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RX/TX RS232 using USART0 & 1 MSP430F1611

Hello everybody !

I am a beginer in MSP430 programing... I have juste finished to code a sofware that generate a a frame and send it to a PC using USART1 (RS232)... Not an hard work :p

Now I would like to receive frames from USART0 and then to Send these frame using USART1... for example :

TXBUF1=3DRXBUF0; (every RX1 interrupt.)

Anyway I have try something : Initialize USART0 and USART1 like this :

#include #include

unsigned char *p2ud; // Global

void main(void) { // USART1 init (transmission) WDTCTL =3D WDTPW + WDTHOLD; // Stop Watchdog P3SEL |=3D 0xC0; // P3.6,7 UART1 BCSCTL1 |=3D XTS; // HF Quartz BCSCTL2 |=3D SELM_3; // MCLK =3D LFXT1 ME2 |=3D UTXE1; // Enable USART1 TX UCTL1 |=3D CHAR; // 8-bit chararcters UTCTL1 |=3D SSEL0; // UCLK =3D ACLK UBR01 =3D 0x1A; // 3MHz/115200 =3D 26.04 -

26 -> h1A

UBR11 =3D 0x00; UMCTL1 =3D 0x00; // Modulation UCTL1 &=3D ~SWRST; // USART State machine init IE2 |=3D UTXIE1; // Enable TX interrupt.

//USART0 init (reception) WDTCTL =3D WDTPW + WDTHOLD; // Arr=EAte le Watchdog P3SEL |=3D 0x30; // P3.4,5 UART0 BCSCTL1 |=3D XTS; // HF Quartz BCSCTL2 |=3D SELM_3; // MCLK =3D LFXT1 ME1 |=3D URXE0; // Enable USART0 RX UCTL0 |=3D CHAR; UTCTL0 |=3D SSEL0; // UCLK =3D ACLK UBR00 =3D 0x1A; // 3MHz/115200 =3D 26.04 ->

26 -> h1A UBR10 =3D 0x00; UMCTL0 =3D 0x00; // Modulation UCTL0 &=3D ~SWRST; // USART State machine init IE1 |=3D URXIE0; // Enable TX interrupt.

_BIS_SR(LPM0_bits + GIE); }

// ISR

#pragma vector=3DUART1TX_VECTOR __interrupt void usart1_tx (void) { _NOP(); }

#pragma vector=3DUART0RX_VECTOR __interrupt void usart0_rx (void) { TXBUF1=3DRXBUF0; _NOP(); }

.=2E. it doesn't work but i'm not surprised... :p I don't if it is the right way to initialize the 2 UART ports...

Is anybody could help me to reach it ?

Thanks

Bobish

Reply to
bdebossoreille
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Note : The protocol used for USART0 is RS485 and for USART1 is RS232...

I looking forward to have informations because I really don't know how to reach this problem...

Reply to
bdebossoreille

Be careful with your language. RS485 and RS232 are hardware specifications, not protocols. You can use the hardware to implement various protocols. For example, you can transfer asynchronously (start/stop bits, limited char bit length) or synchronously (no extra delimiting bits) over either hardware.

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Reply to
CBFalconer

Sorry for the mistake...

The goal of my operation is to write a code that could finally write serial datas into an external flash memory... I would like to do it step by step... That's why I would like to try just to send data from UART0 to UART1 port on the =B5C. If I reach it, I will be able to write data into an external flash...

Could you help tto find the mistake on my code ?

Reply to
bdebossoreille

I've never seen a flash memory with a UART interface. Are you sure you shouldn't be using SPI or I2C?

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Reply to
Grant Edwards

-> 26 -> h1A

First simply get the transmitter going to verify your timing. Perform simple initialization (without interrupts) and then do something like this :

while(1) { while (!(IFG1 & UTXIFG0)); // USART0 TX buffer ready? TXBUF0 =3D 'X'; }

First step is to see a bunch of 'X's recieved at the PC. Then duplicate timing settings for RX.

Reply to
Ivanna Pee

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