Hi,
I am working on an application for the Primer 2 that will use USART2 to communicate with another microcontroller.
I have set up a project to test the USART functionality, I have an extension board connected to the Primer 2. When i run the following code I can not seem to detect the serial message signal at the TX pin on the extension connector with my Oscilloscope?
Am i doing something wrong in my code or is this a hardware problem?
/********************** (C) COPYRIGHT 2007-2009 RAISONANCE ********************
* File Name : Application.c
* Author :
* Date First Issued :
* Description : Circle_App CircleOS application template.
* Revision :
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_usart.h"
#include "stm32f10x_conf.h"
#include "stm32f10x_lib.h"
#include "stm32f10x_map.h"
#define __STM32F10x_H
#include "stm32f10x_lib.h"
#include "circle_api.h"
/* Private defines -----------------------------------------------------------*/
void RCC_Config(void);
void USART_Config(void);
void Timer_Init(void);
void Send_Byte(u8 Txbyte);
// The following should be the minimal CircleOS version needed by your application
#define NEEDEDVERSION "V 3.7"
/* Private functions ---------------------------------------------------------*/
static enum MENU_code MsgVersion(void);
/* Public variables ----------------------------------------------------------*/
const char Application_Name[8+1] = {"Serial"}; // Max 8 characters
/* Private Variables */
ErrorStatus HSEStartUpStatus;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
/*******************************************************************************
* Function Name : Application_Ini
* Description : Initialization function of Circle_App. This function will
* be called only once by CircleOS.
* Input : None
* Return : MENU_CONTINUE_COMMAND
*******************************************************************************/
enum MENU_code Application_Ini(void)
{
// Ensure that the current OS version is recent enough
if(strcmp(UTIL_GetVersion(), NEEDEDVERSION) < 0)
{
return MsgVersion();
}
Timer_Init();
RCC_Config();
USART_Config();
return MENU_CONTINUE_COMMAND;
}
/*******************************************************************************
* Function Name : Application_Handler
* Description : Management of the Circle_App.
*
* Input : None
* Return : MENU_CONTINUE
*******************************************************************************/
enum MENU_code Application_Handler(void)
{
Send_Byte(0x80);
Send_Byte(0x80);
Send_Byte(0x81);
Send_Byte(0x82);
Send_Byte(0x83);
Send_Byte(0x80);
Send_Byte(0x81);
Send_Byte(0x82);
Send_Byte(0x83);
Send_Byte(0x80);
Send_Byte(0x81);
Send_Byte(0x82);
Send_Byte(0x83);
Send_Byte(0x80);
Send_Byte(0x81);
Send_Byte(0x82);
Send_Byte(0x83);
Send_Byte(0x80);
Send_Byte(0x81);
Send_Byte(0x82);
Send_Byte(0x83);
Send_Byte(0x80);
Send_Byte(0x81);
Send_Byte(0x82);
Send_Byte(0x83);
Send_Byte(0x81);
Send_Byte(0x82);
Send_Byte(0x83);
#if 1
// If the button is pressed, the application is exited
if(BUTTON_GetState() == BUTTON_PUSHED)
{
BUTTON_WaitForRelease();
return MENU_Quit();
}
#endif
return MENU_CONTINUE; // Returning MENU_LEAVE will quit to CircleOS
}
/*******************************************************************************
* Function Name : MsgVersion
* Description : Display the current CircleOS version and the version needed
* exit to main menu after 4 secondes
*
* Input : None
* Return : MENU_REFRESH
*******************************************************************************/
static enum MENU_code MsgVersion(void)
{
int hh,mm,ss,ss2;
DRAW_DisplayString(5,60,"CircleOS",17);
DRAW_DisplayString(80,60,UTIL_GetVersion(),6);
DRAW_DisplayString(5,34,NEEDEDVERSION,6);
DRAW_DisplayString(50,34," required",12);
RTC_GetTime( &hh, &mm, &ss);
ss = ss + 4; // 4 secondes
ss = ss%60;
do
{
RTC_GetTime( &hh, &mm, &ss2 );
}
while ( ss2 != ss ); // do while < 4 secondes
DRAW_Clear();
return MENU_REFRESH;
}
void RCC_Config(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* Enable PLL */
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
}
void USART_Config(void)
{
/* Enable GPIOx clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Enable USART2 clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure USART2 Tx (PA.2) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART2 Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART2 configuration ------------------------------------------------------*/
/* USART2 configured as follow:
- BaudRate = 9600 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
- USART Clock disabled
- USART CPOL: Clock is active low
- USART CPHA: Data is captured on the second edge
- USART LastBit: The clock pulse of the last data bit is not output to
the SCLK pin
*/
/* USART configuration ------------------------------------------------------*/
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART2, &USART_InitStructure);
/* Configure USART2 */
USART_Init(USART2, &USART_InitStructure);
/* Enable USART2 Receive and Transmit interrupts */
//USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
/* Enable the USART2 */
USART_Cmd(USART2, ENABLE);
//OldHandler = (tHandler)UTIL_GetIrqHandler( 0xD8 );
//UTIL_SetIrqHandler(0xD8, MyUsart2Handler);
}
void Timer_Init(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the TIM4 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_Prescaler = 719;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_ARRPreloadConfig(TIM4, ENABLE);
}
void Send_Byte(u8 Txbyte)
{
USART_SendData(USART2, Txbyte);
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
TIM_SetCounter(TIM4, 0);
while (TIM_GetCounter(TIM4)<7);
}
