How to change rs232 to RS485 in ZStack-CC2530-2.3.0-1.4.0

yanming70088

We now use ZStack-CC2530-2.3.0-1.4.0, and need CC2530 send and receive data through RS485.if we set the data direction as CC2530 ->RS485 and don't change it, the data send is right. and if we set the direction is RS485 ->CC2530 and don't change it, the data receive also right.

But, when CC2530 need send data to RS485, we set the disrection (CC2530 ->RS485) befor HalUARTWrite(HAL_UART_PORT_0, pData, len);

the dara error is very higher

How to control the RS485 data transceiver direction in zstack？？

over 13 years ago

0 huaili yan over 12 years ago

Prodigy 10 points

hello:

I have also met this problem recently , but i can't solve it , do you know the answer?

thanks

0 yanming70088 over 12 years ago in reply to huaili yan

Prodigy 90 points

use uart Isr mode and change HAL_ISR_FUNCTION( halUart1TxIsr, UTX1_VECTOR )

as follow：

#if defined HAL_SB_BOOT_CODE
static void halUartTxIsr(void);
static void halUartTxIsr(void)
#else
#if (HAL_UART_ISR == 1)
HAL_ISR_FUNCTION( halUart0TxIsr, UTX0_VECTOR )
#else
HAL_ISR_FUNCTION( halUart1TxIsr, UTX1_VECTOR )
#endif
#endif
{
if (isrCfg.txHead == isrCfg.txTail)
{
IEN2 &= ~UTXxIE;
isrCfg.txMT = 1;

MicroWait(1500);
U1CSR|=0x40;
P1_5=0;
}
else
{
U1CSR&=~0x40;
P1_5=1;
UTXxIF = 0;
UxDBUF = isrCfg.txBuf[isrCfg.txHead++];

if (isrCfg.txHead >= HAL_UART_ISR_TX_MAX)
{
isrCfg.txHead = 0;
}
}
}

I used P1_5 for 485 direction control.

0 Ilya Averin over 12 years ago

Expert 1815 points

Hi,

it seems like the time delay between setting the control pin and data transfer is too small. Could you try to increase it? What kind of RS-485 driver do you use?

regards,

Ilya

0 yanming70088 over 12 years ago in reply to Ilya Averin

Prodigy 90 points

max3485

0 Ilya Averin over 12 years ago in reply to yanming70088

Expert 1815 points

We use TI SN65HVD and with 0,05 ms delay between setting the control pin high and the data sending, it works fine at least up to 115200 bit/s.

regards,

Ilya

0 Emanuele Tavelli1 over 10 years ago in reply to Ilya Averin

Prodigy 150 points

Hi,

Can you post the code for use RS485? I do some tests but I can't receive nothing, I think the problem is related to the pin that I should set 0 or 1 to RX or TX.

thank you

Regards,

Emanuele

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How to change rs232 to RS485 in ZStack-CC2530-2.3.0-1.4.0