MAX7219/MAX7221 dirver + example
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UncleRus
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6 changed files with 383 additions and 0 deletions
3
examples/max7219_7seg/Makefile
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3
examples/max7219_7seg/Makefile
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PROGRAM = max7219_7seg
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EXTRA_COMPONENTS = extras/max7219
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include ../../common.mk
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52
examples/max7219_7seg/main.c
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52
examples/max7219_7seg/main.c
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/*
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* Example of using MAX7219 driver with 7 segment displays
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*
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* Part of esp-open-rtos
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* Copyright (C) 2017 Ruslan V. Uss <unclerus@gmail.com>
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* BSD Licensed as described in the file LICENSE
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*/
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#include <esp/uart.h>
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#include <espressif/esp_common.h>
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#include <stdio.h>
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#include <max7219/max7219.h>
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#include <FreeRTOS.h>
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#include <task.h>
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#include <stdio.h>
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#include <esp/hwrand.h>
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#define CS_PIN 5
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#define DELAY 2000
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static max7219_display_t disp = {
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.cs_pin = CS_PIN,
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.digits = 8,
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.cascade_size = 1,
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.mirrored = true
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};
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void user_init(void)
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{
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uart_set_baud(0, 115200);
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printf("SDK version:%s\n", sdk_system_get_sdk_version());
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max7219_init(&disp);
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//max7219_set_decode_mode(&disp, true);
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char buf[9];
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while (true)
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{
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max7219_clear(&disp);
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max7219_draw_text(&disp, 0, "7219LEDS");
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vTaskDelay(DELAY / portTICK_PERIOD_MS);
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max7219_clear(&disp);
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sprintf(buf, "%2.4f A", 34.6782);
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max7219_draw_text(&disp, 0, buf);
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vTaskDelay(DELAY / portTICK_PERIOD_MS);
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max7219_clear(&disp);
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sprintf(buf, "%08x", hwrand());
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max7219_draw_text(&disp, 0, buf);
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vTaskDelay(DELAY / portTICK_PERIOD_MS);
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}
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}
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7
extras/max7219/component.mk
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7
extras/max7219/component.mk
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# include it as 'max7219/max7219.h'
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INC_DIRS += $(max7219_ROOT)..
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# args for passing into compile rule generation
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max7219_SRC_DIR = $(max7219_ROOT)
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$(eval $(call component_compile_rules,max7219))
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189
extras/max7219/max7219.c
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189
extras/max7219/max7219.c
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/*
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* Driver for MAX7219/MAX7221
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* Serially Interfaced, 8-Digit LED Display Drivers
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*
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* Part of esp-open-rtos
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* Copyright (C) 2017 Ruslan V. Uss <unclerus@gmail.com>
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* BSD Licensed as described in the file LICENSE
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*/
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#include "max7219.h"
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#include <esp/spi.h>
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#include <esp/gpio.h>
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#include <string.h>
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#include "max7219_priv.h"
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#define SPI_BUS 1
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//#define MAX7219_DEBUG
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#ifdef MAX7219_DEBUG
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#include <stdio.h>
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#define debug(fmt, ...) printf("%s: " fmt "\n", "MAX7219", ## __VA_ARGS__)
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#else
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#define debug(fmt, ...)
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#endif
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#define ALL_CHIPS 0xff
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#define ALL_DIGITS 8
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#define REG_DIGIT_0 (1 << 8)
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#define REG_DECODE_MODE (9 << 8)
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#define REG_INTENSITY (10 << 8)
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#define REG_SCAN_LIMIT (11 << 8)
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#define REG_SHUTDOWN (12 << 8)
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#define REG_DISPLAY_TEST (15 << 8)
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#define VAL_CLEAR_BCD 0x0f
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#define VAL_CLEAR_NORMAL 0x00
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static const spi_settings_t bus_settings = {
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.mode = SPI_MODE0,
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.freq_divider = SPI_FREQ_DIV_10M,
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.msb = true,
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.minimal_pins = true,
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.endianness = SPI_BIG_ENDIAN
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};
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static void send(const max7219_display_t *disp, uint8_t chip, uint16_t value)
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{
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uint16_t buf[MAX7219_MAX_CASCADE_SIZE] = { 0 };
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if (chip == ALL_CHIPS)
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{
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for (uint8_t i = 0; i < disp->cascade_size; i++)
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buf[i] = value;
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}
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else buf[chip] = value;
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spi_settings_t old_settings;
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spi_get_settings(SPI_BUS, &old_settings);
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spi_set_settings(SPI_BUS, &bus_settings);
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gpio_write(disp->cs_pin, false);
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spi_transfer(SPI_BUS, buf, NULL, disp->cascade_size, SPI_16BIT);
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gpio_write(disp->cs_pin, true);
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spi_set_settings(SPI_BUS, &old_settings);
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}
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bool max7219_init(max7219_display_t *disp)
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{
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if (!disp->cascade_size || disp->cascade_size > MAX7219_MAX_CASCADE_SIZE)
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{
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debug("Invalid cascade size %d", disp->cascade_size);
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return false;
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}
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uint8_t max_digits = disp->cascade_size * ALL_DIGITS;
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if (!disp->digits || disp->digits > max_digits)
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{
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debug("Invalid digits count %d, max %d", disp->cascade_size, max_digits);
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return false;
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}
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gpio_enable(disp->cs_pin, GPIO_OUTPUT);
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gpio_write(disp->cs_pin, true);
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// Shutdown all chips
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max7219_set_shutdown_mode(disp, true);
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// Disable test
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send(disp, ALL_CHIPS, REG_DISPLAY_TEST);
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// Set max scan limit
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send(disp, ALL_CHIPS, REG_SCAN_LIMIT | (ALL_DIGITS - 1));
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// Set normal decode mode & clear display
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max7219_set_decode_mode(disp, false);
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// Set minimal brightness
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max7219_set_brightness(disp, 0);
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// Wake up
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max7219_set_shutdown_mode(disp, false);
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return true;
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}
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void max7219_set_decode_mode(max7219_display_t *disp, bool bcd)
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{
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disp->bcd = bcd;
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send(disp, ALL_CHIPS, REG_DECODE_MODE | (bcd ? 0xff : 0));
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max7219_clear(disp);
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}
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void max7219_set_brightness(const max7219_display_t *disp, uint8_t value)
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{
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send(disp, ALL_CHIPS, REG_INTENSITY | (value > MAX7219_MAX_BRIGHTNESS ? MAX7219_MAX_BRIGHTNESS : value));
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}
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void max7219_set_shutdown_mode(const max7219_display_t *disp, bool shutdown)
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{
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send(disp, ALL_CHIPS, REG_SHUTDOWN | !shutdown);
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}
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bool max7219_set_digit(const max7219_display_t *disp, uint8_t digit, uint8_t val)
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{
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if (digit >= disp->digits)
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{
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debug("Invalid digit: %d", digit);
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return false;
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}
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if (disp->mirrored)
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digit = disp->digits - digit - 1;
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uint8_t c = digit / ALL_DIGITS;
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uint8_t d = digit % ALL_DIGITS;
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send(disp, c, (REG_DIGIT_0 + ((uint16_t)d << 8)) | val);
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return true;
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}
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void max7219_clear(const max7219_display_t *disp)
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{
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uint8_t val = disp->bcd ? VAL_CLEAR_BCD : VAL_CLEAR_NORMAL;
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for (uint8_t i = 0; i < ALL_DIGITS; i++)
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send(disp, ALL_CHIPS, (REG_DIGIT_0 + ((uint16_t)i << 8)) | val);
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}
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inline static uint8_t get_char(const max7219_display_t *disp, char c)
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{
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if (disp->bcd)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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switch (c)
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{
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case '-':
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return 0x0a;
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case 'E':
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case 'e':
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return 0x0b;
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case 'H':
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case 'h':
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return 0x0c;
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case 'L':
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case 'l':
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return 0x0d;
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case 'P':
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case 'p':
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return 0x0e;
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}
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return VAL_CLEAR_BCD;
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}
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return font_7seg[(c - 0x20) & 0x7f];
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}
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void max7219_draw_text(const max7219_display_t *disp, uint8_t pos, const char *s)
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{
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while (s && pos < disp->digits)
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{
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uint8_t c = get_char(disp, *s);
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if (*(s + 1) == '.')
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{
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c |= 0x80;
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s++;
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}
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max7219_set_digit(disp, pos, c);
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pos++;
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s++;
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}
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}
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96
extras/max7219/max7219.h
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96
extras/max7219/max7219.h
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/*
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* Driver for MAX7219/MAX7221
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* Serially Interfaced, 8-Digit LED Display Drivers
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*
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* Part of esp-open-rtos
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* Copyright (C) 2017 Ruslan V. Uss <unclerus@gmail.com>
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* BSD Licensed as described in the file LICENSE
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*/
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#ifndef EXTRAS_MAX7219_H_
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#define EXTRAS_MAX7219_H_
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#include <stdint.h>
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define MAX7219_MAX_CASCADE_SIZE 8
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#define MAX7219_MAX_BRIGHTNESS 31
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/**
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* Display descriptor
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*/
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typedef struct
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{
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uint8_t cs_pin; //!< GPIO connected to CS/LOAD pin
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uint8_t digits; //!< Accessible digits in 7seg. Up to cascade_size * 8
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uint8_t cascade_size; //!< Up to 8 MAX721xx cascaded
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bool mirrored; //!< true for horizontally mirrored displays
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bool bcd;
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} max7219_display_t;
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/**
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* Initialize display: switch it to normal operation from shutdown mode,
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* set scan limit to the max and clear
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* @param disp Pointer to display descriptor
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* @return false if error occured
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*/
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bool max7219_init(max7219_display_t *disp);
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/**
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* Set decode mode and clear display
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* @param disp Pointer to display descriptor
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* @param bcd true to set BCD decode mode, false to normal
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*/
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void max7219_set_decode_mode(max7219_display_t *disp, bool bcd);
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/**
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* Set display brightness
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* @param disp Pointer to display descriptor
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* @param value Brightness value, 0..MAX7219_MAX_BRIGHTNESS
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*/
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void max7219_set_brightness(const max7219_display_t *disp, uint8_t value);
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/**
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* Shutdown display or set it to normal mode
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* @param disp Pointer to display descriptor
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* @param shutdown Shutdown display if true
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*/
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void max7219_set_shutdown_mode(const max7219_display_t *disp, bool shutdown);
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/**
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* Write data to display digit
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* @param disp Pointer to display descriptor
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* @param digit Digit index, 0..disp->digits - 1
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* @param val Data
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* @return false if error occured
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*/
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bool max7219_set_digit(const max7219_display_t *disp, uint8_t digit, uint8_t val);
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/**
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* Clear display
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* @param disp Pointer to display descriptor
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*/
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void max7219_clear(const max7219_display_t *disp);
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/**
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* Draw text.
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* Currently only 7-segment displays supported
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* @param disp Pointer to display descriptor
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* @param pos Start digit
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* @param s Text
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*/
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void max7219_draw_text(const max7219_display_t *disp, uint8_t pos, const char *s);
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#ifdef __cplusplus
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extern "C"
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}
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#endif
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#endif /* EXTRAS_MAX7219_H_ */
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36
extras/max7219/max7219_priv.h
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36
extras/max7219/max7219_priv.h
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/*
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* Driver for MAX7219/MAX7221
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* Serially Interfaced, 8-Digit LED Display Drivers
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*
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* Part of esp-open-rtos
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* Copyright (C) 2017 Ruslan V. Uss <unclerus@gmail.com>
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* BSD Licensed as described in the file LICENSE
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*/
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#ifndef EXTRAS_MAX7219_PRIV_H_
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#define EXTRAS_MAX7219_PRIV_H_
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static const uint8_t font_7seg[] = {
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/* ' ' ! " # $ % & ' ( ) */
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0x00, 0x00, 0x22, 0x00, 0x00, 0x00, 0x00, 0x02, 0x4e, 0x78,
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/* * + , - . / 0 1 2 3 */
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x30, 0x6d, 0x79,
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/* 4 5 6 7 8 9 : ; < = */
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0x33, 0x5b, 0x5f, 0x70, 0x7f, 0x7b, 0x00, 0x00, 0x0d, 0x09,
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/* > ? @ A B C D E F G */
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0x19, 0x65, 0x00, 0x77, 0x1f, 0x4e, 0x3d, 0x4f, 0x47, 0x5e,
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/* H I J K L M N O P Q */
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0x37, 0x06, 0x38, 0x57, 0x0e, 0x76, 0x15, 0x1d, 0x67, 0x73,
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/* R S T U V W X Y Z [ */
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0x05, 0x5b, 0x0f, 0x1c, 0x3e, 0x2a, 0x49, 0x3b, 0x6d, 0x4e,
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/* \ ] ^ _ ` a b c d e */
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0x00, 0x78, 0x00, 0x08, 0x02, 0x77, 0x1f, 0x4e, 0x3d, 0x4f,
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/* f g h i j k l m n o */
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0x47, 0x5e, 0x37, 0x06, 0x38, 0x57, 0x0e, 0x76, 0x15, 0x1d,
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/* p q r s t u v w x y */
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0x67, 0x73, 0x05, 0x5b, 0x0f, 0x1c, 0x3e, 0x2a, 0x49, 0x3b,
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/* z { | } ~ */
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0x6d, 0x4e, 0x06, 0x78, 0x00
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};
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#endif /* EXTRAS_MAX7219_PRIV_H_ */
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