Based on 485 how to produce the DMX512 protocol in the beginning of 88 us break the low level signal-CodePudding

Based on a small project to control the lights of the DMX512 protocol control module, I use a cc2530 module, but now the problem is I don't know how to produce a 88 us low level, for the great god answer!

CodePudding user response:

The

refer to the original poster qq_41230794 response:

a small project to control based on the lights of the DMX512 protocol control module, I use a cc2530 module, but now the problem is that I don't know how to produce a low level, 88 us asked the great spirit to solve!

If only read not write, TXD delay Break with pin and MAB is more practical,

CodePudding user response:

(115200, e, 8, 1) send 00 h, is about this time
1 start bit + 8 bits of data calibration=10 + 1 1 e6/115200 * 10=86.81 us

CodePudding user response:

If use NXP LPC11U, can control the LCR registers in the 6th BC (Break control) to control the

 
Void Uart_XmitDmxSlotValues (uint8_t * pbufs, uint16_t nrOfSlots, 
Uint16_t break_time, uint16_t mab_time, 
Bool blocking_write, bool xmit_disc_request) 
{
If (nrOfSlots & gt; 1) 
{
Dmx_xmit_data_done=false; 
Dmx_xmit_data_len=nrOfSlots - 1; 
Rdm_recv_disc_response=xmit_disc_request; 
If (break_time & gt; 0) 
{
LPC_UART - & gt; The LCR |=(1 & lt; <6);/* generate line break for 92 usec */
Bsp_delay_usec (break_time); 
LPC_UART - & gt; The LCR & amp;=~ (1 & lt; <6);/* remove line break for 12 usec */
} 
If (mab_time & gt; 0) bsp_delay_usec (mab_time); 
LPC_UART - & gt; THR=* pBuf++;/* xmit DMX start code */
Dmx_xmit_data=https://bbs.csdn.net/topics/pBuf; 
LPC_UART - & gt; IER |=IER_THRE;/* the Enable THRE interrupt */
If (blocking_write) 
{
while(! Dmx_xmit_data_done); 
Uart_XmitEmpty (); 
} 
} 
}

CodePudding user response:

Let's pull gpio delay method

CodePudding user response:

Upstairs positive solution, time delay, zigbee is also CC2530 you streaking or run?