David Wahl / BQ76PL536A

Initial rough start to the BQ76PL536A (or BQ76PL536A-Q1) code. Free to use as long as you make any changes/improvements publicly available. Please notify me of any improvements.

bq76pl536a.cpp@1:4ae1a58697d7, 2020-07-29 (annotated)

Committer:
dmwahl
Date:
Wed Jul 29 03:11:51 2020 +0000
Revision:
1:4ae1a58697d7
Parent:
0:47a258755906
Child:
2:7083c7257556
write and pec functions working

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dmwahl 0:47a258755906 1 #include "bq76pl536a.h"
dmwahl 0:47a258755906 2 //===========================================================================
dmwahl 0:47a258755906 3 // Default constructor. Setup spi interface and run init functions
dmwahl 0:47a258755906 4 BQ76PL536A::BQ76PL536A(SPI _spi, PinName _cs, u8t _numDev, u16t _cov, u16t _cuv, u8t _balanceTimeout, bool _balanceEnabled)
dmwahl 0:47a258755906 5 //===========================================================================
dmwahl 1:4ae1a58697d7 6 : spi(_spi),
dmwahl 1:4ae1a58697d7 7 cs(_cs),
dmwahl 1:4ae1a58697d7 8 numDev(_numDev),
dmwahl 1:4ae1a58697d7 9 cov(_cov),
dmwahl 1:4ae1a58697d7 10 cuv(_cuv),
dmwahl 1:4ae1a58697d7 11 balanceTimeout(_balanceTimeout),
dmwahl 1:4ae1a58697d7 12 balanceEnabled(_balanceEnabled)
dmwahl 0:47a258755906 13 {
dmwahl 1:4ae1a58697d7 14 DigitalOut cs(_cs);
dmwahl 0:47a258755906 15 cs = 1;
dmwahl 1:4ae1a58697d7 16 spi.format(8,1);
dmwahl 1:4ae1a58697d7 17 spi.frequency(500000);
dmwahl 1:4ae1a58697d7 18
dmwahl 1:4ae1a58697d7 19 cs=0;
dmwahl 1:4ae1a58697d7 20 wait_ms(1);
dmwahl 1:4ae1a58697d7 21 cs=1;
dmwahl 1:4ae1a58697d7 22 wait_ms(1);
dmwahl 1:4ae1a58697d7 23
dmwahl 1:4ae1a58697d7 24 //softReset();
dmwahl 0:47a258755906 25 setAddresses();
dmwahl 0:47a258755906 26 };
dmwahl 0:47a258755906 27
dmwahl 0:47a258755906 28
dmwahl 0:47a258755906 29
dmwahl 0:47a258755906 30
dmwahl 0:47a258755906 31 //===========================================================================
dmwahl 0:47a258755906 32 // Start conversion on all devices
dmwahl 0:47a258755906 33 void BQ76PL536A::adcConvert()
dmwahl 0:47a258755906 34 //===========================================================================
dmwahl 0:47a258755906 35 {
dmwahl 0:47a258755906 36 write(BROADCAST_ADDR, ADC_CONVERT_REG, 1);
dmwahl 0:47a258755906 37 }
dmwahl 0:47a258755906 38
dmwahl 0:47a258755906 39 //===========================================================================
dmwahl 1:4ae1a58697d7 40 // Reset all devices in stack
dmwahl 1:4ae1a58697d7 41 void BQ76PL536A::softReset()
dmwahl 1:4ae1a58697d7 42 //===========================================================================
dmwahl 1:4ae1a58697d7 43 {
dmwahl 1:4ae1a58697d7 44 write(BROADCAST_ADDR, RESET_REG, BQ76PL536A_RESET);
dmwahl 1:4ae1a58697d7 45 }
dmwahl 1:4ae1a58697d7 46
dmwahl 1:4ae1a58697d7 47 //===========================================================================
dmwahl 0:47a258755906 48 // Address devices
dmwahl 0:47a258755906 49 void BQ76PL536A::setAddresses()
dmwahl 0:47a258755906 50 //===========================================================================
dmwahl 0:47a258755906 51 {
dmwahl 0:47a258755906 52 // Address devices
dmwahl 1:4ae1a58697d7 53 for(u8t i=0; i<numDev; i++) {
dmwahl 1:4ae1a58697d7 54 write(i, ADDRESS_CONTROL_REG, i+1); //Write address to device 1 (for testing only)
dmwahl 1:4ae1a58697d7 55
dmwahl 1:4ae1a58697d7 56 //write(DISCOVERY_ADDR, ADDRESS_CONTROL_REG, i); //Write address to first discovered address
dmwahl 0:47a258755906 57 // write 1 then 0 to Alert Status Reg to remove alert
dmwahl 0:47a258755906 58 //write(i, ALERT_STATUS_REG, 0b10000000); //Write 1 to address bit of alert register
dmwahl 0:47a258755906 59 //write(i, ALERT_STATUS_REG, 0b00000000); //Write 0 to address bit of alert register to clear alert
dmwahl 0:47a258755906 60 }
dmwahl 0:47a258755906 61 }
dmwahl 0:47a258755906 62
dmwahl 0:47a258755906 63 //===========================================================================
dmwahl 1:4ae1a58697d7 64 // Device status
dmwahl 1:4ae1a58697d7 65 u8t BQ76PL536A::devStatus()
dmwahl 0:47a258755906 66 //===========================================================================
dmwahl 0:47a258755906 67 {
dmwahl 1:4ae1a58697d7 68 //update to use numDev
dmwahl 1:4ae1a58697d7 69 u8t currentStatus[1];
dmwahl 1:4ae1a58697d7 70 read(1,DEVICE_STATUS_REG,1,currentStatus);
dmwahl 1:4ae1a58697d7 71 return currentStatus[0];
dmwahl 0:47a258755906 72 }
dmwahl 1:4ae1a58697d7 73 //===========================================================================
dmwahl 1:4ae1a58697d7 74
dmwahl 0:47a258755906 75
dmwahl 0:47a258755906 76 //===========================================================================
dmwahl 0:47a258755906 77 // Read one or more bytes from the BQ76 device stack. Count does not include CRC byte.
dmwahl 0:47a258755906 78 bool *BQ76PL536A::read(u8t deviceAddress, u8t regAddress, u8t count, u8t *pRegisterValue)
dmwahl 0:47a258755906 79 //===========================================================================
dmwahl 0:47a258755906 80 {
dmwahl 0:47a258755906 81 error = 0;
dmwahl 0:47a258755906 82 u8t logicalAddress = (deviceAddress << 1 | 0); // Shift address left 1 bit
dmwahl 0:47a258755906 83 //static u8t receivedData[length];
dmwahl 0:47a258755906 84 //memset(receivedData, 0, length);
dmwahl 1:4ae1a58697d7 85 u8t crcInput[3+count];
dmwahl 1:4ae1a58697d7 86 crcInput[0] = logicalAddress;
dmwahl 1:4ae1a58697d7 87 crcInput[1] = regAddress;
dmwahl 1:4ae1a58697d7 88 crcInput[2] = count;
dmwahl 0:47a258755906 89
dmwahl 0:47a258755906 90 cs = 0;
dmwahl 1:4ae1a58697d7 91 spi.write(deviceAddress);
dmwahl 0:47a258755906 92 spi.write(regAddress);
dmwahl 0:47a258755906 93 spi.write(count);
dmwahl 0:47a258755906 94
dmwahl 0:47a258755906 95 //Read data. Last byte is CRC data.
dmwahl 0:47a258755906 96 for (int i = 0; i <= count; i++) {
dmwahl 0:47a258755906 97 pRegisterValue[i] = spi.write(0x00);
dmwahl 1:4ae1a58697d7 98 if (i != count) {
dmwahl 1:4ae1a58697d7 99 crcInput[3+i] = pRegisterValue[i];
dmwahl 1:4ae1a58697d7 100 }
dmwahl 0:47a258755906 101 if (i == count) {
dmwahl 1:4ae1a58697d7 102 if (pec(crcInput,3+count) != pRegisterValue[i])
dmwahl 0:47a258755906 103 error = 1;
dmwahl 0:47a258755906 104 }
dmwahl 0:47a258755906 105 }
dmwahl 0:47a258755906 106 cs = 1; //End of transmission, slave select high
dmwahl 0:47a258755906 107 return false;
dmwahl 0:47a258755906 108 }
dmwahl 0:47a258755906 109
dmwahl 0:47a258755906 110 //===========================================================================
dmwahl 1:4ae1a58697d7 111 // Write one byte to the BQ76 device stack. Should add code to read back written register and compare...
dmwahl 0:47a258755906 112 void BQ76PL536A::write(u8t deviceAddress, u8t regAddress, u8t regData)
dmwahl 0:47a258755906 113 //===========================================================================
dmwahl 0:47a258755906 114 {
dmwahl 1:4ae1a58697d7 115 u8t logicalAddress = (deviceAddress << 1 | 1); // Shift address left one bit and set LSB
dmwahl 0:47a258755906 116 u8t crcInput[3] = {logicalAddress, regAddress, regData};
dmwahl 0:47a258755906 117
dmwahl 1:4ae1a58697d7 118 cs = 0;
dmwahl 0:47a258755906 119 spi.write(logicalAddress);
dmwahl 0:47a258755906 120 spi.write(regAddress);
dmwahl 0:47a258755906 121 spi.write(regData);
dmwahl 1:4ae1a58697d7 122 spi.write(pec(crcInput, sizeof(crcInput)/sizeof(crcInput[0])));
dmwahl 0:47a258755906 123 cs = 1;
dmwahl 0:47a258755906 124 }
dmwahl 0:47a258755906 125
dmwahl 0:47a258755906 126 //===========================================================================
dmwahl 0:47a258755906 127 // Calculate CRC byte to verify data integrity
dmwahl 1:4ae1a58697d7 128 u8t BQ76PL536A::pec(u8t crcBuffer[], u8t crcLength)
dmwahl 0:47a258755906 129 //===========================================================================
dmwahl 0:47a258755906 130 {
dmwahl 1:4ae1a58697d7 131 //u8t crcTestInput[3] = {0x01,0x3b,0x01}; // should return 0x02
dmwahl 0:47a258755906 132 u8t crc = 0;
dmwahl 1:4ae1a58697d7 133 u8t temp = 0;
dmwahl 1:4ae1a58697d7 134 for (u8t i = 0; i < crcLength; i++) {
dmwahl 0:47a258755906 135 temp = crc ^ crcBuffer[i];
dmwahl 0:47a258755906 136 crc = crcTable[temp];
dmwahl 0:47a258755906 137 }
dmwahl 0:47a258755906 138 return crc;
dmwahl 0:47a258755906 139 }