Hi I have made a header board for STM32L152VD after every restart it takes few seconds for the board to start running. I use HSI clock. what do you think the problem is?
-> after power on, the LED starts flashing rapidly for few seconds (between 2 to 10 seconds) then LED becomes steadily on.
I encountered similar problem before.
The LCD of our device shares the same pins with a FT240X USB Chip, our device has a Lithium battery and a USB charging circuit. I encountered similar problem as you, so I discuss this problem with my hardware colleague, he did a full hardware analysis, and told me that this hardware needs a few seconds to become stable after power on. Since hardware can't be modified, he asked me to do a Sleep_Mode_IO_Config() immediately after power on, then wait for a while, then start to do the Runtime_IO_Config() and the real work. After this software modification, the problem doesn't disappear, but under our control.
Sleep_Mode_IO_Config(): He checked and decided each GPIO pins should be configured as In or Out, if it is an output pin, it should be high or low.
int main(void) { int i; static uint8_t Wait_PC_Connect = 1; LPC_SYSCON->PDRUNCFG |= (1u<<3); /* Set BOD Power-Down bit */ GPIO_OutInit(); Enable_Timer32B0(); Sleep_Mode_IO_Config(); delay_in_ms(50); GPIOSetValue( LPC_GPIO0, 7, 1 ); // En_OP_Power - ON Blink_Delay(8); Runtime_IO_Config(); ADC_Init(); SSP_Init(); I2C_Init( LPC_I2C, 400000 ); UART_Init(115200); delay_in_ms(10); LCD_Init(); delay_in_ms(10); GPIOSetValue( LPC_GPIO2, 10, 1 ); // LCD_BKL - ON
After this software modification, the few seconds (between 2 to 10 seconds) becomes a fixed number, let's say at most 5 seconds.
Dear John Thanks for your advise. I found that my problem is from the firmware since I tried with earlier versions of the firmware and modified it to new version. Now this problem has disappeared. I am trying to find out what are the differences that has made this problem.
Hamed Adldoost Posted 29-Jun-2015 16:30 GMT I used the same program to run on STM32L152RC discovery board but I had no problem.
So, it was not the same program?