Hi I am trying to use flex timer 1 in quadrature mode. I tried to do virtual memory mapping with a structure in order to initialize registers required for flextimer. The program looses connection with the device as soon as memory mapping is done. I am currently deploying the code using ethernet port and providing power supply using the mini usb port. Can somebody also tell me the other dependencies I need to address while using the flextimer to generated pwm?
My code is given below:
#include "stdafx.h"
#include "mapmem.h"
#include "clk_imx7.h"
#include "gpio_imx7.h"
#include <windows.h>
#define CCM_BASE_ADDR 0x30380000
#define CCM_CCGR128 0x30384800
#define CCM_TARGET_ROOT110 0x3038B700
typedef struct{
UINT32 FTM_SC;
UINT32 FTM_CNT;
UINT32 FTM_MOD;
UINT32 FTM_C0SC;
UINT32 FTM_C0V;
UINT32 FTM_C1SC;
UINT32 FTM_C1V;
UINT32 FTM_C2SC;
UINT32 FTM_C2V;
UINT32 FTM_C3SC;
UINT32 FTM_C3V;
UINT32 FTM_C4SC;
UINT32 FTM_C4V;
UINT32 FTM_C5SC;
UINT32 FTM_C5V;
UINT32 FTM_C6SC;
UINT32 FTM_C6V;
UINT32 FTM_C7SC;
UINT32 FTM_C7V;
UINT32 FTM_CNTIN;
UINT32 FTM_STATUS;
UINT32 FTM_MODE;
UINT32 FTM_SYNC;
UINT32 FTM_OUTINIT;
UINT32 FTM_OUTMASK;
UINT32 FTM_COMBINE;
UINT32 FTM_DEADTIME;
UINT32 FTM_EXTTRIG;
UINT32 FTM_POL;
UINT32 FTM_FMS;
UINT32 FTM_FILTER;
UINT32 FTM_QDCTRL;
UINT32 FTM_CONF;
UINT32 FTM_SYNCONF;
UINT32 FTM_INVCTRL;
UINT32 FTM_SWOCTRL;
UINT32 FTM_PWMLOAD;
}tFTM_REGS,*ptFTM_REGS;
BOOL FTM_ConfigureIos(HANDLE hGpio)
{
int i;
BOOL fSuccess = TRUE;
const uIo eimIo[] =
{
COLIBRI_PIN( 30), // flextimer1.PHA
COLIBRI_PIN( 67), // flextimer1.PHB
COLIBRI_PIN( 29) //flextimer1.CH[7]
};
/// The Flextimer functionality is on ALT 5 and the channel is on ALT 2.
for (i = 0; i < 2; i++) //_countof(eimIo)
fSuccess &= Imx7Gpio_SetConfigString(hGpio, eimIo[i], NULL, L"AltFn=5,dir=in", StoreVolatile);
fSuccess &= Imx7Gpio_SetConfigString(hGpio, eimIo[2], NULL, L"AltFn=2,dir=out", StoreVolatile);
return fSuccess;
}
int wmain(int argc, _TCHAR* argv[])
{
BOOL fSuccess = TRUE;
HANDLE hMap;
HANDLE hGpio;
ptFTM_REGS pFtm1Reg;
ptFTM_REGS pFtm1Reg;
UINT32 *tmp_ptr=NULL;
//volatile DWORD *clkRegs;
//volatile DWORD tmp;
//volatile DWORD *targetAddr;
char usr_input;
hMap=Map_Init();
hGpio = Imx7Gpio_Init(NULL);
fSuccess = FTM_ConfigureIos(hGpio);
fSuccess &= Imx7Gpio_Deinit(hGpio);
printf("%d\n",fSuccess);
pFtm1Reg=(ptFTM_REGS)Map_MapMemory(0x30640000,0x1000); //FTM1_SC is at 0x30640000
// FAILS AT THIS POINT *********************************************
//initialization is mentioned on pg 4197
pFtm1Reg->FTM_MODE=0xE0000000;
pFtm1Reg->FTM_POL=0x00000000; //24 0 channel polarity is active high
pFtm1Reg->FTM_OUTMASK=0x00000000; //24 0 works normally
pFtm1Reg->FTM_MOD=0xFFFFFFFF; //16-32 ffff modulo value used in case of overflow
pFtm1Reg->FTM_CNTIN=0x00000000; //intial counter value
pFtm1Reg->FTM_SC=0x90000000; // 27-28 01 system clk
// 29-31 001 divide by 2
pFtm1Reg->FTM_C7SC=0x18000000; //channel status and control register
//26-27 01 mode selection output compare
//28-29 10 edge selection clear on match
pFtm1Reg->FTM_C7V=0x00100000;
pFtm1Reg->FTM_FMS=0x00000000; //25 0 write protection disabled
pFtm1Reg->FTM_SYNC=0x00000000; //used for PWM sychronization
pFtm1Reg->FTM_OUTINIT=0x00000000; //output initialization value for channels
pFtm1Reg->FTM_SYNCONF=0x00000000; //PWM synchronization configuration, SWOCTRL, INVCTRL
//and CNTIN registers synchronization
pFtm1Reg->FTM_COMBINE=0x00000000; //configure the synchronization, deadtime
//insertion, Dual Edge Capture mode, Complementary,
//and Combine mode for each pair of channels (n) and (n+1)
pFtm1Reg->FTM_CONF=0x00000000; //global time base for other FTM //unsure of use
pFtm1Reg->FTM_CNT=0x00000000; // initialize count
pFtm1Reg->FTM_QDCTRL=0xF0000000; //24 0 phase A input filter enable
//25 0 phase B filter input enable
//26 0 phase A input polarity
//27 0 phase B input polarity
//28 1 qadrature decoder mode
//29 1 FTM counter direction
//30 1 timer overflow direction
//31 1 quadrature decoder mode enable
pFtm1Reg->FTM_PWMLOAD=0x01800000; //22 1 load enable MOD, CNTIN, and CV
//24 1 channel 7 selected for compare match
while(TRUE){
scanf("%c",usr_input);
if(usr_input){
printf("\n encoder count: %zu",pFtm1Reg->FTM_CNT);
}
else if(usr_input=='Q' || usr_input=='q')
{
break;
}
}
return 0;
}
