Microcontroller S32K118 I2C protocol register configuration

[Eletronicc_23]

Hi friends, is a pleasure to be here. I am working with the protocol I2C using the microcontroller S32K118. I am working with a device calls KTS1622EUAA-TR that is a extenser of inputs and outputs. The good news that I2c fuction of the program lpi2c_master_s32k118 it is working because it reconigzed the device to write and read, but I want to work the registers of the device so the problem that I have here which the fuction that I can write to the registers of the device, the fuctions for it  are this:

status_t LPI2C_DRV_MasterSendData(uint32_t instance,
const uint8_t * txBuff,
uint32_t txSize,
bool sendStop)

status_t LPI2C_DRV_MasterSendDataBlocking(uint32_t instance,
const uint8_t * txBuff,
uint32_t txSize,
bool sendStop,
uint32_t timeout)

Another thing that I want to use for this is to read the state of the inputs and outputs of the device

status_t LPI2C_DRV_MasterReceiveData(uint32_t instance,
uint8_t * rxBuff,
uint32_t rxSize,
bool sendStop)

status_t LPI2C_DRV_MasterReceiveDataBlocking(uint32_t instance,
uint8_t * rxBuff,
uint32_t rxSize,
bool sendStop,
uint32_t timeout)

please let me know about it,

[Eletronicc_23]

ok for example if I want to write in int the register 0x06 to configurate all the pins of the port0 as input or output, how it will be using the function  LPI2C_DRV_MasterSendDataBlocking(uint32_t instance, const uint8_t * txBuff, uint32_t txSize, bool sendStop, uint32_t timeout)?

It will something like this, because I am not sure to send the information to the device

/* Definition of the data transfer size */
#define TRANSFER_SIZE (3u)

uint8_t buffer3[TRANSFER_SIZE]={0x05,0xFF};

LPI2C_DRV_MasterSendDataBlocking(INST_LPI2C1,buffer3,TRANSFER_SIZE, true, OSIF_WAIT_FOREVER);

Please let me know friends

Best Regards,

Rony Vargas

[danielmartynek]

Hi @Eletronicc_23,

The address of the device is sent automatically.

In this example, you need TRANSFER_SIZE = 2.

The tx_buffer should contain the address of the register and the data to be written to that register.

Please use a logic analyzer ot an oscilloscope to verify the transfer on the bus.

Regards,

Daniel

[Eletronicc_23]

Ok good, in this case to receive how will  be the example?, I understand if I send the register 0X00, it will send me back the state of the input to see how is the configuration of the Port depending the pin that I want to read. it is something like this:

#define RECEIVE_SIZE (2u)

uint8_t masterTxBuffer[TRANSFER_SIZE]={0x00};
uint8_t masterRxBuffer[TRANSFER_SIZE];

LPI2C_DRV_MasterSendDataBlocking(INST_LPI2C1, masterTxBuffer,RECEIVE_SIZE, true, OSIF_WAIT_FOREVER);

LPI2C_DRV_MasterReceiveDataBlocking(INST_LPI2C1, masterRxBuffer,RECEIVE_SIZE, true, OSIF_WAIT_FOREVER);

[danielmartynek]

The SendDataBlocking should not send the STOP condition in this case.

RECEIVE_SIZE should be 1 if you read just one register, but this depends on the Slave device, please refer to the datasheet of the device.

Regadrs,
Daniel

[Eletronicc_23]

ok in this case I want to read the input of PORT0 that is the register 0x00, so it will be like this my friend if I am not wrong:

#define RECEIVE_SIZE (1u)

uint8_t masterTxBuffer[ RECEIVE_SIZE]={0x00};
uint8_t masterRxBuffer[ RECEIVE_SIZE];

LPI2C_DRV_MasterSendDataBlocking(INST_LPI2C1, masterTxBuffer,RECEIVE_SIZE, false, OSIF_WAIT_FOREVER);

LPI2C_DRV_MasterReceiveDataBlocking(INST_LPI2C1, masterRxBuffer,RECEIVE_SIZE, true, OSIF_WAIT_FOREVER);

Best Regards

[danielmartynek]

HI @Eletronicc_23,

The KTS1622 datasheet specifies the format.

https://www.kinet-ic.com/uploads/KTS1622-04d.pdf

For example:

If you decide to use the blocking method, it should be something like this:

LPI2C_DRV_MasterSendDataBlocking(uint32_t instance, const uint8_t * txBuff, uint32_t txSize, bool sendStop, uint32_t timeout);

where txSize = 1 and sendStop = 0.

followed by

LPI2C_DRV_MasterReceiveDataBlocking(uint32_t instance, uint8_t * rxBuff, uint32_t rxSize, bool sendStop, uint32_t timeout);

where rxSize = 1 and sendStop = 1.

If you use the non-blocking method, you need to use this function to get the status of the transfer.

LPI2C_DRV_MasterGetTransferStatus(uint32_t instance, uint32_t *bytesRemaining);

Regards,

Daniel

[Eletronicc_23]

ok for example if I want to write in int the register 0x06 to configurate all the pins of the port0 as input or output, how it will be using the function  LPI2C_DRV_MasterSendDataBlocking(uint32_t instance, const uint8_t * txBuff, uint32_t txSize, bool sendStop, uint32_t timeout)?

It will something like this, because I am not sure to send the information to the device

/* Definition of the data transfer size */
#define TRANSFER_SIZE (3u)

uint8_t buffer3[TRANSFER_SIZE]={0x05,0xFF};

LPI2C_DRV_MasterSendDataBlocking(INST_LPI2C1,buffer3,TRANSFER_SIZE, true, OSIF_WAIT_FOREVER);

Please let me know friends

Best Regards,

Rony Vargas