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create function to convert ints back into ULINEAR16

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macphyter 2024-01-22 00:05:20 -07:00 committed by Georges Palauqui
parent c1b031ab36
commit da126941d8
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GPG Key ID: 1E45F544CE4D04A5
2 changed files with 138 additions and 7 deletions
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141
main/TPS546.c
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@ -44,6 +44,26 @@ esp_err_t smb_read_byte(uint8_t command, uint8_t *data)
return err;
}
/**
* @brief SMBus write byte
*/
esp_err_t smb_write_byte(uint8_t command, uint8_t data)
{
esp_err_t err = ESP_FAIL;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, TPS546_I2CADDR << 1 | WRITE_BIT, ACK_CHECK);
i2c_master_write_byte(cmd, command, ACK_CHECK);
i2c_master_write_byte(cmd, data, ACK_CHECK);
i2c_master_stop(cmd);
ESP_ERROR_CHECK(i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, SMBUS_DEFAULT_TIMEOUT));
i2c_cmd_link_delete(cmd);
// TODO get an actual error status
return err;
}
/**
* @brief SMBus read word
*/
@ -69,6 +89,27 @@ esp_err_t smb_read_word(uint8_t command, uint16_t *result)
return err;
}
/**
* @brief SMBus write word
*/
esp_err_t smb_write_word(uint8_t command, uint16_t data)
{
esp_err_t err = ESP_FAIL;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, TPS546_I2CADDR << 1 | WRITE_BIT, ACK_CHECK);
i2c_master_write_byte(cmd, command, ACK_CHECK);
i2c_master_write_byte(cmd, (uint8_t)(data & 0x00FF), ACK_CHECK);
i2c_master_write_byte(cmd, (uint8_t)((data & 0xFF00) >> 8), NACK_VALUE);
i2c_master_stop(cmd);
ESP_ERROR_CHECK(i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, SMBUS_DEFAULT_TIMEOUT));
i2c_cmd_link_delete(cmd);
// TODO get an actual error status
return err;
}
/**
* @brief SMBus read block
*/
@ -99,15 +140,67 @@ static esp_err_t smb_read_block(uint8_t command, uint8_t * data, uint8_t len)
return 0;
}
/**
* @brief Convert an SLINEAR11 value into a float
*/
float slinear11_2_float(uint16_t value)
{
int exponent, mantissa;
float result;
// First 5 bits is exponent in twos-complement
// check the first bit of the exponent to see if its negative
if (value & 0x8000) {
// exponent is negative
exponent = -1 * (((~value >> 11) & 0x001F) + 1);
} else {
exponent = (value >> 11);
}
// last 11 bits is the mantissa in twos-complement
// check the first bit of the mantissa to see if its negative
if (value & 0x400) {
// mantissa is negative
mantissa = -1 * ((~value & 0x07FF) + 1);
} else {
mantissa = (value & 0x07FF);
}
// calculate result (mantissa * 2^exponent)
result = mantissa * powf(2.0, exponent);
return result;
}
/**
* @brief Convert a ULINEAR16 value into an int
*/
int ulinear16_2_int(uint16_t value)
{
float exponent;
int result;
uint8_t voutmode;
/* the exponent comes from VOUT_MODE bits[4..0] */
/* in twos-complement */
smb_read_byte(PMBUS_VOUT_MODE, &voutmode);
if (voutmode & 0x10) {
// exponent is negative
exponent = -1 * ((~voutmode & 0x1F) + 1);
} else {
exponent = (voutmode & 0x1F);
}
result = (value * powf(2.0, exponent)) * 1000;
return result;
}
// Set up the TPS546 regulator and turn it on
void TPS546_init(void)
{
uint8_t data[6];
uint8_t u8_value;
uint16_t u16_value;
float temp;
int mantissa, exponent;
int millivolts;
int vmax;
float iout;
ESP_LOGI(TAG, "Initializing the core voltage regulator");
@ -121,17 +214,35 @@ void TPS546_init(void)
/* Get temperature (SLINEAR11) */
ESP_LOGI(TAG, "--------------------------------");
smb_read_word(PMBUS_READ_TEMPERATURE_1, &u16_value);
temp = slinear11_2_float(u16_value);
ESP_LOGI(TAG, "Temp: %2.1f", temp);
ESP_LOGI(TAG, "Temp: %d", TPS546_get_temperature());
/* Get voltage setting (ULINEAR16) */
ESP_LOGI(TAG, "--------------------------------");
smb_read_word(PMBUS_VOUT_COMMAND, &u16_value);
ESP_LOGI(TAG, "VOUT_COMMAND: %04x", u16_value);
millivolts = ulinear16_2_int(u16_value);
ESP_LOGI(TAG, "Vout set to: %d mV", millivolts);
u16_value = int_2_ulinear16(millivolts);
ESP_LOGI(TAG, "Converted back: %04x", u16_value);
ESP_LOGI(TAG, "--------------------------------");
smb_read_word(PMBUS_VOUT_MAX, &u16_value);
ESP_LOGI(TAG, "VOUT_MAX: %04x", u16_value);
vmax = ulinear16_2_int(u16_value);
ESP_LOGI(TAG, "Vout Max set to: %d mV", vmax);
u16_value = int_2_ulinear16(1300);
smb_write_word(PMBUS_VOUT_MAX, u16_value);
ESP_LOGI(TAG, "Vout Max changed to 1300");
smb_read_word(PMBUS_VOUT_MAX, &u16_value);
ESP_LOGI(TAG, "VOUT_MAX: %04x", u16_value);
vmax = ulinear16_2_int(u16_value);
ESP_LOGI(TAG, "Vout Max set to: %d mV", vmax);
/* Get voltage output (ULINEAR16) */
// This gets a timeout, don't know why. clock stretching?
// ESP_LOGI(TAG, "--------------------------------");
// smb_read_word(PMBUS_READ_VOUT, &u16_value);
// millivolts = ulinear16_2_int(u16_value);
@ -145,4 +256,24 @@ void TPS546_init(void)
}
int TPS546_get_temperature(void)
{
uint16_t value;
float temp;
smb_read_word(PMBUS_READ_TEMPERATURE_1, &value);
temp = slinear11_2_float(value);
return (int)temp;
}
void TPS546_set_vout(int millivolts)
{
uint16_t value;
value = int_2_ulinear16(millivolts);
smb_write_word(PMBUS_VOUT_COMMAND, value);
ESP_LOGI(TAG, "Vout changed to %d mV", millivolts);
}

4
main/TPS546.h
View File

@ -7,7 +7,7 @@
void TPS546_init(void);
//void TPS546_set_voltage(float);
//void TPS546_get_status(void);
int TPS546_get_temperature(void);
void TPS546_set_vout(int millivolts);
#endif /* TPS546_H_ */