Diff: bq76pl536a.cpp

Revision:

0:47a258755906

Child:

1:4ae1a58697d7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bq76pl536a.cpp	Sun May 14 20:40:36 2017 +0000
@@ -0,0 +1,109 @@
+#include "bq76pl536a.h"
+//===========================================================================
+// Default constructor. Setup spi interface and run init functions
+BQ76PL536A::BQ76PL536A(SPI _spi, PinName _cs, u8t _numDev,  u16t _cov, u16t _cuv, u8t _balanceTimeout, bool _balanceEnabled)
+//===========================================================================
+:   spi(_spi),
+    cs(_cs),
+    numDev(_numDev),
+    cov(_cov),
+    cuv(_cuv),
+    balanceTimeout(_balanceTimeout),
+    balanceEnabled(_balanceEnabled)
+{
+    cs = 1;
+    softReset();
+    setAddresses();
+};
+
+
+
+
+//===========================================================================
+// Start conversion on all devices
+void BQ76PL536A::adcConvert()
+//===========================================================================
+{
+    write(BROADCAST_ADDR, ADC_CONVERT_REG, 1);
+}
+
+//===========================================================================
+// Address devices
+void BQ76PL536A::setAddresses()
+//===========================================================================
+{
+    // Address devices
+    for(u8t i=1; i<numDev; i++)    {
+        write(DISCOVERY_ADDR, ADDRESS_CONTROL_REG, i); //Write address to first discovered address
+        // write 1 then 0 to Alert Status Reg to remove alert
+        //write(i, ALERT_STATUS_REG, 0b10000000); //Write 1 to address bit of alert register
+        //write(i, ALERT_STATUS_REG, 0b00000000); //Write 0 to address bit of alert register to clear alert
+    }
+}
+
+//===========================================================================
+// Reset all devices in stack
+void BQ76PL536A::softReset()
+//===========================================================================
+{
+    write(BROADCAST_ADDR, RESET_REG, BQ76PL536A_RESET);
+}
+
+//===========================================================================
+// Read one or more bytes from the BQ76 device stack. Count does not include CRC byte.
+bool *BQ76PL536A::read(u8t deviceAddress, u8t regAddress, u8t count, u8t *pRegisterValue)
+//===========================================================================
+{
+    error = 0;
+    u8t logicalAddress = (deviceAddress << 1 | 0); // Shift address left 1 bit
+    //static u8t receivedData[length];
+    //memset(receivedData, 0, length);
+    static u8t crcInput[3] = {logicalAddress,regAddress,count};
+
+    cs = 0;
+    spi.write(logicalAddress);
+    spi.write(regAddress);
+    spi.write(count);
+
+    //Read data. Last byte is CRC data.
+    for (int i = 0; i <= count; i++) {
+        pRegisterValue[i] = spi.write(0x00);
+        if (i == count) {
+            if (pec(crcInput) != pRegisterValue[i])
+                error = 1;
+        }
+    }
+    cs = 1; //End of transmission, slave select high
+
+    return false;
+}
+
+//===========================================================================
+// Write one byte to the BQ76 device stack
+void BQ76PL536A::write(u8t deviceAddress, u8t regAddress, u8t regData)
+//===========================================================================
+{
+    u8t logicalAddress = ((deviceAddress << 1) | 1); // Shift address left one bit and set LSB
+    u8t crcInput[3] = {logicalAddress, regAddress, regData};
+
+    cs = 1;
+    spi.write(logicalAddress);
+    spi.write(regAddress);
+    spi.write(regData);
+    spi.write(pec(crcInput));
+    cs = 1;
+}
+
+//===========================================================================
+// Calculate CRC byte to verify data integrity
+u8t BQ76PL536A::pec(u8t crcBuffer[])
+//===========================================================================
+{
+    u8t crc = 0;
+    int temp = 0;
+    for (int i = 0; i < sizeof(crcBuffer)/sizeof(crcBuffer[0]) + 1; i++) {
+        temp = crc ^ crcBuffer[i];
+        crc = crcTable[temp];
+    }
+    return crc;
+}
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