Hi,
I need to control a MAX17841B module with spi interface on an ATMEGA328PB
So, i don't know how i can control the module (https://datasheets.maximintegrated.com/en/ds/MAX17841B.pdf)
I think , I need to send an address and after several data ?
Thank you...
kealmlj:
Hi,I need to control a MAX17841B module with spi interface on an ATMEGA328PB
So, i don’t know how i can control the module (https://datasheets.maximintegrated.com/en/ds/MAX17841B.pdf)
I think , I need to send an address and after several data ?
Thank you…
based on table 10 and 11 in the datasheets something like this maybe…
(compiles, NOT tested!)
//Include Libraries
#include <SPI.h>
#define cs_pin 10
#define intr_pin 9
void MAX17841B_init() {
digitalWrite(cs_pin, LOW); //Select Chip
//Daisy-Chain Initialization Sequence
//TRANSACTION 1 Enable Keep-Alive mode (prior to the UART slave wake-up to prevent shutdown)
SPI.transfer(0x10); //response = xxh. Write Configuration 3 register
SPI.transfer(0x05); //response = xxh. Set keep - alive period to 160µs
//TRANSACTION 2 Enable Rx Interrupt flags for RX_Error and RX_Overflow
SPI.transfer(0x04); //response = xxh. Write RX_Interrupt_Enable register
SPI.transfer(0x88); //response = xxh. Set the RX_Error_INT_Enable and RX_Overflow_INT_Enable bits
//TRANSACTION 3 Clear receive buffer
SPI.transfer(0xE0); //response = xxh. Clear receive buffer
//TRANSACTION 4 Wake-up UART slave devices (transmit preambles)
SPI.transfer(0x0E); //response = xxh. Write Configuration 2 register
SPI.transfer(0x30); //response = xxh. Enable Transmit Preambles mode
//TRANSACTION 5 Wait for all UART slave devices to wake up (poll RX_Busy_Status bit)
SPI.transfer(0x01); //response = xxh. Read RX_Status register (RX_Busy_Status and RX_Empty_Status should be true)
SPI.transfer(0xFF); //response = 21h. If RX_Status = 21h, continue. Otherwise, repeat transaction until true or timeout.
//TRANSACTION 6 End of UART slave device wake-up period
SPI.transfer(0x0E); //response = xxh. Write Configuration 2 register
SPI.transfer(0x10); //response = xxh. Disable Transmit Preambles mode
//TRANSACTION 7 Wait for null message to be received (poll RX_Empty_Status bit)
SPI.transfer(0x01); //response = xxh. Read RX_Status register
//TRANSACTION 8 Clear transmit buffer
SPI.transfer(0x20); //response = xxh. Clear transmit buffer
//TRANSACTION 9 Clear receive buffer
SPI.transfer(0xE0); //response = xxh. Clear receive buffer
//TRANSACTION 10 Load the HELLOALL command sequence into the load queue
SPI.transfer(0xC0); //response = xxh. WR_LD_Q SPI command byte (write the load queue)
SPI.transfer(0x03); //response = xxh. Message length
SPI.transfer(0x57); //response = xxh. HELLOALL command byte
SPI.transfer(0x00); //response = xxh. Register address (0x00)
SPI.transfer(0x00); //response = xxh. Initialization address of HELLOALL
//TRANSACTION 11 Verify contents of the load queue
SPI.transfer(0xC1); //response = xxh. RD_LD_Q SPI command byte
SPI.transfer(0xFF); //response = 03h. OK
SPI.transfer(0xFF); //response = 57h. OK
SPI.transfer(0xFF); //response = 00h. OK
SPI.transfer(0xFF); //response = 00h. OK
//TRANSACTION 12 Transmit HELLOALL sequence
SPI.transfer(0xB0); //response = xxh. WR_NXT_LD_Q SPI command byte (write the next load queue)
//TRANSACTION 13 Poll RX_Stop_Status bit
SPI.transfer(0x01); //response = xxh. Read RX_Status register
SPI.transfer(0xFF); //response = 12h. If RX_Status[1] is true, continue. If false, then repeat transaction until true.
//TRANSACTION 14 Service receive buffer. Read the HELLOALL message that propagated through the daisy-chain and was
SPI.transfer(0x93); //response = xxh. RD_NXT_MSG SPI transaction
SPI.transfer(0xFF); //response = 57h. Sent command byte (HELLOALL)
SPI.transfer(0xFF); //response = 00h. Sent address = 00h
SPI.transfer(0xFF); //response = 02h. Returned address = 02h
//TRANSACTION 15 Check for receive buffer errors
SPI.transfer(0x09); //response = xxh. Read RX_Interrupt_Flags register
SPI.transfer(0xFF); //response = 00h. If no errors, continue. Otherwise, clear and go to error routine.
digitalWrite(cs_pin, HIGH); //Deselect Chip
}
void MAX17841B_writeAll() {
digitalWrite(cs_pin, LOW); //Select Chip
//TRANSACTION 1 Load the WRITEALL command sequence into the load queue
SPI.transfer(0xC0); //response = xxh. WR_LD_Q SPI command byte
SPI.transfer(0x06); //response = xxh. Message length = 6
SPI.transfer(0x02); //response = xxh. WRITEALL command byte
SPI.transfer(0x12); //response = xxh. Register address of the device
SPI.transfer(0xB1); //response = xxh. LS byte of register data to be written
SPI.transfer(0xB2); //response = xxh. MS byte of register data to be written
SPI.transfer(0xC4); //response = xxh. PEC byte for 02h, 12h, B1h, B2h
SPI.transfer(0x00); //response = xxh. Alive-counter byte (seed value = 0)
//TRANSACTION 2 Start transmitting the WRITEALL sequence from the transmit queue
SPI.transfer(0xB0); //response = xxh. WR_NXT_LD_Q SPI command byte
//TRANSACTION 3 Check if a message has been received into the receive buffer
SPI.transfer(0x01); //response = xxh. Read RX_Status register
SPI.transfer(0xFF); //response = 12h. If RX_Status[1] is true, continue. Otherwise, repeat until true or timeout.
//TRANSACTION 4 Read receive buffer to verify the sent WRITEALL message
SPI.transfer(0x93); //response = xxh. RD_NXT_MSG SPI
SPI.transfer(0xFF); //response = 02h. Sent command byte (WRITEALL)
SPI.transfer(0xFF); //response = 12h. Sent address
SPI.transfer(0xFF); //response = B1h. Sent LS byte
SPI.transfer(0xFF); //response = B2h. Sent MS byte
SPI.transfer(0xFF); //response = C4h. Sent PEC
SPI.transfer(0xFF); //response = 02h. Alive-counter byte (= sent seed + 2, if alive counter enabled)
//TRANSACTION 5 Check for receive buffer errors
SPI.transfer(0x09); //response = xxh. Read RX_Interrupt_Flags register
SPI.transfer(0xFF); //response = 00h. If no errors, continue. Otherwise, clear and go to error routine.
digitalWrite(cs_pin, HIGH); //Deselect Chip
}
void MAX17841B_readAll() {
digitalWrite(cs_pin, LOW); //Select Chip
//TRANSACTION 1 Load the READALL command sequence into the load queue
SPI.transfer(0xC0); //response = xxh. WR_NXT_LD_Q SPI command byte
SPI.transfer(0x09); //response = xxh. Message length (5 + 2 x n = 9)
SPI.transfer(0x03); //response = xxh. READALL command byte
SPI.transfer(0x12); //response = xxh. Register address
SPI.transfer(0x00); //response = xxh. Data-check byte (seed value = 00h)
SPI.transfer(0xCB); //response = xxh. PEC byte for bytes 03h, 12h, 00h
SPI.transfer(0x00); //response = xxh. Alive-counter byte (seed value = 00h)
//TRANSACTION 2 Start transmitting the READALL sequence
SPI.transfer(0xB0); //response = xxh. WR_NXT_LD_Q SPI command byte
//TRANSACTION 3 Check if a message has been received into the receive buffer
SPI.transfer(0x01); //response = xxh. Read the RX_Status register
SPI.transfer(0xFF); //response = 12h. If RX_Status[1] is true, continue. Otherwise, repeat until true or timeout.
//TRANSACTION 4 Read the receive buffer and verify that the device register data is what was written during the WRITEALLsequence
SPI.transfer(0x93); //response = xxh. RD_NXT_MSG SPI command byte
SPI.transfer(0xFF); //response = 03h. Sent command byte (READALL)
SPI.transfer(0xFF); //response = 12h. Sent register address
SPI.transfer(0xFF); //response = B1h. LS byte of device 1
SPI.transfer(0xFF); //response = B2h. MS byte of device 1
SPI.transfer(0xFF); //response = B1h. LS byte of device 0
SPI.transfer(0xFF); //response = B2h. MS byte of device 0
SPI.transfer(0xFF); //response = 00h. Data-check byte (= 00h if all status bits have been cleared)
SPI.transfer(0xFF); //response = 67h. PEC (for the previous 7 bytes)
SPI.transfer(0xFF); //response = 02h. Alive-counter byte (= sent seed + 2, if alive counter is enabled)
//TRANSACTION 5 Check for receive buffer errors
SPI.transfer(0x09); //response = xxh. Read RX_Interrupt_Flags register
SPI.transfer(0xFF); //response = 00h. If no errors, continue. Otherwise, clear and go to error routine
digitalWrite(cs_pin, HIGH); //Deselect Chip
}
void setup() {
Serial.begin(115200);
//initialise IOs and SPI comms
//SPI clock speed:4MHz, Data Shift:MSB First, Data Clock Idle: SPI_MODE0
SPI.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));
pinMode(cs_pin, OUTPUT); //MAX17841B_CS
digitalWrite(cs_pin, HIGH); //Deselect Chip
pinMode(intr_pin, INPUT); //MAX17841B_INT
MAX17841B_init();
MAX17841B_writeAll();
MAX17841B_readAll();
}
void loop() {
}
hope that gets you going! 
I would suggest you get there evaluation kit. This was originally an automotive part, probably custom. Your link does not work.
sherzaad:
based on table 10 and 11 in the datasheets something like this maybe…
(compiles, NOT tested!)//Include Libraries
#include <SPI.h>
#define cs_pin 10
#define intr_pin 9
void MAX17841B_init() {
digitalWrite(cs_pin, LOW); //Select Chip
//Daisy-Chain Initialization Sequence
//TRANSACTION 1 Enable Keep-Alive mode (prior to the UART slave wake-up to prevent shutdown)
SPI.transfer(0x10); //response = xxh. Write Configuration 3 register
SPI.transfer(0x05); //response = xxh. Set keep - alive period to 160µs
//TRANSACTION 2 Enable Rx Interrupt flags for RX_Error and RX_Overflow
SPI.transfer(0x04); //response = xxh. Write RX_Interrupt_Enable register
SPI.transfer(0x88); //response = xxh. Set the RX_Error_INT_Enable and RX_Overflow_INT_Enable bits
//TRANSACTION 3 Clear receive buffer
SPI.transfer(0xE0); //response = xxh. Clear receive buffer
//TRANSACTION 4 Wake-up UART slave devices (transmit preambles)
SPI.transfer(0x0E); //response = xxh. Write Configuration 2 register
SPI.transfer(0x30); //response = xxh. Enable Transmit Preambles mode
//TRANSACTION 5 Wait for all UART slave devices to wake up (poll RX_Busy_Status bit)
SPI.transfer(0x01); //response = xxh. Read RX_Status register (RX_Busy_Status and RX_Empty_Status should be true)
SPI.transfer(0xFF); //response = 21h. If RX_Status = 21h, continue. Otherwise, repeat transaction until true or timeout.
//TRANSACTION 6 End of UART slave device wake-up period
SPI.transfer(0x0E); //response = xxh. Write Configuration 2 register
SPI.transfer(0x10); //response = xxh. Disable Transmit Preambles mode
//TRANSACTION 7 Wait for null message to be received (poll RX_Empty_Status bit)
SPI.transfer(0x01); //response = xxh. Read RX_Status register
//TRANSACTION 8 Clear transmit buffer
SPI.transfer(0x20); //response = xxh. Clear transmit buffer
//TRANSACTION 9 Clear receive buffer
SPI.transfer(0xE0); //response = xxh. Clear receive buffer
//TRANSACTION 10 Load the HELLOALL command sequence into the load queue
SPI.transfer(0xC0); //response = xxh. WR_LD_Q SPI command byte (write the load queue)
SPI.transfer(0x03); //response = xxh. Message length
SPI.transfer(0x57); //response = xxh. HELLOALL command byte
SPI.transfer(0x00); //response = xxh. Register address (0x00)
SPI.transfer(0x00); //response = xxh. Initialization address of HELLOALL
//TRANSACTION 11 Verify contents of the load queue
SPI.transfer(0xC1); //response = xxh. RD_LD_Q SPI command byte
SPI.transfer(0xFF); //response = 03h. OK
SPI.transfer(0xFF); //response = 57h. OK
SPI.transfer(0xFF); //response = 00h. OK
SPI.transfer(0xFF); //response = 00h. OK
//TRANSACTION 12 Transmit HELLOALL sequence
SPI.transfer(0xB0); //response = xxh. WR_NXT_LD_Q SPI command byte (write the next load queue)
//TRANSACTION 13 Poll RX_Stop_Status bit
SPI.transfer(0x01); //response = xxh. Read RX_Status register
SPI.transfer(0xFF); //response = 12h. If RX_Status[1] is true, continue. If false, then repeat transaction until true.
//TRANSACTION 14 Service receive buffer. Read the HELLOALL message that propagated through the daisy-chain and was
SPI.transfer(0x93); //response = xxh. RD_NXT_MSG SPI transaction
SPI.transfer(0xFF); //response = 57h. Sent command byte (HELLOALL)
SPI.transfer(0xFF); //response = 00h. Sent address = 00h
SPI.transfer(0xFF); //response = 02h. Returned address = 02h
//TRANSACTION 15 Check for receive buffer errors
SPI.transfer(0x09); //response = xxh. Read RX_Interrupt_Flags register
SPI.transfer(0xFF); //response = 00h. If no errors, continue. Otherwise, clear and go to error routine.
digitalWrite(cs_pin, HIGH); //Deselect Chip
}
void MAX17841B_writeAll() {
digitalWrite(cs_pin, LOW); //Select Chip
//TRANSACTION 1 Load the WRITEALL command sequence into the load queue
SPI.transfer(0xC0); //response = xxh. WR_LD_Q SPI command byte
SPI.transfer(0x06); //response = xxh. Message length = 6
SPI.transfer(0x02); //response = xxh. WRITEALL command byte
SPI.transfer(0x12); //response = xxh. Register address of the device
SPI.transfer(0xB1); //response = xxh. LS byte of register data to be written
SPI.transfer(0xB2); //response = xxh. MS byte of register data to be written
SPI.transfer(0xC4); //response = xxh. PEC byte for 02h, 12h, B1h, B2h
SPI.transfer(0x00); //response = xxh. Alive-counter byte (seed value = 0)
//TRANSACTION 2 Start transmitting the WRITEALL sequence from the transmit queue
SPI.transfer(0xB0); //response = xxh. WR_NXT_LD_Q SPI command byte
//TRANSACTION 3 Check if a message has been received into the receive buffer
SPI.transfer(0x01); //response = xxh. Read RX_Status register
SPI.transfer(0xFF); //response = 12h. If RX_Status[1] is true, continue. Otherwise, repeat until true or timeout.
//TRANSACTION 4 Read receive buffer to verify the sent WRITEALL message
SPI.transfer(0x93); //response = xxh. RD_NXT_MSG SPI
SPI.transfer(0xFF); //response = 02h. Sent command byte (WRITEALL)
SPI.transfer(0xFF); //response = 12h. Sent address
SPI.transfer(0xFF); //response = B1h. Sent LS byte
SPI.transfer(0xFF); //response = B2h. Sent MS byte
SPI.transfer(0xFF); //response = C4h. Sent PEC
SPI.transfer(0xFF); //response = 02h. Alive-counter byte (= sent seed + 2, if alive counter enabled)
//TRANSACTION 5 Check for receive buffer errors
SPI.transfer(0x09); //response = xxh. Read RX_Interrupt_Flags register
SPI.transfer(0xFF); //response = 00h. If no errors, continue. Otherwise, clear and go to error routine.
digitalWrite(cs_pin, HIGH); //Deselect Chip
}
void MAX17841B_readAll() {
digitalWrite(cs_pin, LOW); //Select Chip
//TRANSACTION 1 Load the READALL command sequence into the load queue
SPI.transfer(0xC0); //response = xxh. WR_NXT_LD_Q SPI command byte
SPI.transfer(0x09); //response = xxh. Message length (5 + 2 x n = 9)
SPI.transfer(0x03); //response = xxh. READALL command byte
SPI.transfer(0x12); //response = xxh. Register address
SPI.transfer(0x00); //response = xxh. Data-check byte (seed value = 00h)
SPI.transfer(0xCB); //response = xxh. PEC byte for bytes 03h, 12h, 00h
SPI.transfer(0x00); //response = xxh. Alive-counter byte (seed value = 00h)
//TRANSACTION 2 Start transmitting the READALL sequence
SPI.transfer(0xB0); //response = xxh. WR_NXT_LD_Q SPI command byte
//TRANSACTION 3 Check if a message has been received into the receive buffer
SPI.transfer(0x01); //response = xxh. Read the RX_Status register
SPI.transfer(0xFF); //response = 12h. If RX_Status[1] is true, continue. Otherwise, repeat until true or timeout.
//TRANSACTION 4 Read the receive buffer and verify that the device register data is what was written during the WRITEALLsequence
SPI.transfer(0x93); //response = xxh. RD_NXT_MSG SPI command byte
SPI.transfer(0xFF); //response = 03h. Sent command byte (READALL)
SPI.transfer(0xFF); //response = 12h. Sent register address
SPI.transfer(0xFF); //response = B1h. LS byte of device 1
SPI.transfer(0xFF); //response = B2h. MS byte of device 1
SPI.transfer(0xFF); //response = B1h. LS byte of device 0
SPI.transfer(0xFF); //response = B2h. MS byte of device 0
SPI.transfer(0xFF); //response = 00h. Data-check byte (= 00h if all status bits have been cleared)
SPI.transfer(0xFF); //response = 67h. PEC (for the previous 7 bytes)
SPI.transfer(0xFF); //response = 02h. Alive-counter byte (= sent seed + 2, if alive counter is enabled)
//TRANSACTION 5 Check for receive buffer errors
SPI.transfer(0x09); //response = xxh. Read RX_Interrupt_Flags register
SPI.transfer(0xFF); //response = 00h. If no errors, continue. Otherwise, clear and go to error routine
digitalWrite(cs_pin, HIGH); //Deselect Chip
}
void setup() {
Serial.begin(115200);
//initialise IOs and SPI comms
//SPI clock speed:4MHz, Data Shift:MSB First, Data Clock Idle: SPI_MODE0
SPI.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));
pinMode(cs_pin, OUTPUT); //MAX17841B_CS
digitalWrite(cs_pin, HIGH); //Deselect Chip
pinMode(intr_pin, INPUT); //MAX17841B_INT
MAX17841B_init();
MAX17841B_writeAll();
MAX17841B_readAll();
}
void loop() {
}
hope that gets you going! ;)
Thank you very much ! I understand how I can send and receive with SPI interface right now ! Thank you, i’m going to test this
gilshultz:
I would suggest you get there evaluation kit. This was originally an automotive part, probably custom. Your link does not work.
Yes this is an automotive module to control cell in battery.
My link refer to the datasheet of the module
kealmlj:
Thank you very much ! I understand how I can send and receive with SPI interface right now ! Thank you, i’m going to test this
hope all goes well!
just to clarify, to get/view the ‘return’ value when using SPI.transfer() n’ you should update the code I proposed in the following manner for all the SPI.transfers():
byte c;
c = SPI.transfer(0x10); //0x10 to be updated to the desired value for each SPI transfer
Serial.println(c,HEX); //print to serial monitor in Hexadecimal format
hope that helps…
So If I understand when i Send an SPI Command (SPI.Transfer) I have a return value directly ?.. SPI.Transfer is a function that send and receive ?
kealmlj:
So If I understand when i Send an SPI Command (SPI.Transfer) I have a return value directly ?... SPI.Transfer is a function that send and receive ?
Yes that is correct.
ie for example if you do c = SPI.transfer(0x10);
'0x10' is sent out on the SPI MOSI line, and the received value (on the MISO line) is returned by the function and stored in 'c'.
Thanks ! So i Have one last question, how I can set the INT pin for the spi1 ?
kealmlj:
Thanks ! So i Have one last question, how I can set the INT pin for the spi1 ?
the INT pin is specific to the chip and not SPI comms.
not too sure what is the purpose of the INT pin here (ie what conditions it goes LOW). you would need to study the data sheet a bit more for that.
whether it needs to be checked before doing any SPI reads, I cannot say....