Posted on November 01, 2016 at 15:11Recently I have observed an odd phenomenon: I have a code (which I believe is faulty) , I program the MCU (which initially is fully erased ) with that code;
after that the MCU can not be reprogrammed by programming environment (CooCox IDE).
So I have to use ST Link utility to erase the chip using connection under reset method, and after this CooCox can reprogram the MCU.(but just once)
If i remove from the source code the function which I believe is causing this behaviour , CooCox can reprogram my chip as many times as I want.
The MCU used is the one found on STM32F072 Disco Board.
The source code is :
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f0xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f0xx.c file
*/
gpio_config();
/* Infinite loop */
u8 i=0;
while (1)
{ }
}
void gpio_config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_StructInit(&GPIO_InitStructure);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA|RCC_AHBPeriph_GPIOB|RCC_AHBPeriph_GPIOF,ENABLE);
/* Enable SYSCFG clock for EXTI controller */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;//50MHz
// PB3,4,12,13,14,15 PA8..13; PF6
GPIO_InitStructure.GPIO_Pin = D1_Pin|SegA_Pin|SegB_Pin|SegD_Pin|SegE_Pin;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = D2_Pin|D3_Pin|D4_Pin|SegC_Pin|SegG_Pin;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = SegF_Pin;
/GPIO_Init(GPIOF, &GPIO_InitStructure);
//K1 , K2 relays pins
GPIO_InitStructure.GPIO_Pin = K1Pin|K2Pin;
GPIO_InitStructure.GPIO_Mode = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;//50MHz
GPIO_Init(RelayPort, &GPIO_InitStructure);
//buttons
GPIO_InitStructure.GPIO_Pin= SW1Pin|SW2Pin|SW3Pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;//50MHz
GPIO_Init(SWPort, &GPIO_InitStructure);
//buttons interrupts
/* Configure EXTI7 line */
EXTI_InitStructure.EXTI_Line = EXTI_Line7;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Configure EXTI6 line */
EXTI_InitStructure.EXTI_Line = EXTI_Line6;
EXTI_Init(&EXTI_InitStructure);
/* Configure EXTI5 line */
EXTI_InitStructure.EXTI_Line = EXTI_Line5;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set EXTI4..15 Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
and that it is all. USE_FULL_ASSERT is disabled
phenomenon
phenomenon
