Posted on October 27, 2016 at 13:34Hello,
I'm using a stm32f030x6. During normal operation i need my swclk-pin (PA14 in my package) to be configured as a UART. However for debugging, i'd like to reconfigure it back and use it as a swclk to use it with the ST-LINK
i tried the following:
void ReEnableSWCLK()
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = GPIO_PIN_14; // only initialize the CLK
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLDOWN;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF0_SWCLK;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
which did not work. Then Resetting the whole GPIOA registers back to their reset values (then SWD is available):
// bring back the SWD port!
GPIOA->AFR[0] = 0x00000000;
GPIOA->AFR[1] = 0x00000000;
GPIOA->MODER = 0x28000000;
GPIOA->OTYPER = 0x00000000;
GPIOA->OSPEEDR = 0x0C000000;
GPIOA->PUPDR = 0x24000000;
which sort o helps: my st-link finds the chip (unlike in uart mode) but it fails to really comunicate to it:
Info : using stlink api v2
Info : Target voltage: 3.592147
Info : stm32f0x.cpu: hardware has 4 breakpoints, 2 watchpoints
Error: jtag status contains invalid mode value - communication failure
Polling target stm32f0x.cpu failed, trying to reexamine
Info : stm32f0x.cpu: hardware has 4 breakpoints, 2 watchpoints
Info : Previous state query failed, trying to reconnect
Error: jtag status contains invalid mode value - communication failure
and so on...
i'm tying to reenable the swclk from an interrupt routine.
Any Idea what's going wrong? any help is higly appreciated. Thank you!!
#stm32f030-!swclk
