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[development tutorial 11] crazy shell arm function mobile phone timer experimental tutorial

2022-07-27 23:56:00 【efans_ Mike】

ARM Feature phone
—— Crazy shell · Development board series
Timer experiment tutorial

chart 1


8LED Hardware circuit

There is a controllable in the board LED, Connect to DA14580 Of P24 Pin ,LED Series connection 1K Current limiting resistance of , As shown in the figure below ：


chart 2

In the second quarter Timer register

2.1 Timer Introduce

The software timer module contains two timer modules , They can be controlled by software 、 Programmed and used for various tasks .
2.1.1 Timer0

Timer 0 Yes 16 Bit Universal timer ; It can generate two PWM signals ; Programmable output frequency ; Programmable duty cycle ; Programmable software interrupts .
2.1.2 Timer2

Timer 2 Yes 14 Bit Universal timer ; Can produce 3 Channel PWM signal ; The input clock frequency is 16MHz; Programmable input frequency ; Adjustable duty cycle ; For white LED Brightness control .

2.2 Register introduction
2.2.1 Timer 0 Control register


chart 3
15:4 position ： Keep unused ;
3 position ：PWM Mode selection ,’0’ Express PWM Output when the signal is high ’1’,’1’ Express PWM When the signal is high, it outputs the bisection of the fast clock signal , Then the output frequency range is 1~8MHz;
2 position ： Timer 0 Clock frequency division of , by ’1’ Use the selected clock source frequency , by ’0’ Use the selected clock source 10 frequency division , Note that this value applies to the count register ;
1 position ： Clock source selection ,’1’ Use a fast clock （16、8、4、2MHz）,’0’ Use a slow clock （32KHz）;
0 position ： Timer 0 Control bits ,’0’ Indicates a timer 0 Close and reset ,’1’ Timer 0 function .

2.2.2 Timer 0 Count control register


chart 4
Timer 0 Count reload values , If this register is read, the value of the current counter is returned .
2.2.3 Timer 0 High level reload value


chart 5
Timer 0 High level reload value , If this register is read, the timer is returned 0 The count of .
2.2.4 Timer 0 Low level reload value


chart 6
Timer 0 Low level reload value , If this register is read, the timer is returned 0 The count of .
2.2.5 PWM2 Duty cycle


chart 7
PWM2 Duty cycle of the signal .
2.2.6 PWM3 Duty cycle


chart 8
PWM3 Duty cycle of the signal .
2.2.7 PWM4 Duty cycle


chart 9
PWM4 Duty cycle of the signal .
2.2.8 PWM2,3,4 The frequency of


chart 10
PWM2、3、4 The frequency of the signal , The three signals have the same frequency .

2.2.9 PWM2,3,4 Control register


chart 11
2 position ： Hardware pause enable , by ’1’ Then the hardware can stop PWM2、3、4.
1 position ： Software pause enable , by ’1’ be PWM2、3、4 Pause .
0 position ：PWM Signal enable , by ’1’ be PWM2、3、4 Can make .

2.3 Explanation of register configuration
#define CLK_PER_REG (* ( volatile uint16*)0x50000004)
#define TIMER0_CTRL_REG (* ( volatile uint16*)0x50003400)
#define TIMER0_ON_REG (* ( volatile uint16*)0x50003402)
#define TIMER0_RELOAD_M_REG (* ( volatile uint16*)0x50003404)
#define TIMER0_RELOAD_N_REG (* ( volatile uint16*)0x50003406)
#define PWM2_DUTY_CYCLE (* ( volatile uint16*)0x50003408)
#define PWM3_DUTY_CYCLE (* ( volatile uint16*)0x5000340A)
#define PWM4_DUTY_CYCLE (* ( volatile uint16*)0x5000340C)
#define TRIPLE_PWM_FREQUENCY (* ( volatile uint16*)0x5000340E)
#define TRIPLE_PWM_CTRL_REG (* ( volatile uint16*)0x50003410)
start-up Timer0 Module clock ：CLK_PER_REG |= 0x0008;
Timer 0 initialization , Select high frequency clock , normal PWM Pattern , No frequency division , be TIMER0_CTRL_REG = 0X0E;
Set the count value to 1000, The high level is 500, The low level is 200, be TIMER0_ON_REG=1000; TIMER0_RELOAD_M_REG=500; TIMER0_RELOAD_N_REG=200;
On timer interrupt NVIC_SetPriority (SWTIM_IRQn, 254); NVIC_EnableIRQ(SWTIM_IRQn);
Start timer TIMER0_CTRL_REG = (TIMER0_CTRL_REG|0x01);



In the third quarter Timer experiment

The modules used in the experiment are ： Bottom plate of mobile phone development board ,Jlink Debugging tools , DuPont line 、3.7V Lithium battery or Mocro USB Line .
Use JLINK Connect the mobile phone through DuPont line. Bluetooth is located on the main control backplane of the mobile phone , The connection is as follows ：
(1)JLINK One end only needs to be connected with DuPont wire JLINK Of SWC、SWD、GND Three pins , As shown in the figure below ：


chart 12
(2) The Bluetooth end of the mobile phone needs to use DuPont cable to connect the upper right J3 Three pins , And JLINK The connecting pins of the correspond one by one , Respectively SWC-->SWCLK、SWD-->SWDIO、GND-->GND, As shown in the figure below ：


chart 13
take JLINK Plug in the computer USB Interface , After connecting, power the main control board of the mobile phone , For detailed introduction, please refer to 《 How to power on 》 course , Path is ：..\WT_Mobile\0. So let's start here \0. Power on test .
Open the timer to experiment Keil engineering timer0_general.uvproj, Located in the directory ：
..\WT_Mobile\1. Junior course \DA14580\3_ primary _ Timer \projects\target_apps\peripheral_examples\timer0\timer0_general\Keil_5. As shown in the figure below ：


chart 14
Use the bracelet to debug and connect the download cable Jlink, compile , Click on DEBUG, Then click Run at full speed , You can see blue LED flashing , As shown in the figure below ：