void ST7540_transmit(uint8_t temp){
//Set the appropriate flags and transmit
tx_mode();
ss_clear();
spi_transmit(temp);
ss_set();
rx_mode();
}
void ST7540_init(){
//Configure output
DDR_RXTX |= (1<<RXTX);
DDR_REG_DATA |= (1<<REG_DATA);
//Configure input
DDR_CD_PD &= ~(1<<CD_PD);
DDR_BU_THERM &= ~(1<<BU_THERM);
ss_set();
}
void ST7540_setup(){
reg_acc();
tx_mode();
while ((PIN_SPI & (1<<SCK))!=0);
ss_clear();
//Send configuration bytes to ST7540 control register
spi_transmit(0x13);
spi_transmit(0xB2);
spi_transmit(0x32);
ss_set();
}
void pm_setup(void)
{
cr0_set(cr0_get() | CR0_PM);
cs_set(KERNEL_CS);
ds_set(KERNEL_DS);
es_set(KERNEL_DS);
fs_set(KERNEL_DS);
gs_set(KERNEL_DS);
ss_set(KERNEL_DS);
console_message(T_OK, "Kernel now running in protected-mode");
}