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/*
* Author: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
* Copyright (c) 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <string>
#include <stdexcept>
#include "tm1637.h"
#include <stdarg.h>
const uint8_t m_brkt[2] = {0x39, 0x0f};
const uint8_t m_nums[10] = {0x3f, 0x06, 0x5b, 0x4f, 0x66,
0x6d, 0x7d, 0x07, 0x7f, 0x6f};
const uint8_t m_char[26] = {0x77, 0x7c, 0x39, 0x5e, 0x79,
0x71, 0x6f, 0x76, 0x30, 0x1e,
0x00, 0x38, 0x00, 0x00, 0x5c,
0x73, 0x67, 0x50, 0x5b, 0x78,
0x3e, 0x1c, 0x00, 0x00, 0x6e,
0x5b};
using namespace std;
using namespace upm;
upm::TM1637::TM1637(int clk_pin, int dio_pin, int bright, M_FAST_GPIO mmio) {
if((m_clk = mraa_gpio_init(clk_pin)) == NULL){
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_gpio_init(clk) failed, invalid pin?");
return;
}
if((m_dio = mraa_gpio_init(dio_pin)) == NULL){
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_gpio_init(dio) failed, invalid pin?");
return;
}
mraa_gpio_dir(m_clk, MRAA_GPIO_OUT);
mraa_gpio_dir(m_dio, MRAA_GPIO_OUT);
// Let the resistors pull the lines high
mraa_gpio_mode(m_clk, MRAA_GPIO_PULLUP);
mraa_gpio_mode(m_dio, MRAA_GPIO_PULLUP);
if(mmio){
if(mraa_gpio_use_mmaped(m_clk, 1) != MRAA_SUCCESS ||
mraa_gpio_use_mmaped(m_dio, 1) != MRAA_SUCCESS){
throw std::runtime_error(std::string(__FUNCTION__) +
": mraa_gpio_use_mmaped() failed");
return;
}
}
mraa_gpio_write(m_clk, 0);
mraa_gpio_write(m_dio, 0);
for (int i = 0; i < M_DISPLAY_DIGITS; i++) {
m_digits[i] = 0x00;
}
setBrightness(bright);
}
upm::TM1637::~TM1637() {
for (int i = 0; i < M_DISPLAY_DIGITS; i++) {
m_digits[i] = 0x00;
}
update();
mraa_gpio_close(m_clk);
mraa_gpio_close(m_dio);
}
mraa_result_t upm::TM1637::write(uint8_t *digits) {
for (int i = 0; i < M_DISPLAY_DIGITS; i++) {
m_digits[i] = digits[i];
}
update();
return MRAA_SUCCESS;
}
mraa_result_t upm::TM1637::write(int d, ...) {
va_list args;
va_start(args, d);
m_digits[0] = (uint8_t)d;
for (int i = 1; i < M_DISPLAY_DIGITS; i++) {
m_digits[i] = (uint8_t)va_arg(args, int);
d++;
}
va_end(args);
update();
return MRAA_SUCCESS;
}
mraa_result_t upm::TM1637::writeAt(int index, char symbol) {
if(index < 0 || index >= M_DISPLAY_DIGITS){
cerr << "TM1637: invalid index in " << __FUNCTION__ << endl;
return MRAA_ERROR_INVALID_PARAMETER;
}
m_digits[index] = encode(symbol);
update();
return MRAA_SUCCESS;
}
mraa_result_t upm::TM1637::write(std::string digits) {
int len = digits.length();
if( len > M_DISPLAY_DIGITS){
len = M_DISPLAY_DIGITS;
}
for (int i = 0; i < len; i++) {
m_digits[i] = encode(digits[i]);
}
update();
return MRAA_SUCCESS;
}
void upm::TM1637::setColon(bool value) {
if(value){
m_digits[1] |= 0x80;
}
else{
m_digits[1] &= 0x7f;
}
update();
}
void upm::TM1637::setBrightness(int value) {
m_brightness = value & 0x07;
update();
}
void upm::TM1637::i2c_start() {
mraa_gpio_write(m_clk, 1);
mraa_gpio_write(m_dio, 1);
mraa_gpio_write(m_dio, 0);
}
void upm::TM1637::i2c_stop() {
mraa_gpio_write(m_clk, 0);
mraa_gpio_write(m_dio, 0);
mraa_gpio_write(m_clk, 1);
mraa_gpio_write(m_dio, 1);
}
void upm::TM1637::i2c_writeByte(uint8_t value) {
for(uint8_t i = 0; i < 8; i++)
{
mraa_gpio_write(m_clk, 0);
if(value & 0x01)
mraa_gpio_write(m_dio, 1);
else
mraa_gpio_write(m_dio, 0);
value >>= 1;
mraa_gpio_write(m_clk, 1);
}
// Ack clock without skew, TM1637 is fast enough
mraa_gpio_write(m_clk, 0);
mraa_gpio_write(m_clk, 1);
mraa_gpio_write(m_clk, 0);
}
void upm::TM1637::update() {
i2c_start();
i2c_writeByte(TM1637_ADDR);
i2c_stop();
i2c_start();
i2c_writeByte(TM1637_REG);
for (int i = 0; i < M_DISPLAY_DIGITS; i++) {
i2c_writeByte(m_digits[i]);
}
i2c_stop();
i2c_start();
i2c_writeByte(TM1637_CMD | m_brightness);
i2c_stop();
}
uint8_t upm::TM1637::encode(char c) {
if(c >= '0' && c <= '9')
return m_nums[(int)c - 48];
if(c >= 'a' && c <= 'z')
return m_char[(int)c - 97];
if(c >= 'A' && c <= 'Z')
return m_char[(int)c - 65];
if(c == '[')
return m_brkt[0];
if(c == ']')
return m_brkt[1];
if(c == '(' || c == ')')
return m_brkt[(int)c - 40];
if(c == '-')
return 0x40;
if(c == '_')
return 0x08;
if(c == '}')
return 0x70;
if(c == '{')
return 0x46;
return 0x00;
}
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