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Refactored MDx backlight driver

This commit is contained in:
Silvano Seva 2023-07-13 17:25:47 +02:00
parent 313e9615a6
commit 163a3df607
2 changed files with 53 additions and 87 deletions
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111
platform/drivers/backlight/backlight_MDx.c
View File

@ -23,10 +23,37 @@
#include <hwconfig.h>
#include "backlight.h"
#ifndef PLATFORM_MDUV3x0 /* MD-3x0 and MD-9600 */
#if defined(PLATFORM_MDUV3x0) && defined(ENABLE_BKLIGHT_DIMMING)
/*
* Interrupt-based software PWM for backlight dimming on MD-UV3x0.
* On this family of devices the GPIO for backlight control is not connected to
* any of the available timer compare output channels, thus making impossible to
* implement an hardware-based PWM.
* However, we provide a software-base backlight dimming for experimental purposes.
*/
/* Name of interrupt handler is mangled for C++ compatibility */
void _Z29TIM1_TRG_COM_TIM11_IRQHandlerv()
{
if(TIM11->SR & TIM_SR_CC1IF)
{
gpio_clearPin(LCD_BKLIGHT); /* Clear pin on compare match */
}
if(TIM11->SR & TIM_SR_UIF)
{
gpio_setPin(LCD_BKLIGHT); /* Set pin on counter reload */
}
TIM11->SR = 0;
}
#endif
void backlight_init()
{
#ifndef PLATFORM_MDUV3x0 /* MD-3x0 and MD-9600 */
gpio_setMode(LCD_BKLIGHT, ALTERNATE);
gpio_setAlternateFunction(LCD_BKLIGHT, 3);
@ -52,61 +79,11 @@ void backlight_init()
TIM8->CCR1 = 0;
TIM8->EGR = TIM_EGR_UG; /* Update registers */
TIM8->CR1 |= TIM_CR1_CEN; /* Start timer */
}
void backlight_terminate()
{
/* Shut down backlight */
gpio_setMode(LCD_BKLIGHT, OUTPUT);
gpio_clearPin(LCD_BKLIGHT);
/* Shut down timer */
RCC->APB2ENR &= ~RCC_APB2ENR_TIM8EN;
__DSB();
}
/*
* This function is defined in platform.h
*/
void platform_setBacklightLevel(uint8_t level)
{
if(level > 100) level = 100;
// Convert value to 0 - 255
TIM8->CCR1 = (2 * level) + (level * 55)/100;
}
#elif defined(ENABLE_BKLIGHT_DIMMING) /* MD-UV3x0 AND dimming enabled */
/*
* Interrupt-based software PWM for backlight dimming on MD-UV3x0.
* On this family of devices the GPIO for backlight control is not connected to
* any of the available timer compare output channels, thus making impossible to
* implement an hardware-based PWM.
* However, we provide a software-base backlight dimming for experimental purposes.
*/
/* Name of interrupt handler is mangled for C++ compatibility */
void _Z29TIM1_TRG_COM_TIM11_IRQHandlerv()
{
if(TIM11->SR & TIM_SR_CC1IF)
{
gpio_clearPin(LCD_BKLIGHT); /* Clear pin on compare match */
}
if(TIM11->SR & TIM_SR_UIF)
{
gpio_setPin(LCD_BKLIGHT); /* Set pin on counter reload */
}
TIM11->SR = 0;
}
void backlight_init()
{
#else
gpio_setMode(LCD_BKLIGHT, OUTPUT);
gpio_clearPin(LCD_BKLIGHT);
#ifdef ENABLE_BKLIGHT_DIMMING
/*
* Configure TIM11 for backlight PWM: Fpwm = 256Hz, 8 bit of resolution.
* APB2 freq. is 84MHz but timer runs at twice this frequency, then:
@ -134,14 +111,18 @@ void backlight_init()
NVIC_ClearPendingIRQ(TIM1_TRG_COM_TIM11_IRQn);
NVIC_SetPriority(TIM1_TRG_COM_TIM11_IRQn,15);
NVIC_EnableIRQ(TIM1_TRG_COM_TIM11_IRQn);
#endif
#endif
}
void backlight_terminate()
{
/* Shut down backlight */
gpio_setMode(LCD_BKLIGHT, OUTPUT);
gpio_clearPin(LCD_BKLIGHT);
/* Shut down timer */
RCC->APB2ENR &= ~RCC_APB2ENR_TIM8EN;
RCC->APB2ENR &= ~RCC_APB2ENR_TIM11EN;
__DSB();
}
@ -151,23 +132,31 @@ void backlight_terminate()
*/
void platform_setBacklightLevel(uint8_t level)
{
if(level > 100)
level = 100;
uint8_t pwmLevel = (2 * level) + (level * 55)/100; // Convert value to 0 - 255
#ifndef PLATFORM_MDUV3x0
TIM8->CCR1 = pwmLevel;
#else
/*
* Little workaround for the following nasty behaviour: if CCR1 value is
* zero, a waveform with 99% duty cycle is generated. This is because we are
* emulating pwm with interrupts.
* If CCR1 value is zero, a waveform with 99% duty cycle is generated: to
* avoid this the PWM is cut off when backlight level is 1.
*/
if(level > 1)
{
if(level > 100) level = 100;
TIM11->CCR1 = (2 * level) + (level * 55)/100;
#ifdef ENABLE_BKLIGHT_DIMMING
TIM11->CCR1 = pwmLevel;
TIM11->CR1 |= TIM_CR1_CEN;
#else
gpio_setPin(LCD_BKLIGHT);
#endif
}
else
{
TIM11->CR1 &= ~TIM_CR1_CEN;
gpio_clearPin(LCD_BKLIGHT);
}
}
#endif
}

29
platform/targets/MD-UV3x0/platform.c
View File

@ -66,23 +66,13 @@ void platform_init()
rtc_init(); /* Initialise RTC */
chSelector_init(); /* Initialise channel selector handler */
audio_init(); /* Initialise audio management module */
#ifdef ENABLE_BKLIGHT_DIMMING
backlight_init(); /* Initialise backlight driver */
#else
gpio_setMode(LCD_BKLIGHT, OUTPUT);
gpio_clearPin(LCD_BKLIGHT);
#endif
}
void platform_terminate()
{
/* Shut down backlight */
#ifdef ENABLE_BKLIGHT_DIMMING
backlight_terminate();
#else
gpio_clearPin(LCD_BKLIGHT);
#endif
/* Shut down LEDs */
gpio_clearPin(GREEN_LED);
@ -212,20 +202,7 @@ const hwInfo_t *platform_getHwInfo()
// int8_t platform_getChSelector()
/*
* NOTE: when backligth dimming is enabled, the implementation of this API
* function is provided in platform/drivers/backlight/backlight_MDx.c to avoid
* an useless function call.
* NOTE: implementation of this API function is provided in
* platform/drivers/backlight/backlight_MDx.c
*/
#ifndef ENABLE_BKLIGHT_DIMMING
void platform_setBacklightLevel(uint8_t level)
{
if(level > 1)
{
gpio_setPin(LCD_BKLIGHT);
}
else
{
gpio_clearPin(LCD_BKLIGHT);
}
}
#endif
// void platform_setBacklightLevel(uint8_t level)