Added 7-segment display with 595 shift register
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d2ff50a161
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26807a7d16
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#ifndef DISP7SEG_H_INCLUDED
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#define DISP7SEG_H_INCLUDED
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#include <stdint.h>
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extern void DispPutDigit(uint8_t pos, char chr, uint8_t dp);
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extern void ShiftReg_Update(void);
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#endif
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/***************************************************************************//**
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* @file disp7seg.c
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* @brief 7-segment display handling
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*******************************************************************************/
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#include "disp7seg.h"
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#include "main.h"
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static uint8_t ShrBuf[SHR_COUNT] = {0}; // buffer for ext. shift register
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static uint8_t ShrDirty = 1; // update request
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/***************************************************************************//**
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* @brief Write data to external shift register on changes
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*******************************************************************************/
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void ShiftReg_Update() {
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if (ShrDirty == 0) return; // register is up to date
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ShrDirty = 0;
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uint_fast8_t shrsel = SHR_COUNT;
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while (shrsel--) {
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uint8_t reg = ShrBuf[shrsel];
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uint_fast8_t clkcnt;
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for (clkcnt = 0; clkcnt < 8; clkcnt++) {
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SHRCLK_LO();
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if (reg & 0x80) { SHRDIN_HI(); }
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else { SHRDIN_LO(); }
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reg <<= 1; // shift left
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Delay_us(1);
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SHRCLK_HI(); // clock pulse
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Delay_us(1);
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}
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}
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SHRSTR_HI(); // strobe pulse
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SHRCLK_LO();
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SHRDIN_LO();
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Delay_us(1);
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SHRSTR_LO();
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}
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/***************************************************************************//**
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/brief Segment table for 7 segment display
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For ASCII characters range 0x20...0x60
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Segment <--> bit allocation
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/code
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0000
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5 1
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5 1
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6666
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4 2
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4 2
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3333 77
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*******************************************************************************/
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static const uint8_t LcdAscii7segTable[] = {
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0x00, 0x82, 0xA2, 0x5C, 0x6D, 0x00, 0x7F, 0x02, // space ... apostrof
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0x39, 0x0F, 0x00, 0x00, 0x04, 0x40, 0x00, 0x52, // ( ... slash
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0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F, // 0 ... 9
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0x48, 0x48, 0x58, 0x48, 0x4C, 0x53, 0x7B, // : ... @
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0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71, 0x3D, 0x76, // ABCDEFGH
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0x06, 0x1E, 0x7A, 0x38, 0x37, 0x54, 0x3F, 0x73, // IJKLMNOP
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0x67, 0x50, 0x6D, 0x78, 0x3E, 0x3E, 0x3E, 0x76, // QRSTUVWX
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0x6E, 0x5B, 0x39, 0x64, 0x0F, 0x23, 0x08, 0x60, // YZ[\]^_`
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0x5F, 0x7C, 0x58, 0x5E, 0x79, 0x71, 0x6F, 0x74, // abcdefgh
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0x04, 0x1E, 0x7A, 0x06, 0x37, 0x54, 0x5C, 0x73, // ijklmnop
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0x67, 0x50, 0x6D, 0x78, 0x1C, 0x1C, 0x1C, 0x76, // qrstuvwx
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0x6E, 0x5B, 0x39, 0x30, 0x0F, 0x62 // yz{|}~
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};
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/***************************************************************************//**
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* \brief Print characters to 7 segment display
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*******************************************************************************/
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void DispPutDigit(uint8_t pos, char chr, uint8_t dp) {
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if (pos >= SHR_COUNT) return;
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uint8_t* disp_buf = ShrBuf;
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uint8_t segments;
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uint8_t c = chr;
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if (c >= ' ' && c < 127) segments = LcdAscii7segTable[c-' '];
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//else if (c == '°') segments = 0x63;
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else segments = 0;
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if (dp) segments |= 0x80; // decimal point
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uint8_t prevseg = disp_buf[pos];
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disp_buf[pos] = ~segments; // write new digit
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if (prevseg != disp_buf[pos]) { // buffer changed
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ShrDirty = 1; // update request
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}
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}
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