Tool/software: TI-RTOS
I want a response from TI.
Currently, I have two EK-TM4C1294XL that I’m using to try out the uart in 9 bit mode.
EK1 is the master and EK2 is the peripheral.
Can you explain how to setup the UART9BitAddrSend and UART9BitAddrSet in the master and in the peripheral so there can be two way communication in 9 bit mode between EK1 and EK2. I want to see the 9 bit address match interrupt happen in both EK1 and EK2. Please use numeric examples for EK1 and EK2.
Thank you,
Priya
Here are the sections of code:
EK1 (master)
int
main(void)
{
ROM_UARTEnable(UART5_BASE);
ROM_UARTFIFODisable(UART5_BASE);
ROM_UART9BitEnable(UART5_BASE);
ROM_UART9BitAddrSet(UART5_BASE, 0x43, 0xFF); //x43 is the dummy peripheral address for EK2.
ROM_UART9BitAddrSend(UART5_BASE, 0x43);
//
// Enable the UART interrupt.
//
ROM_IntEnable(INT_UART5);
ROM_UARTIntEnable(UART5_BASE, UART_INT_9BIT | UART_INT_RX | UART_INT_RT);
void
UARTIntHandler(void)
{
uint32_t ui32Status;
//
// Get the interrrupt status.
//
ui32Status = UARTIntStatus(UART5_BASE, true);
//
// Clear the asserted interrupts.
//
ROM_UARTIntClear(UART5_BASE, ui32Status);
if ((UART_INT_RT & ui32Status) == UART_INT_RT){
while(ROM_UARTBusy(UART5_BASE))
{
// Do nothng
}
}
if ( ((UART_INT_RX & ui32Status) == UART_INT_RX )){
if(GPIOPinRead(GPIO_PORTN_BASE, GPIO_PIN_1))
{
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_1, 0);
}
else
{
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_1, 2);
}
}
if ( (UART_INT_9BIT & ui32Status) == UART_INT_9BIT ){
// Receive uart char
while(ROM_UARTCharsAvail(UART5_BASE))
{
//
// Read the next character from the UART and write it back to the UART.
//
ROM_UARTCharGetNonBlocking(UART5_BASE);
//uint32_t c = UARTCharGet(UART5_BASE);
//
// Blink the LED to show a character transfer is occuring.
//
if(GPIOPinRead(GPIO_PORTN_BASE, GPIO_PIN_1))
{
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_1, 0);
}
else
{
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_1, 2);
}
}
}
}
EK2 (peripheral)
int
main(void)
{
ROM_UARTEnable(UART5_BASE);
ROM_UART9BitEnable(UART5_BASE);
ROM_UART9BitAddrSet(UART5_BASE, 0x21, 0xFF);
//0x21 dummy address for master EK1
ROM_UART9BitAddrSend(UART5_BASE, 0x21);
ROM_UARTFIFODisable(UART5_BASE);
//
// Enable the UART interrupt.
//
ROM_IntEnable(INT_UART5);
ROM_UARTIntEnable(UART5_BASE, UART_INT_RT | UART_INT_RX | UART_INT_9BIT);
void
UARTIntHandler(void)
{
uint32_t ui32Status;
//
// Get the interrrupt status.
//
ui32Status = UARTIntStatus(UART5_BASE, true);
//
//
// Clear the asserted interrupts.
//
ROM_UARTIntClear(UART5_BASE, ui32Status);
if ((UART_INT_RT & ui32Status) == UART_INT_RT){
while(ROM_UARTBusy(UART5_BASE))
{
// Do nothng
}
}
if ( ((UART_INT_RX & ui32Status) == UART_INT_RX )){
if(GPIOPinRead(GPIO_PORTN_BASE, GPIO_PIN_1))
{
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_1, 0);
}
else
{
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_1, 2);
}
}
if ( ((UART_INT_9BIT & ui32Status) == UART_INT_9BIT)){
// Receive uart char
while(ROM_UARTCharsAvail(UART5_BASE))
{
//
// Read the next character from the UART //
ROM_UARTCharGetNonBlocking(UART5_BASE);
}
if(GPIOPinRead(GPIO_PORTN_BASE, GPIO_PIN_1))
{
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_1, 0);
}
else
{
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_1, 2);
}
RxComplete = 1;
}
}
Picture of setup (EK1 and EK2 powered separately).
Thank you,
Priya
