/*********************************************************************
* init_dma_timers - DMA Timers *
**********************************************************************/
static void init_dma_timers(void)
{
/* DMA Timer 0 disabled (DTMR0[RST] = 0) */
MCF_DTIM0_DTMR = 0;
MCF_DTIM0_DTXMR = 0;
MCF_DTIM0_DTRR = MCF_DTIM_DTRR_REF(0xffffffff);
/* DMA Timer 1 disabled (DTMR1[RST] = 0) */
MCF_DTIM1_DTMR = 0;
MCF_DTIM1_DTXMR = 0;
MCF_DTIM1_DTRR = MCF_DTIM_DTRR_REF(0xffffffff);
/* DMA Timer 2 disabled (DTMR2[RST] = 0) */
MCF_DTIM2_DTMR = 0;
MCF_DTIM2_DTXMR = 0;
MCF_DTIM2_DTRR = MCF_DTIM_DTRR_REF(0xffffffff);
/* DMA Timer 3 disabled (DTMR3[RST] = 0) */
MCF_DTIM3_DTMR = 0;
MCF_DTIM3_DTXMR = 0;
MCF_DTIM3_DTRR = MCF_DTIM_DTRR_REF(0xffffffff);
}
/*
* Initializes the DTIM3 timer.
*/
void dtim3_init() {
// Set reset bit then clear it
MCF_DTIM3_DTMR |= MCF_DTIM_DTMR_RST;
MCF_DTIM3_DTMR &= ~(MCF_DTIM_DTMR_RST);
/*MCF_DTIM3_DTMR = MCF_DTIM_DTMR_PS(79)
| MCF_DTIM_DTMR_CE(MCF_DTIM_DTMR_CE_NONE) // Capture Edge = Neither rising or falling
| MCF_DTIM_DTMR_CLK_DIV16 // Divide by 16 (n = 4. 2^4)
| MCF_DTIM_DTMR_FRR; // Free Run (keep counting even when reference register has been passed)*/
MCF_DTIM3_DTMR = 0x4F0A;
MCF_DTIM3_DTER |= MCF_DTIM_DTER_REF | MCF_DTIM_DTER_CAP; // Event Register is setup for reference and capture events
MCF_DTIM3_DTRR = MCF_DTIM_DTRR_REF(0); // Clear reference register
MCF_DTIM3_DTCR = MCF_DTIM_DTCR_CAP(0); // Clear capture register. Capture is count at which the reference register was met
MCF_DTIM3_DTCN = MCF_DTIM_DTCN_CNT(0); // Clear counter register
MCF_DTIM3_DTXMR = 0x40;
}
/*
* Configures the appropriate DTIM3 registers to delay for p_usecs microseconds.
*/
void dtim3_delay_us(int p_usecs) {
// Reset timer counter
MCF_DTIM3_DTCN = 0;
// Set reference register timeout
MCF_DTIM3_DTRR = MCF_DTIM_DTRR_REF((uint32_t)(p_usecs-1));
// Output reference, clear any pending DMA requests
MCF_DTIM3_DTER |= MCF_DTIM_DTER_REF;
// Enables the counter
MCF_DTIM3_DTMR |= MCF_DTIM_DTMR_RST;
while( MCF_DTIM3_DTER != (0x2)) {
// Spin until the flag is set
}
}
