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Working on DOS port.

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This commit is contained in:
skarg
2007-12-06 23:17:27 +00:00
parent 7622c631af
commit eb72c8cb64
4 changed files with 64 additions and 85 deletions
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bacnet-stack/ports/dos/rs485.c
+9 -52
View File
@@ -35,10 +35,11 @@
#include "timer.h"
/* This file has been customized for use with DOS */
#include "hardware.h"
#include <dos.h>
#include "serial.h"
/* UART */
static volatile AT91S_USART *RS485_Interface = AT91C_BASE_US0;
static char RS485_Port = '2';
/* baud rate */
static int RS485_Baud = 38400;
@@ -64,42 +65,10 @@ static int RS485_Baud = 38400;
void RS485_Initialize(
void)
{
/* Enable the USART0 clock in the Power Management Controller */
volatile AT91PS_PMC pPMC = AT91C_BASE_PMC;
pPMC->PMC_PCER = pPMC->PMC_PCSR | (1 << AT91C_ID_US0);
/* Disable and clear USART0 interrupt
in AIC Interrupt Disable Command Register */
volatile AT91PS_AIC pAIC = AT91C_BASE_AIC;
pAIC->AIC_IDCR = (1 << AT91C_ID_US0);
pAIC->AIC_ICCR = (1 << AT91C_ID_US0);
/* enable the peripheral by disabling the pin in the PIO controller */
*AT91C_PIOA_PDR = AT91C_PA5_RXD0 | AT91C_PA6_TXD0 | AT91C_PA7_RTS0;
RS485_Interface->US_CR = AT91C_US_RSTRX | /* Reset Receiver */
AT91C_US_RSTTX | /* Reset Transmitter */
AT91C_US_RSTSTA | /* Clear status register */
AT91C_US_RXDIS | /* Receiver Disable */
AT91C_US_TXDIS; /* Transmitter Disable */
RS485_Interface->US_MR = AT91C_US_USMODE_RS485 | /* RS-485 Mode - RTS auto assert */
AT91C_US_CLKS_CLOCK | /* Clock = MCK */
AT91C_US_CHRL_8_BITS | /* 8-bit Data */
AT91C_US_PAR_NONE | /* No Parity */
AT91C_US_NBSTOP_1_BIT; /* 1 Stop Bit */
/* set the Time Guard to release RTS after x bit times */
RS485_Interface->US_TTGR = 1;
/* Receiver Time-out disabled */
RS485_Interface->US_RTOR = 0;
/* baud rate */
RS485_Interface->US_BRGR = MCK / 16 / RS485_Baud;
RS485_Interface->US_CR = AT91C_US_RXEN | /* Receiver Enable */
AT91C_US_TXEN; /* Transmitter Enable */
OpenComPort(RS485_Port);
/* FIXME: change to numeric parameters */
InitComPort ( "38400", '8', 'N', '1' );
return;
}
@@ -141,8 +110,7 @@ bool RS485_Set_Baud_Rate(
case 76800:
case 115200:
RS485_Baud = baud;
RS485_Interface->US_BRGR = MCK / 16 / baud;
/* FIXME: store the baud rate */
/* FIXME: store the baud rate */
break;
default:
valid = false;
@@ -176,7 +144,7 @@ void RS485_Turnaround_Delay(
* DESCRIPTION: Enable or disable the transmitter
* RETURN: none
* ALGORITHM: none
* NOTES: The Atmel ARM7 has an automatic enable/disable in RS485 mode.
* NOTES: none
*****************************************************************************/
void RS485_Transmitter_Enable(
bool enable)
@@ -194,19 +162,8 @@ void RS485_Send_Data(
uint8_t * buffer, /* data to send */
uint16_t nbytes)
{ /* number of bytes of data */
/* LED on send */
volatile AT91PS_PIO pPIO = AT91C_BASE_PIOA;
/* LED ON */
pPIO->PIO_CODR = LED1;
/* send all the bytes */
while (nbytes) {
while (!(RS485_Interface->US_CSR & AT91C_US_TXRDY)) {
/* do nothing - wait until Tx buffer is empty */
}
RS485_Interface->US_THR = *buffer;
buffer++;
nbytes--;
}
ComSendData(buffer, nbytes);
while (!(RS485_Interface->US_CSR & AT91C_US_TXRDY)) {
/* do nothing - wait until Tx buffer is empty */
}