I'm having problems trying to initialize the MMEM on my TWR-MEM board.
I'm using the following init code:
#define MRAM_START_ADDRESS (*(volatile unsigned char*)(0x60000000))
void FlexBusInit()
{
SIM_SCGC7 |= SIM_SCGC7_FLEXBUS_MASK; // Enable the clock to the FlexBus
SIM_CLKDIV1 |= SIM_CLKDIV1_OUTDIV3(0x0); //FlexBus Clock not divided
// Set the GPIO ports clocks
SIM_SCGC5 = SIM_SCGC5_PORTA_MASK | SIM_SCGC5_PORTB_MASK | SIM_SCGC5_PORTC_MASK |
SIM_SCGC5_PORTD_MASK | SIM_SCGC5_PORTE_MASK;
PORTB_PCR11 = PORT_PCR_MUX(5); // fb_ad[18]
PORTB_PCR16 = PORT_PCR_MUX(5); // fb_ad[17]
PORTB_PCR17 = PORT_PCR_MUX(5); // fb_ad[16]
PORTB_PCR18 = PORT_PCR_MUX(5); // fb_ad[15]
PORTC_PCR0 = PORT_PCR_MUX(5); // fb_ad[14]
PORTC_PCR1 = PORT_PCR_MUX(5); // fb_ad[13]
PORTC_PCR2 = PORT_PCR_MUX(5); // fb_ad[12]
PORTC_PCR4 = PORT_PCR_MUX(5); // fb_ad[11]
PORTC_PCR5 = PORT_PCR_MUX(5); // fb_ad[10]
PORTC_PCR6 = PORT_PCR_MUX(5); // fb_ad[9]
PORTC_PCR7 = PORT_PCR_MUX(5); // fb_ad[8]
PORTC_PCR8 = PORT_PCR_MUX(5); // fb_ad[7]
PORTC_PCR9 = PORT_PCR_MUX(5); // fb_ad[6]
PORTC_PCR10 = PORT_PCR_MUX(5); // fb_ad[5]
PORTD_PCR2 = PORT_PCR_MUX(5); // fb_ad[4]
PORTD_PCR3 = PORT_PCR_MUX(5); // fb_ad[3]
PORTD_PCR4 = PORT_PCR_MUX(5); // fb_ad[2]
PORTD_PCR5 = PORT_PCR_MUX(5); // fb_ad[1]
PORTD_PCR6 = PORT_PCR_MUX(5); // fb_ad[0]
PORTB_PCR20 = PORT_PCR_MUX(5); // fb_ad[31] used as d[7]
PORTB_PCR21 = PORT_PCR_MUX(5); // fb_ad[30] used as d[6]
PORTB_PCR22 = PORT_PCR_MUX(5); // fb_ad[29] used as d[5]
PORTB_PCR23 = PORT_PCR_MUX(5); // fb_ad[28] used as d[4]
PORTC_PCR12 = PORT_PCR_MUX(5); // fb_ad[27] used as d[3]
PORTC_PCR13 = PORT_PCR_MUX(5); // fb_ad[26] used as d[2]
PORTC_PCR14 = PORT_PCR_MUX(5); // fb_ad[25] used as d[1]
PORTC_PCR15 = PORT_PCR_MUX(5); // fb_ad[24] used as d[0]
PORTB_PCR19 = PORT_PCR_MUX(5); // fb_oe_b
PORTC_PCR11 = PORT_PCR_MUX(5); // fb_rw_b
PORTD_PCR1 = PORT_PCR_MUX(5); // fb_cs0_b
PORTD_PCR0 = PORT_PCR_MUX(5); // fb_ale
FB_CSAR0 = (unsigned int)&MRAM_START_ADDRESS; //Set Base address
FB_CSCR0 = ( (FB_CSCR_PS(1)) // 8-bit port
| (FB_CSCR_AA_MASK) // auto-acknowledge
| (FB_CSCR_WS(0x6)) ); // 2 wait states
FB_CSMR0 = ( (FB_CSMR_BAM(0x7)) //Set base address mask for 512K address space
| (FB_CSMR_V_MASK) ); //Enable cs valid signal
}
But after I complete this API call I found that I only have access to every other 16K block of data.
0x60000000 - 0x60001FFF -> work fine
0x60002000 - 0x60003FFF -> does not work
0x60004000 - 0x60005FFF -> work fine
0x60006000 - 0x60007FFF -> does not work
-------
0x6007C000 - 0x6007DFFF -> works fine
0x6007E000 - 0x6007FFFF -> does not work
Any suggestions?
Thanks
