It gives this response
And this code
Hi Yuanbin Zhou,
Please refer to our LPC1837 lpcopen code at first.
You can download the IAR and MDK lpcopen code for LPCxpresso 1837 board from this link:
http://www.nxp.com/assets/downloads/data/en/software/lpcopen_3_01_keil_iar_nxp_lpcxpresso_1837.zip
UART0 code is in folder: lpcopen_3_01_keil_iar_nxp_lpcxpresso_1837\LPC43xx_18xx\prj_xpresso1837\iar\periph_uart
The default uart0 pin is using : P6_4 as UART0_TXD, P2_1 as UART0_RXD.
If you want to use P2_0 as UART0_TXD, you can modify the Board_UART_Init function in board.c like this:
Then build the lib and the uart project again.
This is test result with lpcxpresso 1837:
Wish it helps you!
If you still have question after using our official code, please let me know.
Have a great day,
Kerry
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Hi Yuanbin Zhou,
Please follow my step, and try again to build the project.
1. Open folder:lpcopen_3_01_keil_iar_nxp_lpcxpresso_1837\LPC43xx_18xx\prj_xpresso1837\iar\periph_examples
2.Build lib_lpc_board at first, then build lib_lpc_chip， at last build uart.
Your problem is caused by the lib, you didn't build the lib at first.
Have a great day,
Kerry
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Hello Yuanbin Zhou,
Sorry for my later reply.
Actually, the simple code you also can refer to the lpcopen code.
I have modify the lpcopen code like this:
#include "chip.h"
#include "board.h"
/*****************************************************************************
* Private types/enumerations/variables
****************************************************************************/
#define UARTNum 0
#define LPC_UART LPC_USART0
#define UARTx_IRQn USART0_IRQn
int main(void)
{
unsigned int i,j;
SystemCoreClockUpdate();
Board_Init();
Board_UART_Init(LPC_UART);
Chip_UART_Init(LPC_UART);
Chip_UART_SetBaud(LPC_UART, 115200);
Chip_UART_ConfigData(LPC_UART, UART_LCR_WLEN8 | UART_LCR_SBS_1BIT); /* Default 8-N-1 */
/* Enable UART Transmit */
Chip_UART_TXEnable(LPC_UART);
while(1)
{
for(i=0;i<100;i++) for(j=0;j<65535;j++);
while((Chip_UART_ReadLineStatus(LPC_USART0) & UART_LSR_THRE) != 0)
LPC_USART0->THR = (uint32_t)0X55;
}
}
It is just send 0X55 with 115200bps in UART0, PIO2_0 and PIO2-1.
I also attached my test project for your reference, and the following picture is the test result:
Wish it helps you!
Have a great day,
Kerry
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HI Yuanbin Zhou,
This is the build result on my side, no errors:
My MDK version is V5.23.
Your result turns out that you are building sdmmc.
Please build the lib at first, take care, the MDK should choose the according lib, then left click, choose the set as active project, then build.
Please build the two lib, and uart project again with my method.
Have a great day,
Kerry
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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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