Tool/software: TI-RTOS
Dear forum,
some follow-up of the posting
After carefully reading the technical reference of the processor it became clear, that a locking mechanism blocks the digital functions of the pin to prevent unintended configuration of the pin as NMI.
It needs to be unlocked, e.g. by the following function:
#include <ti/drivers/GPIO.h>
#include <ti/drivers/gpio/GPIOMSP432E4.h>
#include <ti/devices/msp432e4/driverlib/gpio.h>
#include <ti/devices/msp432e4/driverlib/inc/hw_gpio.h>
#include <ti/drivers/power/PowerMSP432E4.h>
#include <ti/devices/msp432e4/driverlib/types.h>
static const uint_fast16_t powerMgrIds[] = {
PowerMSP432E4_PERIPH_GPIOA, /* PORTA */
PowerMSP432E4_PERIPH_GPIOB, /* PORTB */
PowerMSP432E4_PERIPH_GPIOC, /* PORTC */
PowerMSP432E4_PERIPH_GPIOD, /* PORTD */
PowerMSP432E4_PERIPH_GPIOE, /* PORTE */
PowerMSP432E4_PERIPH_GPIOF, /* PORTF */
PowerMSP432E4_PERIPH_GPIOG, /* PORTG */
PowerMSP432E4_PERIPH_GPIOH, /* PORTH */
PowerMSP432E4_PERIPH_GPIOJ, /* PORTJ */
PowerMSP432E4_PERIPH_GPIOK, /* PORTK */
PowerMSP432E4_PERIPH_GPIOL, /* PORTL */
PowerMSP432E4_PERIPH_GPIOM, /* PORTM */
PowerMSP432E4_PERIPH_GPION, /* PORTN */
PowerMSP432E4_PERIPH_GPIOR, /* PORTR */
PowerMSP432E4_PERIPH_GPIOS, /* PORTS */
PowerMSP432E4_PERIPH_GPIOT, /* PORTT */
PowerMSP432E4_PERIPH_GPIOP, /* PORTP */
PowerMSP432E4_PERIPH_GPIOQ, /* PORTQ */
};
/* Returns the GPIO power resource ID */
#define getPowerResource(port) (powerMgrIds[port])
void GPIO_unlock(GPIO_PinConfig pinConfig)
{
uint_fast8_t pinMask = pinConfig & 0xFF;
uint8_t port = (pinConfig >> 8) & 0xFF;
Power_setDependency(getPowerResource(port));
uint32_t portBase = GPIOMSP432E4_getGpioBaseAddr(port);
/* write magic value to lock register */
HWREG(portBase + GPIO_O_LOCK) = 0x4C4F434B;
HWREG(portBase + GPIO_O_CR) = pinMask;
}
Use it before GPIO_init as follows:
GPIO_unlock(GPIOMSP432E4_PD7);
GPIO_unlock(GPIOMSP432E4_PE7);
