Start(I2cHandle, address, I2C_READ_SA7) == ERROR )
{
return -1;
}
obj->is_setAddress = 1;
obj->ADDRESS = address;
}
else
{
I2C_Restart_Structure(I2cHandle, address, I2C_READ_SA7);
obj->ADDRESS = address;
}
// Read all bytes
for (count = 0; count < (length-1); count++) {
if( (value = i2c_byte_read(obj, 0)) == -1) return value;
data[count] = (char)value;
}
if(stop){
if( (value = i2c_byte_read(obj, 1)) == -1) return value;
data[count] = (char)value;
}
else{
if( (value = i2c_byte_read(obj, 0)) == -1) return value;
data[count] = (char)value;
}
return count;
}
