Shivanand Gowda
OSL10564_74HC595
Fork of
OSL10564_74HC595
by 
Kenji Arai
Diff: 7segLed_HC595.cpp
- Revision:
- 0:3373357a49f4
- Child:
- 1:a3755014b7f1
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/7segLed_HC595.cpp Mon Jan 22 10:23:24 2018 +0000
@@ -0,0 +1,230 @@
+/*
+ * Mbed Library / Akizuki 7-segment LED driver [OSL10564-74HC595-x]
+ * http://akizukidenshi.com/catalog/g/gM-12643/
+ *
+ * Copyright (c) 2018 Kenji Arai / JH1PJL
+ * http://www.page.sannet.ne.jp/kenjia/index.html
+ * http://mbed.org/users/kenjiArai/
+ * Created: January 7th, 2018
+ * Revised: January 22nd, 2018
+ */
+
+#include "7segLed_HC595.h"
+
+SevenSegLed::SevenSegLed
+( PinName sdo, PinName sclk, PinName latch, PinName bright,
+ uint8_t num_of_digit
+)
+ : spi_(sdo, NC, sclk), latch_(latch), pwm_(bright)
+{
+ num = num_of_digit;
+ dot_inf = 0;
+ zerosuppress = false;
+ spi_.frequency(1000000);
+ spi_.format(8,0);
+ latch_ = 0;
+ pwm_.period_ms(2);
+ bright_data = 1.0f;
+ pwm_.pulsewidth_us(bright_data);
+}
+
+void SevenSegLed::put_num(int32_t dt)
+{
+ wrk = dt;
+ for(uint32_t i = 0; i < num; i++) {
+ buf[i] = wrk % 10; // set each digit value
+ wrk /= 10; // next digit
+ }
+ num_mode = true; // set number display mode
+ seven_seg_n_digt(); // convert to seven segment element and send SPI
+}
+
+void SevenSegLed::put_ascii(const char *data)
+{
+ char dt;
+
+ dot_inf = 0; // clear all dot
+ for (uint32_t i = 0; i < BUFFER_SIZE; i++) {
+ buf[i] = 0;
+ }
+ int32_t po = num - 1;
+ for(uint32_t pi = 0; ; pi++) {
+ dt = *(data + pi);
+ //pc.putc(dt);
+ if (dt == 0) {
+ break; // end of strings
+ }
+ if (dt == '.') { // check dot
+ if (pi == 0) {
+ buf[po] = 0;
+ po--;
+ dot_inf |= 1U << num - 1; // set dot
+ } else {
+ dot_inf |= 1U << (po + 1); // set dot
+ }
+ pi++;
+ dt = *(data + pi);
+ }
+ buf[po] = dt - '0';// convert ASCII number to value
+ po--;
+ if (po == -1) {
+ break;
+ }
+ }
+ num_mode = false; // set none number display mode
+ seven_seg_n_digt(); // convert to seven segment element and send SPI
+}
+
+void SevenSegLed::put_raw(uint8_t *data)
+{
+ for(uint32_t i = 0; i < num; i++) {
+ uint8_t dt = *(data + i);
+ if (dt == 0) {
+ break;
+ }
+ seg[i] = dt;
+ }
+ spi_out();
+}
+
+void SevenSegLed::put_dot(uint16_t position)
+{
+ dot_inf = position;
+}
+
+void SevenSegLed::clear_all_dot()
+{
+ dot_inf = 0;
+}
+
+void SevenSegLed::zero_suppress(bool mode)
+{
+ zerosuppress = mode;
+}
+
+void SevenSegLed::brightness(float bright)
+{
+ bright_data = bright;
+ pwm_.pulsewidth_us((int)(2000 * (1.0f - bright)));
+}
+
+void SevenSegLed::frequency(int32_t freq)
+{
+ spi_.frequency((int)freq);
+}
+
+void SevenSegLed::seven_seg_n_digt()
+{
+ uint8_t const seg_bit[10] =
+ {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7c, 0x27, 0x7f, 0x67};
+ // 0 1 2 3 4 5 6 7 8 9
+
+ for(uint32_t i = 0; i < num; i++) {
+ seg[i] = seg_bit[buf[i]]; // convert number to segment data
+ }
+ if ((num_mode == true) && (zerosuppress == true)) { // zero suppress
+ for(uint32_t i = 0; i < num; i++) {
+ if (seg[num -1 - i] == 0x3f) { // if zero then zero suppress
+ if ((num -1 - i) == 0) {
+ break;
+ }
+ seg[num -1 - i] = 0;
+ } else {
+ break;
+ }
+ }
+ }
+ set_dot();
+ spi_out();
+}
+
+void SevenSegLed::set_dot()
+{
+ for(uint8_t i = 0; i < num; i++) {
+ if ((dot_inf >> i) & 0x0001) { // check dot request
+ seg[i] |= 0x80; // add dot
+ }
+ }
+ for(uint8_t i = 0; i < num; i++) {
+ if (seg[num -1 - i] & 0x80) { // check dot is on or off
+ if (seg[num -1 - i] == 0x80) { // did zero suppress condition
+ seg[num -1 - i] = 0xbf; // set zero+dot
+ for(i++; i < num; i++) {
+ if (seg[num -1 - i] == 0) { // check zero suppress
+ seg[num -1 - i] = 0x3f; // set zero
+ }
+ }
+ break;
+ }
+ }
+ }
+}
+
+void SevenSegLed::spi_out()
+{
+ pwm_.pulsewidth_us(0);
+ for(uint32_t i = 0; i < num; i++) {
+ spi_.write(seg[i]); // send SPI line
+ }
+ latch_ = 1; // set latch pulse
+ wait_us(2);
+ latch_ = 0;
+ pwm_.pulsewidth_us((int)(2000 * (1.0f - bright_data)));
+}
+
+//------------------------------------------------------------------------------
+// Alphabet on 7segment
+// refernce
+// WentWayUp: WebLog
+// http://wentwayup.tamaliver.jp/e400000.html
+//------------------------------------------------------------------------------
+
+#define OFFSET 0x20
+
+char const alphabet_7seg[] = {
+ // space
+ 0x00,
+ // ! " # $ % & ' ( ) *
+ 0x0a, 0x22, 0x7e, 0x2d, 0x24, 0x3c, 0x20, 0x61, 0x43, 0x63,
+ // + , - . /
+ 0x44, 0x0c, 0x40, 0x10, 0x52,
+ // 0 1 2 3 4 5 6 7 8 9
+ 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7c, 0x07, 0x7f, 0x67,
+ // : ; < = > ?
+ 0x09, 0x51, 0x59, 0x48, 0x4d, 0x4b,
+ // @
+ 0x5f,
+ // A B C D E F G H I J (another C=0x39)
+ 0x77, 0x7c, 0x58, 0x5e, 0x79, 0x71, 0x3d, 0x74, 0x04, 0x1e,
+ // K L M N O P Q R S T
+ 0x75, 0x38, 0x55, 0x54, 0x5c, 0x73, 0x6b, 0x50, 0x6c, 0x78,
+ // U V W X Y Z (another W=0x7e)
+ 0x1c, 0x1d, 0x2a, 0x49, 0x6e, 0x1b,
+ // [ \ ] ^ _
+ 0x39, 0x64, 0x0f, 0x23, 0x08,
+ // `
+ 0x02,
+ // a b c d e f g h i j
+ 0x77, 0x7c, 0x58, 0x5e, 0x79, 0x71, 0x3d, 0x74, 0x04, 0x1e,
+ // k l m n o p q r s t
+ 0x75, 0x38, 0x55, 0x54, 0x5c, 0x73, 0x6b, 0x50, 0x6c, 0x78,
+ // u v w x y z
+ 0x1c, 0x1d, 0x2a, 0x49, 0x6e, 0x1b,
+ // { | } ~
+ 0x46, 0x30, 0x70, 0x01
+};
+
+void SevenSegLed::put_strings(const char *data)
+{
+ for(uint32_t i = 0; i < num; i++) {
+ char c = *(data + i);
+ if (c <= OFFSET) { // control charcters
+ seg[num -1 - i] = 0;
+ } else if ( c > '~') { // over '~' characters
+ seg[num -1 - i] = 0;
+ } else { // serach table
+ seg[num -1 - i] = alphabet_7seg[c - OFFSET];
+ }
+ }
+ spi_out();
+}