mirror of
https://github.com/FunKey-Project/FunKey-GPIO-Mapping.git
synced 2025-12-12 09:48:51 +01:00
79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/select.h>
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#include <linux/input.h>
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#include "read_conf_file.h"
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#include <assert.h>
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#include <linux/i2c-dev.h>
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#include "driver_pcal6416a.h"
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/****************************************************************
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* Defines
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****************************************************************/
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#define DEBUG_PCAL6416A_PRINTF (0)
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#if (DEBUG_PCAL6416A_PRINTF)
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#define DEBUG_PRINTF(...) printf(__VA_ARGS__);
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#else
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#define DEBUG_PRINTF(...)
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#endif
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/****************************************************************
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* Static variables
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****************************************************************/
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int fd_i2c_expander;
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char i2c0_sysfs_filename[] = "/dev/i2c-0";
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/****************************************************************
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* Static functions
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****************************************************************/
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/****************************************************************
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* Public functions
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****************************************************************/
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bool pcal6416a_init(void) {
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if ((fd_i2c_expander = open(i2c0_sysfs_filename,O_RDWR)) < 0) {
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printf("Failed to open the I2C bus %s", i2c0_sysfs_filename);
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// ERROR HANDLING; you can check errno to see what went wrong
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return false;
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}
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if (ioctl(fd_i2c_expander,I2C_SLAVE,PCAL6416A_I2C_ADDR) < 0) {
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printf("Failed to acquire bus access and/or talk to slave.\n");
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// ERROR HANDLING; you can check errno to see what went wrong
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return false;
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}
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uint16_t val_enable_pullups = 0xffff;
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i2c_smbus_write_word_data ( fd_i2c_expander , PCAL6416A_EN_PULLUPDOWN , val_enable_pullups );
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uint16_t val_enable_interrupts = 0x0000;
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i2c_smbus_write_word_data ( fd_i2c_expander , PCAL6416A_INT_MASK , val_enable_interrupts );
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return true;
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}
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bool pcal6416a_deinit(void) {
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// Close I2C open interface
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close(fd_i2c_expander);
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return true;
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}
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uint16_t pcal6416a_read_mask_interrupts(void){
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uint16_t val = i2c_smbus_read_word_data ( fd_i2c_expander , PCAL6416A_INT_STATUS );
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DEBUG_PRINTF("READ PCAL6416A_INT_STATUS : 0x%04X\n",val);
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return val;
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}
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uint16_t pcal6416a_read_mask_active_GPIOs(void){
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uint16_t val = i2c_smbus_read_word_data ( fd_i2c_expander , PCAL6416A_INPUT );
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val = 0xFFFF-val;
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DEBUG_PRINTF("READ PCAL6416A_INPUT (active GPIOs) : 0x%04X\n",val);
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return val;
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} |