UART0, UART1 and I2C0 utilization and Initialization

[mexco]

Hi, I need to use UART0, UART1 and I2C0 in my application. I initialized these in overlay file (attached). When, debug is run, it is observed that the I2C binding is not successful see attached image file. I am using UART0 and UART1 in asynchrounous mode.  The zypher.dts fie also is attached. 

8176.bms_nrf5340_cpuapp.overlay5023.zephyr.dts  

[mexco]

Hello, I studied about Peripheral Resource Sharing. I could not find method to switch shared resources between competetive peripherals alernatively. UART1 and I2C0 share same address space and only one should be enabled at a time. Did, you find any ways to multiplex such pripherals ? I need to send the data to UART1 and to I2C0 alternatively and never need both at time. What is metod to use these alteranatively ? 

[Sigurd Hellesvik]

Hi

Have you tried to disable UART1 in software when using I2C0?

Regards,
Sigurd Hellesvik

[mexco]

Yes, I tried to initializae the I2C0 peripheral using

void init_i2c_master()
{
dev_i2c = device_get_binding("I2C_0");
if (dev_i2c == NULL) {
printk("Failed to get I2C0 binding\n");
return;
}
}

after disable of UART1 using  

void disable_uart1(){
NRF_UARTE0->TASKS_STOPTX = 1;
NRF_UARTE0->TASKS_STOPRX = 1;
}

but, I2C initilaize fail, when run Debug .. though build and Compile is successful.

[Sigurd Hellesvik]

Hi

Could you post the error message you receive?

To get more debug information, set the following configurations in prj.conf:

CONFIG_RESET_ON_FATAL_ERROR=n
CONFIG_LOG=y
CONFIG_THREAD_NAME=y

Regards,
Sigurd Hellesvik

[mexco]

Hello, I tried after adding the configurations in prj.conf, but I2C0 binding is not successful.

Please, test the following Code:

Fullscreen peripheral.txt Download

//************ Add to prj.conf file ******
CONFIG_SERIAL=y
CONFIG_UART_ASYNC_API=y
CONFIG_RESET_ON_FATAL_ERROR=n
CONFIG_LOG=y
CONFIG_THREAD_NAME=y
//***************add to the overlay file
&uart0{
    current-speed = <115200>;
};
&uart1{
current-speed = <9600>;
status = "okay";
};
&i2c0{
  status = "okay";
  clock-frequency = < 400 >;
};

//***************************************
static const struct device *wifi_uart;
static const struct device *bms_uart;
//*************************************
void init_i2c_master()
{
  dev_i2c = device_get_binding("I2C_0");
  if (dev_i2c == NULL) {
		printk("Failed to get I2C0 binding\n");
		return;        
	}
}
void wifi_uart_init(void)
{
        
	wifi_uart = device_get_binding("UART_0");
	if (wifi_uart == NULL) {
		printk("Failed to get UART0 binding\n");
		return;        
	}
}
void bms_uart_init(void)
{
        
	bms_uart = device_get_binding("UART_1");
	if (bms_uart == NULL) {
		printk("Failed to get UART1 binding\n");
		return;        
	}
}
void disable_uart1(){
        NRF_UARTE0->TASKS_STOPTX = 1;
        NRF_UARTE0->TASKS_STOPRX = 1;
}

void enable_uart1(){
        NRF_UARTE0->TASKS_STARTRX = 1;
        NRF_UARTE3->TASKS_STARTRX = 1;
}

void main()
{
	wifi_uart_init();
	bms_uart_init();
        disable_uart1();// disable UART1 to enable I2C0
        init_i2c_master();// I2C0 enable 
}