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Added T, RH readout

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This commit is contained in:
Duke NUCem 2021-09-09 18:11:11 +02:00
parent 7b0ad1fd65
commit 0837de9703
3 changed files with 50 additions and 36 deletions
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2
fw/Core/Inc/modbus.h
View File

@ -133,6 +133,8 @@ typedef struct {
uint16_t buffer16b[MODBUS_MAX_RTU_FRAME_SIZE/2];
uint16_t input_registers[MODBUS_MAX_REGISTERS];
uint16_t holding_registers[MODBUS_MAX_REGISTERS];
int16_t input_registers_signed[MODBUS_MAX_REGISTERS];
int16_t holding_registers_signed[MODBUS_MAX_REGISTERS];
};
} modbus_transaction_t;

75
fw/Core/Src/main.c
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@ -51,7 +51,7 @@ const uint16_t tim21_prescaler = 60000-1; // 100Hz
const uint16_t tim21_period = 1200-1; // 6s
//const uint16_t tim21_period = 200-1; // 1s
/* Input register memory map (just a suggestion, not implemented yet)
/* Input register memory map
* (All registers are 16-bit)
* -------------------------
*
@ -63,40 +63,21 @@ const uint16_t tim21_period = 1200-1; // 6s
* 30013 : T [deg_C * 10] From SCD4x; unsigned value in range [0; 600]; e.g. 21.5 C => 215
* 30014 : RH [%] From SCD4x; unsigned value in range [0; 100]
*
* Extended temperature range:
* Extended temperature range (signed values):
* 30015 : T [deg_C * 10] From SHT4x; signed value (two's complement) in range [-400;1250]
* 30016 : T [deg_C * 10] From SCD4x; signed value (two's complement) in range [-100;600]; e.g. -12.3 C => -123
*
*
* Notes:
*
* - je potreba uzivateli zpristupnit T a RH z SCD4x? Pripadne je tam nechat, ale pouze jako zalozni?
* - jaky pouzit format pro signed hodnoty? Two's complement (int16_t)? Nebo jich tam dat vic (one's complement)?
* - omezit rozsah? Pro mereni T v interieru nema smysl +125 deg C (na to uz jsou pozarni cidla, haha)
* - pocatecni cislo registru (30010) jsem si vymyslel. Muzeme pouzit jine, treba primo zacatek input registru (30001)
*
*/
/* Input registers memory map implementation */
union {
struct {
uint16_t CO2; // 30010
uint16_t T_SHT4x; // 30011
uint16_t RH_SHT4x; // 30012
uint16_t T_SCD4x; // 30013
uint16_t RH_SCD4x; // 30014
int16_t T_SHT4x_signed; // 30015
int16_t T_SCD4x_signed; // 30016
};
struct {
uint16_t main_values[3]; // CO2, T_SHT4x, RH_SHT4x
uint16_t backup_values[2]; // T_SCD4x, RH_SCD4x
int16_t extended_range_values[2]; // T_SHT4x_signed, T_SCD4x_signed
};
struct {
uint16_t unsigned_values[5];
int16_t signed_values[2];
};
} measured_values;
enum {
REGISTER_NUM_CO2 = 30010,
REGISTER_NUM_T_SHT4x = 30011,
REGISTER_NUM_RH_SHT4x = 30012,
REGISTER_NUM_T_SCD4x = 30013,
REGISTER_NUM_RH_SCD4x = 30014,
REGISTER_NUM_T_SHT4x_SIGNED = 30015,
REGISTER_NUM_T_SCD4x_SIGNED = 30016
} register_numbers;
/* Variables to store the measured data */
int CO2, T_SCD4x, RH_SCD4x;
@ -118,14 +99,38 @@ void LPUART1_TX_Buffer(uint8_t* buffer_tx, uint8_t buffer_tx_len);
/* USER CODE BEGIN 0 */
int8_t modbus_slave_callback(modbus_transaction_t *transaction)
{
uint16_t register_number = transaction->register_number;
if (transaction->function_code == MODBUS_READ_INPUT_REGISTERS) {
// TODO select reasonable register numbers and implement
// readout of all measured variables
if (transaction->register_number == 30010) { // register number 30010 (randomly selected)
transaction->input_registers[0] = CO2;
for (int i = 0; i < transaction->register_count; i++, register_number++) {
switch (register_number) {
case REGISTER_NUM_CO2:
transaction->input_registers[i] = (uint16_t)CO2;
break;
case REGISTER_NUM_T_SHT4x:
transaction->input_registers[i] = (uint16_t)T_SHT4x;
break;
case REGISTER_NUM_RH_SHT4x:
transaction->input_registers[i] = (uint16_t)RH_SHT4x;
break;
case REGISTER_NUM_T_SCD4x:
transaction->input_registers[i] = (uint16_t)T_SCD4x;
break;
case REGISTER_NUM_RH_SCD4x:
transaction->input_registers[i] = (uint16_t)RH_SCD4x;
break;
case REGISTER_NUM_T_SHT4x_SIGNED:
transaction->input_registers_signed[i] = (int16_t)T_SHT4x;
break;
case REGISTER_NUM_T_SCD4x_SIGNED:
transaction->input_registers_signed[i] = (int16_t)T_SCD4x;
break;
default:
return MODBUS_ERROR_FUNCTION_NOT_IMPLEMENTED;
}
}
return MODBUS_OK;
}
}
/* Catch-all error */
return MODBUS_ERROR_FUNCTION_NOT_IMPLEMENTED; /* nothing implemented yet! TODO */
}

9
tests/minimalmodbus_test.py
View File

@ -1,4 +1,5 @@
#!/usr/bin/env python3
from time import sleep
import minimalmodbus
import serial
@ -14,5 +15,11 @@ instrument.mode = minimalmodbus.MODE_RTU # rtu or ascii mode
instrument.clear_buffers_before_each_transaction = True
# read
T = 0
RH = T
CO2 = instrument.read_register(9, 1, functioncode=4) * 10
print(CO2)
sleep(0.1)
T = instrument.read_register(10, 1, functioncode=4)
sleep(0.1)
RH = instrument.read_register(11, 1, functioncode=4) * 10
print(f'CO2: {CO2} ppm\t\tT: {T} deg C\t\tRH: {RH} %')