mirror of
https://github.com/skot/ESP-Miner.git
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94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
#include <stdio.h>
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#include "esp_log.h"
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#include "driver/i2c.h"
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#include "EMC2101.h"
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#define I2C_MASTER_SCL_IO 48 /*!< GPIO number used for I2C master clock */
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#define I2C_MASTER_SDA_IO 47 /*!< GPIO number used for I2C master data */
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#define I2C_MASTER_NUM 0 /*!< I2C master i2c port number, the number of i2c peripheral interfaces available will depend on the chip */
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#define I2C_MASTER_FREQ_HZ 400000 /*!< I2C master clock frequency */
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#define I2C_MASTER_TX_BUF_DISABLE 0 /*!< I2C master doesn't need buffer */
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#define I2C_MASTER_RX_BUF_DISABLE 0 /*!< I2C master doesn't need buffer */
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#define I2C_MASTER_TIMEOUT_MS 1000
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// static const char *TAG = "EMC2101.c";
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/**
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* @brief Read a sequence of I2C bytes
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*/
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static esp_err_t register_read(uint8_t reg_addr, uint8_t *data, size_t len)
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{
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return i2c_master_write_read_device(I2C_MASTER_NUM, EMC2101_I2CADDR_DEFAULT, ®_addr, 1, data, len, I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);
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}
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/**
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* @brief Write a byte to a I2C register
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*/
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static esp_err_t register_write_byte(uint8_t reg_addr, uint8_t data)
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{
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int ret;
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uint8_t write_buf[2] = {reg_addr, data};
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ret = i2c_master_write_to_device(I2C_MASTER_NUM, EMC2101_I2CADDR_DEFAULT, write_buf, sizeof(write_buf), I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);
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return ret;
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}
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// run this first. sets up the config register
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void EMC2101_init(void)
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{
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// set the TACH input
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ESP_ERROR_CHECK(register_write_byte(EMC2101_REG_CONFIG, 0x04));
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}
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// takes a fan speed percent
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void EMC2101_set_fan_speed(float percent)
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{
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uint8_t speed;
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speed = (uint8_t)(63.0 * percent);
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ESP_ERROR_CHECK(register_write_byte(EMC2101_REG_FAN_SETTING, speed));
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}
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// RPM = 5400000/reading
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uint16_t EMC2101_get_fan_speed(void)
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{
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uint8_t tach_lsb, tach_msb;
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uint16_t reading;
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uint16_t RPM;
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ESP_ERROR_CHECK(register_read(EMC2101_TACH_LSB, &tach_lsb, 1));
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ESP_ERROR_CHECK(register_read(EMC2101_TACH_MSB, &tach_msb, 1));
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// ESP_LOGI(TAG, "Raw Fan Speed = %02X %02X", tach_msb, tach_lsb);
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reading = tach_lsb | (tach_msb << 8);
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RPM = 5400000 / reading;
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// ESP_LOGI(TAG, "Fan Speed = %d RPM", RPM);
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return RPM;
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}
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float EMC2101_get_external_temp(void)
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{
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uint8_t temp_msb, temp_lsb;
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uint16_t reading;
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ESP_ERROR_CHECK(register_read(EMC2101_EXTERNAL_TEMP_MSB, &temp_msb, 1));
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ESP_ERROR_CHECK(register_read(EMC2101_EXTERNAL_TEMP_LSB, &temp_lsb, 1));
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reading = temp_lsb | (temp_msb << 8);
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reading >>= 5;
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return (float)reading / 8.0;
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}
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uint8_t EMC2101_get_internal_temp(void)
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{
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uint8_t temp;
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ESP_ERROR_CHECK(register_read(EMC2101_INTERNAL_TEMP, &temp, 1));
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return temp;
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}
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