topic Re: A version of i2c_int_k_fb.c without reg_addr in MQX Software Solutions

A version of i2c_int_k_fb.c without reg_addr

huishao2 — Tue, 23 Sep 2014 23:19:02 GMT

Hi-

In thread MQX 4.0 I2C Locks Up, i2c_int_k_fb.c is used to replace interrupt based I2C driver to resolve lock up problem. Question is, is there a version of this driver that does NOT need to configure register address like the highlighted below (from AN4652)? My I2C device doesn't have a register inside for access. It only receives simply read and write without need to specify register index.

ioctl(file_iic0, IO_IOCTL_I2C_SET_BAUD, &param);

i2c_buf_tx.dst_addr = 0x50; // The I2C slave address

i2c_buf_tx.reg_addr = 0; // You may view this as a register

// address or a command to slave.

i2c_buf_rx.dst_addr = 0x50; // The same as above, for receiving

i2c_buf_rx.reg_addr = 0; // The same as above, for receiving

for(i=0;i<8;i++) // initialize data

i2c_buf_tx.data[i] = 0xb0+i;

while(1)

{

printf("---------------------\n");

// send 4 bytes to slave

len = fwrite(&i2c_buf_tx, 1, 4, file_iic0);

Re: A version of i2c_int_k_fb.c without reg_addr

soledad — Mon, 06 Oct 2014 19:44:56 GMT

Hi Hui Shao,

Did you check the i2c driver that is included in MQX? You can find more information about this driver in the Freescale MQX™ RTOS I/O Drivers User’s Guide chapter 12. (C:\Freescale\Freescale_MQX_4_1\doc\mqx)

In addition you can find some examples at the path: C:\Freescale\Freescale_MQX_4_1\mqx\examples

Have a great day,
Sol

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Re: A version of i2c_int_k_fb.c without reg_addr

huishao2 — Mon, 06 Oct 2014 20:17:25 GMT

Thanks Sol! It has been worked around by using the register address as a configuration byte.

Hui