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cc3200: Simplify the Timer API and correct the documents. 

Make the PWM duty cycle configurable from 0.00 to 100.00 by
accepting values from 0 to 10000.
Add automatic Pin assignment when operating in PWM mode.
This commit is contained in:
danicampora 2016-02-14 13:46:04 +01:00
parent 562bcffd3a
commit 73c9f85b4c
9 changed files with 125 additions and 248 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
cc3200/boards/cc3200_af.csv
View File

@ -1,11 +1,11 @@
Pin,Name,Default,AF0,AF1,AF2,AF3,AF4,AF5,AF6,AF7,AF8,AF9,AF10,AF11,AF12,AF13,AF14,AF15,ADC
1,GP10,GP10,GP10,I2C0_SCL,,TIM3_PWM0,,,SD0_CLK,UART1_TX,,,,,TIM0_CC1,,,,
2,GP11,GP11,GP11,I2C0_SDA,,TIM3_PWM1,pXCLK(XVCLK),,SD0_CMD,UART1_RX,,,,,TIM1_CC0,I2S0_FS,,,
3,GP12,GP12,GP12,,,I2S0_CLK,pVS(VSYNC),I2C0_SCL,,UART0_TX,,,,,TIM1_CC1,,,,
4,GP13,GP13,GP13,,,,pHS(HSYNC),I2C0_SDA,,UART0_RX,,,,,TIM2_CC0,,,,
5,GP14,GP14,GP14,,,,pDATA8(CAM_D4),I2C0_SCL,,SPI0_CLK,,,,,TIM2_CC1,,,,
6,GP15,GP15,GP15,,,,pDATA9(CAM_D5),I2C0_SDA,,SPI0_MISO,SD0_DAT0,,,,,TIM3_CC0,,,
7,GP16,GP16,GP16,,,,pDATA10(CAM_D6),UART1_TX,,SPI0_MOSI,SD0_CLK,,,,,TIM3_CC1,,,
1,GP10,GP10,GP10,I2C0_SCL,,TIM3_PWM,,,SD0_CLK,UART1_TX,,,,,TIM0_CC,,,,
2,GP11,GP11,GP11,I2C0_SDA,,TIM3_PWM,pXCLK(XVCLK),,SD0_CMD,UART1_RX,,,,,TIM1_CC,I2S0_FS,,,
3,GP12,GP12,GP12,,,I2S0_CLK,pVS(VSYNC),I2C0_SCL,,UART0_TX,,,,,TIM1_CC,,,,
4,GP13,GP13,GP13,,,,pHS(HSYNC),I2C0_SDA,,UART0_RX,,,,,TIM2_CC,,,,
5,GP14,GP14,GP14,,,,pDATA8(CAM_D4),I2C0_SCL,,SPI0_CLK,,,,,TIM2_CC,,,,
6,GP15,GP15,GP15,,,,pDATA9(CAM_D5),I2C0_SDA,,SPI0_MISO,SD0_DAT0,,,,,TIM3_CC,,,
7,GP16,GP16,GP16,,,,pDATA10(CAM_D6),UART1_TX,,SPI0_MOSI,SD0_CLK,,,,,TIM3_CC,,,
8,GP17,GP17,GP17,,,,pDATA11(CAM_D7),UART1_RX,,SPI0_CS0,SD0_CMD,,,,,,,,
9,VDD_DIG1,VDD_DIG1,VDD_DIG1,,,,,,,,,,,,,,,,
10,VIN_IO1,VIN_IO1,VIN_IO1,,,,,,,,,,,,,,,,
@ -13,13 +13,13 @@ Pin,Name,Default,AF0,AF1,AF2,AF3,AF4,AF5,AF6,AF7,AF8,AF9,AF10,AF11,AF12,AF13,AF1
12,FLASH_SPI_DOUT,FLASH_SPI_DOUT,FLASH_SPI_DOUT,,,,,,,,,,,,,,,,
13,FLASH_SPI_DIN,FLASH_SPI_DIN,FLASH_SPI_DIN,,,,,,,,,,,,,,,,
14,FLASH_SPI_CS,FLASH_SPI_CS,FLASH_SPI_CS,,,,,,,,,,,,,,,,
15,GP22,GP22,GP22,,,,,TIM2_CC0,,I2S0_FS,,,,,,,,,
15,GP22,GP22,GP22,,,,,TIM2_CC,,I2S0_FS,,,,,,,,,
16,GP23,TDI,GP23,TDI,UART1_TX,,,,,,,I2C0_SCL,,,,,,,
17,GP24,TDO,GP24,TDO,UART1_RX,,TIM3_CC0,TIM0_PWM0,I2S0_FS,,,I2C0_SDA,,,,,,,
17,GP24,TDO,GP24,TDO,UART1_RX,,TIM3_CC,TIM0_PWM,I2S0_FS,,,I2C0_SDA,,,,,,,
18,GP28,GP28,GP28,,,,,,,,,,,,,,,,
19,TCK,TCK,,TCK,,,,,,,TIM1_PWM2,,,,,,,,
19,TCK,TCK,,TCK,,,,,,,TIM1_PWM,,,,,,,,
20,GP29,TMS,GP29,TMS,,,,,,,,,,,,,,,
21,GP25,SOP2,GP25,,I2S0_FS,,,,,,,TIM1_PWM0,,,,,,,
21,GP25,SOP2,GP25,,I2S0_FS,,,,,,,TIM1_PWM,,,,,,,
22,WLAN_XTAL_N,WLAN_XTAL_N,WLAN_XTAL_N,,,,,,,,,,,,,,,,
23,WLAN_XTAL_P,WLAN_XTAL_P,WLAN_XTAL_P,,,,,,,,,,,,,,,,
24,VDD_PLL,VDD_PLL,VDD_PLL,,,,,,,,,,,,,,,,
@ -48,19 +48,19 @@ Pin,Name,Default,AF0,AF1,AF2,AF3,AF4,AF5,AF6,AF7,AF8,AF9,AF10,AF11,AF12,AF13,AF1
47,VDD_ANA2,VDD_ANA2,VDD_ANA2,,,,,,,,,,,,,,,,
48,VDD_ANA1,VDD_ANA1,VDD_ANA1,,,,,,,,,,,,,,,,
49,VDD_RAM,VDD_RAM,VDD_RAM,,,,,,,,,,,,,,,,
50,GP0,GP0,GP0,,,UART0_RTS,I2S0_DAT0,,I2S0_DAT1,TIM0_CC0,,SPI0_CS0,UART1_RTS,,UART0_CTS,,,,
50,GP0,GP0,GP0,,,UART0_RTS,I2S0_DAT0,,I2S0_DAT1,TIM0_CC,,SPI0_CS0,UART1_RTS,,UART0_CTS,,,,
51,RTC_XTAL_P,RTC_XTAL_P,RTC_XTAL_P,,,,,,,,,,,,,,,,
52,RTC_XTAL_N,RTC_XTAL_N,GP32,,I2S0_CLK,,I2S0_DAT0,,UART0_RTS,,SPI0_MOSI,,,,,,,,
53,GP30,GP30,GP30,,I2S0_CLK,I2S0_FS,TIM2_CC1,,,SPI0_MISO,,UART0_TX,,,,,,,
53,GP30,GP30,GP30,,I2S0_CLK,I2S0_FS,TIM2_CC,,,SPI0_MISO,,UART0_TX,,,,,,,
54,VIN_IO2,VIN_IO2,VIN_IO2,,,,,,,,,,,,,,,,
55,GP1,GP1,GP1,,,UART0_TX,pCLK (PIXCLK),,UART1_TX,TIM0_CC1,,,,,,,,,
55,GP1,GP1,GP1,,,UART0_TX,pCLK (PIXCLK),,UART1_TX,TIM0_CC,,,,,,,,,
56,VDD_DIG2,VDD_DIG2,VDD_DIG2,,,,,,,,,,,,,,,,
57,GP2,GP2,GP2,,,UART0_RX,,,UART1_RX,TIM1_CC0,,,,,,,,,ADC0_CH0
57,GP2,GP2,GP2,,,UART0_RX,,,UART1_RX,TIM1_CC,,,,,,,,,ADC0_CH0
58,GP3,GP3,GP3,,,,pDATA7(CAM_D3),,UART1_TX,,,,,,,,,,ADC0_CH1
59,GP4,GP4,GP4,,,,pDATA6(CAM_D2),,UART1_RX,,,,,,,,,,ADC0_CH2
60,GP5,GP5,GP5,,,,pDATA5(CAM_D1),,I2S0_DAT1,TIM2_CC1,,,,,,,,,ADC0_CH3
61,GP6,GP6,GP6,,,UART1_CTS,pDATA4(CAM_D0),UART0_RTS,UART0_CTS,TIM3_CC0,,,,,,,,,
60,GP5,GP5,GP5,,,,pDATA5(CAM_D1),,I2S0_DAT1,TIM2_CC,,,,,,,,,ADC0_CH3
61,GP6,GP6,GP6,,,UART1_CTS,pDATA4(CAM_D0),UART0_RTS,UART0_CTS,TIM3_CC,,,,,,,,,
62,GP7,GP7,GP7,,,UART1_RTS,,,,,,,UART0_RTS,UART0_TX,,I2S0_CLK,,,
63,GP8,GP8,GP8,,,,,,SD0_IRQ,I2S0_FS,,,,,TIM3_CC0,,,,
64,GP9,GP9,GP9,,,TIM2_PWM1,,,SD0_DAT0,I2S0_DAT0,,,,,TIM0_CC0,,,,
63,GP8,GP8,GP8,,,,,,SD0_IRQ,I2S0_FS,,,,,TIM3_CC,,,,
64,GP9,GP9,GP9,,,TIM2_PWM,,,SD0_DAT0,I2S0_DAT0,,,,,TIM0_CC,,,,
65,GND_TAB,GND_TAB,GND_TAB,,,,,,,,,,,,,,,,

1 Pin Name Default AF0 AF1 AF2 AF3 AF4 AF5 AF6 AF7 AF8 AF9 AF10 AF11 AF12 AF13 AF14 AF15 ADC
2 1 GP10 GP10 GP10 I2C0_SCL TIM3_PWM0 TIM3_PWM SD0_CLK UART1_TX TIM0_CC1 TIM0_CC
3 2 GP11 GP11 GP11 I2C0_SDA TIM3_PWM1 TIM3_PWM pXCLK(XVCLK) SD0_CMD UART1_RX TIM1_CC0 TIM1_CC I2S0_FS
4 3 GP12 GP12 GP12 I2S0_CLK pVS(VSYNC) I2C0_SCL UART0_TX TIM1_CC1 TIM1_CC
5 4 GP13 GP13 GP13 pHS(HSYNC) I2C0_SDA UART0_RX TIM2_CC0 TIM2_CC
6 5 GP14 GP14 GP14 pDATA8(CAM_D4) I2C0_SCL SPI0_CLK TIM2_CC1 TIM2_CC
7 6 GP15 GP15 GP15 pDATA9(CAM_D5) I2C0_SDA SPI0_MISO SD0_DAT0 TIM3_CC0 TIM3_CC
8 7 GP16 GP16 GP16 pDATA10(CAM_D6) UART1_TX SPI0_MOSI SD0_CLK TIM3_CC1 TIM3_CC
9 8 GP17 GP17 GP17 pDATA11(CAM_D7) UART1_RX SPI0_CS0 SD0_CMD
10 9 VDD_DIG1 VDD_DIG1 VDD_DIG1
11 10 VIN_IO1 VIN_IO1 VIN_IO1
13 12 FLASH_SPI_DOUT FLASH_SPI_DOUT FLASH_SPI_DOUT
14 13 FLASH_SPI_DIN FLASH_SPI_DIN FLASH_SPI_DIN
15 14 FLASH_SPI_CS FLASH_SPI_CS FLASH_SPI_CS
16 15 GP22 GP22 GP22 TIM2_CC0 TIM2_CC I2S0_FS
17 16 GP23 TDI GP23 TDI UART1_TX I2C0_SCL
18 17 GP24 TDO GP24 TDO UART1_RX TIM3_CC0 TIM3_CC TIM0_PWM0 TIM0_PWM I2S0_FS I2C0_SDA
19 18 GP28 GP28 GP28
20 19 TCK TCK TCK TIM1_PWM2 TIM1_PWM
21 20 GP29 TMS GP29 TMS
22 21 GP25 SOP2 GP25 I2S0_FS TIM1_PWM0 TIM1_PWM
23 22 WLAN_XTAL_N WLAN_XTAL_N WLAN_XTAL_N
24 23 WLAN_XTAL_P WLAN_XTAL_P WLAN_XTAL_P
25 24 VDD_PLL VDD_PLL VDD_PLL
48 47 VDD_ANA2 VDD_ANA2 VDD_ANA2
49 48 VDD_ANA1 VDD_ANA1 VDD_ANA1
50 49 VDD_RAM VDD_RAM VDD_RAM
51 50 GP0 GP0 GP0 UART0_RTS I2S0_DAT0 I2S0_DAT1 TIM0_CC0 TIM0_CC SPI0_CS0 UART1_RTS UART0_CTS
52 51 RTC_XTAL_P RTC_XTAL_P RTC_XTAL_P
53 52 RTC_XTAL_N RTC_XTAL_N GP32 I2S0_CLK I2S0_DAT0 UART0_RTS SPI0_MOSI
54 53 GP30 GP30 GP30 I2S0_CLK I2S0_FS TIM2_CC1 TIM2_CC SPI0_MISO UART0_TX
55 54 VIN_IO2 VIN_IO2 VIN_IO2
56 55 GP1 GP1 GP1 UART0_TX pCLK (PIXCLK) UART1_TX TIM0_CC1 TIM0_CC
57 56 VDD_DIG2 VDD_DIG2 VDD_DIG2
58 57 GP2 GP2 GP2 UART0_RX UART1_RX TIM1_CC0 TIM1_CC ADC0_CH0
59 58 GP3 GP3 GP3 pDATA7(CAM_D3) UART1_TX ADC0_CH1
60 59 GP4 GP4 GP4 pDATA6(CAM_D2) UART1_RX ADC0_CH2
61 60 GP5 GP5 GP5 pDATA5(CAM_D1) I2S0_DAT1 TIM2_CC1 TIM2_CC ADC0_CH3
62 61 GP6 GP6 GP6 UART1_CTS pDATA4(CAM_D0) UART0_RTS UART0_CTS TIM3_CC0 TIM3_CC
63 62 GP7 GP7 GP7 UART1_RTS UART0_RTS UART0_TX I2S0_CLK
64 63 GP8 GP8 GP8 SD0_IRQ I2S0_FS TIM3_CC0 TIM3_CC
65 64 GP9 GP9 GP9 TIM2_PWM1 TIM2_PWM SD0_DAT0 I2S0_DAT0 TIM0_CC0 TIM0_CC
66 65 GND_TAB GND_TAB GND_TAB

3
cc3200/boards/make-pins.py
View File

@ -12,7 +12,7 @@ SUPPORTED_AFS = { 'UART': ('TX', 'RX', 'RTS', 'CTS'),
'SPI': ('CLK', 'MOSI', 'MISO', 'CS0'),
#'I2S': ('CLK', 'FS', 'DAT0', 'DAT1'),
'I2C': ('SDA', 'SCL'),
'TIM': ('PWM0', 'PWM1', 'CC0', 'CC1'),
'TIM': ('PWM'),
'SD': ('CLK', 'CMD', 'DAT0'),
'ADC': ('CH0', 'CH1', 'CH2', 'CH3')
}
@ -44,6 +44,7 @@ class AF:
def print(self):
print (' AF({:16s}, {:4d}, {:8s}, {:4d}, {:8s}), // {}'.format(self.name, self.idx, self.fn, self.unit, self.type, self.name))
class Pin:
"""Holds the information associated with a pin."""
def __init__(self, name, port, gpio_bit, pin_num):

4
cc3200/misc/mperror.c
View File

@ -196,6 +196,10 @@ void nlr_jump_fail(void *val) {
void mperror_enable_heartbeat (bool enable) {
if (enable) {
#ifndef BOOTLOADER
// configure the led again
pin_config ((pin_obj_t *)&MICROPY_SYS_LED_GPIO, PIN_MODE_0, GPIO_DIR_MODE_OUT, PIN_TYPE_STD, 0, PIN_STRENGTH_6MA);
#endif
mperror_heart_beat.enabled = true;
mperror_heart_beat.do_disable = false;
mperror_heartbeat_switch_off();

19
cc3200/mods/pybpin.c
View File

@ -60,7 +60,6 @@ DECLARE PRIVATE FUNCTIONS
STATIC pin_obj_t *pin_find_named_pin(const mp_obj_dict_t *named_pins, mp_obj_t name);
STATIC pin_obj_t *pin_find_pin_by_port_bit (const mp_obj_dict_t *named_pins, uint port, uint bit);
STATIC int8_t pin_obj_find_af (const pin_obj_t* pin, uint8_t fn, uint8_t unit, uint8_t type);
STATIC int8_t pin_find_af_index (const pin_obj_t* pin, uint8_t fn, uint8_t unit, uint8_t type);
STATIC void pin_free_af_from_pins (uint8_t fn, uint8_t unit, uint8_t type);
STATIC void pin_deassign (pin_obj_t* pin);
STATIC void pin_obj_configure (const pin_obj_t *self);
@ -199,6 +198,14 @@ uint8_t pin_find_peripheral_type (const mp_obj_t pin, uint8_t fn, uint8_t unit)
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
}
int8_t pin_find_af_index (const pin_obj_t* pin, uint8_t fn, uint8_t unit, uint8_t type) {
int8_t af = pin_obj_find_af(pin, fn, unit, type);
if (af < 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
}
return af;
}
/******************************************************************************
DEFINE PRIVATE FUNCTIONS
******************************************************************************/
@ -231,14 +238,6 @@ STATIC int8_t pin_obj_find_af (const pin_obj_t* pin, uint8_t fn, uint8_t unit, u
return -1;
}
STATIC int8_t pin_find_af_index (const pin_obj_t* pin, uint8_t fn, uint8_t unit, uint8_t type) {
int8_t af = pin_obj_find_af(pin, fn, unit, type);
if (af < 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
}
return af;
}
STATIC void pin_free_af_from_pins (uint8_t fn, uint8_t unit, uint8_t type) {
mp_map_t *named_map = mp_obj_dict_get_map((mp_obj_t)&pin_board_pins_locals_dict);
for (uint i = 0; i < named_map->used - 1; i++) {
@ -248,7 +247,7 @@ STATIC void pin_free_af_from_pins (uint8_t fn, uint8_t unit, uint8_t type) {
// check if the pin supports the target af
int af = pin_obj_find_af(pin, fn, unit, type);
if (af > 0 && af == pin->af) {
// the pin is assigned to the target af, de-assign it
// the pin supports the target af, de-assign it
pin_deassign (pin);
}
}

6
cc3200/mods/pybpin.h
View File

@ -72,10 +72,7 @@ enum {
};
enum {
PIN_TYPE_TIM_PWM0 = 0,
PIN_TYPE_TIM_PWM1,
PIN_TYPE_TIM_CC0,
PIN_TYPE_TIM_CC1,
PIN_TYPE_TIM_PWM = 0,
};
enum {
@ -139,5 +136,6 @@ pin_obj_t *pin_find(mp_obj_t user_obj);
void pin_assign_pins_af (mp_obj_t *pins, uint32_t n_pins, uint32_t pull, uint32_t fn, uint32_t unit);
uint8_t pin_find_peripheral_unit (const mp_obj_t pin, uint8_t fn, uint8_t type);
uint8_t pin_find_peripheral_type (const mp_obj_t pin, uint8_t fn, uint8_t unit);
int8_t pin_find_af_index (const pin_obj_t* pin, uint8_t fn, uint8_t unit, uint8_t type);;
#endif // PYBPIN_H_

185
cc3200/mods/pybtimer.c
View File

@ -43,7 +43,10 @@
#include "interrupt.h"
#include "prcm.h"
#include "timer.h"
#include "pin.h"
#include "pybtimer.h"
#include "pybpin.h"
#include "pins.h"
#include "mpirq.h"
#include "pybsleep.h"
#include "mpexception.h"
@ -55,30 +58,8 @@
/// Each timer consists of a counter that counts up at a certain rate. The rate
/// at which it counts is the peripheral clock frequency (in Hz) divided by the
/// timer prescaler. When the counter reaches the timer period it triggers an
/// event, and the counter resets back to zero. By using the callback method,
/// event, and the counter resets back to zero. By using the irq method,
/// the timer event can call a Python function.
///
/// Example usage to toggle an LED at a fixed frequency:
///
/// tim = pyb.Timer(3) # create a timer object using timer 3
/// tim.init(mode=Timer.PERIODIC) # initialize it in periodic mode
/// tim_ch = tim.channel(Timer.A, freq=2) # configure channel A at a frequency of 2Hz
/// tim_ch.callback(handler=lambda t:led.toggle()) # toggle a LED on every cycle of the timer
///
/// Further examples:
///
/// tim1 = pyb.Timer(2, mode=Timer.EVENT_COUNT) # initialize it capture mode
/// tim2 = pyb.Timer(1, mode=Timer.PWM) # initialize it in PWM mode
/// tim_ch = tim1.channel(Timer.A, freq=1, polarity=Timer.POSITIVE) # start the event counter with a frequency of 1Hz and triggered by positive edges
/// tim_ch = tim2.channel(Timer.B, freq=10000, duty_cycle=50) # start the PWM on channel B with a 50% duty cycle
/// tim_ch.time() # get the current time in usec (can also be set)
/// tim_ch.freq(20) # set the frequency (can also get)
/// tim_ch.duty_cycle(30) # set the duty cycle to 30% (can also get)
/// tim_ch.duty_cycle(30, Timer.NEGATIVE) # set the duty cycle to 30% and change the polarity to negative
/// tim_ch.event_count() # get the number of captured events
/// tim_ch.event_time() # get the the time of the last captured event
/// tim_ch.period(2000000) # change the period to 2 seconds
///
/******************************************************************************
DECLARE PRIVATE CONSTANTS
@ -89,7 +70,6 @@
#define PYBTIMER_TIMEOUT_TRIGGER (0x01)
#define PYBTIMER_MATCH_TRIGGER (0x02)
#define PYBTIMER_EVENT_TRIGGER (0x04)
#define PYBTIMER_SRC_FREQ_HZ HAL_FCPU_HZ
@ -112,8 +92,8 @@ typedef struct _pyb_timer_channel_obj_t {
uint32_t frequency;
uint32_t period;
uint16_t channel;
uint16_t duty_cycle;
uint8_t polarity;
uint8_t duty_cycle;
} pyb_timer_channel_obj_t;
/******************************************************************************
@ -125,6 +105,7 @@ STATIC pyb_timer_obj_t pyb_timer_obj[PYBTIMER_NUM_TIMERS] = {{.timer = TIMERA0_B
{.timer = TIMERA2_BASE, .peripheral = PRCM_TIMERA2},
{.timer = TIMERA3_BASE, .peripheral = PRCM_TIMERA3}};
STATIC const mp_obj_type_t pyb_timer_channel_type;
STATIC const mp_obj_t pyb_timer_pwm_pin[8] = {&pin_GP24, MP_OBJ_NULL, &pin_GP25, MP_OBJ_NULL, MP_OBJ_NULL, &pin_GP9, &pin_GP10, &pin_GP11};
/******************************************************************************
DECLARE PRIVATE FUNCTIONS
@ -231,9 +212,13 @@ STATIC uint32_t compute_prescaler_period_and_match_value(pyb_timer_channel_obj_t
// check limit values for the duty cycle
if (ch->duty_cycle == 0) {
*match_out = period_c - 1;
}
else {
*match_out = period_c - ((period_c * ch->duty_cycle) / 100);
} else {
if (period_c > 0xFFFF) {
uint32_t match = (period_c * 100) / 10000;
*match_out = period_c - ((match * ch->duty_cycle) / 100);
} else {
*match_out = period_c - ((period_c * ch->duty_cycle) / 10000);
}
}
return prescaler;
@ -304,31 +289,12 @@ STATIC void pyb_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_print_
case TIMER_CFG_A_PERIODIC_UP:
mode_qst = MP_QSTR_PERIODIC;
break;
case TIMER_CFG_A_CAP_COUNT:
mode_qst = MP_QSTR_EDGE_COUNT;
break;
case TIMER_CFG_A_CAP_TIME:
mode_qst = MP_QSTR_EDGE_TIME;
break;
default:
break;
}
mp_printf(print, "Timer(%u, mode=Timer.%q)", (tim->id + 1), mode_qst);
}
/// \method init(mode, *, width)
/// Initialise the timer. Initialisation must give the desired mode
/// and an optional timer width
///
/// tim.init(mode=Timer.ONE_SHOT, width=32) # one shot mode
/// tim.init(mode=Timer.PERIODIC) # configure in free running periodic mode
/// split into two 16-bit independent timers
///
/// Keyword arguments:
///
/// - `width` - specifies the width of the timer. Default is 32 bit mode. When in 16 bit mode
/// the timer is splitted into 2 independent channels.
///
STATIC mp_obj_t pyb_timer_init_helper(pyb_timer_obj_t *tim, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT, },
@ -341,8 +307,7 @@ STATIC mp_obj_t pyb_timer_init_helper(pyb_timer_obj_t *tim, mp_uint_t n_args, co
// check the mode
uint32_t _mode = args[0].u_int;
if (_mode != TIMER_CFG_A_ONE_SHOT_UP && _mode != TIMER_CFG_A_PERIODIC_UP && _mode != TIMER_CFG_A_CAP_COUNT &&
_mode != TIMER_CFG_A_CAP_TIME && _mode != TIMER_CFG_A_PWM) {
if (_mode != TIMER_CFG_A_ONE_SHOT_UP && _mode != TIMER_CFG_A_PERIODIC_UP && _mode != TIMER_CFG_A_PWM) {
goto error;
}
@ -368,11 +333,7 @@ error:
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
}
/// \classmethod \constructor(id, ...)
/// Construct a new timer object of the given id. If additional
/// arguments are given, then the timer is initialised by `init(...)`.
/// `id` can be 1 to 4
STATIC mp_obj_t pyb_timer_make_new(const mp_obj_type_t *type, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
STATIC mp_obj_t pyb_timer_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
@ -395,15 +356,11 @@ STATIC mp_obj_t pyb_timer_make_new(const mp_obj_type_t *type, mp_uint_t n_args,
return (mp_obj_t)tim;
}
// \method init()
/// initializes the timer
STATIC mp_obj_t pyb_timer_init(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
return pyb_timer_init_helper(args[0], n_args - 1, args + 1, kw_args);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_timer_init_obj, 1, pyb_timer_init);
// \method deinit()
/// disables the timer
STATIC mp_obj_t pyb_timer_deinit(mp_obj_t self_in) {
pyb_timer_obj_t *self = self_in;
timer_disable(self);
@ -411,24 +368,6 @@ STATIC mp_obj_t pyb_timer_deinit(mp_obj_t self_in) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_timer_deinit_obj, pyb_timer_deinit);
/// \method channel(channel, *, freq, period, polarity, duty_cycle)
/// Initialise the timer channel. Initialization requires at least a frequency param. With no
/// extra params given besides the channel id, the channel is returned with the previous configuration
/// os 'None', if it hasn't been initialized before.
///
/// tim1.channel(Timer.A, freq=1000) # set channel A frequency to 1KHz
/// tim2.channel(Timer.AB, freq=10) # both channels (because it's a 32 bit timer) combined to create a 10Hz timer
///
/// when initialiazing the channel of a 32-bit timer, channel ID MUST be = Timer.AB
///
/// Keyword arguments:
///
/// - `freq` - specifies the frequency in Hz.
/// - `period` - specifies the period in microseconds.
/// - `polarity` - in PWM specifies the polarity of the pulse. In capture mode specifies the edge to capture.
/// in order to capture on both negative and positive edges, make it = Timer.POSITIVE | Timer.NEGATIVE.
/// - `duty_cycle` - sets the duty cycle value
///
STATIC mp_obj_t pyb_timer_channel(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
@ -490,10 +429,22 @@ STATIC mp_obj_t pyb_timer_channel(mp_uint_t n_args, const mp_obj_t *pos_args, mp
ch->frequency = args[0].u_int;
ch->period = args[1].u_int;
ch->polarity = args[2].u_int;
ch->duty_cycle = MIN(100, MAX(0, args[3].u_int));
ch->duty_cycle = MIN(10000, MAX(0, args[3].u_int));
timer_channel_init(ch);
// assign the pin
if ((ch->timer->config & 0x0F) == TIMER_CFG_A_PWM) {
uint32_t ch_idx = (ch->channel == TIMER_A) ? 0 : 1;
// use the default pin if available
mp_obj_t pin_o = (mp_obj_t)pyb_timer_pwm_pin[(ch->timer->id * 2) + ch_idx];
if (pin_o != MP_OBJ_NULL) {
pin_obj_t *pin = pin_find(pin_o);
pin_config (pin, pin_find_af_index(pin, PIN_FN_TIM, ch->timer->id, PIN_TYPE_TIM_PWM),
0, PIN_TYPE_STD, -1, PIN_STRENGTH_4MA);
}
}
// add the timer to the list
pyb_timer_channel_add(ch);
@ -515,14 +466,11 @@ STATIC const mp_map_elem_t pyb_timer_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_B), MP_OBJ_NEW_SMALL_INT(TIMER_B) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_ONE_SHOT), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_ONE_SHOT_UP) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_PERIODIC), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_PERIODIC_UP) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_EDGE_COUNT), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_CAP_COUNT) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_EDGE_TIME), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_CAP_TIME) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_PWM), MP_OBJ_NEW_SMALL_INT(TIMER_CFG_A_PWM) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_POSITIVE), MP_OBJ_NEW_SMALL_INT(PYBTIMER_POLARITY_POS) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_NEGATIVE), MP_OBJ_NEW_SMALL_INT(PYBTIMER_POLARITY_NEG) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_TIMEOUT), MP_OBJ_NEW_SMALL_INT(PYBTIMER_TIMEOUT_TRIGGER) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_MATCH), MP_OBJ_NEW_SMALL_INT(PYBTIMER_MATCH_TRIGGER) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_EVENT), MP_OBJ_NEW_SMALL_INT(PYBTIMER_EVENT_TRIGGER) },
};
STATIC MP_DEFINE_CONST_DICT(pyb_timer_locals_dict, pyb_timer_locals_dict_table);
@ -610,14 +558,12 @@ STATIC void pyb_timer_channel_print(const mp_print_t *print, mp_obj_t self_in, m
break;
}
if (mode == TIMER_CFG_A_PWM) {
mp_printf(print, ", %q=%u", MP_QSTR_duty_cycle, ch->duty_cycle);
mp_printf(print, ", %q=%u.%02u", MP_QSTR_duty_cycle, ch->duty_cycle / 100, ch->duty_cycle % 100);
}
}
mp_printf(print, ")");
}
/// \method freq([value])
/// get or set the frequency of the timer channel
STATIC mp_obj_t pyb_timer_channel_freq(mp_uint_t n_args, const mp_obj_t *args) {
pyb_timer_channel_obj_t *ch = args[0];
if (n_args == 1) {
@ -637,8 +583,6 @@ STATIC mp_obj_t pyb_timer_channel_freq(mp_uint_t n_args, const mp_obj_t *args) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_timer_channel_freq_obj, 1, 2, pyb_timer_channel_freq);
/// \method period([value])
/// get or set the period of the timer channel in microseconds
STATIC mp_obj_t pyb_timer_channel_period(mp_uint_t n_args, const mp_obj_t *args) {
pyb_timer_channel_obj_t *ch = args[0];
if (n_args == 1) {
@ -658,59 +602,6 @@ STATIC mp_obj_t pyb_timer_channel_period(mp_uint_t n_args, const mp_obj_t *args)
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_timer_channel_period_obj, 1, 2, pyb_timer_channel_period);
/// \method time([value])
/// get or set the value of the timer channel in microseconds
STATIC mp_obj_t pyb_timer_channel_time(mp_uint_t n_args, const mp_obj_t *args) {
pyb_timer_channel_obj_t *ch = args[0];
uint32_t value;
// calculate the period, the prescaler and the match value
uint32_t period_c;
uint32_t match;
(void)compute_prescaler_period_and_match_value(ch, &period_c, &match);
if (n_args == 1) {
// get
value = (ch->channel == TIMER_B) ? HWREG(ch->timer->timer + TIMER_O_TBV) : HWREG(ch->timer->timer + TIMER_O_TAV);
// return the current timer value in microseconds
uint32_t time_t = (1000 * value) / period_c;
return mp_obj_new_int((time_t * 1000) / ch->frequency);
} else {
// set
value = (mp_obj_get_int(args[1]) * ((ch->frequency * period_c) / 1000)) / 1000;
if ((value > 0xFFFF) && (ch->timer->config & TIMER_CFG_SPLIT_PAIR)) {
// this exceeds the maximum value of a 16-bit timer
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
}
// write period minus value since we are always operating in count-down mode
TimerValueSet (ch->timer->timer, ch->channel, (period_c - value));
return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_timer_channel_time_obj, 1, 2, pyb_timer_channel_time);
/// \method event_count()
/// get the number of events triggered by the configured edge
STATIC mp_obj_t pyb_timer_channel_event_count(mp_obj_t self_in) {
pyb_timer_channel_obj_t *ch = self_in;
return mp_obj_new_int(MAP_TimerValueGet(ch->timer->timer, ch->channel == (TIMER_A | TIMER_B) ? TIMER_A : ch->channel));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_timer_channel_event_count_obj, pyb_timer_channel_event_count);
/// \method event_time()
/// get the time at which the last event was triggered
STATIC mp_obj_t pyb_timer_channel_event_time(mp_obj_t self_in) {
pyb_timer_channel_obj_t *ch = self_in;
// calculate the period, the prescaler and the match value
uint32_t period_c;
uint32_t match;
(void)compute_prescaler_period_and_match_value(ch, &period_c, &match);
uint32_t value = MAP_TimerValueGet(ch->timer->timer, ch->channel == (TIMER_A | TIMER_B) ? TIMER_A : ch->channel);
uint32_t time_t = (1000 * value) / period_c;
return mp_obj_new_int((time_t * 1000) / ch->frequency);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_timer_channel_event_time_obj, pyb_timer_channel_event_time);
/// \method duty_cycle()
/// get or set the duty cycle when in PWM mode
STATIC mp_obj_t pyb_timer_channel_duty_cycle(mp_uint_t n_args, const mp_obj_t *args) {
pyb_timer_channel_obj_t *ch = args[0];
if (n_args == 1) {
@ -721,7 +612,7 @@ STATIC mp_obj_t pyb_timer_channel_duty_cycle(mp_uint_t n_args, const mp_obj_t *a
// calculate the period, the prescaler and the match value
uint32_t period_c;
uint32_t match;
ch->duty_cycle = MIN(100, MAX(0, mp_obj_get_int(args[1])));
ch->duty_cycle = MIN(10000, MAX(0, mp_obj_get_int(args[1])));
compute_prescaler_period_and_match_value(ch, &period_c, &match);
if (n_args == 3) {
// set the new polarity if requested
@ -735,7 +626,6 @@ STATIC mp_obj_t pyb_timer_channel_duty_cycle(mp_uint_t n_args, const mp_obj_t *a
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_timer_channel_duty_cycle_obj, 1, 3, pyb_timer_channel_duty_cycle);
/// \method irq(trigger, priority, handler, wake)
STATIC mp_obj_t pyb_timer_channel_irq (mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
mp_arg_val_t args[mp_irq_INIT_NUM_ARGS];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, mp_irq_INIT_NUM_ARGS, mp_irq_init_args, args);
@ -766,18 +656,6 @@ STATIC mp_obj_t pyb_timer_channel_irq (mp_uint_t n_args, const mp_obj_t *pos_arg
goto invalid_args;
}
break;
case TIMER_CFG_A_CAP_COUNT:
ch->timer->irq_trigger |= TIMER_CAPA_MATCH << shift;
if (trigger != PYBTIMER_MATCH_TRIGGER) {
goto invalid_args;
}
break;
case TIMER_CFG_A_CAP_TIME:
ch->timer->irq_trigger |= TIMER_CAPA_EVENT << shift;
if (trigger != PYBTIMER_EVENT_TRIGGER) {
goto invalid_args;
}
break;
case TIMER_CFG_A_PWM:
// special case for the PWM match interrupt
ch->timer->irq_trigger |= ((ch->channel & TIMER_A) == TIMER_A) ? TIMER_TIMA_MATCH : TIMER_TIMB_MATCH;
@ -855,9 +733,6 @@ STATIC const mp_map_elem_t pyb_timer_channel_locals_dict_table[] = {
// instance methods
{ MP_OBJ_NEW_QSTR(MP_QSTR_freq), (mp_obj_t)&pyb_timer_channel_freq_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_period), (mp_obj_t)&pyb_timer_channel_period_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_time), (mp_obj_t)&pyb_timer_channel_time_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_event_count), (mp_obj_t)&pyb_timer_channel_event_count_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_event_time), (mp_obj_t)&pyb_timer_channel_event_time_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_duty_cycle), (mp_obj_t)&pyb_timer_channel_duty_cycle_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_irq), (mp_obj_t)&pyb_timer_channel_irq_obj },
};

6
cc3200/qstrdefsport.h
View File

@ -365,21 +365,15 @@ Q(width)
Q(channel)
Q(polarity)
Q(duty_cycle)
Q(time)
Q(event_count)
Q(event_time)
Q(A)
Q(B)
Q(ONE_SHOT)
Q(PERIODIC)
Q(EDGE_COUNT)
Q(EDGE_TIME)
Q(PWM)
Q(POSITIVE)
Q(NEGATIVE)
Q(TIMEOUT)
Q(MATCH)
Q(EVENT)
// for uhashlib module
//Q(uhashlib)

108
docs/library/machine.Timer.rst
View File

@ -5,11 +5,6 @@ class Timer -- control internal timers
.. only:: port_wipy
.. note::
Contrary with the rest of the API, timer IDs start at 1, not a t zero. This is because
the ``Timer`` API is still provisional. A new MicroPython wide API will come soon.
Timers can be used for a great variety of tasks, calling a function periodically,
counting events, and generating a PWM signal are among the most common use cases.
Each timer consists of 2 16-bit channels and this channels can be tied together to
@ -20,40 +15,39 @@ class Timer -- control internal timers
Example usage to toggle an LED at a fixed frequency::
from machine import Timer
tim = Timer(4) # create a timer object using timer 4
from machine import Pin
led = Pin('GP16', mode=Pin.OUT) # enable GP16 as output to drive the LED
tim = Timer(3) # create a timer object using timer 3
tim.init(mode=Timer.PERIODIC) # initialize it in periodic mode
tim_ch = tim.channel(Timer.A, freq=2) # configure channel A at a frequency of 2Hz
tim_ch.callback(handler=lambda t:led.toggle()) # toggle a LED on every cycle of the timer
tim_ch = tim.channel(Timer.A, freq=5) # configure channel A at a frequency of 5Hz
tim_ch.irq(handler=lambda t:led.toggle()) # toggle a LED on every cycle of the timer
Example using named function for the callback::
from machine import Timer
tim = Timer(1, mode=Timer.PERIODIC)
tim_a = tim.channel(Timer.A, freq=1000)
from machine import Pin
tim = Timer(1, mode=Timer.PERIODIC, width=32)
tim_a = tim.channel(Timer.A | Timer.B, freq=1) # 1 Hz frequency requires a 32 bit timer
led = Pin('GPIO2', mode=Pin.OUT)
led = Pin('GP16', mode=Pin.OUT) # enable GP16 as output to drive the LED
def tick(timer): # we will receive the timer object when being called
print(timer.time()) # show current timer's time value (is microseconds)
led.toggle() # toggle the LED
tim_a.callback(handler=tick)
tim_a.irq(handler=tick) # create the interrupt
Further examples::
from machine import Timer
tim1 = Timer(2, mode=Timer.EVENT_COUNT) # initialize it capture mode
tim2 = Timer(1, mode=Timer.PWM) # initialize it in PWM mode
tim_ch = tim1.channel(Timer.A, freq=1, polarity=Timer.POSITIVE) # start the event counter with a frequency of 1Hz and triggered by positive edges
tim_ch = tim2.channel(Timer.B, freq=10000, duty_cycle=50) # start the PWM on channel B with a 50% duty cycle
tim_ch.time() # get the current time in usec (can also be set)
tim_ch.freq(20) # set the frequency (can also get)
tim_ch.duty_cycle(30) # set the duty cycle to 30% (can also get)
tim_ch.duty_cycle(30, Timer.NEGATIVE) # set the duty cycle to 30% and change the polarity to negative
tim_ch.event_count() # get the number of captured events
tim_ch.event_time() # get the the time of the last captured event
tim_ch.period(2000000) # change the period to 2 seconds
tim1 = Timer(2, mode=Timer.ONE_SHOT) # initialize it in one shot mode
tim2 = Timer(1, mode=Timer.PWM) # initialize it in PWM mode
tim1_ch = tim1.channel(Timer.A, freq=10, polarity=Timer.POSITIVE) # start the event counter with a frequency of 10Hz and triggered by positive edges
tim2_ch = tim2.channel(Timer.B, freq=10000, duty_cycle=50) # start the PWM on channel B with a 50% duty cycle
tim2_ch.freq(20) # set the frequency (can also get)
tim2_ch.duty_cycle(30) # set the duty cycle to 30% (can also get)
tim2_ch.duty_cycle(30, Timer.NEGATIVE) # set the duty cycle to 30% and change the polarity to negative
tim2_ch.period(2000000) # change the period to 2 seconds
.. note::
@ -69,9 +63,7 @@ Constructors
.. only:: port_wipy
Construct a new timer object of the given id. If additional
arguments are given, then the timer is initialised by ``init(...)``.
``id`` can be 1 to 4.
Construct a new timer object of the given id. ``id`` can take values from 0 to 3.
Methods
@ -94,10 +86,9 @@ Methods
period of the channel expires.
- ``Timer.PERIODIC`` - The timer runs periodically at the configured
frequency of the channel.
- ``Timer.EDGE_TIME`` - Meaure the time pin level changes.
- ``Timer.EDGE_COUNT`` - Count the number of pin level changes.
- ``Timer.PWM`` - Output a PWM signal on a pin.
- ``width`` must be either 16 or 32 (bits). For really low frequencies <= ~1Hz
- ``width`` must be either 16 or 32 (bits). For really low frequencies < 5Hz
(or large periods), 32-bit timers should be used. 32-bit mode is only available
for ``ONE_SHOT`` AND ``PERIODIC`` modes.
@ -112,7 +103,7 @@ Methods
If only a channel identifier passed, then a previously initialized channel
object is returned (or ``None`` if there is no previous channel).
Othwerwise, a TimerChannel object is initialized and returned.
The operating mode is is the one configured to the Timer object that was used to
@ -130,12 +121,11 @@ Methods
Either ``freq`` or ``period`` must be given, never both.
- ``polarity`` this is applicable for:
- ``PWM``, defines the polarity of the duty cycle
- ``EDGE_TIME`` and ``EDGE_COUNT``, defines the polarity of the pin level change to detect.
To detect both rising and falling edges, make ``polarity=Timer.POSITIVE | Timer.NEGATIVE``.
- ``duty_cycle`` only applicable to ``PWM``. It's a percentage (0-100)
- ``polarity`` this is applicable for ``PWM``, and defines the polarity of the duty cycle
- ``duty_cycle`` only applicable to ``PWM``. It's a percentage (0.00-100.00). Since the WiPy
doesn't support floating point numbers the duty cycle must be specified in the range 0-10000,
where 10000 would represent 100.00, 5050 represents 50.50, and so on.
class TimerChannel --- setup a channel for a timer
==================================================
@ -166,31 +156,47 @@ Methods
- ``priority`` level of the interrupt. Can take values in the range 1-7.
Higher values represent higher priorities.
- ``handler`` is an optional function to be called when the interrupt is triggered.
- ``trigger`` must be ``Timer.TIMEOUT`` when the operating mode is either ``Timer.PERIODIC`` or
``Timer.ONE_SHOT``. In the case that mode is ``Timer.PWM`` then trigger must be equal to
``Timer.MATCH``.
Returns a callback object.
.. only:: port_wipy
.. method:: timerchannel.freq([value])
Get or set the timer channel frequency (in Hz).
.. method:: timerchannel.period([value])
Get or set the timer channel period (in microseconds).
.. method:: timerchannel.time([value])
Get or set the timer channel current **time** value (in microseconds).
.. method:: timerchannel.event_count()
Get the number of edge events counted.
.. method:: timerchannel.event_time()
Get the time of ocurrance of the last event.
.. method:: timerchannel.duty_cycle([value])
Get or set the duty cycle of the PWM signal (in the range of 0-100).
Constants
---------
.. data:: Timer.ONE_SHOT
.. data:: Timer.PERIODIC
.. data:: Timer.PWM
Selects the timer operating mode.
.. data:: Timer.A
.. data:: Timer.B
Selects the timer channel. Must be ORed (``Timer.A`` | ``Timer.B``) when
using a 32-bit timer.
.. data:: Timer.POSITIVE
.. data:: Timer.NEGATIVE
Timer channel polarity selection (only relevant in PWM mode).
.. data:: Timer.TIMEOUT
.. data:: Timer.MATCH
Timer channel IRQ triggers.

4
docs/wipy/quickref.rst
View File

@ -49,10 +49,10 @@ See :ref:`machine.Timer <machine.Timer>` and :ref:`machine.Pin <machine.Pin>`. :
from machine import Timer
from machine import Pin
tim = Timer(1, mode=Timer.PERIODIC)
tim = Timer(0, mode=Timer.PERIODIC)
tim_a = tim.channel(Timer.A, freq=1000)
tim_a.time() # get the value in microseconds
tim_a.freq(1) # 1 Hz
tim_a.freq(5) # 5 Hz
p_out = Pin('GP2', mode=Pin.OUT)
tim_a.irq(handler=lambda t: p_out.toggle())