How can I use UART0 of LPC4078?

[at-nakano]

I do write a simple code to test UART0 of LPC4078 on our original board, but it does not work...

Codes for initialize UART0 are shown below:
void Uart0Init(void)
{
UART_CFG_Type UARTConfigStruct;
UART_FIFO_CFG_Type UARTFIFOConfigStruct;

UART_ConfigStructInit(&UARTConfigStruct);

UARTConfigStruct.Baud_rate = 115200;
UART_Init(UART_0, &UARTConfigStruct);

UART_FIFOConfigStructInit(&UARTFIFOConfigStruct);
UART_FIFOConfig(UART_0, &UARTFIFOConfigStruct);

UART_TxCmd(UART_0, ENABLE);

UART_IntConfig(UART_0, UART_INTCFG_RBR, ENABLE);

NVIC_SetPriority(UART0_IRQn, ((0x02<<3)|0x01));

NVIC_EnableIRQ(UART0_IRQn);
}
And the port 0.2 and 0.3 are set by codes below:
PINSEL_ConfigPin(0, 2, 1);
PINSEL_ConfigPin(0, 3, 1);

Based on the initialize code shown above, I tried to send some characters via ring buffer, but any characters sent to terminal.
I added "UART_SendByte(UART_0, 'A'); to simplify the debug work, but the result was same.

I believe "UART_SendByte" is very simple command and should be work, so there must be an error in my setup/initialization code...

The connection diagram of my debug environment are
PC USB
MCUXpresso ----- LPC-Link2 --------------- 4078board
Serial |
Tera Term ----- USB-Serial Converter ---------|

I did run the sample code "periph_uart_rb" and it was work, so I believe the hardware itself is correct.

Regards,

[Alice_Yang]

Hello Atsuki Nakano,

Please check whether enable the UART clock and GPIO (UART TX/RX) clock.

You can refer to the UART demo under LPCopen for LPC4088:

LPCOpen Software for LPC40XX | NXP 

Have a great day,
TIC

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[at-nakano]

Thank you Alice!

You mean, calling "Chip_Clock_EnablePeriphClock" from "Chip_UART_Init" in "uart_17xx_40xx.c"?
The "Chip_Clock_EnablePeriphClock" in "clock_17xx_40xx.c" and set the bit 3 of "LPC_SYSCTL->PCONP".
If so, "UART_Init" in "lpc_uart.c" calls "CLKPWR_ConfigPPWR" in "lpc_clkpwr.c" and certainly set the bit 3 of "LPC_SC->PCONP".
Finally, the value of "LPC_SC->PCONP" is "0x042887de", and  the address of "LPC_SYSCTL->PCONP" and "LPC_SC->PCONP" is same, just "0x400fc000", so I think clock for UART is enabled.

Do you have any other idea or am I looking at the wrong place?

Regards,

[Alice_Yang]

Hello Atsuki Nakano,

The easy way is compare your code with example code.

Or  you can directly config based on the example, thus can save your time to development.

BR

Alice

[at-nakano]

Hi Alice,

Thank you for your support.

I'll look into the differences between sample code and my one again.

Regards,

Atsuki