Posted on July 24, 2008 at 13:11I'm trying to activate I2C module on STR750 with the code below.
I can't manage to generate start and I get to wait forever for Busy status bit.
Can any help ?
Attached code;
#include ''75x_mrcc.h''
#include ''75x_i2c.h''
int I2CDriverInit(void)
{
I2C_InitTypeDef I2C_InitStruct;
GPIO_InitTypeDef GPIO_InitStructure;
/* Initialize pins - STR750 reference manual page 86*/
/* Configure the I2C SCL alternate function */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_Init(GPIO0, &GPIO_InitStructure);
/* Configure the I2C SDA as input floating */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIO0, &GPIO_InitStructure);
GPIO_WriteBit(GPIO0, GPIO_Pin_8, Bit_RESET);
GPIO_WriteBit(GPIO0, GPIO_Pin_9, Bit_RESET);
GPIO_WriteBit(GPIO0, GPIO_Pin_8, Bit_SET);
GPIO_WriteBit(GPIO0, GPIO_Pin_9, Bit_SET);
/* Configure the UART2_Tx as alternate function */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_Init(GPIO0, &GPIO_InitStructure);
/* Configure the UART2_Rx as input floating */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIO0, &GPIO_InitStructure);
GPIO_WriteBit(GPIO0, GPIO_Pin_8, Bit_SET);
GPIO_WriteBit(GPIO0, GPIO_Pin_9, Bit_SET);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_Init(GPIO0, &GPIO_InitStructure);
/* Configure the I2C SDA as input floating */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIO0, &GPIO_InitStructure);
GPIO_WriteBit(GPIO0, GPIO_Pin_8, Bit_SET);
GPIO_WriteBit(GPIO0, GPIO_Pin_9, Bit_SET);
/* Configure the UART2_Tx as alternate function */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_Init(GPIO0, &GPIO_InitStructure);
/* Configure the UART2_Rx as input floating */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIO0, &GPIO_InitStructure);
/* enable HW */
/* reset HW */
I2C_DeInit();
/* Enable the I2C Clock. */
MRCC_PeripheralClockConfig( MRCC_Peripheral_I2C, ENABLE );
/* init I2C structure */
I2C_StructInit(&I2C_InitStruct);
/* I2C initialization */
I2C_InitStruct.I2C_GeneralCall = I2C_GeneralCall_Disable;
I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;
I2C_InitStruct.I2C_CLKSpeed = I2CSPEED;
I2C_InitStruct.I2C_OwnAddress = I2COWNADDR;
I2C_Cmd(ENABLE);
/* init I2C HW */
I2C_Init(&I2C_InitStruct);
return 0;
}
test()
{
/* generate start condition */
I2C_GenerateSTART(ENABLE);
/* test on EV5 and clear it */
rprintf(''W 4 5\n'');
I2CEventCheck(I2C_EVENT_MASTER_MODE_SELECT);
/* send EEPROM address for read */
rprintf(''S A %x\n'', *ptr);
I2C_Send7bitAddress(*ptr, I2C_MODE_RECEIVER);
/* test on EV6 and clear it */
rprintf(''W 4 6\n'');
I2CEventCheck(I2C_EVENT_MASTER_MODE_SELECTED);
/* clear EV6 by setting again the PE bit */
I2C_Cmd(ENABLE);
}
main()
{
int I2CDriverInit(void);
test();
}
