diff --git a/Makefile b/Makefile index 9fdecec8..8c8cfe70 100644 --- a/Makefile +++ b/Makefile @@ -64,6 +64,7 @@ C_SOURCES = \ Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_pwr.c \ Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_adc_ex.c \ Drivers/CMSIS/Device/ST/STM32F4xx/Source/Templates/system_stm32f4xx.c \ + MotorControl/utils.c \ MotorControl/low_level.c ASM_SOURCES = \ Drivers/CMSIS/Device/ST/STM32F4xx/Source/Templates/gcc/startup_stm32f405xx.s diff --git a/MotorControl/utils.c b/MotorControl/utils.c new file mode 100644 index 00000000..f361be27 --- /dev/null +++ b/MotorControl/utils.c @@ -0,0 +1,118 @@ + +#include + +int SVM(float alpha, float beta, float* tA, float* tB, float* tC) { + int Sextant; + + if (beta >= 0.0f) { + if (alpha >= 0.0f) { + //quadrant I + if (one_by_sqrt3 * beta > alpha) + Sextant = 2; //sextant v2-v3 + else + Sextant = 1; //sextant v1-v2 + + } else { + //quadrant II + if (-one_by_sqrt3 * beta > alpha) + Sextant = 3; //sextant v3-v4 + else + Sextant = 2; //sextant v2-v3 + } + } else { + if (alpha >= 0.0f) { + //quadrant IV + if (-one_by_sqrt3 * beta > alpha) + Sextant = 5; //sextant v5-v6 + else + Sextant = 6; //sextant v6-v1 + } else { + //quadrant III + if (one_by_sqrt3 * beta > alpha) + Sextant = 4; //sextant v4-v5 + else + Sextant = 5; //sextant v5-v6 + } + } + + switch (Sextant) { + // sextant v1-v2 + case 1: { + // Vector on-times + float t1 = alpha - one_by_sqrt3 * beta; + float t2 = two_by_sqrt3 * beta; + + // PWM timings + *tA = (1.0f - t1 - t2) * 0.5f; + *tB = *tA + t1; + *tC = *tB + t2; + + break; + } + // sextant v2-v3 + case 2: { + // Vector on-times + float t2 = alpha + one_by_sqrt3 * beta; + float t3 = -alpha + one_by_sqrt3 * beta; + + // PWM timings + *tB = (1.0f - t2 - t3) * 0.5f; + *tA = *tB + t3; + *tC = *tA + t2; + + break; + } + // sextant v3-v4 + case 3: { + // Vector on-times + float t3 = two_by_sqrt3 * beta; + float t4 = -alpha - one_by_sqrt3 * beta; + + // PWM timings + *tB = (1.0f - t3 - t4) * 0.5f; + *tC = *tB + t3; + *tA = *tC + t4; + + break; + } + // sextant v4-v5 + case 4: { + // Vector on-times + float t4 = -alpha + one_by_sqrt3 * beta; + float t5 = -two_by_sqrt3 * beta; + + // PWM timings + *tC = (1.0f - t4 - t5) * 0.5f; + *tB = *tC + t5; + *tA = *tB + t4; + + break; + } + // sextant v5-v6 + case 5: { + // Vector on-times + float t5 = -alpha - one_by_sqrt3 * beta; + float t6 = alpha - one_by_sqrt3 * beta; + + // PWM timings + *tC = (1.0f - t5 - t6) * 0.5f; + *tA = *tC + t5; + *tB = *tA + t6; + + break; + } + // sextant v6-v1 + case 6: { + // Vector on-times + float t6 = -two_by_sqrt3 * beta; + float t1 = alpha + one_by_sqrt3 * beta; + + // PWM timings + *tA = (1.0f - t6 - t1) * 0.5f; + *tC = *tA + t1; + *tB = tC + t6; + + break; + } + } +} diff --git a/MotorControl/utils.h b/MotorControl/utils.h new file mode 100644 index 00000000..da93d176 --- /dev/null +++ b/MotorControl/utils.h @@ -0,0 +1,11 @@ + +#ifndef __UTILS_H +#define __UTILS_H + +// Compute rising edge timings (0.0 - 1.0) as a function of alpha-beta +// as per the magnitude invariant clarke transform +// The magnitude of the alpha-beta vector may not be larger than sqrt(3)/2 +// Returns 0 on success, and -1 if the input was out of range +int SVM(float alpha, float beta, float* tA, float* tB, float* tC); + +#endif //__UTILS_H