void Console_reset( char ch){
switch (resetcounter) {
case 0: if (ch=='r') resetcounter++; else resetcounter=0; break;
case 1: if (ch=='e') resetcounter++; else resetcounter=0; break;
case 2: if (ch=='s') resetcounter++; else resetcounter=0; break;
case 3: if (ch=='e') resetcounter++; else resetcounter=0; break;
case 4: if (ch=='t') resetcounter++; else resetcounter=0; break;
}
if (resetcounter ==5){
DDS_reset();
putstring("reset jott ");
resetcounter=0;
}
}
/************************************************************
Function: DDS_init()
Argument:
Description: Initializes serial mode on all AD9851 DDS.
Action:
Must be run after InitDDS_IO();
W_CLK_1 - DAI_PB10
W_CLK_2 - DAI_PB08
W_CLK_3 - DAI_PB06
DATA(SDI) - DAI_PB07
FQ_UD - DAI_PB09
RESET - DAI_PB05
AD9851 Initialization sequence:
1. Reset all DDS.
2. Assert W_CLK to load Serial enable sequence
3. Update Frequency
4. -- Serial Mode is Loaded --
5. Write a valid 40-bit word to each DDS
(F=0Hz, Phase = 0)
6. Update Frequency
Extra: Figure 17, p.15 , AD9851 Datasheet
tDS Data setup time
Hardwired serial mode - Just send W_CLK# and FQ_UD
************************************************************/
void DDS_init(void){
char k,i;
// 0. Generate DDS_OSCILLATOR_CLOCK
// *pPCG_PW2 = ((sample_period*PCG_TICKS_PER_uSEC)-1)<<16;
// PCG clock input is from PCLK
*pPCG_SYNC1 |= CLKA_SOURCE_IOP|FSA_SOURCE_IOP|CLKA_SYNC;
*pPCG_CTLA1 |= 0;
// DDS_OSC = 20MHz
*pPCG_CTLA0 = DDS_OSC_PCLK_DIVIDER | ENFSA | ENCLKA ;
/* To output a 100 MHz signal to the output of the DAI.
*pPCG_SYNC1 |= CLKB_SOURCE_IOP|FSB_SOURCE_IOP|CLKB_SYNC;
*pPCG_CTLB1 |= 0;
// DDS_OSC = 20MHz
*pPCG_CTLB0 = 2 | ENFSB | ENCLKB ;
SRU (PCG_FSB_O, DAI_PB12_I);
SRU(HIGH,PBEN12_I);
*/
// 1. Reset all DDS.
DDS_reset();
// 2. Assert W_CLK to load Serial enable sequence
DDS_W_CLK1_H;
DDS_W_CLK2_H;
DDS_W_CLK3_H;
for(k=0;k<100;k++);
DDS_W_CLK1_L;
DDS_W_CLK2_L;
DDS_W_CLK3_L;
for(k=0;k<100;k++);
// 3. Update Frequency
DDS_update_frequency();
// 4. -- Serial Mode is Loaded --
// 5. Write a valid 40-bit word to each DDS
/* USING SPORTs INTERFACE:
DDS1_frequency = DDS2_frequency = DDS3_frequency = DDS_0Hz;
DDS1_phase = DDS2_phase = DDS3_phase = DDS_PHASE_0;
DDS_set_DMA(DDS_ch1);
DDS_set_SRU(DDS_ch1);
DDS_start_SPORT();
DDS_set_DMA(DDS_ch2);
DDS_set_SRU(DDS_ch2);
DDS_start_SPORT();
DDS_set_DMA(DDS_ch3);
DDS_set_SRU(DDS_ch3);
DDS_start_SPORT();
*/
/* USING BIT BANGING SOFTWARE MODE */
DDS_WriteData(DDS_0Hz, DDS_PHASE_0, 0, DDS_ch1);
DDS_WriteData(DDS_0Hz, DDS_PHASE_0, 0, DDS_ch2);
DDS_WriteData(DDS_0Hz, DDS_PHASE_0, 0, DDS_ch3);
DDS_update_frequency();
// 6. Update Frequency
DDS_update_frequency();
for(k=0;k<100;k++);
}
