1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
#include "gd32f30x.h"
#include <stdio.h>
#include "gd32f307c_eval.h"
void gpio_config(void);
void timer_config(void);
/*!
\brief configure the GPIO ports
\param[in] none
\param[out] none
\retval none
*/
void gpio_config(void)
{
rcu_periph_clock_enable(RCU_GPIOA);
rcu_periph_clock_enable(RCU_GPIOB);
rcu_periph_clock_enable(RCU_AF);
/*configure PA8(TIMER0 CH0) as alternate function*/
gpio_init(GPIOA,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_8);
/*configure PB13(TIMER0 CH0N) as alternate function*/
gpio_init(GPIOB,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_13);
/*configure PB12(TIMER0 BKIN) as alternate function*/
gpio_init(GPIOB,GPIO_MODE_IN_FLOATING,GPIO_OSPEED_50MHZ,GPIO_PIN_12);
}
void timer_config(void)
{
/* -----------------------------------------------------------------------
TIMER0 configuration:
generate 1 complementary PWM signal.
TIMER0CLK is fixed to systemcoreclock, the TIMER0 prescaler is equal to 120 so the
TIMER0 counter clock used is 1MHz.
the duty cycle is computed as the following description:
the channel 0 duty cycle is set to 25% so channel 0N is set to 75%.
insert a dead time equal to ((32+31)*16*4)/systemcoreclock = 33.6us
configure the break feature, active at high level, and using the automatic
output enable feature.
use the locking parameters level1.
----------------------------------------------------------------------- */
timer_oc_parameter_struct timer_ocintpara;
timer_parameter_struct timer_initpara;
timer_break_parameter_struct timer_breakpara;
rcu_periph_clock_enable(RCU_TIMER0);
timer_deinit(TIMER0);
/* TIMER0 configuration */
timer_initpara.prescaler = 119;
timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection = TIMER_COUNTER_UP;
timer_initpara.period = 1599;
timer_initpara.clockdivision = TIMER_CKDIV_DIV4;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER0,&timer_initpara);
/* CH0/CH0N configuration in PWM mode0 */
timer_ocintpara.outputstate = TIMER_CCX_ENABLE;
timer_ocintpara.outputnstate = TIMER_CCXN_ENABLE;
timer_ocintpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
timer_ocintpara.ocnpolarity = TIMER_OCN_POLARITY_HIGH;
timer_ocintpara.ocidlestate = TIMER_OC_IDLE_STATE_HIGH;
timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;
timer_channel_output_config(TIMER0,TIMER_CH_0,&timer_ocintpara);
timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_0,399);
timer_channel_output_mode_config(TIMER0,TIMER_CH_0,TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER0,TIMER_CH_0,TIMER_OC_SHADOW_DISABLE);
/* automatic output enable, break, dead time and lock configuration*/
timer_breakpara.runoffstate = TIMER_ROS_STATE_DISABLE;
timer_breakpara.ideloffstate = TIMER_IOS_STATE_DISABLE ;
timer_breakpara.deadtime = 255;
timer_breakpara.breakpolarity = TIMER_BREAK_POLARITY_LOW;
timer_breakpara.outputautostate = TIMER_OUTAUTO_ENABLE;
timer_breakpara.protectmode = TIMER_CCHP_PROT_0;
timer_breakpara.breakstate = TIMER_BREAK_ENABLE;
timer_break_config(TIMER0,&timer_breakpara);
/* TIMER0 primary output function enable */
timer_primary_output_config(TIMER0,ENABLE);
/* auto-reload preload enable */
timer_auto_reload_shadow_enable(TIMER0);
/* TIMER0 counter enable */
timer_enable(TIMER0);
}
int main(void)
{
gpio_config();
timer_config();
while (1);
}
|