GPIO over CPLD

Each of the 4 GPIO ports contains 8 ouput and 8 input pins. The ports are not as fast as the integrated GPIO ports of the microcontroller.

Please make sure the CT Board is in the correct mode.
Supported mode: 1

The registers are read / write.

The code snippets below show how to use the GPIO.

#include "reg_ctboard.h"
 
uint8_t data_byte = CT_GPIO->IN.BYTE.P1;              /* Read byte from P1. */
uint16_t data_hword = CT_GPIO->IN.HWORD.P2_1;         /* Read half word from P1 and P2. */
uint32_t data_word = CT_GPIO->IN.WORD;                /* Read word from all ports (P1..4). */
 
CT_GPIO->OUT.BYTE.P3 = (uint8_t) data_byte;           /* Write byte of data to P3. */
CT_GPIO->OUT.HWORD.P4_3 = (uint16_t) data_halfword;   /* Write halfword of data to P3..4 */
CT_GPIO->OUT.WORD = (uint32_t) data_word;             /* Write word of data to all ports (P1..4). */

ADDR_GPIO_IN    EQU      0x60000410
ADDR_GPIO_OUT   EQU      0x60000400
 
                LDR      r0, =ADDR_GPIO_IN
                LDRB     r1, [r0, #0]                 ; Read byte from P1.
                LDRH     r1, [r0, #0]                 ; Read half word from P1 and P2.
                LDR      r1, [r0, #0]                 ; Read word from all ports (P1..4).
 
                LDR      r0, =ADDR_GPIO_OUT
                STRB     r1, [r0, #2]                 ; Write byte of data to P3.
                STRH     r1, [r0, #2]                 ; Write halfword of data to P3..4.
                STR      r1, [r0, #0]                 ; Write word of data to all ports (P1..4).