Implement the stepper motor stuff, start work on UART interaction

This commit is contained in:
Kelvin Ly 2021-02-14 23:47:09 -05:00
parent a70bb3d733
commit c080c2aa2a
1 changed files with 218 additions and 4 deletions

View File

@ -4,6 +4,34 @@
#include <libopencm3/cm3/systick.h>
enum direction {
DIR_CLOCKWISE,
DIR_COUNTERCLOCKWISE
};
volatile struct {
bool active;
bool done;
int step_count;
enum direction dir;
int counter;
int increment;
int threshold;
int phase;
} stepper = {
true, false, 1000000, DIR_CLOCKWISE, 0, 1, 2, 0
};
volatile struct {
bool active;
bool done;
enum direction dir;
int count;
int tocount;
} brushed = {
false, false, DIR_CLOCKWISE, 0, 0
};
int main(void) {
rcc_periph_clock_enable(RCC_GPIOA);
rcc_periph_clock_enable(RCC_GPIOB);
@ -46,21 +74,207 @@ int main(void) {
systick_counter_disable();
systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
systick_set_reload(rcc_ahb_frequency/100000-1);
systick_set_reload(rcc_ahb_frequency/1000-1);
systick_clear();
systick_interrupt_enable();
systick_counter_enable();
int32_t val = 0;
while (1) {
if (stepper.done) {
stepper.done = false;
usart_send_blocking(USART2, 's');
}
if (brushed.done) {
brushed.done = false;
usart_send_blocking(USART2, 'r');
}
if ((USART_ISR(USART2) & USART_ISR_RXNE) != 0) {
// TODO process byte
uint8_t rx = usart_recv(USART2);
usart_send_blocking(USART2, rx);
// if it's a hexadecimal echo back and append it to val
if ((rx >= '0') && (rx <= '9')) {
usart_send_blocking(USART2, rx); // echo back
val <<= 4;
val |= (rx - '0');
} else if ((rx >= 'a') && (rx <= 'f')) {
usart_send_blocking(USART2, rx); // echo back
val <<= 4;
val |= (rx - 'a' + 10);
} else if ((rx >= 'A') && (rx <= 'F')) {
usart_send_blocking(USART2, rx); // echo back
val <<= 4;
val |= (rx - 'A' + 10);
} else {
switch (rx) {
case 's': // get status
if (stepper.active) {
usart_send_blocking(USART2, '!');
} else {
usart_send_blocking(USART2, '@');
}
if (brushed.active) {
usart_send_blocking(USART2, '#');
} else {
usart_send_blocking(USART2, '$');
}
break;
case 'w': // start stepper
usart_send_blocking(USART2, '!');
stepper.active = true;
break;
case 'W': // stop stepper
stepper.active = false;
usart_send_blocking(USART2, '@');
break;
case 'r': // start brushed motor
usart_send_blocking(USART2, '#');
brushed.count = 0;
brushed.active = true;
break;
case 'R': // stop brushed motor
usart_send_blocking(USART2, '$');
brushed.count = 0;
brushed.active = false;
break;
case 't': // read stepper counter
// TODO
break;
case 'T': // write stepper counter
// TODO
break;
case 'y': // read stepper increment
// TODO
break;
case 'Y': // write stepper increment
// TODO
break;
case 'u': // read stepper threshold
// TODO
break;
case 'U': // write stepper threshold
// TODO
break;
case 'i': // set stepper direction to clockwise
stepper.dir = DIR_CLOCKWISE;
usart_send_blocking(USART2, 'i');
break;
case 'I': // set stepper direction to counterclockwise
stepper.dir = DIR_COUNTERCLOCKWISE;
usart_send_blocking(USART2, 'I');
break;
case 'o': // write brushed counter
// TODO
break;
case 'O': // read brushed counter
// TODO
break;
case 'p': // set brushed direction to clockwise
brushed.dir = DIR_CLOCKWISE;
usart_send_blocking(USART2, 'p');
break;
case 'P': // set brushed direction to counterclockwise
brushed.dir = DIR_COUNTERCLOCKWISE;
usart_send_blocking(USART2, 'P');
break;
}
}
}
}
}
void SysTick_Handler(void);
void SysTick_Handler(void) {
const struct {
bool active;
bool positive;
} phase_lut[][2] = {
{{true, true}, {false, true}}, // A+
//{{true, true}, {true, true}}, // A+, B+
{{false, true}, {true, true}}, // B+
//{{true, false}, {true, true}}, // A-, B+
{{true, false}, {false, true}}, // A-
//{{true, false}, {true, false}}, // A-, B-
{{false, false}, {true, false}}, // B-
//{{true, true}, {true, false}}, // A+, B-
};
void sys_tick_handler(void);
void sys_tick_handler(void) {
if (!stepper.active) {
gpio_clear(GPIOA, GPIO5|GPIO6|GPIO7);
gpio_clear(GPIOB, GPIO1);
} else {
stepper.counter += stepper.increment;
if (stepper.counter >= stepper.threshold) {
--stepper.step_count;
stepper.counter -= stepper.threshold;
if (stepper.dir == DIR_CLOCKWISE) {
++stepper.phase;
} else {
--stepper.phase;
}
if (stepper.phase < 0) {
stepper.phase = 3;
}
if (stepper.phase >= 4) {
stepper.phase = 0;
}
}
if (stepper.step_count <= 0) {
stepper.counter = 0;
stepper.active = false;
stepper.done = true;
// power down stepper motor; TODO maybe lock its position?
gpio_clear(GPIOA, GPIO5|GPIO6|GPIO7);
gpio_clear(GPIOB, GPIO1);
} else {
// write to GPIO pins
// TODO maybe use a set of OR/AND masks instead? this works but probably
// isn't constant time
if (phase_lut[stepper.phase][0].active) {
if (phase_lut[stepper.phase][0].positive) {
gpio_clear(GPIOA, GPIO6);
gpio_set(GPIOB, GPIO1);
} else {
gpio_set(GPIOA, GPIO6);
gpio_clear(GPIOB, GPIO1);
}
} else {
gpio_clear(GPIOA, GPIO6);
gpio_clear(GPIOB, GPIO1);
}
if (phase_lut[stepper.phase][1].active) {
if (phase_lut[stepper.phase][1].positive) {
gpio_clear(GPIOA, GPIO7);
gpio_set(GPIOA, GPIO5);
} else {
gpio_set(GPIOA, GPIO7);
gpio_clear(GPIOA, GPIO5);
}
} else {
gpio_clear(GPIOA, GPIO7);
gpio_clear(GPIOA, GPIO5);
}
}
}
if (brushed.active) {
if (brushed.count == 0) {
// TODO toggle pins
}
++brushed.count;
if (brushed.count >= brushed.tocount) {
// TODO toggle pins
brushed.count = 0;
brushed.active = false;
brushed.done = true;
}
}
// TODO check limit switches
}