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gxht30

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Mira
2025-11-10 12:34:10 +06:00
parent e448282aed
commit 80478c7400
3 changed files with 369 additions and 1 deletions
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3
.vscode/settings.json vendored
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@@ -41,6 +41,7 @@
"string": "c",
"atomic": "c",
"__bit_reference": "c",
"err.h": "c"
"err.h": "c",
"httpd.h": "c"
}
}

295
inc/gxht30_hw_i2c.h Normal file
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@@ -0,0 +1,295 @@
#ifndef _GXHT30_CH32_HW_I2C_H
#define _GXHT30_CH32_HW_I2C_H
#include <stdbool.h>
#include <stdint.h>
#include "ch32fun.h"
#include "ch32v20xhw.h"
// I2C Configuration
#define GXHT30_I2C_CLKRATE 400000
#define GXHT30_I2C_PRERATE 2000000
#define GXHT30_I2C_TIMEOUT_MAX 250000
// GXHT30 I2C Addresses
#define GXHT30_I2C_ADDR_DEFAULT 0x44
#define GXHT30_I2C_ADDR_ALT 0x45
// Commands
#define GXHT30_CMD_MEAS_MSB 0x2C
#define GXHT30_CMD_MEAS_LSB 0x06
#define GXHT30_CMD_SOFT_RESET_MSB 0x30
#define GXHT30_CMD_SOFT_RESET_LSB 0xA2
#define GXHT30_CMD_HEATER_ON_MSB 0x30
#define GXHT30_CMD_HEATER_ON_LSB 0x6D
#define GXHT30_CMD_HEATER_OFF_MSB 0x30
#define GXHT30_CMD_HEATER_OFF_LSB 0x66
#define GXHT30_CMD_STATUS_MSB 0xF3
#define GXHT30_CMD_STATUS_LSB 0x2D
#define GXHT30_CMD_CLEAR_STATUS_MSB 0x30
#define GXHT30_CMD_CLEAR_STATUS_LSB 0x41
// I2C Event Masks
#define GXHT30_I2C_EVT_MASTER_MODE_SELECT \
((uint32_t)0x00030001) // BUSY, MSL, SB
#define GXHT30_I2C_EVT_MASTER_TRANSMITTER_MODE \
((uint32_t)0x00070082) // BUSY, MSL, ADDR, TXE, TRA
#define GXHT30_I2C_EVT_MASTER_RECEIVER_MODE \
((uint32_t)0x00030002) // BUSY, MSL, ADDR
#define GXHT30_I2C_EVT_MASTER_BYTE_TRANSMITTED \
((uint32_t)0x00070084) // TRA, BUSY, MSL, TXE, BTF
#define GXHT30_I2C_EVT_MASTER_BYTE_RECEIVED \
((uint32_t)0x00030040) // BUSY, MSL, RXNE
// Sensor Data Structure
typedef struct {
float temperature; // Temperature in Celsius
float humidity; // Relative humidity in %
uint8_t error; // Last error code
} GXHT30_Data;
// Status Register Structure
typedef struct {
uint8_t alert_pending; // Bit 15: Alert status
uint8_t heater_on; // Bit 13: Heater status
uint8_t humidity_alert; // Bit 11: Humidity tracking alert
uint8_t temperature_alert; // Bit 10: Temperature tracking alert
uint8_t reset_detected; // Bit 4: System reset detected
uint8_t command_status; // Bit 1: Last command execution status
uint8_t crc_status; // Bit 0: Write data CRC checksum status
uint16_t raw_status; // Raw 16-bit status value
} GXHT30_Status;
// Error Codes
enum GXHT30_Error {
GXHT30_OK = 0,
GXHT30_ERR_TIMEOUT,
GXHT30_ERR_CRC,
GXHT30_ERR_I2C,
GXHT30_ERR_BUSY
};
static inline uint8_t _gxht30_i2c_check_event(uint32_t event_mask) {
uint32_t status = I2C1->STAR1 | (I2C1->STAR2 << 16);
return (status & event_mask) == event_mask;
}
static inline uint8_t _gxht30_wait_event(uint32_t event_mask) {
int32_t timeout = GXHT30_I2C_TIMEOUT_MAX;
while (!_gxht30_i2c_check_event(event_mask) && (timeout-- > 0));
return timeout > 0 ? GXHT30_OK : GXHT30_ERR_TIMEOUT;
}
static inline uint8_t _gxht30_wait_flag(uint32_t flag) {
int32_t timeout = GXHT30_I2C_TIMEOUT_MAX;
while (!(I2C1->STAR1 & flag) && (timeout-- > 0));
return timeout > 0 ? GXHT30_OK : GXHT30_ERR_TIMEOUT;
}
static inline uint8_t _gxht30_i2c_start(uint8_t addr, uint8_t direction) {
// wait until bus is not busy
int32_t timeout = GXHT30_I2C_TIMEOUT_MAX;
while ((I2C1->STAR2 & I2C_STAR2_BUSY) && (timeout-- > 0));
if (timeout <= 0) return GXHT30_ERR_TIMEOUT;
// gen START
I2C1->CTLR1 |= I2C_CTLR1_START;
if (_gxht30_wait_event(GXHT30_I2C_EVT_MASTER_MODE_SELECT) != GXHT30_OK)
return GXHT30_ERR_TIMEOUT;
// send addr
I2C1->DATAR = (addr << 1) | direction;
uint32_t event = (direction == 0) ? GXHT30_I2C_EVT_MASTER_TRANSMITTER_MODE
: GXHT30_I2C_EVT_MASTER_RECEIVER_MODE;
return _gxht30_wait_event(event);
}
static inline uint8_t _gxht30_i2c_write_byte(uint8_t data) {
I2C1->DATAR = data;
return _gxht30_wait_flag(I2C_STAR1_TXE);
}
static inline uint8_t _gxht30_i2c_read(uint8_t* buffer, uint8_t length) {
for (uint8_t i = 0; i < length; i++) {
if (i == length - 1) {
I2C1->CTLR1 &= ~I2C_CTLR1_ACK; // NACK last byte
}
if (_gxht30_wait_flag(I2C_STAR1_RXNE) != GXHT30_OK) {
I2C1->CTLR1 |= I2C_CTLR1_ACK;
return GXHT30_ERR_TIMEOUT;
}
buffer[i] = I2C1->DATAR;
}
I2C1->CTLR1 |= I2C_CTLR1_ACK; // re-enable ACK
return GXHT30_OK;
}
static inline bool _gxht30_crc8_check(uint8_t msb, uint8_t lsb, uint8_t crc) {
uint8_t calc_crc = 0xFF;
uint8_t data[2] = {msb, lsb};
for (uint8_t byte = 0; byte < 2; byte++) {
calc_crc ^= data[byte];
for (uint8_t i = 0; i < 8; i++) {
calc_crc = (calc_crc & 0x80) ? (calc_crc << 1) ^ 0x31 : (calc_crc << 1);
}
}
return calc_crc == crc;
}
// init I2C hw
static inline void gxht30_i2c_init(void) {
uint16_t tempreg;
RCC->APB2PCENR |= RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO;
RCC->APB1PCENR |= RCC_APB1Periph_I2C1;
// PB6 (SCL) and PB7 (SDA)
GPIOB->CFGLR &= ~(0xff << (4 * 6));
GPIOB->CFGLR |= ((GPIO_Speed_10MHz | GPIO_CNF_OUT_OD_AF) << (4 * 6)) |
((GPIO_Speed_10MHz | GPIO_CNF_OUT_OD_AF) << (4 * 7));
// rst I2C1
RCC->APB1PRSTR |= RCC_APB1Periph_I2C1;
RCC->APB1PRSTR &= ~RCC_APB1Periph_I2C1;
// i2c frequency
tempreg = I2C1->CTLR2;
tempreg &= ~I2C_CTLR2_FREQ;
tempreg |= (FUNCONF_SYSTEM_CORE_CLOCK / GXHT30_I2C_PRERATE) & I2C_CTLR2_FREQ;
I2C1->CTLR2 = tempreg;
// Fast Mode 400kHz
tempreg =
(FUNCONF_SYSTEM_CORE_CLOCK / (3 * GXHT30_I2C_CLKRATE)) & I2C_CKCFGR_CCR;
tempreg |= I2C_CKCFGR_FS;
I2C1->CKCFGR = tempreg;
// en I2C and ACK
I2C1->CTLR1 |= I2C_CTLR1_PE | I2C_CTLR1_ACK;
}
static inline uint8_t gxht30_send_command(uint8_t addr, uint8_t cmd_msb,
uint8_t cmd_lsb) {
uint8_t err;
if ((err = _gxht30_i2c_start(addr, 0)) != GXHT30_OK) return err;
if ((err = _gxht30_i2c_write_byte(cmd_msb)) != GXHT30_OK) return err;
if ((err = _gxht30_i2c_write_byte(cmd_lsb)) != GXHT30_OK) return err;
if (_gxht30_wait_event(GXHT30_I2C_EVT_MASTER_BYTE_TRANSMITTED) != GXHT30_OK)
return GXHT30_ERR_TIMEOUT;
I2C1->CTLR1 |= I2C_CTLR1_STOP;
return GXHT30_OK;
}
// read temp and humidity
static inline uint8_t gxht30_read_data(uint8_t addr, GXHT30_Data* data) {
uint8_t rx_data[6];
uint8_t err;
if ((err = gxht30_send_command(addr, GXHT30_CMD_MEAS_MSB,
GXHT30_CMD_MEAS_LSB)) != GXHT30_OK) {
data->error = err;
return err;
}
// read data
if ((err = _gxht30_i2c_start(addr, 1)) != GXHT30_OK) {
data->error = err;
return err;
}
if ((err = _gxht30_i2c_read(rx_data, 6)) != GXHT30_OK) {
data->error = err;
return err;
}
I2C1->CTLR1 |= I2C_CTLR1_STOP;
// verify crc
if (!_gxht30_crc8_check(rx_data[0], rx_data[1], rx_data[2]) ||
!_gxht30_crc8_check(rx_data[3], rx_data[4], rx_data[5])) {
data->error = GXHT30_ERR_CRC;
return GXHT30_ERR_CRC;
}
// calc values
uint16_t temp_raw = (rx_data[0] << 8) | rx_data[1];
uint16_t hum_raw = (rx_data[3] << 8) | rx_data[4];
data->temperature = (float)temp_raw * 0.00267033f - 45.0f;
data->humidity = (float)hum_raw * 0.0015259f;
data->error = GXHT30_OK;
return GXHT30_OK;
}
static inline uint8_t gxht30_read_status(uint8_t addr, GXHT30_Status* status) {
uint8_t rx_data[3];
uint8_t err;
if ((err = _gxht30_i2c_start(addr, 0)) != GXHT30_OK) return err;
if ((err = _gxht30_i2c_write_byte(GXHT30_CMD_STATUS_MSB)) != GXHT30_OK)
return err;
if ((err = _gxht30_i2c_write_byte(GXHT30_CMD_STATUS_LSB)) != GXHT30_OK)
return err;
if (_gxht30_wait_event(GXHT30_I2C_EVT_MASTER_BYTE_TRANSMITTED) != GXHT30_OK)
return GXHT30_ERR_TIMEOUT;
I2C1->CTLR1 |= I2C_CTLR1_START;
if (_gxht30_wait_event(GXHT30_I2C_EVT_MASTER_MODE_SELECT) != GXHT30_OK)
return GXHT30_ERR_TIMEOUT;
I2C1->DATAR = (addr << 1) | 0x01;
if (_gxht30_wait_event(GXHT30_I2C_EVT_MASTER_RECEIVER_MODE) != GXHT30_OK)
return GXHT30_ERR_TIMEOUT;
if ((err = _gxht30_i2c_read(rx_data, 3)) != GXHT30_OK) return err;
I2C1->CTLR1 |= I2C_CTLR1_STOP;
if (!_gxht30_crc8_check(rx_data[0], rx_data[1], rx_data[2]))
return GXHT30_ERR_CRC;
uint16_t raw = (rx_data[0] << 8) | rx_data[1];
status->raw_status = raw;
status->alert_pending = (raw >> 15) & 0x01;
status->heater_on = (raw >> 13) & 0x01;
status->humidity_alert = (raw >> 11) & 0x01;
status->temperature_alert = (raw >> 10) & 0x01;
status->reset_detected = (raw >> 4) & 0x01;
status->command_status = (raw >> 1) & 0x01;
status->crc_status = raw & 0x01;
return GXHT30_OK;
}
static inline uint8_t gxht30_soft_reset(uint8_t addr) {
return gxht30_send_command(addr, GXHT30_CMD_SOFT_RESET_MSB,
GXHT30_CMD_SOFT_RESET_LSB);
}
static inline uint8_t gxht30_heater_on(uint8_t addr) {
return gxht30_send_command(addr, GXHT30_CMD_HEATER_ON_MSB,
GXHT30_CMD_HEATER_ON_LSB);
}
static inline uint8_t gxht30_heater_off(uint8_t addr) {
return gxht30_send_command(addr, GXHT30_CMD_HEATER_OFF_MSB,
GXHT30_CMD_HEATER_OFF_LSB);
}
static inline uint8_t gxht30_clear_status(uint8_t addr) {
return gxht30_send_command(addr, GXHT30_CMD_CLEAR_STATUS_MSB,
GXHT30_CMD_CLEAR_STATUS_LSB);
}
#endif // _GXHT30_CH32_HW_I2C_H

72
main.c
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@@ -3,6 +3,7 @@
#include "ch32fun.h"
#include "ch32v20xhw.h"
#include "ethernetif.h"
#include "gxht30_hw_i2c.h"
#include "lwip/apps/httpd.h"
#include "lwip/dhcp.h"
#include "lwip/init.h"
@@ -25,6 +26,8 @@
#define PLL_MULTIPLIER 15
#define STATS_PRINT_INTERVAL_MS 10000
#define SENSOR_READ_INTERVAL_MS 5000
#define STATUS_READ_INTERVAL_MS 30000
struct netif g_netif;
static volatile int g_httpd_is_initialized = 0;
@@ -178,10 +181,17 @@ void ethernetif_print_stats(void) {
int main() {
SystemInit();
set_sysclk_to_120mhz_from_hse();
print_clock_registers();
systick_init();
led_init();
lwip_stack_init();
gxht30_i2c_init();
gxht30_soft_reset(GXHT30_I2C_ADDR_DEFAULT);
Delay_Ms(10);
uint32_t last_led_toggle_time = 0;
uint32_t last_link_poll_time = 0;
#if LWIP_STATS
@@ -189,6 +199,14 @@ int main() {
#endif
int led_state = 0;
uint32_t last_sensor_read_time = 0;
uint32_t last_status_read_time = 0;
GXHT30_Data sensor_data = {0};
GXHT30_Status sensor_status = {0};
printf("GXHT30 Sensor initialized\n");
while (1) {
ethernetif_input(&g_netif);
sys_check_timeouts();
@@ -205,6 +223,60 @@ int main() {
}
#endif
// Read sensor data periodically
if (millis() - last_sensor_read_time > SENSOR_READ_INTERVAL_MS) {
if (gxht30_read_data(GXHT30_I2C_ADDR_DEFAULT, &sensor_data) ==
GXHT30_OK) {
int16_t temp_int = (int16_t)(sensor_data.temperature * 100);
int16_t hum_int = (int16_t)(sensor_data.humidity * 100);
int16_t temp_whole = temp_int / 100;
int16_t temp_decimal = temp_int % 100;
if (temp_decimal < 0) temp_decimal = -temp_decimal;
int16_t hum_whole = hum_int / 100;
int16_t hum_decimal = hum_int % 100;
printf("Temperature: %d.%02d C | Humidity: %d.%02d %%\n", temp_whole,
temp_decimal, hum_whole, hum_decimal);
} else {
printf("Sensor error: %d\n", sensor_data.error);
}
last_sensor_read_time = millis();
}
// Read status register periodically
if (millis() - last_status_read_time > STATUS_READ_INTERVAL_MS) {
if (gxht30_read_status(GXHT30_I2C_ADDR_DEFAULT, &sensor_status) ==
GXHT30_OK) {
printf("Status: ");
if (sensor_status.alert_pending) printf("ALERT ");
if (sensor_status.heater_on) printf("HEATER_ON ");
if (sensor_status.humidity_alert) printf("HUM_ALERT ");
if (sensor_status.temperature_alert) printf("TEMP_ALERT ");
if (sensor_status.reset_detected) printf("RESET ");
if (sensor_status.command_status) printf("CMD_ERR ");
if (sensor_status.crc_status) printf("CRC_ERR ");
if (sensor_status.raw_status == 0x0010) {
printf("OK (reset detected on startup)");
} else if (sensor_status.raw_status == 0x0000) {
printf("OK");
}
printf("\n");
// Clear reset flag after first read if you want
// if (sensor_status.reset_detected) {
// gxht30_clear_status(GXHT30_I2C_ADDR_DEFAULT);
// }
} else {
printf("Status read error\n");
}
last_status_read_time = millis();
}
// uint32_t now = millis();
// if (now - last_led_toggle_time > LED_TOGGLE_INTERVAL_MS) {
// if (led_state) {