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static void | hw_divider_divmod_s32_start (int32_t a, int32_t b) |
| Start a signed asynchronous divideStart a divide of the specified signed parameters. You should wait for 8 cycles (__div_pause()) or wait for the ready bit to be set (hw_divider_wait_ready()) prior to reading the results. More...
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static void | hw_divider_divmod_u32_start (uint32_t a, uint32_t b) |
| Start an unsigned asynchronous divideStart a divide of the specified unsigned parameters. You should wait for 8 cycles (__div_pause()) or wait for the ready bit to be set (hw_divider_wait_ready()) prior to reading the results. More...
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static void | hw_divider_wait_ready (void) |
| Wait for a divide to completeWait for a divide to complete.
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static divmod_result_t | hw_divider_result_nowait (void) |
| Return result of HW divide, nowait. More...
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static divmod_result_t | hw_divider_result_wait (void) |
| Return result of last asynchronous HW divideThis function waits for the result to be ready by calling hw_divider_wait_ready(). More...
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static uint32_t | hw_divider_u32_quotient_wait (void) |
| Return result of last asynchronous HW divide, unsigned quotient onlyThis function waits for the result to be ready by calling hw_divider_wait_ready(). More...
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static int32_t | hw_divider_s32_quotient_wait (void) |
| Return result of last asynchronous HW divide, signed quotient onlyThis function waits for the result to be ready by calling hw_divider_wait_ready(). More...
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static uint32_t | hw_divider_u32_remainder_wait (void) |
| Return result of last asynchronous HW divide, unsigned remainder onlyThis function waits for the result to be ready by calling hw_divider_wait_ready(). More...
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static int32_t | hw_divider_s32_remainder_wait (void) |
| Return result of last asynchronous HW divide, signed remainder onlyThis function waits for the result to be ready by calling hw_divider_wait_ready(). More...
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divmod_result_t | hw_divider_divmod_s32 (int32_t a, int32_t b) |
| Do a signed HW divide and wait for resultDivide a by b , wait for calculation to complete, return result as a fixed point 32p32 value. More...
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divmod_result_t | hw_divider_divmod_u32 (uint32_t a, uint32_t b) |
| Do an unsigned HW divide and wait for resultDivide a by b , wait for calculation to complete, return result as a fixed point 32p32 value. More...
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static uint32_t | to_quotient_u32 (divmod_result_t r) |
| Efficient extraction of unsigned quotient from 32p32 fixed point. More...
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static int32_t | to_quotient_s32 (divmod_result_t r) |
| Efficient extraction of signed quotient from 32p32 fixed point. More...
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static uint32_t | to_remainder_u32 (divmod_result_t r) |
| Efficient extraction of unsigned remainder from 32p32 fixed point. More...
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static int32_t | to_remainder_s32 (divmod_result_t r) |
| Efficient extraction of signed remainder from 32p32 fixed point. More...
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static uint32_t | hw_divider_u32_quotient (uint32_t a, uint32_t b) |
| Do an unsigned HW divide, wait for result, return quotientDivide a by b , wait for calculation to complete, return quotient. More...
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static uint32_t | hw_divider_u32_remainder (uint32_t a, uint32_t b) |
| Do an unsigned HW divide, wait for result, return remainderDivide a by b , wait for calculation to complete, return remainder. More...
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static int32_t | hw_divider_quotient_s32 (int32_t a, int32_t b) |
| Do a signed HW divide, wait for result, return quotientDivide a by b , wait for calculation to complete, return quotient. More...
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static int32_t | hw_divider_remainder_s32 (int32_t a, int32_t b) |
| Do a signed HW divide, wait for result, return remainderDivide a by b , wait for calculation to complete, return remainder. More...
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static void | hw_divider_pause (void) |
| Pause for exact amount of time needed for a asynchronous divide to complete.
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static uint32_t | hw_divider_u32_quotient_inlined (uint32_t a, uint32_t b) |
| Do a hardware unsigned HW divide, wait for result, return quotientDivide a by b , wait for calculation to complete, return quotient. More...
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static uint32_t | hw_divider_u32_remainder_inlined (uint32_t a, uint32_t b) |
| Do a hardware unsigned HW divide, wait for result, return remainderDivide a by b , wait for calculation to complete, return remainder. More...
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static int32_t | hw_divider_s32_quotient_inlined (int32_t a, int32_t b) |
| Do a hardware signed HW divide, wait for result, return quotientDivide a by b , wait for calculation to complete, return quotient. More...
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static int32_t | hw_divider_s32_remainder_inlined (int32_t a, int32_t b) |
| Do a hardware signed HW divide, wait for result, return remainderDivide a by b , wait for calculation to complete, return remainder. More...
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void | hw_divider_save_state (hw_divider_state_t *dest) |
| Save the calling cores hardware divider stateCopy the current core's hardware divider state into the provided structure. This method waits for the divider results to be stable, then copies them to memory. They can be restored via hw_divider_restore_state() More...
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void | hw_divider_restore_state (hw_divider_state_t *src) |
| Load a saved hardware divider state into the current core's hardware dividerCopy the passed hardware divider state into the hardware divider. More...
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The SIO contains an 8-cycle signed/unsigned divide/modulo circuit, per core. Calculation is started by writing a dividend and divisor to the two argument registers, DIVIDEND and DIVISOR. The divider calculates the quotient / and remainder % of this division over the next 8 cycles, and on the 9th cycle the results can be read from the two result registers DIV_QUOTIENT and DIV_REMAINDER. A 'ready' bit in register DIV_CSR can be polled to wait for the calculation to complete, or software can insert a fixed 8-cycle delay
This header provides low level macros and inline functions for accessing the hardware dividers directly, and perhaps most usefully performing asynchronous divides. These functions however do not follow the regular SDK conventions for saving/restoring the divider state, so are not generally safe to call from interrupt handlers
The pico_divider library provides a more user friendly set of APIs over the divider (and support for 64 bit divides), and of course by default regular C language integer divisions are redirected through that library, meaning you can just use C level /
and %
operators and gain the benefits of the fast hardware divider.