help at UART2

[sengunguven]

Posted on November 20, 2007 at 08:43

help at UART2

[sengunguven]

Posted on May 17, 2011 at 09:48

i tried to test the example UART program (for UART0, UART1, and UART2) with using KEIL development tool.

- Although the program works perfect for UART0 and UART1, it did not work for UART2. There was not an output on debugger, at UART2 screen. - I controlled the data manual for different pin configurations. Can someone say where is my mistake? The modified example code is at below. Thanks Sengun. /******************** (C) COPYRIGHT 2006 STMicroelectronics ******************** * 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 Example1: UART - Hyperterminal communication using hardware flow control\n\r''; u8 RxBuffer[RxBufferSize]; u8 NbrOfDataToTransfer = TxBufferSize; u8 TxCounter = 0; u8 RxCounter = 0; /* 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() { #ifdef DEBUG debug(); #endif /* Configure the system clocks */ SCU_Configuration(); /* Configure the GPIO ports */ GPIO_Configuration(); /* UART0 configuration -------------------------------------------------------*/ /* UART0 configured as follow: - Word Length = 7 Bits - Two Stop Bit - No parity - BaudRate = 115200 baud - Hardware flow control enabled (RTS and CTS signals) - Receive and transmit enabled - Receive and transmit FIFOs are enabled - Transmit and Receive FIFOs levels have 8 bytes depth */ UART_InitStructure.UART_WordLength = UART_WordLength_7D; UART_InitStructure.UART_StopBits = UART_StopBits_2; 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(UART2); UART_Init(UART2, &UART_InitStructure); /* Enable the UART2 */ UART_Cmd(UART2, ENABLE); /* Communication hyperterminal-UART2 using the hardware flow control */ /* Send a buffer from UART to hyperterminal */ while(NbrOfDataToTransfer--) { UART_SendData(UART2, TxBuffer[TxCounter++]); while(UART_GetFlagStatus(UART2, UART_FLAG_TxFIFOFull) != RESET); } /* Receive a string (Max RxBufferSize bytes) from the Hyperterminal ended by '\r' (Enter key) */ do { if((UART_GetFlagStatus(UART2, UART_FLAG_RxFIFOEmpty) != SET)&&(RxCounter < RxBufferSize)) { RxBuffer[RxCounter] = UART2->DR; UART_SendData(UART2, 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 UART2 Clock */ SCU_APBPeriphClockConfig(__UART2, ENABLE); /* Enable the GPIO3 Clock */ SCU_APBPeriphClockConfig(__GPIO3, ENABLE); /* Enable the GPIO5 Clock */ SCU_APBPeriphClockConfig(__GPIO5, 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 UART0_Rx pin GPIO5.1*/ /*Gonfigure UART1_Rx pin GPIO3.2*/ /*Gonfigure UART2_Rx pin GPIO3.1*/ GPIO_InitStructure.GPIO_Direction = GPIO_PinInput; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; 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(GPIO5); /*Gonfigure UART0_Tx pin GPIO3.4*/ /*Gonfigure UART1_Tx pin GPIO3.3*/ /*Gonfigure UART2_Tx pin GPIO5.1*/ GPIO_InitStructure.GPIO_Direction = GPIO_PinInput; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ; GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt3 ; GPIO_Init (GPIO5, &GPIO_InitStructure); } /******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/

[vsilvaamorim]

Posted on May 17, 2011 at 09:48

Hi

If the board that you are using is the STR912-SK from IAR, the pin corresponding to UART2_TX is P3.0 and not P5.1. Do not forget to put the jumper in the correct position. Regards Vitor