| | |
|---|
| | | return (vbat_raw); |
|---|
| | | } |
|---|
| | | |
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| | | #define B20_SIGN_EXTEND_TEST (0x00100000UL) |
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| | | #define B20_SIGN_EXTEND_MASK (0xFFF00000UL) |
|---|
| | | /* offset from DRX_CONF_ID in bytes to 21-bit signed RX carrier integrator value */ |
|---|
| | | #define DRX_CARRIER_INT_OFFSET 0x28 |
|---|
| | | #define DRX_CARRIER_INT_LEN (3) |
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| | | #define DRX_CARRIER_INT_MASK 0x001FFFFF |
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| | | int32_t dwt_readcarrierintegrator(void) |
|---|
| | | { |
|---|
| | | uint32_t regval = 0 ; |
|---|
| | | int j ; |
|---|
| | | uint8_t buffer[DRX_CARRIER_INT_LEN] ; |
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| | | |
|---|
| | | /* Read 3 bytes into buffer (21-bit quantity) */ |
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| | | |
|---|
| | | dwt_readfromdevice(DRX_CONF_ID,DRX_CARRIER_INT_OFFSET,DRX_CARRIER_INT_LEN, buffer) ; |
|---|
| | | |
|---|
| | | for (j = 2 ; j >= 0 ; j --) // arrange the three bytes into an unsigned integer value |
|---|
| | | { |
|---|
| | | regval = (regval << 8) + buffer[j] ; |
|---|
| | | } |
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| | | |
|---|
| | | if (regval & B20_SIGN_EXTEND_TEST) regval |= B20_SIGN_EXTEND_MASK ; // sign extend bit #20 to whole word |
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| | | else regval &= DRX_CARRIER_INT_MASK ; // make sure upper bits are clear if not sign extending |
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| | | |
|---|
| | | return (int32_t) regval ; // cast unsigned value to signed quantity. |
|---|
| | | } |
|---|
| | | /* =============================================================================================== |
|---|
| | | List of expected (known) device ID handled by this software |
|---|
| | | =============================================================================================== |
|---|
