Refactor pcf8574 code
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "pcf8574.h"
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/* See the Pioneer 600 Schematic */
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static uint8_t LED_ON = 0xEF;
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static uint8_t LED_OFF = 0xFF;
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static uint8_t BUZZER_ON = 0x7F;
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static uint8_t BUZZER_OFF = 0xFF;
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void pioneer600_led2_on(i2c *i2c)
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{
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pcf8574_port_write(i2c, LED_ON);
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}
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void pioneer600_led2_off(i2c *i2c)
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{
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pcf8574_port_write(i2c, LED_OFF);
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}
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void pioneer600_buzzer_on(i2c *i2c)
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{
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pcf8574_port_write(i2c, BUZZER_ON);
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}
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void pioneer600_buzzer_off(i2c *i2c)
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{
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pcf8574_port_write(i2c, BUZZER_OFF);
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}
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void pioneer600_read_joystick(i2c *i2c)
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{
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uint8_t port;
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port = pcf8574_port_read(i2c);
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if (!(port & 0x01))
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printf("Key A pressed\n");
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else if (!(port & 0x02))
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printf("Key B pressed\n");
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else if (!(port & 0x04))
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printf("Key C pressed\n");
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else if (!(port & 0x08))
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printf("Key D pressed\n");
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else if (port & 0x0F)
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printf("No keys pressed\n");
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}
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int main(void)
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{
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i2c *i2c_pcf8574;
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uint8_t led_status = LED_OFF;
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uint8_t buzzer_status = BUZZER_OFF;
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uint32_t input;
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uint8_t ret = 0;
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i2c_pcf8574 = pcf8574_init(0, PCF8574_ADDRESS);
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if (i2c_pcf8574 == NULL)
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return EXIT_FAILURE;
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while (true) {
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printf("\nEnter choice: 1. Joy stick status 2. Led On/Off 3. Buzzer On/Off 4. Exit\n");
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scanf("%d", &input);
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switch (input) {
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case 1:
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pioneer600_read_joystick(i2c_pcf8574);
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break;
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case 2:
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if (led_status == LED_OFF) {
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pioneer600_led2_on(i2c_pcf8574);
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led_status = LED_ON;
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} else {
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pioneer600_led2_off(i2c_pcf8574);
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led_status = LED_OFF;
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}
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break;
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case 3:
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if (buzzer_status == BUZZER_OFF) {
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pioneer600_buzzer_on(i2c_pcf8574);
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buzzer_status = BUZZER_ON;
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} else {
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pioneer600_buzzer_off(i2c_pcf8574);
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buzzer_status = BUZZER_OFF;
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}
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break;
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case 4:
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goto exit;
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break;
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default:
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printf("Enter valid input\n");
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break;
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}
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}
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exit:
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ret = pcf8574_free(i2c_pcf8574);
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if (ret == EXIT_FAILURE)
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perror("Failed to close I2C port");
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return 0;
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}
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@ -1,207 +1,87 @@
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/*
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* pcf8574.c
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* PCF8574 IO expander helper functions using libsoc API.
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*
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* libsoc i2c API Documentation: http://jackmitch.github.io/libsoc/c/i2c/#i2c
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*
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* Copyright (C) 2017 - BhuvanChandra DV <bhuvanchandradv@gmail.com>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <libsoc_i2c.h>
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/* PCF8574 I2C Address on Pioneer 600 */
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#define PCF8574_ADDRESS 0x20
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static uint8_t LED_ON = 0xEF;
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static uint8_t LED_OFF = 0xFF;
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static uint8_t BUZZER_ON = 0x7F;
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static uint8_t BUZZER_OFF = 0xFF;
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/*
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* libsoc i2c API Documentation: http://jackmitch.github.io/libsoc/c/i2c/#i2c
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*/
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#include "pcf8574.h"
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i2c* pcf8574_init(uint8_t i2c_bus, uint8_t i2c_address)
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{
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i2c *i2c;
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uint8_t ret;
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uint8_t buf[1] = {0};
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i2c *i2c = libsoc_i2c_init(i2c_bus, i2c_address);
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i2c = libsoc_i2c_init(i2c_bus, i2c_address);
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if (i2c == NULL) {
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perror("libsoc_i2c_init failed");
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return i2c;
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}
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/*
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* http://cache.nxp.com/documents/data_sheet/PCF8574_PCF8574A.pdf
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* See Page 7 of the data sheet Quasi-bidirectional I/Os
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* Default all expander pins as input
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*/
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buf[0] = 0xff;
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ret = libsoc_i2c_write(i2c, buf, 1);
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if (ret == EXIT_FAILURE) {
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perror("PCF8574 initialization failed");
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libsoc_i2c_free(i2c);
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return NULL;
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}
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return i2c;
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}
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int pcf8574_close(i2c *i2c)
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int pcf8574_free(i2c *i2c)
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{
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return libsoc_i2c_free(i2c);
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}
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int pioneer600_led2_on(i2c *i2c)
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uint8_t pcf8574_port_read(i2c *i2c)
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{
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uint8_t ret;
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uint8_t buf[1] = {0};
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uint8_t res;
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buf[0] = LED_ON;
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ret = libsoc_i2c_write(i2c, buf, 1);
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if (ret == EXIT_FAILURE)
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perror("I2C write failed");
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if (libsoc_i2c_read(i2c, &res, 1))
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return 0;
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return ret;
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return res;
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}
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int pioneer600_led2_off(i2c *i2c)
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size_t pcf8574_port_read_buf(i2c *i2c, void *buf, size_t len)
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{
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uint8_t ret;
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uint8_t buf[1] = {0};
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uint8_t *_buf = (uint8_t *)buf;
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buf[0] = LED_OFF;
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ret = libsoc_i2c_write(i2c, buf, 1);
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if (ret == EXIT_FAILURE)
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perror("I2C write failed");
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if (!len || !buf)
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return 0;
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return ret;
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if (libsoc_i2c_read(i2c, _buf, len))
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return 0;
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return len;
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}
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int pioneer600_buzzer_on(i2c *i2c)
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size_t pcf8574_port_write_buf(i2c *i2c, void *buf, size_t len)
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{
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uint8_t ret;
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uint8_t buf[1] = {0};
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uint8_t *_buf = (uint8_t *)buf;
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buf[0] = BUZZER_ON;
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ret = libsoc_i2c_write(i2c, buf, 1);
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if (ret == EXIT_FAILURE)
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perror("I2C write failed");
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if (!len || !buf)
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return 0;
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return ret;
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if (libsoc_i2c_write(i2c, _buf, len))
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return 0;
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return len;
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}
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int pioneer600_buzzer_off(i2c *i2c)
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void pcf8574_port_write(i2c *i2c, uint8_t value)
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{
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uint8_t ret;
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uint8_t buf[1] = {0};
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buf[0] = BUZZER_OFF;
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ret = libsoc_i2c_write(i2c, buf, 1);
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if (ret == EXIT_FAILURE)
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perror("I2C write failed");
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return ret;
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libsoc_i2c_write(i2c, &value, 1);
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}
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void pioneer600_read_joystick(i2c *i2c)
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bool pcf8574_gpio_read(i2c *i2c, uint8_t num)
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{
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uint8_t ret;
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uint8_t buf[1] = {0};
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ret = libsoc_i2c_read(i2c, buf, 1);
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if (ret == EXIT_FAILURE)
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perror("I2C read failed");
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else {
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if (buf[0] & 0x0F)
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printf("No keys pressed\n");
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if (!(buf[0] & 0x01))
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printf("Key A pressed\n");
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if (!(buf[0] & 0x02))
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printf("Key B pressed\n");
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if (!(buf[0] & 0x04))
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printf("Key C pressed\n");
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if (!(buf[0] & 0x08))
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printf("Key D pressed\n");
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}
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return;
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return (bool)((pcf8574_port_read(i2c) >> num) & 1);
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}
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int main(void)
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void pcf8574_gpio_write(i2c *i2c, uint8_t num, bool value)
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{
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i2c *i2c_pcf8574;
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uint8_t led_status = LED_OFF;
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uint8_t buzzer_status = BUZZER_OFF;
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uint32_t input;
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uint8_t ret = 0;
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uint8_t bit = (uint8_t)!value << num;
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uint8_t mask = ~(1 << num);
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i2c_pcf8574 = pcf8574_init(0, PCF8574_ADDRESS);
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if (i2c_pcf8574 == NULL)
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return EXIT_FAILURE;
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while (true) {
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printf("\nEnter choice: 1. Joy stick status 2. Led On/Off 3. Buzzer On/Off 4. Exit\n");
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scanf("%d", &input);
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switch (input) {
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case 1:
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pioneer600_read_joystick(i2c_pcf8574);
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break;
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case 2:
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if (led_status == LED_OFF) {
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ret = pioneer600_led2_on(i2c_pcf8574);
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if (ret == EXIT_FAILURE)
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printf("Led turn on failed\n");
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else {
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led_status = LED_ON;
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printf("Led On\n");
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}
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} else {
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ret = pioneer600_led2_off(i2c_pcf8574);
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if (ret == EXIT_FAILURE)
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printf("Led turn off failed\n");
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else {
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led_status = LED_OFF;
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printf("Led Off\n");
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}
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}
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break;
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case 3:
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if (buzzer_status == BUZZER_OFF) {
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ret = pioneer600_buzzer_on(i2c_pcf8574);
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if (ret == EXIT_FAILURE)
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printf("Buzzer turn on failed\n");
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else {
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buzzer_status = BUZZER_ON;
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printf("Buzzer On\n");
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}
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} else {
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ret = pioneer600_buzzer_off(i2c_pcf8574);
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if (ret == EXIT_FAILURE)
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printf("Buzzer turn off failed\n");
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else {
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buzzer_status = BUZZER_OFF;
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printf("Buzzer Off\n");
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}
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}
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break;
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case 4:
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goto exit;
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break;
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default:
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printf("Enter valid input\n");
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break;
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}
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}
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exit:
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ret = pcf8574_close(i2c_pcf8574);
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if (ret == EXIT_FAILURE)
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perror("Failed to close I2C port");
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return 0;
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pcf8574_port_write (i2c, (pcf8574_port_read(i2c) & mask) | bit);
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}
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@ -0,0 +1,29 @@
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/*
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* pcf8574.h
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*
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* Created on: Apr 28, 2017
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* Author: sanchayan
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*/
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#ifndef PCF8574_H_
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#define PCF8574_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <libsoc_i2c.h>
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/* PCF8574 I2C Address on Pioneer 600 */
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#define PCF8574_ADDRESS 0x20
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i2c* pcf8574_init(uint8_t i2c_bus, uint8_t i2c_address);
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int pcf8574_free(i2c *i2c);
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uint8_t pcf8574_port_read(i2c *i2c);
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size_t pcf8574_port_read_buf(i2c *i2c, void *buf, size_t len);
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void pcf8574_port_write(i2c *i2c, uint8_t value);
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size_t pcf8574_port_write_buf(i2c *i2c, void *buf, size_t len);
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bool pcf8574_gpio_read(i2c *i2c, uint8_t num);
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void pcf8574_gpio_write(i2c *i2c, uint8_t num, bool value);
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#endif /* PCF8574_H_ */
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