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109 lines
2.4 KiB
C++
109 lines
2.4 KiB
C++
#include "cordic.hpp"
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#include "hal.h"
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namespace cordic {
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#if !defined(TARGET_PLATFORM_L4)
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void init()
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{
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RCC->AHB2ENR |= RCC_AHB2ENR_CORDICEN;
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}
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static void prepare() {
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while (CORDIC->CSR & CORDIC_CSR_RRDY)
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asm("mov r0, %0" :: "r" (CORDIC->RDATA));
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}
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static uint32_t dtoq(double) {
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uint32_t res;
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asm("vcvt.s32.f64 d0, d0, #31;"
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"vmov %0, r5, d0"
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: "=r" (res));
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return res;
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}
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__attribute__((naked))
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static double qtod(uint32_t) {
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asm("eor r1, r1;"
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"vmov d0, r0, r1;"
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"vcvt.f64.s32 d0, d0, #31;"
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"bx lr");
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return 0;
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}
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__attribute__((naked))
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double mod(double, double) {
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asm("vdiv.f64 d2, d0, d1;"
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"vrintz.f64 d2;"
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"vmul.f64 d1, d1, d2;"
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"vsub.f64 d0, d0, d1;"
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"bx lr");
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return 0;
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}
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double cos(double x) {
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x = mod(x, 2 * math::PI) / math::PI;
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auto input = dtoq(x > 1. ? x - 2 : x);
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prepare();
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CORDIC->CSR = CORDIC_CSR_NARGS | CORDIC_CSR_NRES |
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(6 << CORDIC_CSR_PRECISION_Pos) |
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(0 << CORDIC_CSR_FUNC_Pos);
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CORDIC->WDATA = input;
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CORDIC->WDATA = input;
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while (!(CORDIC->CSR & CORDIC_CSR_RRDY));
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double cosx = qtod(CORDIC->RDATA) / x;
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[[maybe_unused]] auto sinx = CORDIC->RDATA;
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return cosx;
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}
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double sin(double x) {
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x = mod(x, 2 * math::PI) / math::PI;
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auto input = dtoq(x > 1. ? x - 2 : x);
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prepare();
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CORDIC->CSR = CORDIC_CSR_NARGS | CORDIC_CSR_NRES |
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(6 << CORDIC_CSR_PRECISION_Pos) |
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(1 << CORDIC_CSR_FUNC_Pos);
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CORDIC->WDATA = input;
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CORDIC->WDATA = input;
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while (!(CORDIC->CSR & CORDIC_CSR_RRDY));
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double sinx = qtod(CORDIC->RDATA) / x;
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[[maybe_unused]] auto cosx = CORDIC->RDATA;
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return sinx;
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}
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double tan(double x) {
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x = mod(x, 2 * math::PI) / math::PI;
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auto input = dtoq(x > 1. ? x - 2 : x);
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prepare();
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CORDIC->CSR = CORDIC_CSR_NARGS | CORDIC_CSR_NRES |
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(6 << CORDIC_CSR_PRECISION_Pos) |
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(1 << CORDIC_CSR_FUNC_Pos);
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CORDIC->WDATA = input;
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CORDIC->WDATA = input;
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while (!(CORDIC->CSR & CORDIC_CSR_RRDY));
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double sinx = qtod(CORDIC->RDATA) / x;
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double tanx = sinx * x / qtod(CORDIC->RDATA);
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return tanx;
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}
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#else // L4
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void init() {}
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double mod(double, double) { return 0; }
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double cos(double) { return 0; }
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double sin(double) { return 0; }
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double tan(double) { return 0; }
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#endif
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}
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