add non-working TM1637 library: using I2C, but there is too much capacitance for opendrain lines
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** library to communicate with a Titan Micro TM1637 IC attached to a 4-digit 7-segment (code)
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* @file led_tm1637.c
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2017
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* @note peripherals used: I2C @ref led_tm1637_i2c
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* @warning no interrupts or sleep modes are used
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*/
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/* standard libraries */
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#include <stdint.h> // standard integer types
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#include <stdlib.h> // general utilities
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/* STM32 (including CM3) libraries */
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#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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#include <libopencm3/stm32/gpio.h> // general purpose input output library
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#include <libopencm3/stm32/i2c.h> // I2C library
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#include <libopencm3/cm3/nvic.h> // interrupt handler
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#include "global.h" // global utilities
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#include "led_tm1637.h" // TM1637 header and definitions
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/** @defgroup led_tm1637_i2c I2C peripheral used to communication with TM1637 IC
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* @{
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*/
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/** I2C peripheral */
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#define LED_TM1637_I2C 1 /**< I2C peripheral */
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/** display brightness */
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static enum led_tm1637_brightness_t display_brightness = LED_TM1637_11DIV16;
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/** if display is on */
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static bool display_on = false;
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//#define RTC_DS1307_I2C_RCC RCC_I2C1 /**< I2C peripheral clock */
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//#define RTC_DS1307_I2C_PORT_RCC RCC_GPIOB /**< I2C I/O peripheral clock */
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//#define RTC_DS1307_I2C_PORT GPIOB /**< I2C I/O peripheral port */
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//#define RTC_DS1307_I2C_PIN_SDA GPIO_I2C1_SDA /**< I2C peripheral data pin (PB7) */
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//#define RTC_DS1307_I2C_PIN_SCL GPIO_I2C1_SCL /**< I2C peripheral clock pin (PB6) */
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//#define RTC_DS1307_I2C_ADDR 0x68 /**< DS1307 I2C address (fixed to 0b1101000) */
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/** @} */
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void led_tm1637_setup(void)
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{
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// configure GPIO for I2C peripheral (this cause a small low pulse on the lines, but I didn't figure out why)
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rcc_periph_clock_enable(RCC_AFIO); // enable clock for alternate function
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rcc_periph_clock_enable(RCC_I2C_PORT(LED_TM1637_I2C)); // all I2C pin are on port B
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gpio_set_mode(I2C_SCL_PORT(LED_TM1637_I2C), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN, I2C_SCL_PIN(LED_TM1637_I2C)); // clock line will be an output since we will be master
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gpio_set_mode(I2C_SDA_PORT(LED_TM1637_I2C), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN, I2C_SDA_PIN(LED_TM1637_I2C)); // data line will be an output since we will be master
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// configure I2C peripheral
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rcc_periph_clock_enable(RCC_I2C(LED_TM1637_I2C)); // enable clock for I2C peripheral
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i2c_reset(I2C(LED_TM1637_I2C)); // reset configuration
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i2c_peripheral_disable(I2C(LED_TM1637_I2C)); // I2C needs to be disable to be configured
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i2c_set_clock_frequency(I2C(LED_TM1637_I2C), rcc_apb1_frequency/1000000); // configure the peripheral clock to the APB1 freq (where it is connected to)
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i2c_set_standard_mode(I2C(LED_TM1637_I2C));
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i2c_set_ccr(I2C(LED_TM1637_I2C), rcc_apb1_frequency/(400000*2)); // set Thigh/Tlow to generate frequency of 400 kHz
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i2c_set_trise(I2C(LED_TM1637_I2C), (300/(1000/(rcc_apb1_frequency/1000000)))+1); // max rise time for 300 kHz is 300 ns
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i2c_peripheral_enable(I2C(LED_TM1637_I2C)); // enable I2C after configuration completed
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}
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/** write data on I2C bus
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* @param[in] data bytes to write
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* @param[in] length number of bytes to write
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* @return if write succeeded
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* @note includes start and stop conditions
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*/
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static bool led_tm1637_write(const uint8_t* data, size_t length)
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{
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bool to_return = false; // return if write succeeded
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if (data==NULL || length==0) { // verify there it data to be read
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return false;
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}
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i2c_send_start(I2C(LED_TM1637_I2C)); // send start condition to start transaction
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while (!(I2C_SR1(I2C(LED_TM1637_I2C)) & I2C_SR1_SB)); // wait until start condition is transmitted
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if (!(I2C_SR2(I2C(LED_TM1637_I2C)) & I2C_SR2_MSL)) { // verify if in master mode
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goto error;
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}
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// in I2C the first byte is the slave address and has special handling
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i2c_send_data(I2C(LED_TM1637_I2C), data[0]); // send first byte (don't use the i2c_send_7bit_address since we don't really care about the 7-bit address or if it's a read or write command)
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while (!(I2C_SR1(I2C(LED_TM1637_I2C)) & I2C_SR1_ADDR)); // wait until address is transmitted
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if (length>1 && !((I2C_SR2(I2C(LED_TM1637_I2C)) & I2C_SR2_TRA))) { // we can only send further byte if the first byte is an I2C write command and put us in transmit mode)
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goto error; // we are not it transmit mode and can't send further bytes
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}
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for (size_t i=1; i<length; i++) {
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i2c_send_data(I2C(LED_TM1637_I2C), data[i]); // send data
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while (!(I2C_SR1(I2C(LED_TM1637_I2C)) & I2C_SR1_TxE)); // wait until byte has been transmitted and ACKed
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}
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to_return = true;
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error:
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if (I2C_SR2(I2C(LED_TM1637_I2C)) & I2C_SR2_BUSY) { // release bus if busy
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i2c_send_stop(I2C(LED_TM1637_I2C)); // send stop to release bus
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}
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while (I2C_SR2(I2C(LED_TM1637_I2C)) & I2C_SR2_MSL); // wait until bus released (non master mode)
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return to_return;
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}
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bool led_tm1637_on(void)
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{
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uint8_t data[] = { 0x88+display_brightness }; // command to turn display on (use set brightness)
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bool to_return = false; // result to return
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if (led_tm1637_write(data,LENGTH(data))) { // send command
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display_on = true; // remember display is on
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to_return = true; // command succeeded
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}
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return to_return; // return result
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}
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bool led_tm1637_off(void)
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{
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const uint8_t data[] = { 0x80+display_brightness }; // command to turn display off (use set brightness)
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bool to_return = false; // result to return
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if (led_tm1637_write(data,LENGTH(data))) { // send command
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display_on = false; // remember display is off
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to_return = true; // command succeeded
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}
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return to_return; // return result
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}
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bool led_tm1637_brightness(enum led_tm1637_brightness_t brightness)
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{
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bool to_return = false; // result to return
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display_brightness = brightness; // save brightness
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if (display_on) { // adjust brightness if display is on
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to_return = led_tm1637_on(); // adjust brightness
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} else {
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to_return = true; // command succeeded
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}
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return to_return;
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}
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bool led_tm1637_number(uint16_t number)
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{
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(void) number;
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bool to_return = false; // result to return
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const uint8_t write_data[] = { 0x40 }; // command: write data, automatic address adding, normal
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uint8_t data[] = { 0xc0, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff }; // set address C0H and add data
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if (led_tm1637_write(write_data,LENGTH(write_data)) && led_tm1637_write(data,LENGTH(data))) { // send commands
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to_return = true;
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}
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return to_return;
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}
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/*
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bool led_tm1637_time(uint8_t hours, uint8_t minutes)
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{
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return true;
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}
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bool led_tm1637_text(char* text)
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{
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return true;
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}
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*/
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@ -0,0 +1,70 @@
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** library to communicate with a Titan Micro TM1637 IC attached to a 4-digit 7-segment (API)
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* @file led_tm1637.h
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2017
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* @note peripherals used: I2C @ref led_tm1637_i2c
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*/
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#pragma once
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/** display brightness levels
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*/
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enum led_tm1637_brightness_t {
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LED_TM1637_1DIV16 = 0,
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LED_TM1637_2DIV16 = 1,
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LED_TM1637_4DIV16 = 2,
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LED_TM1637_10DIV16 = 3,
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LED_TM1637_11DIV16 = 4,
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LED_TM1637_12DIV16 = 5,
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LED_TM1637_13DIV16 = 6,
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LED_TM1637_14DIV16 = 7,
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};
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/** setup communication with TM1637 IC
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*/
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void led_tm1637_setup(void);
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/** switch display on
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* @return if transmission succeeded
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*/
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bool led_tm1637_on(void);
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/** switch display off
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* @return if transmission succeeded
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*/
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bool led_tm1637_off(void);
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/** set display brightness
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* @param[in] brightness brightness level to set
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* @return if transmission succeeded
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*/
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bool led_tm1637_brightness(enum led_tm1637_brightness_t brightness);
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/** display number
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* @param[in] number number to display (0-9999)
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* @return if transmission succeeded
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*/
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bool led_tm1637_number(uint16_t number);
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/** display time
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* @param[in] hours hours to display (0-99)
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* @param[in] minutes minutes to display (0-99)
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* @note display separator between hours and minutes
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* @return if transmission succeeded
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*/
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bool led_tm1637_time(uint8_t hours, uint8_t minutes);
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/** display text
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* @param[in] text text to display (4 characters)
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* @note use first bit of each character to enable dot
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* @return if transmission succeeded
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*/
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bool led_tm1637_text(char* text);
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