UART receive DMA with ISR

anil23 · ‎2007-09-28

Posted on September 28, 2007 at 11:05

nanuradha · ‎2011-05-17

Posted on May 17, 2011 at 09:34

hai iamanil,

we are using MCBSTR9 Evaluation Board.

now we are facing a problem on UART.we are not even to transmit the data to Hyperterminal. i have used u'r program, but it is not working.

in u'r program u were used m=4,n=192,p=3. with these values my program is not working. how much Fpll did u set?

i have changed these values as m=25,n=192,p=3 for getting Fpll 48Mhz. my Xtal value is 25Mhz. when i execute my code i am getting the following ..U}[WÂ¿u}mouÂ»Â¿U}[WÂ¿ÂÂ¿o}u{wu{mmo}oÃ«Ã in Hyperterminal.

if i send the data 00-ff , then i am getting ascii values of FF,FD,FB,FB,F7,F5,F7,F7,EF,ED,EB,EB,EF,ED,EF. in hyperterminal.

here i am sending my code please have a glance of this code and give u'r sugessions. and i am requesting u to send the working example of UART.

* File Name : main.c

* Author : MCD Application Team

* Date First Issued : 05/18/2006 : Version 1.0

* Description : Main program body

********************************************************************************

* History:

* 05/24/2006 : Version 1.1

* 05/18/2006 : Version 1.0

********************************************************************************

* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS

* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.

* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,

* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE

* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING

* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.

*******************************************************************************/

/* Includes ---------------*/

#include ''91x_lib.h''

/* Private typedef --------*/

/* Private define ---------*/

#define TxBufferSize (countof(TxBuffer) - 1)

#define RxBufferSize 0xFF

/* Private macro ----------*/

#define countof(a) (sizeof(a) / sizeof(*(a)))

/* Private variables ------*/

UART_InitTypeDef UART_InitStructure;

u8 TxBuffer[] = ''UART Example: UART - Hyperterminal\n\r'';

u8 RxBuffer[RxBufferSize];

u8 NbrOfDataToTransfer = TxBufferSize;

u8 TxCounter = 0;

u8 RxCounter = 0;

// ****************************************************************

// Phase Lock Loop (PLL) setting

// ****************************************************************

#define PLL_M 25 // M (1 <= M <= 255) value for phase lock loop

#define PLL_N 192 // N (1 <= N <= 255) value for phase lock loop

#define PLL_P 3 // P (1 <= P <= 5) value for phase lock loop

// ****************************************************************

// clocks divisor setting

// ****************************************************************

#define RCLK_Divisor SCU_RCLK_Div1 // Reference clock divisor

#define HCLK_Divisor SCU_HCLK_Div1 // ARM high speed bus divisor

#define PCLK_Divisor SCU_PCLK_Div2 // ARM Peripheral bus divisor

#define FMICLK_Divisor SCU_FMICLK_Div1 // FMI divisor

/* Private function prototypes -------------*/

void SCU_Configuration(void);

void GPIO_Configuration(void);

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

/*******************************************************************************

* Function Name : main

* Description : Main program

* Input : None

* Output : None

* Return : None

*******************************************************************************/

int main()

{

u8 i;

#ifdef DEBUG

debug();

#endif

SCU_MCLKSourceConfig(SCU_MCLK_OSC);

SCU_PLLFactorsConfig(PLL_N, PLL_M, PLL_P);

SCU_PLLCmd(ENABLE);

SCU_MCLKSourceConfig(SCU_MCLK_PLL);

SCU_RCLKDivisorConfig(RCLK_Divisor);

SCU_HCLKDivisorConfig(HCLK_Divisor);

SCU_PCLKDivisorConfig(PCLK_Divisor);

/* Configure the system clocks */

SCU_Configuration();

/* Configure the GPIO ports */

GPIO_Configuration();

UART_InitStructure.UART_WordLength = UART_WordLength_8D;

UART_InitStructure.UART_StopBits = UART_StopBits_1;

UART_InitStructure.UART_Parity = UART_Parity_No ;

UART_InitStructure.UART_BaudRate = 115200;

UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;

UART_InitStructure.UART_Mode = UART_Mode_Tx;//_Rx;

UART_InitStructure.UART_FIFO = UART_FIFO_Enable;

UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */

UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */

UART_DeInit(UART1);

UART_Init(UART1, &UART_InitStructure);

/* Enable the UART1 */

UART_Cmd(UART1, ENABLE);

UART_LoopBackConfig(UART1, DISABLE);

TxCounter = 0;

//while(1){

while(NbrOfDataToTransfer--)

{

UART_SendData(UART1, TxBuffer[TxCounter++]);

while(UART_GetFlagStatus(UART1, UART_FLAG_TxFIFOFull) != RESET);

}

for(i=0;i

NbrOfDataToTransfer = TxBufferSize;

TxCounter = 0;

//}

//do

//{

//if((UART_GetFlagStatus(UART1, UART_FLAG_RxFIFOEmpty) != SET)&&(RxCounter < RxBufferSize))

//{

//RxBuffer[RxCounter] = UART1->DR;

//UART_SendData(UART1, RxBuffer[RxCounter++]);

//}

//

//}while((RxBuffer[RxCounter - 1] != '\r')&&(RxCounter != RxBufferSize));

while (1);

}

/*******************************************************************************

* Function Name : SCU_Configuration

* Description : Configures the system clocks.

* Input : None

* Output : None

* Return : None

*******************************************************************************/

void SCU_Configuration(void)

{

/* Enable the UART1 Clock */

SCU_APBPeriphClockConfig(__UART1, ENABLE);

SCU_APBPeriphClockConfig(__GPIO3, ENABLE);

}

/*******************************************************************************

* Function Name : GPIO_Configuration

* Description : Configures the different GPIO ports.

* Input : None

* Output : None

* Return : None

*******************************************************************************/

void GPIO_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

//GPIO_DeInit(GPIO3);

///*Gonfigure UART1_Rx pin GPIO3.2*/

//GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;

//GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

//GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;

//GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;

//GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1 ;

//GPIO_Init (GPIO3, &GPIO_InitStructure);

GPIO_DeInit(GPIO3);

/*Gonfigure UART1_Tx pin GPIO3.3*/

GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;

GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;

GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;

GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2 ;

GPIO_Init (GPIO3, &GPIO_InitStructure);

}

thanks in advance

raj.

amira1 · ‎2011-05-17

Posted on May 17, 2011 at 09:34

Hi anuradha,

to work with 48 Mhz you have to configure the clock as follow:

SCU_PLLFactorsConfig(192, 25, 3);

SCU_PLLCmd(ENABLE);

SCU_RCLKDivisorConfig(SCU_RCLK_Div1);

SCU_HCLKDivisorConfig(SCU_HCLK_Div1);

SCU_PCLKDivisorConfig(SCU_PCLK_Div2);

SCU_FMICLKDivisorConfig(SCU_FMICLK_Div1);

SCU_MCLKSourceConfig(SCU_MCLK_PLL);

so you have to enable the PLL before selecting the source clock . This configuration works well for me: I've obtained 48Mhz frequency and I was able to send data to hyperterminal.

I hope this can be usefull for you.

Best regards

mirou

amira1 · ‎2011-05-17

Posted on May 17, 2011 at 09:34

Hi anuradha,

I tested your code with MCB-STR9 board and it works well for me. May be you configured wrong the hyperteminal utility.

You find attached the hyperteminal configuration that I've used.

Best regards

mirou

nanuradha · ‎2011-05-17

Posted on May 17, 2011 at 09:34

hai mirou,

i have used u'r hyper terminal file but it is also same as my file.

thank u to conformed that my program is working.

i have tried it in some other system (Hyperterminal), but no use.

i could not find the mistake where actual problem is?

please send me the complete project so that i will find my problem whether it is in Startup code or some where else. its better for me to have a working program.

Thanks for u'r constant help.

regards

raj.

[ This message was edited by: anuradha on 28-12-2006 06:24 ]

[ This message was edited by: anuradha on 28-12-2006 08:10 ]

nanuradha · ‎2011-05-17

Posted on May 17, 2011 at 09:34

hai mirou,

we are using MCB-STR9 Vers.3 Evaluation Board.

On which board u r tested my code?

according to program i think so there is no mistake.

what are the other areas which may cause problem?

please send me the UART working Example project file.

thanks & Regards

Raj.

nanuradha · ‎2011-05-17

Posted on May 17, 2011 at 09:34

hai Zouh,

yes we are using crossover cable (2-3, 3-2, 5-5 of db connector).

we are using Keil uVision3.03a software for Debug.

did u check my code?

regards

raj.