STR750 I2C

[dany]

Posted on September 24, 2008 at 02:13

STR750 I2C

[dany]

Posted on July 24, 2008 at 13:11

I'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();

}

[rjohnweber]

Posted on September 24, 2008 at 02:13

I think your call to I2C_Send7bitAddress should have I2C_MODE_TRANSMITTER.

I2C_Send7bitAddress(*ptr, I2C_MODE_TRANSMITTER);