LPC4330_Xplorer board receiving data from UART1 using HC05/06 Bluetooth module

[nabeelfattah]

Hello,

Can some guide me please for how to receive data from UART1 and printed on the console?

I tried a lot but not successful. 

Regards

Nabeel

[Carlos_Mendoza]

Hi Nabeel,

I would recommend you to use the UART example that comes with the LPCOpen package as base for your project, this example shows how to use the UART in polling, interrupt, and DMA modes. You can download the LPCOpen package for the NGX Xplorer LPC4330 board from this link:

LPCOpen Software for LPC43XX|NXP 

Here is a document that you can use as guide to get started:

https://community.nxp.com/docs/DOC-332667 

Hope it helps!

Best Regards,
Carlos Mendoza
Technical Support Engineer

[nabeelfattah]

Hi Carlos,

First I would like thank you for your reply.

I already tried that example and tried again today.

This example is showing general use for the UARTs.

my problem is how to print the received data? because I do not know will be happen for the received data?

another question is how to remove unused UARs? because I am using UART1. when I removed other UARTs I got errors, tried to sort out the errors but it was very difficult for me, because tried a lot and spend more than one week without result.

Just to let you know that the BLE HC05 module is connected as the follwing:

BLE_Tx to LPC4330_Rx - GPIO1[7]

and

BLE_Rx to LPC4330_Tx - GPIO1[6]

I want to print the result on LPCXpresso console. which one is representing the received data on the example? 

How to express the code for printing?

printf("? \n");

Below is the code from LPCopen example:

// This example show how to use the UART in 3 modes : Polling, Interrupt and DMA

#include "chip.h"
#include "board.h"

/*****************************************************************************
* Private types/enumerations/variables
****************************************************************************/
#if (defined(BOARD_HITEX_EVA_1850) || defined(BOARD_HITEX_EVA_4350))
#define UARTNum 0

#elif (defined(BOARD_KEIL_MCB_1857) || defined(BOARD_KEIL_MCB_4357))
#define UARTNum 3

#elif (defined(BOARD_NGX_XPLORER_1830) || defined (BOARD_NGX_XPLORER_4330))
#define UARTNum 0

#elif defined(BOARD_NXP_LPCLINK2_4370)
#define UARTNum 2

#elif defined(BOARD_NXP_LPCXPRESSO_4337)
#define UARTNum 0

#else
#error No UART selected for undefined board
#endif

#if (UARTNum == 0)
#define LPC_UART LPC_USART0
#define UARTx_IRQn USART0_IRQn
#define UARTx_IRQHandler UART0_IRQHandler
#define _GPDMA_CONN_UART_Tx GPDMA_CONN_UART0_Tx
#define _GPDMA_CONN_UART_Rx GPDMA_CONN_UART0_Rx
#elif (UARTNum == 1)
#define LPC_UART LPC_UART1
#define UARTx_IRQn UART1_IRQn
#define UARTx_IRQHandler UART1_IRQHandler
#define _GPDMA_CONN_UART_Tx GPDMA_CONN_UART1_Tx
#define _GPDMA_CONN_UART_Rx GPDMA_CONN_UART1_Rx
#elif (UARTNum == 2)
#define LPC_UART LPC_USART2
#define UARTx_IRQn USART2_IRQn
#define UARTx_IRQHandler UART2_IRQHandler
#define _GPDMA_CONN_UART_Tx GPDMA_CONN_UART2_Tx
#define _GPDMA_CONN_UART_Rx GPDMA_CONN_UART2_Rx
#elif (UARTNum == 3)
#define LPC_UART LPC_USART3
#define UARTx_IRQn USART3_IRQn
#define UARTx_IRQHandler UART3_IRQHandler
#define _GPDMA_CONN_UART_Tx GPDMA_CONN_UART3_Tx
#define _GPDMA_CONN_UART_Rx GPDMA_CONN_UART3_Rx
#endif

/* Transmit and receive ring buffers */
STATIC RINGBUFF_T txring, rxring;

/* Ring buffer size */
#define UART_RB_SIZE 256

/* Transmit and receive buffers */
static uint8_t rxbuff[UART_RB_SIZE], txbuff[UART_RB_SIZE];

static uint8_t uartABStart[] = "Starting UART Auto-Baud - Press 'A' or 'a'! \n\r";
static uint8_t uartABComplete[] = "UART Auto-Baudrate synchronized! \n\r";

/* Uart Polling variables and functions declaration */
static uint8_t uartPolling_menu1[] = "Hello NXP Semiconductors \r\n";
static uint8_t uartPolling_menu2[] = "UART polling mode demo \r\n";
static uint8_t uartPolling_menu3[] = "\r\nUART demo terminated!";
static uint8_t uartPolling_menu4[] = "\r\nPress number 1-3 to choose UART running mode:\r\n"
"\t 1: Polling Mode \r\n"
"\t 2: Interrupt Mode \r\n"
"\t 3: DMA Mode \r\n";
static uint8_t uartPolling_menu5[] = "\r\nPolling mode is running now! Please press \'c\' and choose another mode \r\n";

/* Uart Interrupt variables and functions declaration */
static uint8_t uart_interrupt_menu[] =
"UART Interrupt mode demo ! \r\nPress '1' to '4' to display 4 menus \r\nPress 'x'to exit UART interrupt mode \r\n";
static uint8_t uart_interrupt_menu1[] = "UART interrupt menu 1 \r\n";
static uint8_t uart_interrupt_menu2[] = "UART interrupt menu 2 \r\n";
static uint8_t uart_interrupt_menu3[] = "UART interrupt menu 3 \r\n";
static uint8_t uart_interrupt_menu4[] = "UART interrupt menu 4 \r\n";
/* static uint8_t rxUartIntBuf[1]; */

#define DMA_TIMEOUT 0xA000000

/* DMA variables and functions declaration */
static uint8_t dmaChannelNumTx, dmaChannelNumRx;
static uint8_t uartDMA_menu[] = "Hello NXP Semiconductors (DMA mode)\r\n"
"UART DMA mode demo ! Please type 'hello NXP' to return\r\n";

static volatile uint32_t channelTC; /* Terminal Counter flag for Channel */
static volatile uint32_t channelTCErr;
static FunctionalState isDMATx = ENABLE;

/*****************************************************************************
* Public types/enumerations/variables
****************************************************************************/

/*****************************************************************************
* Private functions
****************************************************************************/

/* Initialize DMA for UART, enable DMA controller and enable DMA interrupt */
static void App_DMA_Init(void)
{
/* Initialize GPDMA controller */
Chip_GPDMA_Init(LPC_GPDMA);
/* Setting GPDMA interrupt */
NVIC_DisableIRQ(DMA_IRQn);
NVIC_SetPriority(DMA_IRQn, ((0x01 << 3) | 0x01));
NVIC_EnableIRQ(DMA_IRQn);
}

/* DeInitialize DMA for UART, free transfer channels and disable DMA interrupt */
static void App_DMA_DeInit(void)
{
Chip_GPDMA_Stop(LPC_GPDMA, dmaChannelNumTx);
Chip_GPDMA_Stop(LPC_GPDMA, dmaChannelNumRx);
NVIC_DisableIRQ(DMA_IRQn);
}

/* DMA routine for example_uart */
static void App_DMA_Test(void)
{
uint8_t receiveBuffer[16];

App_DMA_Init();
dmaChannelNumTx = Chip_GPDMA_GetFreeChannel(LPC_GPDMA, _GPDMA_CONN_UART_Tx);

isDMATx = ENABLE;
channelTC = channelTCErr = 0;
Chip_GPDMA_Transfer(LPC_GPDMA, dmaChannelNumTx,
(uint32_t) &uartDMA_menu[0],
_GPDMA_CONN_UART_Tx,
GPDMA_TRANSFERTYPE_M2P_CONTROLLER_DMA,
sizeof(uartDMA_menu));
while (!channelTC) {}

dmaChannelNumRx = Chip_GPDMA_GetFreeChannel(LPC_GPDMA, _GPDMA_CONN_UART_Rx);
isDMATx = DISABLE;
channelTC = channelTCErr = 0;
Chip_GPDMA_Transfer(LPC_GPDMA, dmaChannelNumRx,
_GPDMA_CONN_UART_Rx,
(uint32_t) &receiveBuffer[0],
GPDMA_TRANSFERTYPE_P2M_CONTROLLER_DMA,
10);
while (!channelTC) {}

isDMATx = ENABLE;
channelTC = channelTCErr = 0;
Chip_GPDMA_Transfer(LPC_GPDMA, dmaChannelNumTx,
(uint32_t) &receiveBuffer[0],
_GPDMA_CONN_UART_Tx,
GPDMA_TRANSFERTYPE_M2P_CONTROLLER_DMA,
10);
while (!channelTC) {}

App_DMA_DeInit();
}

/* Print Welcome Screen Menu subroutine by Interrupt mode */
static void Print_Menu_Interrupt(LPC_USART_T *UARTx)
{
uint32_t tmp;
uint8_t *pDat;

tmp = sizeof(uart_interrupt_menu);
pDat = (uint8_t *) &uart_interrupt_menu[0];
Chip_UART_SendRB(UARTx, &txring, pDat, tmp);
}

/* Initialize Interrupt for UART */
static void App_Interrupt_Init(void)
{
/* Enable UART Rx & line status interrupts */
/*
* Do not enable transmit interrupt here, since it is handled by
* UART_Send() function, just to reset Tx Interrupt state for the
* first time
*/
Chip_UART_IntEnable(LPC_UART, (UART_IER_RBRINT | UART_IER_RLSINT));

/* Before using the ring buffers, initialize them using the ring
buffer init function */
RingBuffer_Init(&rxring, rxbuff, 1, UART_RB_SIZE);
RingBuffer_Init(&txring, txbuff, 1, UART_RB_SIZE);

/* Enable Interrupt for UART channel */
/* Priority = 1 */
NVIC_SetPriority(UARTx_IRQn, 1);
/* Enable Interrupt for UART channel */
NVIC_EnableIRQ(UARTx_IRQn);
}

/* DeInitialize Interrupt for UART */
static void App_Interrupt_DeInit(void)
{
/* Disable UART Rx & line status interrupts */
Chip_UART_IntDisable(LPC_UART, (UART_IER_RBRINT | UART_IER_RLSINT));

/* Disable Interrupt for UART channel */
NVIC_DisableIRQ(UARTx_IRQn);
}

/* Interrupt routine for example_uart */
static void App_Interrupt_Test(void)
{
uint8_t isExit = 0, userInput;
int len;
App_Interrupt_Init();

/* Print out uart interrupt menu */
Print_Menu_Interrupt(LPC_UART);

while (!isExit) {
len = 0;
while (len == 0) {
len = Chip_UART_ReadRB(LPC_UART, &rxring, &userInput, 1);
}
if (userInput == '1') {
Chip_UART_SendRB(LPC_UART, &txring, (uint8_t *) &uart_interrupt_menu1[0], sizeof(uart_interrupt_menu1));
}
else if (userInput == '2') {
Chip_UART_SendRB(LPC_UART, &txring, (uint8_t *) &uart_interrupt_menu2[0], sizeof(uart_interrupt_menu2));
}
else if (userInput == '3') {
Chip_UART_SendRB(LPC_UART, &txring, (uint8_t *) &uart_interrupt_menu3[0], sizeof(uart_interrupt_menu3));
}
else if (userInput == '4') {
Chip_UART_SendRB(LPC_UART, &txring, (uint8_t *) &uart_interrupt_menu4[0], sizeof(uart_interrupt_menu4));
}
else if (( userInput == 'x') || ( userInput == 'X') ) {
isExit = 1;
}
}

App_Interrupt_DeInit();
}

/* Print Welcome menu by Polling mode */
static void Print_Menu_Polling(void)
{
Chip_UART_SendBlocking(LPC_UART, uartPolling_menu1, sizeof(uartPolling_menu1));
Chip_UART_SendBlocking(LPC_UART, uartPolling_menu2, sizeof(uartPolling_menu2));
Chip_UART_SendBlocking(LPC_UART, uartPolling_menu5, sizeof(uartPolling_menu5));
}

/*****************************************************************************
* Public functions
****************************************************************************/

/**
* @brief GPDMA interrupt handler sub-routine
* @return Nothing
*/
void DMA_IRQHandler(void)
{
uint8_t dmaChannelNum;
if (isDMATx) {
dmaChannelNum = dmaChannelNumTx;
}
else {
dmaChannelNum = dmaChannelNumRx;
}
if (Chip_GPDMA_Interrupt(LPC_GPDMA, dmaChannelNum) == SUCCESS) {
channelTC++;
}
else {
channelTCErr++;
}
}

/**
* @brief UART interrupt handler sub-routine
* @return Nothing
*/
void UARTx_IRQHandler(void)
{
Chip_UART_IRQRBHandler(LPC_UART, &rxring, &txring);
}

/**
* @brief Main UART program body
* @return Always returns -1
*/
int main(void)
{
FlagStatus exitflag;
uint8_t buffer[10];
int ret = 0;
int len;

SystemCoreClockUpdate();
Board_Init();
Board_UART_Init(LPC_UART);

#if !((defined(CHIP_LPC43XX) && defined(BOARD_KEIL_MCB_18574357) && UARTNum==3) || ((!(defined(CHIP_LPC43XX) && defined(BOARD_KEIL_MCB_18574357))) && UARTNum==0))
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);
#endif

/* Reset FIFOs, Enable FIFOs and DMA mode in UART */
Chip_UART_SetupFIFOS(LPC_UART, (UART_FCR_FIFO_EN | UART_FCR_RX_RS |
UART_FCR_TX_RS | UART_FCR_DMAMODE_SEL | UART_FCR_TRG_LEV0));

/* Enable UART End of Auto baudrate & Auto baudrate timeout interrupts */
Chip_UART_IntEnable(LPC_UART, (UART_IER_ABEOINT | UART_IER_ABTOINT));

/* preemption = 1, sub-priority = 1 */
NVIC_SetPriority(UARTx_IRQn, 1);
/* Enable Interrupt for UART0 channel */
NVIC_EnableIRQ(UARTx_IRQn);

/* Send UART Autobaud completed message */
Chip_UART_SendBlocking(LPC_UART, uartABStart, sizeof(uartABStart));

/* ---------------------- Auto baud rate section ----------------------- */
/* Start auto baudrate mode */
Chip_UART_ABCmd(LPC_UART, UART_ACR_MODE0, true, ENABLE);

/* Loop until auto baudrate mode complete */
while (Chip_UART_GetABEOStatus(LPC_UART) == RESET) {}

/* Send UART Autobaud completed message */
Chip_UART_SendBlocking(LPC_UART, uartABComplete, sizeof(uartABComplete));

/* Disable UART Interrupt */
NVIC_DisableIRQ(UARTx_IRQn);

/* Print welcome screen */
Print_Menu_Polling();

exitflag = RESET;
/* Read some data from the buffer */
while (exitflag == RESET) {
len = 0;
while (len == 0) {
len = Chip_UART_Read(LPC_UART, buffer, 1);
}
if (buffer[0] == 27) {
/* ESC key, set exit flag */
Chip_UART_SendBlocking(LPC_UART, uartPolling_menu3, sizeof(uartPolling_menu3));
ret = -1;
exitflag = SET;
}
else if (buffer[0] == 'c') {
Chip_UART_SendBlocking(LPC_UART, uartPolling_menu4, sizeof(uartPolling_menu4));
len = 0;
while (len == 0) {
len = Chip_UART_Read(LPC_UART, buffer, sizeof(buffer));
if ((buffer[0] != '1') && (buffer[0] != '2') && (buffer[0] != '3')) {
len = 0;
}
}
switch (buffer[0]) {
case '1': /* Polling Mode */
Chip_UART_SendBlocking(LPC_UART, uartPolling_menu5, sizeof(uartPolling_menu5));
break;

case '2': /* Interrupt Mode */
ret = 2;
/* Exitflag = SET; */
App_Interrupt_Test();
Print_Menu_Polling();
break;

case '3': /* DMA mode */
ret = 3;
App_DMA_Test();
Print_Menu_Polling();
break;
}
}
}

/* Wait for current transmission complete - THR must be empty */
while (Chip_UART_CheckBusy(LPC_UART) == SET) {}

/* DeInitialize UART0 peripheral */
Chip_UART_DeInit(LPC_UART);

return ret;
}