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Updated AVR port to work on actual hardware.

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This commit is contained in:
skarg
2007-09-25 22:08:14 +00:00
parent 7b88a99e0f
commit da79c3826b
6 changed files with 150 additions and 22 deletions
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bacnet-stack/ports/atmega168/dlmstp.c
-5
View File
@@ -216,11 +216,6 @@ static uint8_t TransmitPacketDest;
/* of a frame the node is transmitting: 20 bit times. */
#define Tframe_gap 20
/* The maximum time after the end of the stop bit of the final */
/* octet of a transmitted frame before a node must disable its */
/* EIA-485 driver: 15 bit times. */
#define Tpostdrive 15
/* The maximum time a node may wait after reception of a frame that expects */
/* a reply before sending the first octet of a reply or Reply Postponed */
/* frame: 250 milliseconds. */
bacnet-stack/ports/atmega168/hardware.h
+4 -4
View File
@@ -25,16 +25,16 @@
#ifndef HARDWARE_H
#define HARDWARE_H
/* The processor clock frequency */
#define F_CPU (7372800)
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "avr035.h"
#if !defined(__AVR_ATmega168__)
#error Firmware is configured for ATmega168 only.
#endif
/* The processor clock frequency */
#define FREQ_CPU (7372800)
#endif
bacnet-stack/ports/atmega168/main.c
+57 -3
View File
@@ -36,10 +36,16 @@
/* For porting to IAR, see:
http://www.avrfreaks.net/wiki/index.php/Documentation:AVR_GCC/IarToAvrgcc*/
/* Notice: Fuse Bit Settings
*/
void init(void)
{
/* Initialize the Clock Prescaler for ATmega48/88/168 */
/* The device is shipped with the CKDIV8 Fuse programmed */
/* The default CLKPSx bits are factory set to 0011 */
/* Enbable the Clock Prescaler */
CLKPR = _BV(CLKPCE);
@@ -59,7 +65,7 @@ void init(void)
/* Set the CLKPS3..0 bits to Prescaler of 1 */
CLKPR = 0;
/* Initialize I/O ports */
/* For Port DDRx (Data Direction) Input=1, Output=1 */
/* For Port DDRx (Data Direction) Input=0, Output=1 */
/* For Port PORTx (Bit Value) TriState=0, High=1 */
DDRB = 0;
PORTB = 0;
@@ -79,15 +85,62 @@ void init(void)
/* Configure Timer0 for millisecond timer */
Timer_Initialize();
/* Set the LED ports OFF */
BIT_SET(PORTD,PD4);
BIT_SET(PORTD,PD5);
/* Configure the LED ports as outputs */
BIT_SET(DDRD,DDD4);
BIT_SET(DDRD,DDD5);
/* Enable global interrupts */
sei();
}
static uint8_t NPDU_Timer;
static void NDPU_Timers(void)
{
if (NPDU_Timer) {
NPDU_Timer--;
if (NPDU_Timer == 0) {
BIT_SET(PORTD,PD5);
}
}
}
static void NPDU_LED_On(void)
{
BIT_CLEAR(PORTD,PD5);
NPDU_Timer = 20;
}
void task_milliseconds(void)
{
while (Timer_Milliseconds) {
Timer_Milliseconds--;
/* add other millisecond timer tasks here */
RS485_LED_Timers();
NDPU_Timers();
}
}
static uint8_t Address_Switch;
void input_switch_read(void)
{
uint8_t value;
static uint8_t old_value = 0;
value = BITMASK_CHECK(PINC,0x0F) | (BITMASK_CHECK(PINB,0x07)<<4);
if (value != old_value) {
old_value = value;
} else {
if (old_value != Address_Switch) {
Address_Switch = old_value;
#if defined(BACDL_MSTP)
dlmstp_set_mac_address(Address_Switch);
#endif
}
}
}
@@ -111,7 +164,6 @@ int main(void)
init();
#if defined(BACDL_MSTP)
RS485_Set_Baud_Rate(38400);
dlmstp_set_mac_address(86);
dlmstp_set_max_master(127);
dlmstp_set_max_info_frames(1);
#endif
@@ -121,6 +173,7 @@ int main(void)
iam_send(&Handler_Transmit_Buffer[0]);
#endif
for (;;) {
input_switch_read();
task_milliseconds();
/* other tasks */
/* BACnet handling */
@@ -129,6 +182,7 @@ int main(void)
#if !defined(TEST_MSTP)
npdu_handler(&src, &PDUBuffer[0], pdu_len);
#endif
NPDU_LED_On();
}
}
bacnet-stack/ports/atmega168/rs485.c
+86 -9
View File
@@ -37,6 +37,10 @@
#include "hardware.h"
#include "timer.h"
/* Timers for turning off the TX,RX LED indications */
static uint8_t LED1_Off_Timer;
static uint8_t LED3_Off_Timer;
/* baud rate */
static uint32_t RS485_Baud = 38400;
@@ -52,6 +56,13 @@ static uint32_t RS485_Baud = 38400;
#define Tturnaround (40UL)
/* turnaround_time_milliseconds = (Tturnaround*1000UL)/RS485_Baud; */
/* The maximum time after the end of the stop bit of the final */
/* octet of a transmitted frame before a node must disable its */
/* EIA-485 driver: 15 bit times. */
/* NOTE: AVR lib delay_us limit is 768us; limit is 7bits/9600bps=729us */
#define Tpostdrive1 (7UL)
#define Tpostdrive2 (7UL)
/****************************************************************************
* DESCRIPTION: Initializes the RS485 hardware and variables, and starts in
* receive mode.
@@ -75,8 +86,14 @@ void RS485_Initialize(void)
/* Clear Power Reduction USART0 */
BIT_CLEAR(PRR,PRUSART0);
/* Use port PD2 for RTS - enable and disable of Transceiver Tx/Rx */
/* Set port bit as Output */
/* Set port bit as Output - initially receiving */
BIT_CLEAR(PORTD,PD2);
BIT_SET(DDRD,DDD2);
/* Configure Transmit and Receive LEDs - initially off */
BIT_SET(PORTD,PD6);
BIT_SET(PORTD,PD7);
BIT_SET(DDRD,DDD6);
BIT_SET(DDRD,DDD7);
return;
}
@@ -113,7 +130,7 @@ bool RS485_Set_Baud_Rate(uint32_t baud)
/* 2x speed mode */
BIT_SET(UCSR0A,U2X0);
/* configure baud rate */
UBRR0 = (FREQ_CPU / (8UL * RS485_Baud)) - 1;
UBRR0 = (F_CPU / (8UL * RS485_Baud)) - 1;
/* FIXME: store the baud rate */
break;
default:
@@ -153,11 +170,63 @@ void RS485_Transmitter_Enable(bool enable)
{
if (enable) {
BIT_SET(PORTD,PD2);
} else {
} else {
#if Tpostdrive1
_delay_us(Tpostdrive1/RS485_Baud);
#endif
#if Tpostdrive2
_delay_us(Tpostdrive2/RS485_Baud);
#endif
BIT_CLEAR(PORTD,PD2);
}
}
/****************************************************************************
* DESCRIPTION: Timers for delaying the LED indicators going off
* RETURN: none
* ALGORITHM: none
* NOTES: expected to be called once a millisecond
*****************************************************************************/
void RS485_LED_Timers(void)
{
if (LED1_Off_Timer) {
LED1_Off_Timer--;
if (LED1_Off_Timer == 0) {
BIT_SET(PORTD,PD6);
}
}
if (LED3_Off_Timer) {
LED3_Off_Timer--;
if (LED3_Off_Timer == 0) {
BIT_SET(PORTD,PD7);
}
}
}
/****************************************************************************
* DESCRIPTION: Turn on the LED, and set the off timer to turn it off
* RETURN: none
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
static void RS485_LED1_On(void)
{
BIT_CLEAR(PORTD,PD6);
LED1_Off_Timer = 20;
}
/****************************************************************************
* DESCRIPTION: Turn on the LED, and set the off timer to turn it off
* RETURN: none
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
static void RS485_LED3_On(void)
{
BIT_CLEAR(PORTD,PD7);
LED3_Off_Timer = 20;
}
/****************************************************************************
* DESCRIPTION: Send some data and wait until it is sent
* RETURN: none
@@ -168,6 +237,7 @@ void RS485_Send_Data(
uint8_t * buffer, /* data to send */
uint16_t nbytes) /* number of bytes of data */
{
RS485_LED3_On();
while (nbytes) {
while (!BIT_CHECK(UCSR0A,UDRE0)) {
/* do nothing - wait until Tx buffer is empty */
@@ -176,10 +246,15 @@ void RS485_Send_Data(
buffer++;
nbytes--;
}
while (!BIT_CHECK(UCSR0A,UDRE0)) {
/* do nothing - wait until Tx buffer is empty */
}
/* is the frame sent? */
while (!BIT_CHECK(UCSR0A,TXC0)) {
/* do nothing - wait until the entire frame in the
Transmit Shift Register has been shifted out */
}
BIT_CLEAR(UCSR0A,TXC0);
/* per MSTP spec, sort of */
Timer_Silence_Reset();
}
@@ -204,11 +279,12 @@ bool RS485_ReceiveError(void)
if (BIT_CHECK(UCSR0A,DOR0)) {
ReceiveError = true;
}
/* flush the receive buffer */
if (ReceiveError) {
while (BIT_CHECK(UCSR0A,RXC0)) {
RS485_LED1_On();
/* flush the receive buffer */
do {
dummy_data = UDR0;
}
} while (BIT_CHECK(UCSR0A,RXC0));
}
return ReceiveError;
@@ -222,15 +298,16 @@ bool RS485_ReceiveError(void)
*****************************************************************************/
bool RS485_DataAvailable(uint8_t *data)
{
bool uart_data = false;
bool DataAvailable = false;
/* check for data */
if (BIT_CHECK(UCSR0A,RXC0)) {
*data = UDR0;
uart_data = true;
DataAvailable = true;
RS485_LED1_On();
}
return uart_data;
return DataAvailable;
}
#ifdef TEST_RS485
bacnet-stack/ports/atmega168/rs485.h
+2
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@@ -57,6 +57,8 @@ extern "C" {
uint32_t RS485_Get_Baud_Rate(void);
bool RS485_Set_Baud_Rate(uint32_t baud);
void RS485_LED_Timers(void);
#ifdef __cplusplus
}
#endif /* __cplusplus */
bacnet-stack/ports/atmega168/timer.c
+1 -1
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@@ -30,7 +30,7 @@
/* Prescaling: 1, 8, 64, 256, 1024 */
#define TIMER_PRESCALER 64
/* Count: Timer0 counts up to 0xFF and then signals overflow */
#define TIMER_TICKS (FREQ_CPU/TIMER_PRESCALER/1000)
#define TIMER_TICKS (F_CPU/TIMER_PRESCALER/1000)
#if (TIMER_TICKS > 0xFF)
#error Timer Prescaler value is too small
#endif