Skip to content
Snippets Groups Projects
Select Git revision
  • ca3aaa55ef0d745e0b239db1a1f183bbe409627c
  • master default protected
  • bme680_demoapp
  • bme680
  • rahix/simple_menu
  • genofire/ble-rewrite
  • rahix/batt
  • schneider/bonding2
  • renze/safe_mode
  • renze/hatchery_apps
  • schneider/fundamental-test
  • koalo/factory-reset
  • ios-workarounds
  • msgctl/gfx_rle
  • msgctl/faultscreen
  • msgctl/textbuffer_api
  • schneider/bonding
  • schneider/bootloader-update-9a0d158
  • schneider/bsec
  • rahix/bma
  • rahix/bhi
  • v1.1
  • v1.0
  • release-1
  • bootloader-v1
  • v0.0
26 results

display.c

Blame
  • Forked from card10 / firmware
    Source project has a limited visibility.
    display.c 2.22 KiB
    #include "LCD/LCD_Driver.h"
    #include "GUI_DEV/GUI_Paint.h"
    
    #include "gpio.h"
    #include "tmr.h"
    #include "portexpander.h"
    #include "MAX77650-Arduino-Library.h"
    
    #include <stdint.h>
    #include <stdio.h>
    /***** Globals *****/
    const gpio_cfg_t DEV_DC_PIN = { PORT_1, PIN_6, GPIO_FUNC_OUT, GPIO_PAD_NONE };
    
    // Parameters for PWM output
    #define PORT_PWM PORT_0 // port
    #define PIN_PWM PIN_28  // pin
    #define FREQ 200        // (Hz)
    //#define DUTY_CYCLE 75  // (%)
    #define DUTY_CYCLE 20      // (%)
    #define PWM_TIMER MXC_TMR4 // must change PORT_PWM and PIN_PWM if changed
    
    /***** Functions *****/
    void PWM_Output(void)
    {
    	// Declare variables
    	gpio_cfg_t gpio_pwm;   // to configure GPIO
    	tmr_cfg_t tmr;         // to congigure timer
    	tmr_pwm_cfg_t tmr_pwm; // for configure PWM
    	unsigned int period_ticks = PeripheralClock / FREQ;
    	unsigned int duty_ticks   = period_ticks * DUTY_CYCLE / 100;
    
    	// Congfigure GPIO port and pin for PWM
    	gpio_pwm.func = GPIO_FUNC_ALT4;
    	gpio_pwm.port = PORT_PWM;
    	gpio_pwm.mask = PIN_PWM;
    	gpio_pwm.pad  = GPIO_PAD_PULL_DOWN;
    
    	if (GPIO_Config(&gpio_pwm) != E_NO_ERROR) {
    		printf("Failed GPIO_Config for pwm.\n");
    	}
    
    	/* 
        Steps for configuring a timer for PWM mode:
        1. Disable the timer
        2. Set the prescale value
        3. Configure the timer for PWM mode
        4. Set polarity, pwm parameters
        5. Enable Timer
        */
    
    	TMR_Disable(PWM_TIMER);
    
    	TMR_Init(PWM_TIMER, TMR_PRES_1, 0);
    
    	tmr.mode    = TMR_MODE_PWM;
    	tmr.cmp_cnt = period_ticks;
    	tmr.pol     = 0;
    	TMR_Config(PWM_TIMER, &tmr);
    
    	tmr_pwm.pol      = 1;
    	tmr_pwm.per_cnt  = period_ticks;
    	tmr_pwm.duty_cnt = duty_ticks;
    
    	if (TMR_PWMConfig(PWM_TIMER, &tmr_pwm) != E_NO_ERROR) {
    		printf("Failed TMR_PWMConfig.\n");
    	}
    
    	TMR_Enable(PWM_TIMER);
    
    	printf("PWM started.\n");