Configuring PCOR and PSOR register in FRDMKL25Z board!

[suma_success]

Hello ,

I have a buzzer connected to PORTA , Pin 12 on the FRDM KL25Z board. ( GPIOA_PDDR = 0x1000)

I can turn the Buzzer ON and OFF by writing GPIOA_PDOR=0X1000 and GPIOA_PDOR=0 respectively.

However ,I modified the program to GPIOA_PCOR=0x1000 to turn ON the buzzer and GPIOA_PSOR=0X1000 to Turn OFF the Buzzer. The program fails to respond.

Any help is appreciated.

Regards,

[nxf56274]

Hi,

Use the led demo to test PCOR and PSOR. If it works, your code may have some problem. 

Have a great day,
TIC

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[suma_success]

Dear Da Li ,

The demo program works fine. Buzzer is connected to PORTA Pin 12. Buzzer works OK if i configure PDOR register as in the program below. However , PCOR and PSOR registers setting to ON and OFF the buzzer does not function. 

buzzeroff
LDR R3, =GPIOA_PDOR
LDR R4, =0X0
STR R4, [R3]
B loop

buzzeron
LDR R0, =GPIOA_PDOR
LDR R1, =0x1000
STR R1, [R0]
B loop

[bobpaddock]

To modify the PCOR or PSOR registers, they must be the ones pointed at,

not the Data Output register.

This is from the KL27 that I had at hand:

/** GPIO - Peripheral register structure */
typedef struct GPIO_MemMap {
uint32_t PDOR; /**< Port Data Output Register, offset: 0x0 */
uint32_t PSOR; /**< Port Set Output Register, offset: 0x4 */
uint32_t PCOR; /**< Port Clear Output Register, offset: 0x8 */
uint32_t PTOR; /**< Port Toggle Output Register, offset: 0xC */
uint32_t PDIR; /**< Port Data Input Register, offset: 0x10 */
uint32_t PDDR; /**< Port Data Direction Register, offset: 0x14 */
} volatile *GPIO_MemMapPtr;

[nxf56274]

Hi,

Why do you use asm? We have the sdk in https://mcuxpresso.nxp.com/en/select.

When you configure the PCOR ans PSOR. Use debugger to check the register if the value is changed.

Have a great day,
TIC

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