Jiří Hudec / M5451

Simple control for ST M5451 LED driver.

Sample usage

#include "mbed.h"
#include "M5451.h"

M5451 m5451(D8, D7);

void toggleOneByOne(){
    for(char i = 0; i < m5451.outputs(); i++){
        m5451.toggleBit(i);
        m5451.update();
        wait_ms(250);
        m5451.toggleBit(i);
    }
}

int main() {
    while(1) {
        m5451.setAllBits(0);
        toggleOneByOne();
        m5451.setAllBits(1);
        toggleOneByOne();
    }
}

Diff: M5451.cpp

Revision:
1:db1e69c22bc6
Parent:
0:b21b3517a1d6
--- a/M5451.cpp	Sun Mar 01 10:20:26 2020 +0000
+++ b/M5451.cpp	Sun Mar 01 11:41:57 2020 +0000
@@ -6,7 +6,7 @@
     _state = 0ULL;
 }
 
-int M5451::outputs() {
+short M5451::outputs() {
     return JIRRICK_M5451_OUTPUTS;
 }
 
@@ -14,16 +14,23 @@
     _state = state;
 }
 
-void M5451::setBit(char position, char value){
-    if (position < JIRRICK_M5451_OUTPUTS)
+void M5451::setBit(short position, short value){
+    if (position >= 0 && position < JIRRICK_M5451_OUTPUTS)
     {
         uint64_t value64 = value;
         _state = (_state & ~(1ULL << position)) | (value64 << position);
     }
 }
 
-void M5451::setAllBits(char value){
-    for(char i = 0; i < JIRRICK_M5451_OUTPUTS; i++){
+void M5451::toggleBit(short position){
+    if (position >= 0 && position < JIRRICK_M5451_OUTPUTS)
+    {
+        _state ^= 1ULL << position;
+    }
+}
+
+void M5451::setAllBits(short value){
+    for(short i = 0; i < JIRRICK_M5451_OUTPUTS; i++){
         setBit(i, value);
     }
 }
@@ -31,8 +38,8 @@
 void M5451::update() {
     _send(1); //START BIT
     uint64_t input = _state;
-    for(char i = 0; i < JIRRICK_M5451_OUTPUTS; i++){
-        char value = (input & 1ULL);
+    for(short i = 0; i < JIRRICK_M5451_OUTPUTS; i++){
+        short value = (input & 1ULL);
         _send(value);
         input = input >> 1;
     }
@@ -42,7 +49,7 @@
     return _state;
 }
 
-void M5451::_send(char bit) {
+void M5451::_send(short bit) {
     _dataPin = (bit % 2);
     wait_us(JIRRICK_M5451_WAIT);
     _clockPin = 1;