//*****************************************************************************
//*****************************************************************************
void init_lcd_gpio(void)
{
gpio_enable_port(LCD_GPIO_BASE);
gpio_enable_port(LCD_RST_BASE);
// Configure SPI CLK
gpio_config_digital_enable(LCD_GPIO_BASE, LCD_CLK_PIN);
gpio_config_alternate_function(LCD_GPIO_BASE, LCD_CLK_PIN);
gpio_config_port_control(LCD_GPIO_BASE, LCD_CLK_PIN_PCTL);
// Configure SPI MOSI
gpio_config_digital_enable(LCD_GPIO_BASE, LCD_MOSI_PIN);
gpio_config_alternate_function(LCD_GPIO_BASE, LCD_MOSI_PIN);
gpio_config_port_control(LCD_GPIO_BASE, LCD_MOSI_PIN_PCTL);
// Configure CS to be a normal GPIO pin that is controlled
// explicitly by software
gpio_config_digital_enable(LCD_GPIO_BASE, LCD_CS_PIN);
gpio_config_alternate_function(LCD_GPIO_BASE, LCD_CS_PIN);
gpio_config_port_control(LCD_GPIO_BASE, LCD_CS_PIN_PCTL);
// Configure CD to be a normal GPIO pin that is controlled
// explicitly by software
gpio_config_digital_enable(LCD_GPIO_BASE, LCD_CD_PIN);
gpio_config_enable_output(LCD_GPIO_BASE, LCD_CD_PIN);
// Configure RST_N to be a normal GPIO pin that is controlled
// explicitly by software
gpio_config_digital_enable(LCD_RST_BASE, LCD_RST_PIN);
gpio_config_enable_output(LCD_RST_BASE, LCD_RST_PIN);
initialize_spi(LCD_SPI_BASE, 3);
}
int main()
{
initialize_io();
initialize_spi();
const int MAGIC_SPI_TRANSMIT_DELAY = 12; // actually seems to be 10 but let's be safe here
const int MAGIC_MUX_SWITCH_DELAY = 100; // way to large but let's be generous
int RGB_counter = 0;
int LED_counter = 0;
int LED_R = 0x01;
int LED_G = 0x01;
int LED_B = 0x01;
const int CYCLE_SIZE = 16;
bool isReadySPI = false;
bool isCommResetting = false;
bool isCommTransmitting = false;
// Data variables. (NOTE: Not sure if these should be "volatile".)
uint8_t t_isPressedDebugA = 0x00; // 1 bit (1 = true)
uint8_t t_isPressedDebugB = 0x00; // 1 bit (1 = true)
uint8_t t_XY_low = 0x00; // 8 bits
uint8_t t_XY_high = 0x00; // 7 bits
uint8_t t_Z_low = 0x00; // 8 bits
uint8_t t_Z_high = 0x00; // 1 bit
uint8_t t_bump_map = 0x00; // 8 bits
uint8_t t_overheat_alert = 0x00; // 1 bit
uint8_t t_overheat_map = 0x00; // 8 bits
uint8_t t_IR_alert = 0x00; // 1 bit
// Doesn't work on an ATmega8.
//// Delay the clock frequency change to ensure re-programmability.
//// The argument for the delay may be completely off because at this
//// point in the program the specified `F_CPU` does not match the
//// actual clock's frequency.
//ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
// // Delay!
_delay_ms(100);
//
// //CLKPR = 1 << CLKPCE; // "only updated when [... the other bits are] written to zero"
// //CLKPR &= ~(1<<CLKPS0);
// //CLKPR &= ~(1<<CLKPS1);
// //CLKPR &= ~(1<<CLKPS2);
// //CLKPR &= ~(1<<CLKPS3);
// //// ^ (0b0000) Corresponds to a division factor of 1.
//
// // Someone else's way of doing it.
// CLKPR = 0x80;
// CLKPR = 0x00;
//}
// Check if other MCUs are ready to go.
// TODO: Periodically check for connectivity later.
resync_spi();
isReadySPI = true;
// NOTE: FOR SOME REASON THIS LINE BREAKS THINGS :(
sei(); // ready to go.
while (true) {
++RGB_counter;
RGB_counter %= 3;
if (RGB_counter == 0) {
++LED_counter;
LED_counter %= CYCLE_SIZE;
}
auto req_data = [](uint8_t SPI_code) -> uint8_t
{
_delay_us(MAGIC_SPI_TRANSMIT_DELAY);
SPDR = SPI_code;
while ( !(SPSR & (1<<SPIF)) ) { ; } // wait for reception to complete
uint8_t byte_read = SPDR;
return byte_read;
};
// ask for stuff, update registers
set_SPI_mux(MUX_1);
_delay_us(MAGIC_MUX_SWITCH_DELAY);
uint8_t check_link = req_data(SPI_REQ_DEBUG_A);
if (check_link != SPI_ACK_READY) {
resync_spi();
}
t_isPressedDebugA = req_data(SPI_REQ_DEBUG_B);
t_isPressedDebugB = req_data(SPI_REQ_Z_LOW);
t_Z_low = req_data(SPI_REQ_Z_HIGH);
t_Z_high = req_data(SPI_REQ_XY_LOW);
t_XY_low = req_data(SPI_REQ_XY_HIGH);
t_XY_high = req_data(SPI_REQ_BUMP_MAP);
t_bump_map = req_data(SPI_REQ_OVERHEAT_ALERT);
t_overheat_alert = req_data(SPI_REQ_OVERHEAT_MAP);
t_overheat_map = req_data(SPI_REQ_IR_ALERT);
t_IR_alert = req_data(SPI_TRANSMIT_OVER);
set_SPI_mux(MUX_2);
_delay_us(MAGIC_MUX_SWITCH_DELAY);
// NOTE: get rid of this
_delay_us(100); // pretend we do other stuff here
if (t_isPressedDebugA == 0x00) {
LED_G = 0x01;
} else {
LED_G = 0x00;
}
if (t_isPressedDebugB == 0x00) {
LED_B = 0x01;
} else {
LED_B = 0x00;
}
// LED stuffs
PORTC |= 0b111<<PC0;
switch (RGB_counter) {
case 0 :
if (LED_counter < LED_R) {
PORTC &= ~(1<<PC0);
}
break;
case 1 :
if (LED_counter < LED_G) {
PORTC &= ~(1<<PC1);
}
break;
case 2 :
if (LED_counter < LED_B) {
PORTC &= ~(1<<PC2);
}
break;
}
if (isReadySPI) {
PORTC |= 1<<PC3; // always true for now
} else {
PORTC &= ~(1<<PC3); // R
}
//if (isCommResetting) {
// PORTC |= 1<<PC4;
//} else {
// PORTC &= ~(1<<PC4); // Y
//}
//if (isCommTransmitting) {
// PORTC |= 1<<PC5;
//} else {
// PORTC &= ~(1<<PC5); // G
//}
//// NOTE: Enable this delay if there aren't other delay sources.
//_delay_us(10);
}
}