Problem with I2C in LPCExpresso 1347 - STATUS BUSY

grzegorzwarchol — Wed, 03 Jan 2018 11:51:28 GMT

Hello,

I have LPCExpresso 1347 board and I want to run I2C0.

So far I have this part of code, and everything looks ok, and should working but my problem is that When I want to transmit byte Program stops and wait in function lines:

while (*stat == I2C_STATUS_BUSY) {

if (Chip_I2C_IsStateChanged(id)) {

Chip_I2C_MasterStateHandler(id);

}

In function Chip_I2C_EventHandlerPolling.

On Oscyloscope I can see that on both pins I means pin0_4 and pin0_5 are in high state. There is no CLK and Data signal at all.

Below I include my code.

Thank you very much if anybody know what it could be !

static void Init_I2C_PinMux(void)

{

Chip_IOCON_PinMux(LPC_IOCON, 0, 4, IOCON_MODE_INACT, IOCON_FUNC1);

Chip_IOCON_PinMux(LPC_IOCON, 0, 5, IOCON_MODE_INACT, IOCON_FUNC1);

}

static void i2c_state_handling(I2C_ID_T id)

{

if (Chip_I2C_IsMasterActive(id)) {

Chip_I2C_MasterStateHandler(id);

} else {

Chip_I2C_SlaveStateHandler(id);

}

static void i2c_set_mode(I2C_ID_T id, int polling)

{

if(!polling) {

mode_poll &= ~(1 << id);

Chip_I2C_SetMasterEventHandler(id, Chip_I2C_EventHandler);

NVIC_EnableIRQ(I2C0_IRQn);

} else {

mode_poll |= 1 << id;

NVIC_DisableIRQ(I2C0_IRQn);

Chip_I2C_SetMasterEventHandler(id, Chip_I2C_EventHandlerPolling);

}

static void i2c_app_init(I2C_ID_T id, int speed)

{

Init_I2C_PinMux()

/* Initializ I2C */

Chip_I2C_Init(id);

Chip_I2C_SetClockRate(id, speed);

/* Set default mode to interrupt */

i2c_set_mode(id, 1);

}

int main(void) {

....

i2c_app_init(I2C0, SPEED_100KHZ);

while(1) {

unsigned char temp_i2c_send[2];

unsigned char adress = 0xA1;

temp_i2c_send[0] = 0x11;

Chip_I2C_MasterSend(I2C0, adress, temp_i2c_send, 1);

}

return 0 ;

}

Re: Problem with I2C in LPCExpresso 1347 - STATUS BUSY

kerryzhou — Fri, 05 Jan 2018 06:31:12 GMT

Hi Grzegorz Warchol,

Do you write a 1 to PRESETCTRL register before you access I2C peripherals?

If not, please add this code before you initialize the I2C module:

Chip_SYSCTL_DeassertPeriphReset(RESET_I2C0); //before accessing the I2C peripherals, ensure the reset signal to the I2C are deasserted.

I have test our lpcopen code for LPC1347, it also lack this code, after add the above code, I can make it works, I checked the I2C bus on my side, it already have the data, but I didn't add the slaver, so I2C will have NACK.

I attached the lpcopen I2C code which works in my side.

This is the I2C bus wave:

Wish it helps you!

Have a great day,
Kerry

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
----------------------------------------------------------------------------------------------------------------------

topic Problem with I2C in LPCExpresso 1347 - STATUS BUSY in LPC Microcontrollers

Problem with I2C in LPCExpresso 1347 - STATUS BUSY

Re: Problem with I2C in LPCExpresso 1347 - STATUS BUSY