Not able to read the pin status in LPC 1114/302

monarchbaxi — Fri, 14 Apr 2017 04:57:37 GMT

Hi i am using LPC 1114/302 but i am not able to read the stauts of the Port Pin(P1_1 and P1_3)

Part of my code is as follows

#define LPC_GPIO ((LPC_GPIO_T *) LPC_GPIO_PORT0_BASE)

typedef struct { /*!< GPIO_PORT Structure */
__IO uint32_t DATA[4096]; /*!< Offset: 0x0000 to 0x3FFC Data address masking register (R/W) */
uint32_t RESERVED1[4096];
__IO uint32_t DIR; /*!< Offset: 0x8000 Data direction register (R/W) */
__IO uint32_t IS; /*!< Offset: 0x8004 Interrupt sense register (R/W) */
__IO uint32_t IBE; /*!< Offset: 0x8008 Interrupt both edges register (R/W) */
__IO uint32_t IEV; /*!< Offset: 0x800C Interrupt event register (R/W) */
__IO uint32_t IE; /*!< Offset: 0x8010 Interrupt mask register (R/W) */
__I uint32_t RIS; /*!< Offset: 0x8014 Raw interrupt status register (R/ ) */
__I uint32_t MIS; /*!< Offset: 0x8018 Masked interrupt status register (R/ ) */
__O uint32_t IC; /*!< Offset: 0x801C Interrupt clear register (W) */
uint32_t RESERVED2[8184]; /* Padding added for aligning contiguous GPIO blocks */
} LPC_GPIO_T;

STATIC INLINE bool Chip_GPIO_GetPinState(LPC_GPIO_T *pGPIO, uint8_t port, uint8_t pin)
{
return (pGPIO[port].DATA[1 << pin]) != 0;
}

Chip_GPIO_GetPinState( LPC_GPIO, 1, 3)

this function always returns a zero value irrespective of the pin status

Pl guide

Re: Not able to read the pin status in LPC 1114/302

monarchbaxi — Sat, 15 Apr 2017 04:55:40 GMT

Got the solution.... the problem was with configuring the pin ...the pin can also be used as analog pin and had to configure it to IOCON_DIGMODE_EN ......though the reset value for this pin is DIGITAL FUNCTION MODE

Problematic code

Chip_IOCON_PinMuxSet( LPC_IOCON ,CONFIG_SENSOR ,( IOCON_FUNC1 | IOCON_MODE_PULLDOWN ));

working code

Chip_IOCON_PinMuxSet( LPC_IOCON ,CONFIG_SENSOR ,( IOCON_FUNC1 | IOCON_MODE_PULLDOWN | IOCON_DIGMODE_EN));

topic Not able to read the pin status in LPC 1114/302 in LPC Microcontrollers

Not able to read the pin status in LPC 1114/302

Re: Not able to read the pin status in LPC 1114/302