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micropython/ports/psoc6/machine_bitstream.c
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#include "py/mpconfig.h" | |
#include "py/mphal.h" | |
#include "FreeRTOS.h" | |
#include "task.h" | |
#include "py/runtime.h" | |
#include "py/mphal.h" | |
#include "extmod/modmachine.h" | |
#if MICROPY_PY_MACHINE_BITSTREAM | |
const uint32_t timing_sequence_1[] = {500, 1125, 800, 750}; | |
uint32_t range = 0; | |
void machine_bitstream_high_low(mp_hal_pin_obj_t pin, uint32_t *timing_ns, const uint8_t *buf, size_t len) { | |
GPIO_PRT_Type *base = CYHAL_GET_PORTADDR(pin); | |
uint32_t pinNum = CYHAL_GET_PIN(pin); | |
uint32_t fcpu_mhz = mp_hal_get_cpu_freq() / 1000000; | |
if (memcmp(timing_ns, timing_sequence_1, 4 * sizeof(uint32_t)) == 0) { | |
range = 0; | |
} else { | |
for (size_t i = 0; i < 4; ++i) { | |
if ((timing_ns[i]) <= 150) { | |
mp_raise_ValueError(MP_ERROR_TEXT("Timing is not supported")); | |
} | |
} | |
range = 1; | |
} | |
// Convert ns to cycles [high_time_0, low_time_0, high_time_1, low_time_1]. | |
for (size_t i = 0; i < 4; ++i) { | |
timing_ns[i] = fcpu_mhz * timing_ns[i] / 1000; | |
} | |
taskENTER_CRITICAL(); // FreeRTOS function for critical section | |
switch (range) | |
{ | |
case 0: | |
for (size_t i = 0; i < len; i++) | |
{ | |
uint8_t b = buf[i]; | |
// Send each bit of the byte | |
for (size_t j = 0; j < 8; j++) | |
{ | |
bool bit = (b & 0x80) != 0; | |
b <<= 1; | |
switch (bit) | |
{ | |
// Send a 1-bit | |
case 1: | |
// sendOneBit(); | |
Cy_GPIO_Write(base, pinNum, 1); | |
Cy_GPIO_Write(base, pinNum, 1); | |
Cy_GPIO_Write(base, pinNum, 1); | |
Cy_GPIO_Write(base, pinNum, 1); | |
Cy_GPIO_Write(base, pinNum, 0); | |
Cy_GPIO_Write(base, pinNum, 0); | |
break; | |
// Send a 0-bit | |
case 0: | |
// sendZeroBit(); | |
Cy_GPIO_Write(base, pinNum, 1); | |
Cy_GPIO_Write(base, pinNum, 1); | |
Cy_GPIO_Write(base, pinNum, 0); | |
Cy_GPIO_Write(base, pinNum, 0); | |
Cy_GPIO_Write(base, pinNum, 0); | |
Cy_GPIO_Write(base, pinNum, 0); | |
Cy_GPIO_Write(base, pinNum, 0); | |
break; | |
} | |
} | |
} | |
break; | |
default: | |
for (size_t i = 0; i < len; ++i) { | |
uint8_t b = buf[i]; | |
for (size_t j = 0; j < 8; ++j) { | |
uint32_t *t = &timing_ns[b >> 6 & 2]; | |
Cy_GPIO_Write(base, pinNum, 1); | |
Cy_SysLib_DelayCycles(t[0]); | |
Cy_GPIO_Write(base, pinNum, 0); | |
Cy_SysLib_DelayCycles(t[1]); | |
b <<= 1; | |
} | |
} | |
break; | |
} | |
taskEXIT_CRITICAL(); | |
} | |
#endif // MICROPY_PY_MACHINE_BITSTREAM |