EPD_hardware_driver.h File Reference

The SPI, PWM, Temperature definitions of COG hardware driver.

Copyright (c) 2012-2014 Pervasive Displays Inc. All rights reserved.

#include "Pervasive_Displays_small_EPD.h"

Functions
void	EPD_display_hardware_init (void)
	Initialize the EPD hardware setting. More...
void	epd_spi_attach (void)
	Initialize SPI. More...
void	epd_spi_detach (void)
	Disable SPI and change to GPIO. More...
void	epd_spi_init (void)
	Configure SPI. More...
uint8_t	epd_spi_read (unsigned char RDATA)
	SPI synchronous read. More...
void	epd_spi_send (unsigned char Register, unsigned char *Data, unsigned Length)
	SPI command if register data is larger than two bytes. More...
void	epd_spi_send_byte (uint8_t Register, uint8_t Data)
	SPI command. More...
void	epd_spi_write (unsigned char Data)
	Send data to SPI. More...
uint32_t	get_current_time_tick (void)
	Get current Timer after starting a new one. More...
int16_t	get_temperature (void)
	Get temperature value from ADC. More...
void	initialize_temperature (void)
	Initialize the temperature sensor. More...
void	PWM_run (uint16_t time)
	PWM toggling. More...
void	PWM_start_toggle (void)
	The PWM signal starts toggling. More...
void	PWM_stop_toggle (void)
	The PWM signal stops toggling. More...
void	start_EPD_timer (void)
	Start Timer. More...
void	stop_EPD_timer (void)
	Stop Timer. More...
void	sys_delay_ms (unsigned int ms)
	Delay mini-seconds. More...
void	SysTick_Handler (void)
	Interrupt Service Routine for system tick counter. More...

void EPD_display_hardware_init

(

void

)

Initialize the EPD hardware setting.

References EPD_border_low(), EPD_cs_low(), EPD_discharge_low(), EPD_initialize_gpio(), EPD_pwm_low(), EPD_rst_low(), epd_spi_init(), EPD_Vcc_turn_off(), and initialize_temperature().

void epd_spi_attach

(

void

)

Initialize SPI.

References EPD_cs_high(), EPD_flash_cs_high(), and epd_spi_init().

void epd_spi_detach

(

void

)

Disable SPI and change to GPIO.

References config_gpio_dir_o, ioport_enable_pin(), set_gpio_low, and spi_disable().

void epd_spi_init

(

void

)

Configure SPI.

References delay_ms, gpio_configure_pin, IOPORT_DIR_OUTPUT, ioport_disable_pin(), IOPORT_INIT_HIGH, spi_enable(), spi_master_init(), spi_master_setup_device(), SPI_MODE_0, and sysclk_enable_peripheral_clock().

Referenced by EPD_display_hardware_init(), and epd_spi_attach().

uint8_t epd_spi_read

(

unsigned char

RDATA

)

SPI synchronous read.

Parameters

RDATA

The data to be read

References spi_is_rx_full(), and spi_write_single().

void epd_spi_send	(	unsigned char	register_index,
		unsigned char *	register_data,
		unsigned	length
	)

SPI command if register data is larger than two bytes.

Parameters

register_index	The Register Index as SPI command to COG
register_data	The Register Data for sending command data to COG
length	The number of bytes of Register Data which depends on which Register Index is selected.

References EPD_cs_high(), EPD_cs_low(), epd_spi_write(), and Wait_10us().

void epd_spi_send_byte	(	uint8_t	register_index,
		uint8_t	register_data
	)

SPI command.

Parameters

register_index	The Register Index as SPI command to COG
register_data	The Register Data for sending command data to COG

References EPD_cs_high(), EPD_cs_low(), epd_spi_write(), and Wait_10us().

void epd_spi_write

(

unsigned char

Data

)

Send data to SPI.

Parameters

data	The data to be sent out

References spi_is_tx_empty(), and spi_write_single().

Referenced by epd_spi_send(), and epd_spi_send_byte().

uint32_t get_current_time_tick

(

void

)

Get current Timer after starting a new one.

References EPD_Counter.

int16_t get_temperature

(

void

)

Get temperature value from ADC.

Returns

the Celsius temperature

not used at present

References adc_disable(), adc_enable(), F_CPU, g_adc_inst, get_ADC_value(), NUM_SAMPLES, sysclk_disable_peripheral_clock(), and sysclk_enable_peripheral_clock().

void initialize_temperature

(

void

)

Initialize the temperature sensor.

not used at present

References adc_enable(), adc_init(), adcife_read_conv_result(), and g_adc_inst.

Referenced by EPD_display_hardware_init().

void PWM_run

(

uint16_t

ms

)

PWM toggling.

Parameters

ms	The interval of PWM toggling (mini seconds)

References delay_ms, PWM_start_toggle(), and PWM_stop_toggle().

void PWM_start_toggle

(

void

)

The PWM signal starts toggling.

Configure the PMC to enable the Timer/Counter (TC) module.

TC Configuration structure.

TC Compare Output Mode

TC Waveform Generation Mode

TC Clock Selection, Prescalar select

Init TC to waveform mode.

Configure waveform frequency and duty cycle.

Enable TC EPD_TC_WAVEFORM_CHANNEL.

References tc_control_reg::co_mode, CO_SET, gpio_configure_pin, PWM_Mode11, sysclk_enable_peripheral_clock(), sysclk_get_peripheral_bus_hz(), tc_clear_cc(), tc_clear_ic(), tc_initc(), tc_start(), tc_write_cc(), and tc_write_ic().

Referenced by PWM_run().

void PWM_stop_toggle

(

void

)

The PWM signal stops toggling.

References tc_stop().

Referenced by PWM_run().

void start_EPD_timer

(

void

)

Start Timer.

References initialize_EPD_timer().

Referenced by sys_delay_ms().

void stop_EPD_timer

(

void

)

Stop Timer.

References tc_stop().

Referenced by sys_delay_ms().

void sys_delay_ms

(

unsigned int

ms

)

Delay mini-seconds.

Parameters

ms	The number of mini-seconds

References EPD_Counter, start_EPD_timer(), and stop_EPD_timer().

void SysTick_Handler

(

void

)

Interrupt Service Routine for system tick counter.

References EPD_Counter.