Hi,
I'm trying to drive some rgb lights that have TM1914 inside. It's a 800Khz signal similar to WS2811 but it is inverted. Anyway, I got it works for a while but the lights immediately switch off.
I attached the original datasheet (in Chinese) and the translation.
Any suggestions?
TM1914A_V1.1.pdf (311 KB)
TM1914A_V1.1_EN.pdf (398 KB)
Bartleboom:
it works for a while but the lights immediately switch off.Any suggestions?
Maybe you could explain the problem without contradicting yourself.
Also post your code and schematic.
Bartleboom:
Hi,
I'm trying to drive some rgb lights that have TM1914 inside. It's a 800Khz signal similar to WS2811 but it is inverted. Anyway, I got it works for a while but the lights immediately switch off.
I attached the original datasheet (in Chinese) and the translation.
Any suggestions?
Hi Paul, I mean that the ic recognize the color I choose (Red is 0xFF, 0x00, 0x00) but after a while it switch off.
The code is as follow:
int8_t pin = 6;
volatile uint8_t *port;
uint8_t pinMask;
uint8_t hi, lo;
void setup() {
pinMode(pin, OUTPUT);
digitalWrite(pin, HIGH);
delay(1000);
port = portOutputRegister(digitalPinToPort(pin));
pinMask = digitalPinToBitMask(pin);
hi = *port | pinMask;
lo = *port & ~pinMask;
}
void loop() {
show();
while (1) {}
}
the function show() send each bit as follow:
void show5(void) {
asm volatile(
// This is bit 1
"st %a[port], %[lo]" "\n\t" // 2 PORT = low (T = 2)
"nop" "\n\t" // 1 (T = 3)
"nop" "\n\t" // 1 (T = 4)
"nop" "\n\t" // 1 (T = 5)
"nop" "\n\t" // 1 (T = 6)
"nop" "\n\t" // 1 (T = 7)
"nop" "\n\t" // 1 (T = 8)
"nop" "\n\t" // 1 (T = 9)
"nop" "\n\t" // 1 (T = 10)
"nop" "\n\t" // 1 (T = 11)
"nop" "\n\t" // 1 (T = 12)
"st %a[port], %[hi]" "\n\t" // 2 PORT = hi (T = 14)
"nop" "\n\t" // 1 (T = 15)
"nop" "\n\t" // 1 (T = 16)
"nop" "\n\t" // 1 (T = 17)
"nop" "\n\t" // 1 (T = 18)
"nop" "\n\t" // 1 (T = 19)
"nop" "\n\t" // 1 (T = 20)
.....
.....
.....
// this is bit 0
"st %a[port], %[lo]" "\n\t" // 2 PORT = low (T = 2)
"nop" "\n\t" // 1 (T = 3)
"nop" "\n\t" // 1 (T = 4)
"nop" "\n\t" // 1 (T = 5)
"nop" "\n\t" // 1 (T = 6)
"st %a[port], %[hi]" "\n\t" // 2 PORT = hi (T = 8)
"nop" "\n\t" // 1 (T = 9)
"nop" "\n\t" // 1 (T = 10)
"nop" "\n\t" // 1 (T = 11)
"nop" "\n\t" // 1 (T = 12)
"nop" "\n\t" // 1 (T = 13)
"nop" "\n\t" // 1 (T = 14)
"nop" "\n\t" // 1 (T = 15)
"nop" "\n\t" // 1 (T = 16)
"nop" "\n\t" // 1 (T = 17)
"nop" "\n\t" // 1 (T = 18)
"nop" "\n\t" // 1 (T = 19)
"nop" "\n\t" // 1 (T = 20)
....
....
....
: [port] "+e" (port)
: [hi] "r" (hi),
[lo] "r" (lo));
}
Keeping in mind that Atmega328p is configured with 16.000.000 clk per second
For 800Khz signal each bit is 1.250 ns (20 clk)
In my sketch I send 9 bytes:
0xFF 0xFF 0xFA 0x00 0x00 0x05 (as per Datasheet Setting Mode DIN Mode)
and then I send 1 pixel display data:
0xFF 0x00 0x00 (Red color)
Then I send the Reset signal which is the Pin High for at least 200uS
What are these lines supposed to do?
hi = *port | pinMask;
lo = *port & ~pinMask;
This line of code
while (1) {}
will stop the code from doing anything until you press reset. So if something happens after some time, it is not because of the code. Something else must be happening.
How many LEDs are connected? How are you powering the circuit?
What are these lines supposed to do?
hi = *port | pinMask;
lo = *port & ~pinMask;
These lines save the value of PORTx register when is HIGH or LOW
this value is passed as argument in the assembly instruction ST
(turn on and off the pin)
This line of code
while (1) {}will stop the code from doing anything until you press reset. So if something happens after some time, it is not because of the code. Something else must be happening.
before the "while" we have one call to show() function which should light on 1 pixel
if I remove the while the lights are always on because it sends always the data to IC
How many LEDs are connected? How are you powering the circuit?
I have two LEDs connected powered with 24V (ground is in common with arduino GND)
Hi, did you get very far with this ?
I have the same chipset on me light strip and im trying to find a way to get it to work with any of the arduino supported ESP chipsets
Bare with me as I'm super new to Arduino, ESP and addressable strip lights, however will catch up quickly.