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add mqtt, decouple i2c and sensor

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Mira
2025-11-10 22:40:21 +06:00
parent 80478c7400
commit fe6cc2ebb9
8 changed files with 466 additions and 231 deletions
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218
inc/gxht30_hw_i2c.h
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@@ -1,22 +1,16 @@
#ifndef _GXHT30_CH32_HW_I2C_H
#define _GXHT30_CH32_HW_I2C_H
#ifndef _GXHT30_HW_I2C_H
#define _GXHT30_HW_I2C_H
#include <stdbool.h>
#include <stdint.h>
#include "ch32fun.h"
#include "ch32v20xhw.h"
#include "hw_i2c.h"
// I2C Configuration
#define GXHT30_I2C_CLKRATE 400000
#define GXHT30_I2C_PRERATE 2000000
#define GXHT30_I2C_TIMEOUT_MAX 250000
// GXHT30 I2C Addresses
// GXHT30 I2C addresses
#define GXHT30_I2C_ADDR_DEFAULT 0x44
#define GXHT30_I2C_ADDR_ALT 0x45
// Commands
// GXHT30 cmds
#define GXHT30_CMD_MEAS_MSB 0x2C
#define GXHT30_CMD_MEAS_LSB 0x06
#define GXHT30_CMD_SOFT_RESET_MSB 0x30
@@ -30,26 +24,18 @@
#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
// conversion constants
#define GXHT30_TEMP_MULTIPLIER 2670
#define GXHT30_TEMP_OFFSET 45000000L
#define GXHT30_HUM_MULTIPLIER 1526
#define GXHT30_SCALE_DIVISOR 10000
// Sensor Data Structure
typedef struct {
float temperature; // Temperature in Celsius
float humidity; // Relative humidity in %
uint8_t error; // Last error code
int32_t temperature_x100; // Temperature in hundredths of a degree C
int32_t humidity_x100; // Humidity in hundredths of a percent RH
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
@@ -61,76 +47,14 @@ typedef struct {
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
GXHT30_ERR_I2C
};
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) {
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};
@@ -144,121 +68,61 @@ static inline bool _gxht30_crc8_check(uint8_t msb, uint8_t lsb, uint8_t crc) {
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;
uint8_t cmd[2] = {cmd_msb, cmd_lsb};
uint8_t err = i2c_write(addr, cmd, 2);
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;
return (err == I2C_OK) ? GXHT30_OK : GXHT30_ERR_I2C;
}
// read temp and humidity
static inline uint8_t gxht30_read_data(uint8_t addr, GXHT30_Data* data) {
uint8_t cmd[2] = {GXHT30_CMD_MEAS_MSB, GXHT30_CMD_MEAS_LSB};
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;
// send measurement command and read
if ((err = i2c_write_read(addr, cmd, 2, rx_data, 6)) != I2C_OK) {
data->error = GXHT30_ERR_I2C;
return GXHT30_ERR_I2C;
}
// 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])) {
// verify CRC for both temp and humidity
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
// calc the 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->temperature_x100 =
(((int64_t)temp_raw * GXHT30_TEMP_MULTIPLIER) - GXHT30_TEMP_OFFSET) /
GXHT30_SCALE_DIVISOR;
data->humidity_x100 =
((int64_t)hum_raw * GXHT30_HUM_MULTIPLIER) / GXHT30_SCALE_DIVISOR;
data->error = GXHT30_OK;
return GXHT30_OK;
}
static inline uint8_t gxht30_read_status(uint8_t addr, GXHT30_Status* status) {
uint8_t cmd[2] = {GXHT30_CMD_STATUS_MSB, GXHT30_CMD_STATUS_LSB};
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;
if ((err = i2c_write_read(addr, cmd, 2, rx_data, 3)) != I2C_OK) {
return GXHT30_ERR_I2C;
}
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]))
// verify CRC
if (!gxht30_crc8_check(rx_data[0], rx_data[1], rx_data[2])) {
return GXHT30_ERR_CRC;
}
// parse status register
uint16_t raw = (rx_data[0] << 8) | rx_data[1];
status->raw_status = raw;
status->alert_pending = (raw >> 15) & 0x01;
@@ -292,4 +156,4 @@ static inline uint8_t gxht30_clear_status(uint8_t addr) {
GXHT30_CMD_CLEAR_STATUS_LSB);
}
#endif // _GXHT30_CH32_HW_I2C_H
#endif // _GXHT30_HW_I2C_H