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stmhal: Servo driver can move at a given speed.

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This commit is contained in:
Damien George 2014-03-22 18:34:16 +00:00
parent 626f6b8133
commit 0119fc7532
6 changed files with 147 additions and 51 deletions
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144
stmhal/servo.c
View File

@ -2,6 +2,7 @@
#include "stm32f4xx_hal.h"
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
@ -13,25 +14,85 @@
// they are both 32-bit counters with 16-bit prescaler
// we use TIM2
STATIC TIM_HandleTypeDef servo_TimHandle;
#define PYB_SERVO_NUM (4)
typedef struct _pyb_servo_obj_t {
mp_obj_base_t base;
uint16_t servo_id;
uint16_t time_left;
int16_t pulse_accum;
uint16_t pulse_cur;
uint16_t pulse_dest;
} pyb_servo_obj_t;
STATIC const mp_obj_type_t servo_obj_type;
STATIC pyb_servo_obj_t pyb_servo_obj[PYB_SERVO_NUM];
TIM_HandleTypeDef servo_TIM2_Handle;
void servo_init(void) {
// TIM2 clock enable
__TIM2_CLK_ENABLE();
// set up and enable interrupt
HAL_NVIC_SetPriority(TIM2_IRQn, 6, 0);
HAL_NVIC_EnableIRQ(TIM2_IRQn);
// PWM clock configuration
servo_TimHandle.Instance = TIM2;
servo_TimHandle.Init.Period = 2000; // timer cycles at 50Hz
servo_TimHandle.Init.Prescaler = ((SystemCoreClock / 2) / 100000) - 1; // timer runs at 100kHz
servo_TimHandle.Init.ClockDivision = 0;
servo_TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
HAL_TIM_PWM_Init(&servo_TimHandle);
servo_TIM2_Handle.Instance = TIM2;
servo_TIM2_Handle.Init.Period = 2000; // timer cycles at 50Hz
servo_TIM2_Handle.Init.Prescaler = ((SystemCoreClock / 2) / 100000) - 1; // timer runs at 100kHz
servo_TIM2_Handle.Init.ClockDivision = 0;
servo_TIM2_Handle.Init.CounterMode = TIM_COUNTERMODE_UP;
HAL_TIM_PWM_Init(&servo_TIM2_Handle);
// reset servo objects
for (int i = 0; i < PYB_SERVO_NUM; i++) {
pyb_servo_obj[i].base.type = &servo_obj_type;
pyb_servo_obj[i].servo_id = i + 1;
pyb_servo_obj[i].time_left = 0;
pyb_servo_obj[i].pulse_cur = 150; // units of 10us
pyb_servo_obj[i].pulse_dest = 0;
}
}
STATIC void servo_init_channel(int channel_in) {
#include "led.h"
void servo_timer_irq_callback(void) {
led_toggle(1);
bool need_it = false;
for (int i = 0; i < PYB_SERVO_NUM; i++) {
pyb_servo_obj_t *s = &pyb_servo_obj[i];
if (s->pulse_cur != s->pulse_dest) {
if (s->time_left <= 1) {
s->pulse_cur = s->pulse_dest;
s->time_left = 0;
} else {
s->pulse_accum += s->pulse_dest - s->pulse_cur;
s->pulse_cur += s->pulse_accum / s->time_left;
s->pulse_accum %= s->time_left;
s->time_left--;
need_it = true;
}
switch (s->servo_id) {
case 1: TIM2->CCR1 = s->pulse_cur; break;
case 2: TIM2->CCR2 = s->pulse_cur; break;
case 3: TIM2->CCR3 = s->pulse_cur; break;
case 4: TIM2->CCR4 = s->pulse_cur; break;
}
}
}
if (need_it) {
__HAL_TIM_ENABLE_IT(&servo_TIM2_Handle, TIM_IT_UPDATE);
} else {
__HAL_TIM_DISABLE_IT(&servo_TIM2_Handle, TIM_IT_UPDATE);
}
}
STATIC void servo_init_channel(pyb_servo_obj_t *s) {
uint32_t pin;
uint32_t channel;
switch (channel_in) {
switch (s->servo_id) {
case 1: pin = GPIO_PIN_0; channel = TIM_CHANNEL_1; break;
case 2: pin = GPIO_PIN_1; channel = TIM_CHANNEL_2; break;
case 3: pin = GPIO_PIN_2; channel = TIM_CHANNEL_3; break;
@ -51,13 +112,13 @@ STATIC void servo_init_channel(int channel_in) {
// PWM mode configuration
TIM_OC_InitTypeDef oc_init;
oc_init.OCMode = TIM_OCMODE_PWM1;
oc_init.Pulse = 150; // units of 10us
oc_init.Pulse = s->pulse_cur; // units of 10us
oc_init.OCPolarity = TIM_OCPOLARITY_HIGH;
oc_init.OCFastMode = TIM_OCFAST_DISABLE;
HAL_TIM_PWM_ConfigChannel(&servo_TimHandle, &oc_init, channel);
HAL_TIM_PWM_ConfigChannel(&servo_TIM2_Handle, &oc_init, channel);
// start PWM
HAL_TIM_PWM_Start(&servo_TimHandle, channel);
HAL_TIM_PWM_Start(&servo_TIM2_Handle, channel);
}
/******************************************************************************/
@ -89,35 +150,39 @@ STATIC mp_obj_t pyb_pwm_set(mp_obj_t period, mp_obj_t pulse) {
MP_DEFINE_CONST_FUN_OBJ_2(pyb_pwm_set_obj, pyb_pwm_set);
typedef struct _pyb_servo_obj_t {
mp_obj_base_t base;
uint servo_id;
} pyb_servo_obj_t;
STATIC void servo_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
pyb_servo_obj_t *self = self_in;
print(env, "<Servo %lu>", self->servo_id);
print(env, "<Servo %lu at %lu>", self->servo_id, self->pulse_cur);
}
STATIC mp_obj_t servo_obj_angle(mp_obj_t self_in, mp_obj_t angle) {
pyb_servo_obj_t *self = self_in;
STATIC mp_obj_t servo_obj_angle(uint n_args, const mp_obj_t *args) {
pyb_servo_obj_t *self = args[0];
if (n_args == 1) {
// get angle
return mp_obj_new_int((self->pulse_cur - 152) * 90 / 85);
} else {
#if MICROPY_ENABLE_FLOAT
machine_int_t v = 152 + 85.0 * mp_obj_get_float(angle) / 90.0;
machine_int_t v = 152 + 85.0 * mp_obj_get_float(args[1]) / 90.0;
#else
machine_int_t v = 152 + 85 * mp_obj_get_int(angle) / 90;
machine_int_t v = 152 + 85 * mp_obj_get_int(args[1]) / 90;
#endif
if (v < 65) { v = 65; }
if (v > 210) { v = 210; }
switch (self->servo_id) {
case 1: TIM2->CCR1 = v; break;
case 2: TIM2->CCR2 = v; break;
case 3: TIM2->CCR3 = v; break;
case 4: TIM2->CCR4 = v; break;
if (v < 65) { v = 65; }
if (v > 210) { v = 210; }
self->pulse_dest = v;
if (n_args == 2) {
// set angle immediately
self->time_left = 0;
} else {
// set angle over a given time (given in milli seconds)
self->time_left = mp_obj_get_int(args[2]) / 20;
self->pulse_accum = 0;
}
servo_timer_irq_callback();
return mp_const_none;
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(servo_obj_angle_obj, servo_obj_angle);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(servo_obj_angle_obj, 1, 3, servo_obj_angle);
STATIC const mp_method_t servo_methods[] = {
{ "angle", &servo_obj_angle_obj },
@ -131,12 +196,17 @@ STATIC const mp_obj_type_t servo_obj_type = {
.methods = servo_methods,
};
STATIC mp_obj_t pyb_Servo(mp_obj_t servo_id) {
pyb_servo_obj_t *o = m_new_obj(pyb_servo_obj_t);
o->base.type = &servo_obj_type;
o->servo_id = mp_obj_get_int(servo_id);
servo_init_channel(o->servo_id);
return o;
STATIC mp_obj_t pyb_Servo(mp_obj_t servo_id_o) {
machine_int_t servo_id = mp_obj_get_int(servo_id_o) - 1;
if (0 <= servo_id && servo_id < PYB_SERVO_NUM) {
pyb_servo_obj_t *s = &pyb_servo_obj[servo_id];
s->pulse_dest = s->pulse_cur;
s->time_left = 0;
servo_init_channel(s);
return s;
} else {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "Servo %d does not exist", servo_id));
}
}
MP_DEFINE_CONST_FUN_OBJ_1(pyb_Servo_obj, pyb_Servo);

3
stmhal/servo.h
View File

@ -1,4 +1,7 @@
extern TIM_HandleTypeDef servo_TIM2_Handle;
void servo_init(void);
void servo_timer_irq_callback(void);
MP_DECLARE_CONST_FUN_OBJ(pyb_servo_set_obj);
MP_DECLARE_CONST_FUN_OBJ(pyb_pwm_set_obj);

14
stmhal/stm32f4xx_hal_msp.c
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@ -50,6 +50,12 @@
#include "usbd_cdc_msc.h"
#include "usbd_cdc_interface.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "servo.h"
/** @addtogroup STM32F4xx_HAL_Driver
* @{
*/
@ -155,6 +161,14 @@ void HAL_RTC_MspDeInit(RTC_HandleTypeDef *hrtc)
__HAL_RCC_RTC_DISABLE();
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
if (htim == &USBD_CDC_TIM3_Handle) {
USBD_CDC_HAL_TIM_PeriodElapsedCallback();
} else if (htim == &servo_TIM2_Handle) {
servo_timer_irq_callback();
}
}
/**
* @}
*/

11
stmhal/stm32f4xx_it.c
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@ -42,12 +42,15 @@
#include "stm32f4xx_it.h"
#include "stm32f4xx_hal.h"
#include "usbd_cdc_msc.h"
#include "usbd_cdc_interface.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "exti.h"
#include "servo.h"
/** @addtogroup STM32F4xx_HAL_Examples
* @{
@ -64,7 +67,6 @@
extern void fatality();
extern PCD_HandleTypeDef hpcd;
extern TIM_HandleTypeDef USBD_CDC_TimHandle;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
@ -349,9 +351,14 @@ void RTC_WKUP_IRQHandler(void) {
Handle_EXTI_Irq(EXTI_RTC_WAKEUP);
}
void TIM2_IRQHandler(void) {
// servo timer is TIM2
HAL_TIM_IRQHandler(&servo_TIM2_Handle);
}
void TIM3_IRQHandler(void) {
// USBD CDC timer is TIM3
HAL_TIM_IRQHandler(&USBD_CDC_TimHandle);
HAL_TIM_IRQHandler(&USBD_CDC_TIM3_Handle);
}
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

19
stmhal/usbd_cdc_interface.c
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@ -66,7 +66,7 @@ static int user_interrupt_char = VCP_CHAR_NONE;
static void *user_interrupt_data = NULL;
/* TIM handler declaration */
TIM_HandleTypeDef USBD_CDC_TimHandle;
TIM_HandleTypeDef USBD_CDC_TIM3_Handle;
/* USB handler declaration */
extern USBD_HandleTypeDef hUSBDDevice;
@ -132,7 +132,7 @@ static int8_t CDC_Itf_Init(void)
/*##-4- Start the TIM Base generation in interrupt mode ####################*/
/* Start Channel1 */
if(HAL_TIM_Base_Start_IT(&USBD_CDC_TimHandle) != HAL_OK)
if(HAL_TIM_Base_Start_IT(&USBD_CDC_TIM3_Handle) != HAL_OK)
{
/* Starting Error */
}
@ -250,8 +250,7 @@ static int8_t CDC_Itf_Control(uint8_t cmd, uint8_t* pbuf, uint16_t length) {
* @param htim: TIM handle
* @retval None
*/
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
void USBD_CDC_HAL_TIM_PeriodElapsedCallback(void) {
uint32_t buffptr;
uint32_t buffsize;
@ -388,7 +387,7 @@ int USBD_CDC_RxGet(void) {
static void TIM_Config(void)
{
/* Set TIMx instance */
USBD_CDC_TimHandle.Instance = USBD_CDC_TIMx;
USBD_CDC_TIM3_Handle.Instance = USBD_CDC_TIMx;
/* Initialize TIM3 peripheral as follow:
+ Period = 10000 - 1
@ -396,11 +395,11 @@ static void TIM_Config(void)
+ ClockDivision = 0
+ Counter direction = Up
*/
USBD_CDC_TimHandle.Init.Period = (USBD_CDC_POLLING_INTERVAL*1000) - 1;
USBD_CDC_TimHandle.Init.Prescaler = 84-1;
USBD_CDC_TimHandle.Init.ClockDivision = 0;
USBD_CDC_TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
if(HAL_TIM_Base_Init(&USBD_CDC_TimHandle) != HAL_OK)
USBD_CDC_TIM3_Handle.Init.Period = (USBD_CDC_POLLING_INTERVAL*1000) - 1;
USBD_CDC_TIM3_Handle.Init.Prescaler = 84-1;
USBD_CDC_TIM3_Handle.Init.ClockDivision = 0;
USBD_CDC_TIM3_Handle.Init.CounterMode = TIM_COUNTERMODE_UP;
if(HAL_TIM_Base_Init(&USBD_CDC_TIM3_Handle) != HAL_OK)
{
/* Initialization Error */
}

7
stmhal/usbd_cdc_interface.h
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@ -36,8 +36,8 @@
/* Definition for TIMx clock resources */
#define USBD_CDC_TIMx TIM3
#define USBD_CDC_TIMx_CLK_ENABLE __TIM3_CLK_ENABLE
#define USBD_CDC_TIMx_FORCE_RESET() __USART3_FORCE_RESET()
#define USBD_CDC_TIMx_RELEASE_RESET() __USART3_RELEASE_RESET()
#define USBD_CDC_TIMx_FORCE_RESET() __TIM3_FORCE_RESET()
#define USBD_CDC_TIMx_RELEASE_RESET() __TIM3_RELEASE_RESET()
/* Definition for TIMx's NVIC */
#define USBD_CDC_TIMx_IRQn TIM3_IRQn
@ -47,8 +47,11 @@
The period depends on USBD_CDC_POLLING_INTERVAL */
#define USBD_CDC_POLLING_INTERVAL 10 /* in ms. The max is 65 and the min is 1 */
extern TIM_HandleTypeDef USBD_CDC_TIM3_Handle;
extern const USBD_CDC_ItfTypeDef USBD_CDC_fops;
void USBD_CDC_HAL_TIM_PeriodElapsedCallback(void);
int USBD_CDC_IsConnected(void);
void USBD_CDC_SetInterrupt(int chr, void *data);
void USBD_CDC_Tx(const char *str, uint32_t len);