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30 results

DEV_Config.c

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  • Forked from card10 / firmware
    1122 commits behind the upstream repository.
    draradech's avatar
    Manuel Kasten authored and schneider committed
    ec6e2d16
    History
    DEV_Config.c 3.94 KiB
    /*****************************************************************************
    * | File        :   DEV_Config.c
    * | Author      :   Waveshare team
    * | Function    :   Hardware underlying interface
    * | Info        :
    *                Used to shield the underlying layers of each master 
    *                and enhance portability
    *----------------
    * | This version:   V1.0
    * | Date        :   2018-11-22
    * | Info        :
    
    # Permission is hereby granted, free of charge, to any person obtaining a copy
    # of this software and associated documnetation files (the "Software"), to deal
    # in the Software without restriction, including without limitation the rights
    # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    # copies of the Software, and to permit persons to  whom the Software is
    # furished to do so, subject to the following conditions:
    #
    # The above copyright notice and this permission notice shall be included in
    # all copies or substantial portions of the Software.
    #
    # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    # FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    # LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    # THE SOFTWARE.
    #
    ******************************************************************************/
    #include "DEV_Config.h"
    #include "spi.h"
    
    #define SPI SPI2
    
    //const gpio_cfg_t DEV_CS_PIN = {PORT_0, PIN_8, GPIO_FUNC_OUT, GPIO_PAD_NONE};
    //const gpio_cfg_t DEV_BL_PIN = {PORT_0, PIN_8, GPIO_FUNC_OUT, GPIO_PAD_NONE};
    static spi_req_t req = {.rx_data = NULL, .bits=8, .width = SPI17Y_WIDTH_1, .ssel = 0, .deass = 1, .ssel_pol = SPI17Y_POL_LOW, .tx_num = 0, .rx_num = 0};
    #define SPI_SPEED (15 * 1000 * 1000) // Bit Rate. Display has 15 MHz limit
    
    /********************************************************************************/
    void lcd_write(uint8_t *data, int size)
    {
        sys_cfg_spi_t spi17y_master_cfg;
    
        spi17y_master_cfg.map = MAP_A;
        spi17y_master_cfg.ss0 = Enable;
        spi17y_master_cfg.ss1 = Disable;
        spi17y_master_cfg.ss2 = Disable;
        if (SPI_Init(SPI2, 0, SPI_SPEED, spi17y_master_cfg) != 0) {
            printf("Error configuring SPI\n");
            while (1)
                ;
        }
        req.tx_data = data;
        req.len = size;
        SPI_MasterTrans(SPI, &req);
    }
    
    // Parameters for PWM output
    #define PORT_PWM PORT_0 // port
    #define PIN_PWM PIN_28  // pin
    #define FREQ 200        // (Hz)
    #define PWM_TIMER MXC_TMR4 // must change PORT_PWM and PIN_PWM if changed
    void DEV_Set_BL(uint16_t _Value)
    {
    	// 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 * _Value / 1000;
    
    	// 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");
    }