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bacnet_stack/ports/stm32f4xx/ubasic-port.c
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/**
* @file
* @brief Example uBASIC-Plus porting layer for the uBASIC-Plus interpreter
* for STM32F4xx NUCLIO board
* @author Steve Karg
* @date 2025
* @copyright SPDX-License-Identifier: MIT
*/
#include <stdio.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <limits.h>
#include <ctype.h>
#include "bacnet/basic/object/ai.h"
#include "bacnet/basic/object/ao.h"
#include "bacnet/basic/object/av.h"
#include "bacnet/basic/object/bi.h"
#include "bacnet/basic/object/bo.h"
#include "bacnet/basic/object/bv.h"
#include "bacnet/basic/object/device.h"
#include "bacnet/basic/object/ms-input.h"
#include "bacnet/basic/object/mso.h"
#include "bacnet/basic/object/msv.h"
#include "bacnet/basic/program/ubasic/ubasic.h"
#include "bacnet/basic/sys/mstimer.h"
#include "bacnet/wp.h"
#include "led.h"
#if defined(UBASIC_SCRIPT_HAVE_PRINT_TO_SERIAL)
/**
* @brief Write a buffer to the serial port
* @param msg Pointer to the buffer to write
* @param n Number of bytes to write
*/
static void serial_write(const char *msg, uint16_t n)
{
(void)msg;
(void)n;
}
/**
* @brief Gather key presses until new-line is recieved or buffer is full
* @return return the next byte from the input stream, or EOF(-1) if no byte is
* available
*/
static int serial_getc(void)
{
int ch = -1;
return ch;
}
#endif
#if defined(UBASIC_SCRIPT_HAVE_HARDWARE_EVENTS)
static uint32_t Event_Mask;
/**
* @brief Hardware event status bit
* @param bit Event bit
* @return 1 if the event is set, 0 otherwise
*/
static int8_t hw_event(uint8_t bit)
{
if (bit < 32) {
if (Event_Mask & (1UL << bit)) {
return 1; // Event is set
}
}
return 0; // Event is not set
}
/**
* @brief Clear a hardware event state bit
* @param bit Event bit
*/
static void hw_event_clear(uint8_t bit)
{
if (bit < 32) {
Event_Mask &= ~(1UL << bit);
}
}
#endif
#if defined(UBASIC_SCRIPT_HAVE_STORE_VARS_IN_FLASH)
static uint8_t EEPROM_Buffer[256];
/**
* @brief Read some data from the EEPROM
* @param start_address EEPROM starting memory address
* @param buffer data to store
* @param length number of bytes of data to read
*/
static size_t
eepromRead(uint16_t start_address, uint8_t *buffer, uint16_t length)
{
size_t bytes_read = 0;
uint16_t i = 0;
for (i = 0; i < length; i++) {
if (start_address + i < sizeof(EEPROM_Buffer)) {
buffer[i] = EEPROM_Buffer[start_address + i];
bytes_read++;
} else {
break;
}
}
return bytes_read;
}
/**
* @brief Write some data to the EEPROM
* @param start_address EEPROM starting memory address
* @param buffer data to send
* @param length number of bytes of data
*/
static size_t
eepromWrite(uint16_t start_address, uint8_t *buffer, uint16_t length)
{
size_t bytes_written = 0;
uint16_t i = 0;
for (i = 0; i < length; i++) {
if (start_address + i < sizeof(EEPROM_Buffer)) {
EEPROM_Buffer[start_address + i] = buffer[i];
bytes_written++;
} else {
break;
}
}
return bytes_written;
}
#define UBASIC_FLASH_PAGE_SIZE 256
/**
* @brief Write a variable to the EEPROM
* @param Name Variable name
* @param Vartype Variable type
* @param datalen_bytes Data length in bytes
* @param dataptr Pointer to the data
*/
static void variable_write(
uint8_t Name, uint8_t vartype, uint8_t datalen_bytes, uint8_t *dataptr)
{
// Calculate the starting address based on variable name
uint16_t start_address = Name * UBASIC_FLASH_PAGE_SIZE;
uint8_t buffer[UBASIC_FLASH_PAGE_SIZE];
// Prepare the buffer with the variable type and data length
buffer[0] = vartype; // First byte is the variable type
buffer[1] = datalen_bytes; // Second byte is the data length
for (uint8_t i = 0; i < datalen_bytes; i++) {
buffer[i + 2] = dataptr[i]; // Copy the actual data into the buffer
}
// Write the buffer to EEPROM
eepromWrite(start_address, buffer, datalen_bytes + 2);
}
/**
* @brief Read a variable from the EEPROM
* @param Name Variable name
* @param Vartype Variable type
* @param dataptr Pointer to store the data
* @param datalen Pointer to store the data length
*/
static void
variable_read(uint8_t Name, uint8_t vartype, uint8_t *dataptr, uint8_t *datalen)
{
// Calculate the starting address based on variable name
uint8_t buffer[UBASIC_FLASH_PAGE_SIZE] = { 0 };
uint16_t start_address = Name * UBASIC_FLASH_PAGE_SIZE;
// Read the data from EEPROM
eepromRead(start_address, buffer, UBASIC_FLASH_PAGE_SIZE);
// Check if the variable type matches
if (buffer[0] == vartype) {
*datalen = buffer[1]; // Get the data length
for (uint8_t i = 0; i < *datalen; i++) {
dataptr[i] =
buffer[i + 2]; // Copy the actual data into the provided pointer
}
} else {
*datalen = 0; // If type does not match, set length to 0
}
}
#endif
#if ( \
defined(UBASIC_SCRIPT_HAVE_TICTOC_CHANNELS) || \
defined(UBASIC_SCRIPT_HAVE_SLEEP) || \
defined(UBASIC_SCRIPT_HAVE_INPUT_FROM_SERIAL))
/* defined in mstimer.h */
#endif
#if defined(UBASIC_SCRIPT_HAVE_RANDOM_NUMBER_GENERATOR)
/**
* @brief Generate a random number
* @param size Size of the random number in bits
* @return Random number size-bits wide
*/
static uint32_t random_uint32(uint8_t size)
{
uint32_t value = 0, grains = 0;
uint8_t k, i;
static bool initialized = false;
if (!initialized) {
srand(0);
initialized = true;
}
for (k = 0; k < 4; k++) {
grains = 0;
for (i = 0; i < (size >> 1); i++) {
/* Two LS bits are most likely most random */
grains |= (rand() & 0x00000003) << (2 * i);
}
value ^= grains;
}
return value;
}
#endif
#if defined(UBASIC_SCRIPT_HAVE_PWM_CHANNELS)
static int32_t dutycycle_pwm_ch[UBASIC_SCRIPT_HAVE_PWM_CHANNELS];
/**
* @brief Configure the PWM
* @param psc Prescaler
* @param per Period
*/
static void pwm_config(uint16_t psc, uint16_t per)
{
(void)psc;
(void)per;
}
/**
* @brief Write a value to the PWM
* @param ch Channel
* @param dutycycle Duty cycle
*/
static void pwm_write(uint8_t ch, int32_t dutycycle)
{
if (ch < UBASIC_SCRIPT_HAVE_PWM_CHANNELS) {
dutycycle_pwm_ch[ch] = dutycycle;
}
}
/**
* @brief Read a value from the PWM
* @param ch Channel
* @return Duty cycle
*/
static int32_t pwm_read(uint8_t ch)
{
if (ch < UBASIC_SCRIPT_HAVE_PWM_CHANNELS) {
return dutycycle_pwm_ch[ch];
}
return 0;
}
#endif
#if defined(UBASIC_SCRIPT_HAVE_ANALOG_READ)
/**
* @brief Configure the ADC
* @param sampletime Sample time
* @param nreads Number of reads
*/
static void adc_config(uint8_t sampletime, uint8_t nreads)
{
(void)sampletime;
(void)nreads;
}
/**
* @brief Read a value from the ADC
* @param channel Channel
* @return ADC value
*/
static int32_t adc_read(uint8_t channel)
{
return (int32_t)random_uint32(12);
}
#endif
#if defined(UBASIC_SCRIPT_HAVE_GPIO_CHANNELS)
/**
* @brief Configure the GPIO
* @param ch Channel
* @param mode Mode
* @param freq Frequency
*/
static void gpio_config(uint8_t ch, int8_t mode, uint8_t freq)
{
(void)ch;
(void)mode;
(void)freq;
}
/**
* @brief Write a value to the GPIO
* @param ch Channel
* @param pin_state Pin state
*/
static void gpio_write(uint8_t ch, uint8_t pin_state)
{
unsigned int led_index;
if (ch == 0) {
return;
}
/* adjust for zero based index */
led_index = ch - 1;
if (pin_state) {
led_on(led_index);
} else {
led_off(led_index);
}
}
/**
* @brief Read a value from the GPIO
* @param ch Channel
* @return GPIO value
*/
static int32_t gpio_read(uint8_t ch)
{
return 0;
}
#endif
#if defined(UBASIC_SCRIPT_HAVE_BACNET)
/**
* @brief Create a BACnet object
* @param object_type Object type
* @param instance Object instance
* @param object_name Object name
*/
static void
bacnet_create_object(uint16_t object_type, uint32_t instance, char *object_name)
{
uint32_t r;
switch (object_type) {
case OBJECT_ANALOG_INPUT:
if (!Analog_Input_Valid_Instance(instance)) {
r = Analog_Input_Create(instance);
if (r == instance) {
Analog_Input_Name_Set(instance, strdup(object_name));
}
}
break;
case OBJECT_ANALOG_OUTPUT:
if (!Analog_Output_Valid_Instance(instance)) {
r = Analog_Output_Create(instance);
if (r == instance) {
Analog_Output_Name_Set(instance, strdup(object_name));
}
}
break;
case OBJECT_ANALOG_VALUE:
if (!Analog_Value_Valid_Instance(instance)) {
r = Analog_Value_Create(instance);
if (r == instance) {
Analog_Value_Name_Set(instance, strdup(object_name));
}
}
break;
case OBJECT_BINARY_INPUT:
if (!Binary_Input_Valid_Instance(instance)) {
r = Binary_Input_Create(instance);
if (r == instance) {
Binary_Input_Name_Set(instance, strdup(object_name));
}
}
break;
case OBJECT_BINARY_OUTPUT:
if (!Binary_Output_Valid_Instance(instance)) {
r = Binary_Output_Create(instance);
if (r == instance) {
Binary_Output_Name_Set(instance, strdup(object_name));
}
}
break;
case OBJECT_BINARY_VALUE:
if (!Binary_Value_Valid_Instance(instance)) {
r = Binary_Value_Create(instance);
if (r == instance) {
Binary_Value_Name_Set(instance, strdup(object_name));
}
}
break;
case OBJECT_MULTI_STATE_INPUT:
if (!Multistate_Input_Valid_Instance(instance)) {
r = Multistate_Input_Create(instance);
if (r == instance) {
Multistate_Input_Name_Set(instance, strdup(object_name));
}
}
break;
case OBJECT_MULTI_STATE_OUTPUT:
if (!Multistate_Output_Valid_Instance(instance)) {
r = Multistate_Output_Create(instance);
if (r == instance) {
Multistate_Output_Name_Set(instance, strdup(object_name));
}
}
break;
case OBJECT_MULTI_STATE_VALUE:
if (!Multistate_Value_Valid_Instance(instance)) {
r = Multistate_Value_Create(instance);
if (r == instance) {
Multistate_Value_Name_Set(instance, strdup(object_name));
}
}
break;
default:
break;
}
}
/**
* @brief Write a property to a BACnet object
* @param object_type Object type
* @param instance Object instance
* @param property_id Property ID
* @param value Property value
*/
static void bacnet_write_property(
uint16_t object_type,
uint32_t instance,
uint32_t property_id,
UBASIC_VARIABLE_TYPE value)
{
BACNET_BINARY_PV value_binary = BINARY_INACTIVE;
switch (object_type) {
case OBJECT_ANALOG_INPUT:
if (property_id == PROP_PRESENT_VALUE) {
Analog_Input_Present_Value_Set(
instance, fixedpt_tofloat(value));
}
break;
case OBJECT_ANALOG_OUTPUT:
if (property_id == PROP_PRESENT_VALUE) {
Analog_Output_Present_Value_Set(
instance, fixedpt_tofloat(value), BACNET_MAX_PRIORITY);
}
break;
case OBJECT_ANALOG_VALUE:
if (property_id == PROP_PRESENT_VALUE) {
Analog_Value_Present_Value_Set(
instance, fixedpt_tofloat(value), BACNET_MAX_PRIORITY);
}
break;
case OBJECT_BINARY_INPUT:
if (property_id == PROP_PRESENT_VALUE) {
if (fixedpt_toint(value) != 0) {
value_binary = BINARY_ACTIVE;
}
Binary_Input_Present_Value_Set(instance, value_binary);
}
break;
case OBJECT_BINARY_OUTPUT:
if (property_id == PROP_PRESENT_VALUE) {
if (fixedpt_toint(value) != 0) {
value_binary = BINARY_ACTIVE;
}
Binary_Output_Present_Value_Set(
instance, value_binary, BACNET_MAX_PRIORITY);
}
break;
case OBJECT_BINARY_VALUE:
if (property_id == PROP_PRESENT_VALUE) {
if (fixedpt_toint(value) != 0) {
value_binary = BINARY_ACTIVE;
}
Binary_Value_Present_Value_Set(instance, value_binary);
}
break;
case OBJECT_MULTI_STATE_INPUT:
if (property_id == PROP_PRESENT_VALUE) {
Multistate_Input_Present_Value_Set(
instance, fixedpt_toint(value));
}
break;
case OBJECT_MULTI_STATE_OUTPUT:
if (property_id == PROP_PRESENT_VALUE) {
Multistate_Output_Present_Value_Set(
instance, fixedpt_toint(value), BACNET_MAX_PRIORITY);
}
break;
case OBJECT_MULTI_STATE_VALUE:
if (property_id == PROP_PRESENT_VALUE) {
Multistate_Value_Present_Value_Set(
instance, fixedpt_toint(value));
}
break;
default:
break;
}
}
/**
* @brief Read a property from a BACnet object
* @param object_type Object type
* @param instance Object instance
* @param property_id Property ID
* @return Property value
*/
static UBASIC_VARIABLE_TYPE bacnet_read_property(
uint16_t object_type, uint32_t instance, uint32_t property_id)
{
UBASIC_VARIABLE_TYPE value = 0;
float value_float = 0.0;
BACNET_BINARY_PV value_binary = BINARY_INACTIVE;
switch (object_type) {
case OBJECT_ANALOG_INPUT:
if (property_id == PROP_PRESENT_VALUE) {
value_float = Analog_Input_Present_Value(instance);
value = fixedpt_fromfloat(value_float);
}
break;
case OBJECT_ANALOG_OUTPUT:
if (property_id == PROP_PRESENT_VALUE) {
value_float = Analog_Output_Present_Value(instance);
value = fixedpt_fromfloat(value_float);
}
break;
case OBJECT_ANALOG_VALUE:
if (property_id == PROP_PRESENT_VALUE) {
value_float = Analog_Value_Present_Value(instance);
value = fixedpt_fromfloat(value_float);
}
break;
case OBJECT_BINARY_INPUT:
if (property_id == PROP_PRESENT_VALUE) {
value_binary = Binary_Input_Present_Value(instance);
value =
fixedpt_fromint((value_binary == BINARY_ACTIVE) ? 1 : 0);
}
break;
case OBJECT_BINARY_OUTPUT:
if (property_id == PROP_PRESENT_VALUE) {
value_binary = Binary_Output_Present_Value(instance);
value =
fixedpt_fromint((value_binary == BINARY_ACTIVE) ? 1 : 0);
}
break;
case OBJECT_BINARY_VALUE:
if (property_id == PROP_PRESENT_VALUE) {
value_binary = Binary_Value_Present_Value(instance);
value =
fixedpt_fromint((value_binary == BINARY_ACTIVE) ? 1 : 0);
}
break;
case OBJECT_MULTI_STATE_INPUT:
if (property_id == PROP_PRESENT_VALUE) {
value =
fixedpt_fromint(Multistate_Input_Present_Value(instance));
}
break;
case OBJECT_MULTI_STATE_OUTPUT:
if (property_id == PROP_PRESENT_VALUE) {
value =
fixedpt_fromint(Multistate_Output_Present_Value(instance));
}
break;
case OBJECT_MULTI_STATE_VALUE:
if (property_id == PROP_PRESENT_VALUE) {
value =
fixedpt_fromint(Multistate_Value_Present_Value(instance));
}
break;
default:
break;
}
return value;
}
#endif
/**
* @brief Initialize the hardware drivers
* @param data Pointer to the ubasic data structure
*/
void ubasic_port_init(struct ubasic_data *data)
{
#if ( \
defined(UBASIC_SCRIPT_HAVE_TICTOC_CHANNELS) || \
defined(UBASIC_SCRIPT_HAVE_SLEEP) || \
defined(UBASIC_SCRIPT_HAVE_INPUT_FROM_SERIAL))
data->mstimer_now = mstimer_now;
#endif
data->variable_write = variable_write;
data->variable_read = variable_read;
#if defined(UBASIC_SCRIPT_HAVE_HARDWARE_EVENTS)
data->hw_event = hw_event;
data->hw_event_clear = hw_event_clear;
#endif
#if defined(UBASIC_SCRIPT_HAVE_PWM_CHANNELS)
data->pwm_config = pwm_config;
data->pwm_write = pwm_write;
data->pwm_read = pwm_read;
#endif
#if defined(UBASIC_SCRIPT_HAVE_PWM_CHANNELS)
data->adc_config = adc_config;
data->adc_read = adc_read;
#endif
#if defined(UBASIC_SCRIPT_HAVE_GPIO_CHANNELS)
data->gpio_config = gpio_config;
data->gpio_write = gpio_write;
data->gpio_read = gpio_read;
#endif
#if defined(UBASIC_SCRIPT_HAVE_RANDOM_NUMBER_GENERATOR)
data->random_uint32 = random_uint32;
#endif
#if defined(UBASIC_SCRIPT_HAVE_PRINT_TO_SERIAL)
data->serial_write = serial_write;
#endif
#if defined(UBASIC_SCRIPT_HAVE_INPUT_FROM_SERIAL)
data->ubasic_getc = serial_getc;
#endif
#if defined(UBASIC_SCRIPT_HAVE_BACNET)
data->bacnet_create_object = bacnet_create_object;
data->bacnet_write_property = bacnet_write_property;
data->bacnet_read_property = bacnet_read_property;
#endif
}
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