Hi folks,
I am running the sample examples from lpcopen_2_18_lpcxpresso_nxp_lpcxpresso_1837, I see the UART receive function is not working. I have connected FTDI UART to usb cable, and connected the RX, TX & GND lines to U0_TXD, U0_RXD and GND lines.
I am able to see the following prints on Gtkterm/Cutecom
LPC18xx/43xx UART example using ring buffers
Press a key to echo it back or ESC to quit
But when I enter any key on the keyboard it is not able to receive.
Instead I went to use UART1, it worked fine with the following modifications.
Change it in uart_rb.c file of periph_uart_rb project
#if (defined(BOARD_NXP_LPCXPRESSO_4337) || defined(BOARD_NXP_LPCXPRESSO_1837))
| #define LPC_UARTX | LPC_UART1 |
| #define UARTx_IRQn | UART1_IRQn |
| #define UARTx_IRQHandler | UART1_IRQHandler |
#endif
In board.c file I have added code to do pin muxing based on the requested UART port
void Board_UART_Init(LPC_USART_T *pUART)
{
if (pUART == LPC_USART0) {
Chip_SCU_PinMuxSet(0x6, 4, (SCU_MODE_INACT | SCU_MODE_FUNC2)); /* P6,4 : UART0_TXD */
Chip_SCU_PinMuxSet(0x2, 1, (SCU_MODE_INACT | SCU_MODE_INBUFF_EN | SCU_MODE_ZIF_DIS | SCU_MODE_FUNC1));/* P2.1 : UART0_RXD */
}else {
Chip_SCU_PinMuxSet(0x1, 13, (SCU_MODE_INACT | SCU_MODE_FUNC1)); /* P1.13 : UART1_TXD */
Chip_SCU_PinMuxSet(0x1, 14, (SCU_MODE_INACT | SCU_MODE_INBUFF_EN | SCU_MODE_ZIF_DIS | SCU_MODE_FUNC1));/* P1.14 : UART1_RXD */
}
}
After the above modification I am able to send the data over UART, I have used U1_TXD, U1_RXD & GND pins on the RDK for connecting to FTDI UART to USB cable.
Thanks & Regards,
Vamshi G.
