I'd like to use this example to solve it.
This is an example of lpuart, and I want to solve it using interrupt method.
I am using keil uVisun5 program
I am using mpas-ks22.
/*
* The Clear BSD License
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* Copyright 2016-2017 NXP
* All rights reserved.
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* of conditions and the following disclaimer.
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* software without specific prior written permission.
*
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "board.h"
#include "fsl_lpuart.h"
#include "fsl_device_registers.h"
#include "pin_mux.h"
#include "clock_config.h"
/*******************************************************************************
* Definitions
******************************************************************************/
/* UART instance and clock */
#define DEMO_LPUART LPUART0
#define DEMO_LPUART_CLKSRC kCLOCK_PllFllSelClk
#define DEMO_LPUART_CLK_FREQ CLOCK_GetFreq(kCLOCK_PllFllSelClk)
#define DEMO_LPUART_IRQn LPUART0_IRQn
#define DEMO_LPUART_IRQHandler LPUART0_IRQHandler
/*! @brief Ring buffer size (Unit: Byte). */
#define DEMO_RING_BUFFER_SIZE 16
/*! @brief Ring buffer to save received data. */
/*******************************************************************************
* Prototypes
******************************************************************************/
/*******************************************************************************
* Variables
******************************************************************************/
uint8_t g_tipString[] =
"Lpuart functional API interrupt example\r\nBoard receives characters then sends them out\r\nNow please input:\r\n";
/*
Ring buffer for data input and output, in this example, input data are saved
to ring buffer in IRQ handler. The main function polls the ring buffer status,
if there are new data, then send them out.
Ring buffer full: (((rxIndex + 1) % DEMO_RING_BUFFER_SIZE) == txIndex)
Ring buffer empty: (rxIndex == txIndex)
*/
uint8_t demoRingBuffer[DEMO_RING_BUFFER_SIZE];
volatile uint16_t txIndex; /* Index of the data to send out. */
volatile uint16_t rxIndex; /* Index of the memory to save new arrived data. */
/*******************************************************************************
* Code
******************************************************************************/
void DEMO_LPUART_IRQHandler(void)
{
uint8_t data;
/* If new data arrived. */
if ((kLPUART_RxDataRegFullFlag)&LPUART_GetStatusFlags(DEMO_LPUART))
{
data = LPUART_ReadByte(DEMO_LPUART);
/* If ring buffer is not full, add data to ring buffer. */
if (((rxIndex + 1) % DEMO_RING_BUFFER_SIZE) != txIndex)
{
demoRingBuffer[rxIndex] = data;
rxIndex++;
rxIndex %= DEMO_RING_BUFFER_SIZE;
}
}
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
__DSB();
#endif
}
/*!
* @brief Main function
*/
int main(void)
{
lpuart_config_t config;
BOARD_InitPins();
BOARD_BootClockHSRUN();
CLOCK_SetLpuart0Clock(0x1U); /* PLLFLLSEL is used as LPUART */
/*
* config.baudRate_Bps = 115200U;
* config.parityMode = kLPUART_ParityDisabled;
* config.stopBitCount = kLPUART_OneStopBit;
* config.txFifoWatermark = 0;
* config.rxFifoWatermark = 0;
* config.enableTx = false;
* config.enableRx = false;
*/
LPUART_GetDefaultConfig(&config);
config.baudRate_Bps = BOARD_DEBUG_UART_BAUDRATE;
config.enableTx = true;
config.enableRx = true;
LPUART_Init(DEMO_LPUART, &config, DEMO_LPUART_CLK_FREQ);
/* Send g_tipString out. */
LPUART_WriteBlocking(DEMO_LPUART, g_tipString, sizeof(g_tipString) / sizeof(g_tipString[0]));
/* Enable RX interrupt. */
LPUART_EnableInterrupts(DEMO_LPUART, kLPUART_RxDataRegFullInterruptEnable);
EnableIRQ(DEMO_LPUART_IRQn);
while (1)
{
/* Send data only when LPUART TX register is empty and ring buffer has data to send out. */
while ((kLPUART_TxDataRegEmptyFlag & LPUART_GetStatusFlags(DEMO_LPUART)) && (rxIndex != txIndex))
{
LPUART_WriteByte(DEMO_LPUART, demoRingBuffer[txIndex]);
txIndex++;
txIndex %= DEMO_RING_BUFFER_SIZE;
}
}
}
Thank you very much for your reply.
However,I tried as you taught me, but the code didn't work properly.
And I don't understand why "demoRingBuffer[0]" goes into if (demoRingBuffer[0]==0x30). I'd appreciate it if you let me know.
#include "board.h"
#include "fsl_lpuart.h"
#include "fsl_device_registers.h"
#include "pin_mux.h"
#include "clock_config.h"
/*******************************************************************************
* Definitions
******************************************************************************/
/* UART instance and clock */
#define DEMO_LPUART LPUART0
#define DEMO_LPUART_CLKSRC kCLOCK_PllFllSelClk
#define DEMO_LPUART_CLK_FREQ CLOCK_GetFreq(kCLOCK_PllFllSelClk)
#define DEMO_LPUART_IRQn LPUART0_IRQn
#define DEMO_LPUART_IRQHandler LPUART0_IRQHandler
/*! @brief Ring buffer size (Unit: Byte). */
#define DEMO_RING_BUFFER_SIZE 16
/*! @brief Ring buffer to save received data. */
/*******************************************************************************
* Prototypes
******************************************************************************/
/*******************************************************************************
* Variables
******************************************************************************/
uint8_t g_tipString[] =
"Lpuart functional API interrupt example\r\nBoard receives characters then sends them out\r\nNow please input:\r\n";
uint8_t hello_tipString[] ="hello";
uint8_t world_tipString[] ="world";
/*
Ring buffer for data input and output, in this example, input data are saved
to ring buffer in IRQ handler. The main function polls the ring buffer status,
if there are new data, then send them out.
Ring buffer full: (((rxIndex + 1) % DEMO_RING_BUFFER_SIZE) == txIndex)
Ring buffer empty: (rxIndex == txIndex)
*/
uint8_t demoRingBuffer[DEMO_RING_BUFFER_SIZE];
volatile uint16_t txIndex; /* Index of the data to send out. */
volatile uint16_t rxIndex; /* Index of the memory to save new arrived data. */
/*******************************************************************************
* Code
******************************************************************************/
void DEMO_LPUART_IRQHandler(void)
{
uint8_t data;
/* If new data arrived. */
if ((kLPUART_RxDataRegFullFlag)&LPUART_GetStatusFlags(DEMO_LPUART))
{
data = LPUART_ReadByte(DEMO_LPUART);
/* If ring buffer is not full, add data to ring buffer. */
if (((rxIndex + 1) % DEMO_RING_BUFFER_SIZE) != txIndex)
{
demoRingBuffer[rxIndex] = data;
rxIndex++;
rxIndex %= DEMO_RING_BUFFER_SIZE;
}
}
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
__DSB();
#endif
}
/*!
* @brief Main function
*/
int main(void)
{
lpuart_config_t config;
BOARD_InitPins();
BOARD_BootClockHSRUN();
CLOCK_SetLpuart0Clock(0x1U); /* PLLFLLSEL is used as LPUART */
/*
* config.baudRate_Bps = 115200U;
* config.parityMode = kLPUART_ParityDisabled;
* config.stopBitCount = kLPUART_OneStopBit;
* config.txFifoWatermark = 0;
* config.rxFifoWatermark = 0;
* config.enableTx = false;
* config.enableRx = false;
*/
LPUART_GetDefaultConfig(&config);
config.baudRate_Bps = BOARD_DEBUG_UART_BAUDRATE;
config.enableTx = true;
config.enableRx = true;
LPUART_Init(DEMO_LPUART, &config, DEMO_LPUART_CLK_FREQ);
/* Send g_tipString out. */
LPUART_WriteBlocking(DEMO_LPUART, g_tipString, sizeof(g_tipString) / sizeof(g_tipString[0]));
/* Enable RX interrupt. */
LPUART_EnableInterrupts(DEMO_LPUART, kLPUART_RxDataRegFullInterruptEnable);
EnableIRQ(DEMO_LPUART_IRQn);
while (1)
{
/* Send data only when LPUART TX register is empty and ring buffer has data to send out. */
while ((kLPUART_TxDataRegEmptyFlag & LPUART_GetStatusFlags(DEMO_LPUART)) && (rxIndex != txIndex))
{
LPUART_WriteByte(DEMO_LPUART, demoRingBuffer[txIndex]);
txIndex++;
txIndex %= DEMO_RING_BUFFER_SIZE;
if(demoRingBuffer[0]==0x30)LPUART_WriteBlocking(DEMO_LPUART, hello_tipString, sizeof(hello_tipString) / sizeof(hello_tipString[0]));
else LPUART_WriteBlocking(DEMO_LPUART, world_tipString, sizeof(world_tipString) / sizeof(world_tipString[0]));
}
}
}
