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max7219.h
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max7219.h
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/**
* stm32tpl -- STM32 C++ Template Peripheral Library
* Visit https://github.com/antongus/stm32tpl for new versions
*
* Copyright (c) 2011-2020 Anton B. Gusev aka AHTOXA
*
* 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.
*
*
* file : max7219.h
* description : MAX7219 LED driver chain class.
*/
#ifndef STM32TPL_MAX7219_INCLUDED
#define STM32TPL_MAX7219_INCLUDED
#include <cstdint>
#include "pin.h"
#include "scmRTOS.h"
/**
* Sample properties for Max7219Chain class template
*/
struct SampleMax7219ChainProps
{
enum
{
CHIP_COUNT = 3, ///<! chips in chain
DEFAULT_BRIGHTNESS = 7, ///<! default brightness (used during initialization)
LATCH_NOPS = 8, ///<! NOP count during LATCH pin active
};
static void Init() {} ///!< hardware initialization of serial connection to chips
static void Latch() {} ///!< latch data to MAX7219 chain
static void ShiftWord(uint16_t) {} ///!< shift one word of data to MAX7219 chain
};
/**
* Max7219Chain class template
*/
template<typename props = SampleMax7219ChainProps>
class TMax7219Chain
{
public:
enum
{
CHIP_COUNT = props::CHIP_COUNT,
DIGITS_PER_CHIP = 8,
DIGIT_COUNT = CHIP_COUNT * DIGITS_PER_CHIP,
DEFAULT_BRIGHTNESS = props::DEFAULT_BRIGHTNESS,
};
void Init();
void SetSleep(bool value) { WriteAll(value ? 0x0C00 : 0x0C01); }
void SetTest(bool value) { WriteAll(value ? 0x0F01 : 0x0F00); }
void SetDecodeMode(uint8_t flags) { WriteAll(0x0900 | flags); }
void SetUsedDigits(uint8_t value) { WriteAll(0x0B00 | value); }
void SetBrightness(unsigned value) { WriteAll(0x0A00 | (value & 0x0F)); }
void SetBrightness(unsigned chipNum, unsigned value);
void Cls();
void Test(int delay = 2);
void SetDigit(unsigned digit, unsigned value);
private:
void WriteAll(uint16_t w);
};
/**
* Initialize MAX7219 chain.
* - turn off sleep
* - turn off test mode
* - set used digits to 0xFF (all used)
* - set decode mode to 0 (off)
* - set brightness to default value
*/
template<typename props>
void TMax7219Chain<props>::Init()
{
props::Init();
SetSleep(false);
SetTest(false);
SetUsedDigits(0xFF);
SetDecodeMode(0x00);
SetBrightness(DEFAULT_BRIGHTNESS);
}
template<typename props>
void TMax7219Chain<props>::SetBrightness(unsigned chipNum, unsigned value)
{
uint16_t w = 0x0A00 | (value & 0x0F);
for (auto i = 0u; i < CHIP_COUNT; ++i)
props::ShiftWord((CHIP_COUNT - 1) - i == chipNum ? w : 0x0000);
props::Latch();
}
/**
* Write command to all chips
* @param w - command to write
*/
template<typename props>
void TMax7219Chain<props>::WriteAll(uint16_t w)
{
for (auto chipNo = 0u; chipNo < CHIP_COUNT; ++chipNo)
props::ShiftWord(w);
props::Latch();
}
/**
* Turn off all LEDs
*/
template<typename props>
void TMax7219Chain<props>::Cls()
{
for (uint16_t digit = 1; digit < 9; digit++)
WriteAll(digit << 8);
}
/**
* Test all LEDS
* @param delay - delay between test steps (in milliseconds)
*/
template<typename props>
void TMax7219Chain<props>::Test(int delay)
{
for (auto chipNo = 0u; chipNo < CHIP_COUNT; ++chipNo)
{
for (auto digit = 0u; digit < DIGITS_PER_CHIP; ++digit)
{
unsigned mask = 1u;
for (auto bit = 0u; bit < 8; ++bit)
{
SetDigit(chipNo * DIGITS_PER_CHIP + digit, mask);
mask <<= 1;
mask |= 1;
OS::sleep(delay);
}
}
for (auto digit = 0u; digit <= DIGITS_PER_CHIP; ++digit)
SetDigit(chipNo * DIGITS_PER_CHIP + digit, 0);
}
}
template<typename props>
void TMax7219Chain<props>::SetDigit(unsigned digit, unsigned value)
{
auto targetChip = digit / DIGITS_PER_CHIP;
auto w = ((digit % DIGITS_PER_CHIP + 1) << 8) | value;
for (auto i = 0u; i < CHIP_COUNT; ++i)
props::ShiftWord((CHIP_COUNT - 1) - i == targetChip ? w : 0x0000);
props::Latch();
}
#endif // STM32TPL_MAX7219_INCLUDED