Commit ec6e2d16 authored by Manuel Kasten's avatar Manuel Kasten Committed by schneider
Browse files

control display backlight brightness (epic part)

parent 9f9fd2a9
......@@ -53,6 +53,7 @@ typedef _Bool bool;
#define API_DISP_CIRC 0x27
#define API_DISP_PIXEL 0x28
#define API_DISP_FRAMEBUFFER 0x29
#define API_DISP_BACKLIGHT 0x2a
/* API_BATTERY_VOLTAGE 0x30 */
#define API_BATTERY_CURRENT 0x31
......@@ -1333,6 +1334,17 @@ API(API_DISP_CIRC,
API(API_DISP_FRAMEBUFFER, int epic_disp_framebuffer(union disp_framebuffer *fb));
/**
* Set the backlight brightness value
*
* :param brightness: brightness from 0 - 1000
* :return: ``0`` on success or negative value in case of an error:
*
* - ``-EBUSY``: Display was already locked from another task.
*/
API(API_DISP_BACKLIGHT, int epic_disp_backlight(uint16_t brightness));
/**
* Start continuous readout of the light sensor. Will read light level
* at preconfigured interval and make it available via `epic_light_sensor_get()`.
......
......@@ -171,6 +171,17 @@ int epic_disp_framebuffer(union disp_framebuffer *fb)
return 0;
}
int epic_disp_backlight(uint16_t brightness)
{
int cl = check_lock();
if (cl < 0) {
return cl;
}
LCD_SetBacklight(brightness);
return 0;
}
int epic_disp_open()
{
TaskHandle_t task = xTaskGetCurrentTaskHandle();
......
......@@ -4,77 +4,19 @@
#include "textbuffer.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 };
struct gfx_region display_screen;
struct txt_buffer display_textb;
// 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");
}
void display_set_reset_pin(uint8_t state)
{
if (!portexpander_detected()) {
......@@ -95,8 +37,7 @@ void display_init(void)
GPIO_Config(&DEV_DC_PIN);
PWM_Output();
LCD_SetBacklight(500);
LCD_SetBacklight(200);
LCD_Init();
display_screen = gfx_screen(LCD_framebuffer());
......
......@@ -58,3 +58,58 @@ void lcd_write(uint8_t *data, int 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");
}
......@@ -34,6 +34,7 @@
#include "Debug.h"
#include "spi.h"
#include "tmr.h"
#include "tmr_utils.h"
#include <stdint.h>
#include <stdio.h>
......@@ -72,7 +73,7 @@ void display_set_reset_pin(uint8_t state);
**/
//#define DEV_Set_BL(_Value) DEV_BL_PIN= _Value
#define DEV_Set_BL(_Value)
void DEV_Set_BL(uint16_t _Value);
/*-----------------------------------------------------------------------------*/
#endif
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