foxBMS - Unit Tests  1.2.0
The foxBMS Unit Tests API Documentation
n775_cfg.h File Reference

Header for the configuration for the MC33775A monitoring chip. More...

#include "battery_system_cfg.h"
#include "n775_defs.h"
#include "nxp_afe_dma.h"
#include "spi.h"
Include dependency graph for n775_cfg.h:
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Go to the source code of this file.

Macros

#define N775_N_N775   (BS_NR_OF_MODULES)
 
#define N775_NUMBER_OF_N775_PER_MODULE   (1u)
 
#define N775_TX_MESSAGE_LENGTH   (7u)
 
#define N775_RX_MESSAGE_LENGTH   (4u)
 
#define N775_MAX_NUMBER_OF_VOLTAGES   (14u)
 
#define N775_TRANSMISSION_TIMEOUT   (10u)
 
#define N775_STATEMACH_SHORTTIME   (1u)
 
#define N775_TWAKECOM_MS   (3u)
 
#define N775_TDWAKE_MS   (4u)
 
#define N775_TIME_DAISYCHAIN_WAKEUP_MS   (N775_N_N775 * (N775_TWAKECOM_MS + N775_TDWAKE_MS))
 
#define N775_TIME_BETWEEN_WAKEUP_MS   (4u)
 
#define N775_TIME_AFTER_ENUMERATION_MS   (1u)
 
#define N775_TRANSMIT_SPIERRLIMIT   (3u)
 
#define N775_MAX_N_BYTES_FOR_DATA_RECEPTION   (N775_TX_MESSAGE_LENGTH * N775_MAX_NUMBER_OF_VOLTAGES)
 
#define N775_SendData(txbuf, rxbuf, length)   SPI_TransmitReceiveDataDma(&spi_nxp775Interface, txbuf, rxbuf, length)
 
#define N775_SPI_HANDLE   &spi_devices[0]
 
#define N775_SPI_INSTANCE   *N775_SPI_HANDLE.Instance
 
#define N775_SPI_PRESCALER   *N775_SPI_HANDLE.Init.BaudRatePrescaler
 

Functions

float N775_Convert_MuxVoltages_to_Temperatures (float v_adc_V)
 converts a raw voltage from multiplexer to a temperature value in Celsius. More...
 

Variables

const uint8_t n775_voltage_input_used [BS_MAX_SUPPORTED_CELLS]
 

Detailed Description

Header for the configuration for the MC33775A monitoring chip.

SPDX-License-Identifier: BSD-3-Clause

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Author
foxBMS Team
Date
2020-05-08 (date of creation)
Updated
2021-03-24 (date of last update)
Prefix
N775

Definition in file n775_cfg.h.

Macro Definition Documentation

◆ N775_MAX_N_BYTES_FOR_DATA_RECEPTION

#define N775_MAX_N_BYTES_FOR_DATA_RECEPTION   (N775_TX_MESSAGE_LENGTH * N775_MAX_NUMBER_OF_VOLTAGES)

Max number of Bytes to be received from daisy-chain This limit is not due to the hardware. It is only to set the length of the receive buffer for DMA.

Definition at line 151 of file n775_cfg.h.

◆ N775_MAX_NUMBER_OF_VOLTAGES

#define N775_MAX_NUMBER_OF_VOLTAGES   (14u)

775A maximum number of cell voltages that can be measured.

Definition at line 89 of file n775_cfg.h.

◆ N775_N_N775

#define N775_N_N775   (BS_NR_OF_MODULES)

Number of used N775-ICs

Definition at line 69 of file n775_cfg.h.

◆ N775_NUMBER_OF_N775_PER_MODULE

#define N775_NUMBER_OF_N775_PER_MODULE   (1u)

Number of N775-ICs per battery module

Definition at line 74 of file n775_cfg.h.

◆ N775_RX_MESSAGE_LENGTH

#define N775_RX_MESSAGE_LENGTH   (4u)

775A Rx message length in bytes.

Definition at line 84 of file n775_cfg.h.

◆ N775_SendData

#define N775_SendData (   txbuf,
  rxbuf,
  length 
)    SPI_TransmitReceiveDataDma(&spi_nxp775Interface, txbuf, rxbuf, length)

Transmit functions

Definition at line 156 of file n775_cfg.h.

◆ N775_SPI_HANDLE

#define N775_SPI_HANDLE   &spi_devices[0]

SPI1 is used for communication with N775

Definition at line 101 of file n775_cfg.h.

◆ N775_SPI_INSTANCE

#define N775_SPI_INSTANCE   *N775_SPI_HANDLE.Instance

SPI1 is used for communication with N775

Definition at line 103 of file n775_cfg.h.

◆ N775_SPI_PRESCALER

#define N775_SPI_PRESCALER   *N775_SPI_HANDLE.Init.BaudRatePrescaler

SPI1 is used for communication with N775

Definition at line 105 of file n775_cfg.h.

◆ N775_STATEMACH_SHORTTIME

#define N775_STATEMACH_SHORTTIME   (1u)

N775 statemachine short time definition in ms

Definition at line 111 of file n775_cfg.h.

◆ N775_TDWAKE_MS

#define N775_TDWAKE_MS   (4u)

N775 Time between two consecutive wake-up messages in ms 4ms in datasheet

Definition at line 123 of file n775_cfg.h.

◆ N775_TIME_AFTER_ENUMERATION_MS

#define N775_TIME_AFTER_ENUMERATION_MS   (1u)

N775 time after enumeraiton in ms

Definition at line 138 of file n775_cfg.h.

◆ N775_TIME_BETWEEN_WAKEUP_MS

#define N775_TIME_BETWEEN_WAKEUP_MS   (4u)

N775 time between two wake up commands in ms

Definition at line 133 of file n775_cfg.h.

◆ N775_TIME_DAISYCHAIN_WAKEUP_MS

#define N775_TIME_DAISYCHAIN_WAKEUP_MS   (N775_N_N775 * (N775_TWAKECOM_MS + N775_TDWAKE_MS))

N775 time for daisy-chain to wake-up in ms

Definition at line 128 of file n775_cfg.h.

◆ N775_TRANSMISSION_TIMEOUT

#define N775_TRANSMISSION_TIMEOUT   (10u)

Timeout in milliseconds added to the transmission time for interrupt-based SPI transmission.

Definition at line 95 of file n775_cfg.h.

◆ N775_TRANSMIT_SPIERRLIMIT

#define N775_TRANSMIT_SPIERRLIMIT   (3u)

Maximum number of re-tries in case of SPI error during the communication with daisy chain before going into error state

Definition at line 144 of file n775_cfg.h.

◆ N775_TWAKECOM_MS

#define N775_TWAKECOM_MS   (3u)

N775 Maximum time from wakeup event to possible communication in ms 2.4ms in datasheet

Definition at line 117 of file n775_cfg.h.

◆ N775_TX_MESSAGE_LENGTH

#define N775_TX_MESSAGE_LENGTH   (7u)

775A Tx message length in bytes.

Definition at line 79 of file n775_cfg.h.

Function Documentation

◆ N775_Convert_MuxVoltages_to_Temperatures()

float N775_Convert_MuxVoltages_to_Temperatures ( float  v_adc_V)

converts a raw voltage from multiplexer to a temperature value in Celsius.

The temperatures are read from NTC elements via voltage dividers. This function implements the look-up table between voltage and temperature, taking into account the NTC characteristics and the voltage divider.

Parameters
v_adc_Vvoltage read from the multiplexer in V
Returns
temperature temperature value in deci °C

Definition at line 84 of file n775_cfg.c.

Variable Documentation

◆ n775_voltage_input_used

const uint8_t n775_voltage_input_used[BS_MAX_SUPPORTED_CELLS]
extern

Lookup table to indicate which voltage inpus are used

Definition at line 62 of file n775_cfg.c.