void configure_playback(void) {
int i;
// Defaults, just in case read fails
FX1mode = 0x00;
FX2mode = 0x01;
tempo = 0x80;
latchHold = 0xFFFF;
// Misc initialisation
pressed = 0x0000;
playing = 0x0000;
looping = 0x0000;
loopMod = 0xFFFF;
// Retrieve values from config file
FIL cfgFile;
sdcard_openFile(&cfgFile, 16);
FX1mode = sdcard_readByte(&cfgFile);
FX2mode = sdcard_readByte(&cfgFile);
tempo = sdcard_readByte(&cfgFile);
for (i = 0; i < 16; i++)
{
// Shift in the latch/hold bit
uint8_t lhBit = sdcard_readByte(&cfgFile);
latchHold |= ((!!lhBit) << i);
// Read the loop mode bit
btnLoopMode[i] = sdcard_readByte(&cfgFile);
// Set position ptr to 0
whereLastPress[i] = 0;
}
sdcard_closeFile(&cfgFile);
}
void timers_init(void) {
unsigned long ulDACPeriod, ulPktPeriod, ulTempoPeriod, ulPollPeriod;
// Initialise the output buffer
int i;
for (i = 0; i < BUFFER_SIZE; i++)
{
oBuff[i] = 0x8000;
}
// Open file pointers
for (i = 0; i < 16; i++)
{
sdcard_openFile(&fPtrs[i], i);
}
// Configure the Tempo LED
ROM_GPIOPinTypeGPIOOutput(LED_TEMPO);
ROM_GPIOPinWrite(LED_TEMPO, 0x00);
// Configure the DAC output timer - Timer 0
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
ROM_TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
ulDACPeriod = (ROM_SysCtlClockGet() / 44100); // 44.1 kHz for DAC samples
ROM_TimerLoadSet(TIMER0_BASE, TIMER_A, ulDACPeriod);
// Set up interrupt
ROM_IntPrioritySet(INT_TIMER0A, 0x00);
ROM_IntEnable(INT_TIMER0A);
ROM_TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
// Enable Timer
ROM_TimerEnable(TIMER0_BASE, TIMER_A);
// Configure the SD Card buffer timer - Timer 1
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);
ROM_TimerConfigure(TIMER1_BASE, TIMER_CFG_PERIODIC);
ulPktPeriod = (ROM_SysCtlClockGet() / BUFFERUPDATE_FREQ); // 100 Hz for DAC samples
ROM_TimerLoadSet(TIMER1_BASE, TIMER_A, ulPktPeriod);
// Set up interrupt
ROM_IntPrioritySet(INT_TIMER1A, 0x40);
ROM_IntEnable(INT_TIMER1A);
ROM_TimerIntEnable(TIMER1_BASE, TIMER_TIMA_TIMEOUT);
// Enable Timer
ROM_TimerEnable(TIMER1_BASE, TIMER_A);
// Configure the Tempo timer - Timer 2
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER2);
ROM_TimerConfigure(TIMER2_BASE, TIMER_CFG_PERIODIC);
ulTempoPeriod = (ROM_SysCtlClockGet() / TEMPO_FREQUENCY);
ROM_TimerLoadSet(TIMER2_BASE, TIMER_A, ulTempoPeriod);
// Set up interrupt
ROM_IntPrioritySet(INT_TIMER2A, 0x20);
ROM_IntEnable(INT_TIMER2A);
ROM_TimerIntEnable(TIMER2_BASE, TIMER_TIMA_TIMEOUT);
// Enable Timer
ROM_TimerEnable(TIMER2_BASE, TIMER_A);
// Configure the poll timer
ulPollPeriod = (ROM_SysCtlClockGet() / POLL_FREQUENCY);
ROM_TimerLoadSet(TIMER2_BASE, TIMER_B, ulPollPeriod);
// Set up interrupt
ROM_IntPrioritySet(INT_TIMER2B, 0x20);
ROM_IntEnable(INT_TIMER2B);
ROM_TimerIntEnable(TIMER2_BASE, TIMER_TIMB_TIMEOUT);
// Enable Timer
ROM_TimerEnable(TIMER2_BASE, TIMER_B);
}