TM4C123BH6PM: TM4C123BH6PM

Hi,
Are you in VDD3ON mode to retain the IO states? If you are in VDD3ON mode then all outputs driven high are supposed to remain driven. What was the state of PC5 before entering hibernate and what voltage were you measuring while in hibernation? Can you disconnect PC5 pin from your UART device and confirm that it is floating in hibernate mode?

Hi
the pin is configured to be TX of uart1
during the configure I am using UARTFlowControlSet(UART1_BASE ,0X00004000|0X00008000);
if I remove this command the pin retention is working and the pin stay in High position during hibernate.
when using this flowcontrol command the pin is 3 state during hibernate how can I undo this flowcontrol before hibernation

thanks
Zahiz

The TX and CTS shares the same pin.  When in flow control mode the CTS is an input to the MCU. Is the MCU the DTE or the DCE?

Hi
OK is it possible before entering hibernate to change this pin to GPIO output
I tried to use
GPIOPinTypeGpioOutput
then
GPIOPadConfigSet
the
GPIOPinWrite
but it didn't help
it stay in input state

thanks
Zahiz

Hi,
I think somehow when you are in flow control mode it overrides to be in input mode. However, it should be no different than other pins for which you configured to be in inputs mode, these pins will just remain in input mode prior and during hibernation mode. How are you using the UART1? Do you need flow control at all?

Hi
Thanks for the prompt replay
it is working ok all the time exapt the fact that during hibernate I need it not to be input or 3 state
is it possible to exit from this flow control before entering hibernate and then on exit to renter flow control
if so what command should I use to stop the flow control

thanks
Zahiz

Can you try UARTFlowControlSet(UART1_BASE ,UART_FLOWCONTROL_NONE) prior to entering hibernation mode?

Hi
Sorry it didn't help
I tried changing the mode using UART_FLOWCONTROL_NONE (0X00000000)
didn't have any effect
when I remove the flaw control command in Hibernate it retain the port state (in my case TX "1")
if I use flow control command even with the FLOWCONTROL_NONE in hibernate it is 3 state or input

thanks
Zahiz

What about changing to UART_FLOWCONTROL_NONE and then followed with the pin configured for output like what you did earlier.

Hi
I did try that
this didn't work in hibernate portc pin6 is 3 state

--------------------------------------------------------------------------------------------------
GPIOPinConfigure(GPIO_PC4_U1RX);
GPIOPinConfigure(GPIO_PC5_U1TX);
GPIOPinConfigure(HCI_PIN_CONFIGURE_UART_RTS);
GPIOPinConfigure(HCI_PIN_CONFIGURE_UART_CTS);

GPIOPinTypeUART(HCI_UART_GPIO_BASE, HCI_UART_PIN_RX | HCI_UART_PIN_TX);
GPIOPinTypeUART(HCI_UART_RTS_GPIO_BASE, HCI_UART_PIN_RTS);
GPIOPinTypeUART(HCI_UART_CTS_GPIO_BASE, HCI_UART_PIN_CTS);
int i=0;
while(i<1000000)
{
i++;
}

UARTFlowControlSet(UART1_BASE, 0x00000000);

i=0;
while(i<1000000)
{
i++;
}
ROM_GPIOPinTypeGPIOOutput(GPIO_PORTC_BASE,GPIO_PIN_5);
ROM_GPIOPinWrite(GPIO_PORTC_BASE, GPIO_PIN_5, GPIO_PIN_5);
testHibernate();
-------------------------------------------------------------------------------------------------------------

this version same without the UARTFlowControlSet in hibernate portc pin 6 is "1"
---------------------------------------------------------------------------------------------------------------------
GPIOPinConfigure(GPIO_PC4_U1RX);
GPIOPinConfigure(GPIO_PC5_U1TX);
GPIOPinConfigure(HCI_PIN_CONFIGURE_UART_RTS);
GPIOPinConfigure(HCI_PIN_CONFIGURE_UART_CTS);

GPIOPinTypeUART(HCI_UART_GPIO_BASE, HCI_UART_PIN_RX | HCI_UART_PIN_TX);
GPIOPinTypeUART(HCI_UART_RTS_GPIO_BASE, HCI_UART_PIN_RTS);
GPIOPinTypeUART(HCI_UART_CTS_GPIO_BASE, HCI_UART_PIN_CTS);
int i=0;
while(i<1000000)
{
i++;
}

// UARTFlowControlSet(UART1_BASE, 0x00000000);

i=0;
while(i<1000000)
{
i++;
}

ROM_GPIOPinTypeGPIOOutput(GPIO_PORTC_BASE,GPIO_PIN_5);
ROM_GPIOPinWrite(GPIO_PORTC_BASE, GPIO_PIN_5, GPIO_PIN_5);
testHibernate();
---------------------------------------------------------------------------------------------------------------------------------------------

Hi
I even tried changing the UART Flowcontrol with
HWREG(0X4000D030)=0X0;
OR
HWREG(0X4000D030)=0X300;
in all cases in hibernate portc pin 5 is in 3 state
only if I remove those commands the port is "1"

Zahiz

Hi,
Can you try below before you change the pin to output pin?
1. Can you call UARTFlowControlGet() to see if the flow control is truly disabled?
2. Can you disable UART by calling UARTDisable()?
3. Can you try SysCtlPeripheralDisable(SYSCTL_PERIPH_UART1)?