I migrated my Atmega328p projet to an Atmega32A device, becuause it has a JTAG interface, and easier to debug problems. With the Mega328p I was handling an SD card with FatFS successful. I copied the source code and made the necessary adjusments (SPI pinout definition) in the FatFs library, but regarding the datasheet the SPI registers and settings are the same, I thought it is enough. I'm using the sample code from ffsample.zip:
int main(void)
{
UINT bw;
FRESULT fr;
FATFS fs;
FIL fil;
UART_Init(9600);
LCDInit(LS_NONE);
LCDClear();
LCDWriteStringXY(0, 0, "Welcome");
_delay_ms(1000);
// SDCard write test
f_mount(&fs, "", 0); /* Give a work area to the default drive */
fr = f_open(&fil, "newfile.txt", FA_WRITE | FA_CREATE_ALWAYS); /* Create a file */
LCDWriteIntXY(0, 1, fr, 1);
if (fr == FR_OK)
{
f_write(&fil, "It works!\r\n", 11, &bw); /* Write data to the file */
LCDWriteIntXY(2, 1, bw, 2);
fr = f_close(&fil);
LCDWriteIntXY(5, 1, fr, 1);
if (fr == FR_OK && bw == 11)
{
LCDClear();
LCDWriteStringXY(0, 0, "Written");
}
}
while(1){}
}
adjustments in mmc_avr.c:
/* Port controls (Platform dependent) */
#define SS (1<<PORTB4)
#define MOSI (1<<PORTB5)
#define MISO (1<<PORTB6)
#define SCK (1<<PORTB7)
#define CS_LOW() PORTB &= ~SS /* CS=low */
#define CS_HIGH() PORTB |= SS /* CS=high */
#define FCLK_SLOW() SPCR = 0x52 /* Set slow clock (F_CPU / 64) */
#define FCLK_FAST() SPCR = 0x50 /* Set fast clock (F_CPU / 4) */
static
void power_on (void)
{
DDRB |= SS | SCK | MOSI;
SPCR = 0x52; /* Enable SPI function in mode 0 */
SPSR = 0x01; /* SPI 2x mode */
}
static
void power_off (void)
{
/* Disable SPI function */
SPCR = 0;
/* Set SCK/MOSI/CS as hi-z, INS#/WP as pull-up */
DDRB &= ~(SS | SCK | MOSI);
}With the Mega328p I was using Atmel Studio 7, but with the JTAG-ICE debugger from ebay, I'm using AVR Studio 4.17. I tried to compile the Atmega32 code in Atmel Studio 7 too, but the result was annoying.
The newfile.txt sometimes created, sometimes not, and sometimes a bunch of unreadable files also created with a strange-character name.
Do you know any major differnce between the 2 CPU which makes difference?
