Hi. I'm trying to use DMM in direct data mode to get some data from an external device. 8 Data, clock, and sync pins are being used. I have used Halcogen 03.06.00 to generate startup code necessary for the Hercules to get up and running. In Halcogen, I've enabled only the GIO and DMM drivers. I had to add a little bit of my code inside the function dmmInit generated by the Halcogen. I've pasted my code below. You can see that in the function main, I called the function dmmInit, initialized the data buffer to some known number, and then kept polling and printing the first byte of the buffer to see if the content is different. Somehow it's not working, the content of the first byte of the buffer to stuck to the initialized value even though there are data are coming into the pins. I'd like to make sure the register settings I have for the DMM is correct before I proceed to debug to the external device. Could anyone please help?
#pragma DATA_ALIGN(gucDmmBuffer, 256);
unsigned char gucDmmBuffer[256];
void dmmInit(void)
{
/* USER CODE BEGIN (2) */
/* USER CODE END */
/** @b intalise @b DMM */
/** @b initialize @b DMM @b Port */
dmmREG->PC3 = 0U /* DMM SYNC */
| (0U << 1U) /* DMM CLK */
| (0U << 2U) /* DATA[0] */
| (0U << 3U) /* DATA[1] */
| (0U << 4U) /* DATA[2] */
| (0U << 5U) /* DATA[3] */
| (0U << 6U) /* DATA[4] */
| (0U << 7U) /* DATA[5] */
| (0U << 8U) /* DATA[6] */
| (0U << 9U) /* DATA[7] */
| (0U << 10U) /* DATA[8] */
| (0U << 11U) /* DATA[9] */
| (0U << 12U) /* DATA[10] */
| (0U << 13U) /* DATA[11] */
| (0U << 14U) /* DATA[12] */
| (0U << 15U) /* DATA[13] */
| (0U << 16U) /* DATA[14] */
| (0U << 17U) /* DATA[15] */
| (0U << 18U); /* DMM ENA */
/** - DMM Port direction */
dmmREG->PC1 = 0U /* DMM SYNC */
| (0U << 1U) /* DMM CLK */
| (0U << 2U) /* DATA[0] */
| (0U << 3U) /* DATA[1] */
| (0U << 4U) /* DATA[2] */
| (0U << 5U) /* DATA[3] */
| (0U << 6U) /* DATA[4] */
| (0U << 7U) /* DATA[5] */
| (0U << 8U) /* DATA[6] */
| (0U << 9U) /* DATA[7] */
| (0U << 10U) /* DATA[8] */
| (0U << 11U) /* DATA[9] */
| (0U << 12U) /* DATA[10] */
| (0U << 13U) /* DATA[11] */
| (0U << 14U) /* DATA[12] */
| (0U << 15U) /* DATA[13] */
| (0U << 16U) /* DATA[14] */
| (0U << 17U) /* DATA[15] */
| (0U << 18U); /* DMM ENA */
/** - DMM Port open drain enable */
dmmREG->PC6 = 0U /* DMM SYNC */
| (0U << 1U) /* DMM CLK */
| (0U << 2U) /* DATA[0] */
| (0U << 3U) /* DATA[1] */
| (0U << 4U) /* DATA[2] */
| (0U << 5U) /* DATA[3] */
| (0U << 6U) /* DATA[4] */
| (0U << 7U) /* DATA[5] */
| (0U << 8U) /* DATA[6] */
| (0U << 9U) /* DATA[7] */
| (0U << 10U) /* DATA[8] */
| (0U << 11U) /* DATA[9] */
| (0U << 12U) /* DATA[10] */
| (0U << 13U) /* DATA[11] */
| (0U << 14U) /* DATA[12] */
| (0U << 15U) /* DATA[13] */
| (0U << 16U) /* DATA[14] */
| (0U << 17U) /* DATA[15] */
| (0U << 18U); /* DMM ENA */
/** - DMM Port pullup / pulldown selection */
dmmREG->PC8 = 1U /* DMM SYNC */
| (1U << 1U) /* DMM CLK */
| (1U << 2U) /* DATA[0] */
| (1U << 3U) /* DATA[1] */
| (1U << 4U) /* DATA[2] */
| (1U << 5U) /* DATA[3] */
| (1U << 6U) /* DATA[4] */
| (1U << 7U) /* DATA[5] */
| (1U << 8U) /* DATA[6] */
| (1U << 9U) /* DATA[7] */
| (1U << 10U) /* DATA[8] */
| (1U << 11U) /* DATA[9] */
| (1U << 12U) /* DATA[10] */
| (1U << 13U) /* DATA[11] */
| (1U << 14U) /* DATA[12] */
| (1U << 15U) /* DATA[13] */
| (1U << 16U) /* DATA[14] */
| (1U << 17U) /* DATA[15] */
| (1U << 18U); /* DMM ENA */
/** - DMM Port pullup / pulldown enable*/
dmmREG->PC7 = 1U /* DMM SYNC */
| (1U << 1U) /* DMM CLK */
| (1U << 2U) /* DATA[0] */
| (1U << 3U) /* DATA[1] */
| (1U << 4U) /* DATA[2] */
| (1U << 5U) /* DATA[3] */
| (1U << 6U) /* DATA[4] */
| (1U << 7U) /* DATA[5] */
| (1U << 8U) /* DATA[6] */
| (1U << 9U) /* DATA[7] */
| (1U << 10U) /* DATA[8] */
| (1U << 11U) /* DATA[9] */
| (1U << 12U) /* DATA[10] */
| (1U << 13U) /* DATA[11] */
| (1U << 14U) /* DATA[12] */
| (1U << 15U) /* DATA[13] */
| (1U << 16U) /* DATA[14] */
| (1U << 17U) /* DATA[15] */
| (1U << 18U);/* DMM ENA */
/* DMM set all pins to functional */
dmmREG->PC0 = 1U /* DMM SYNC */
| (1U << 1U) /* DMM CLK */
| (1U << 2U) /* DATA[0] */
| (1U << 3U) /* DATA[1] */
| (1U << 4U) /* DATA[2] */
| (1U << 5U) /* DATA[3] */
| (1U << 6U) /* DATA[4] */
| (1U << 7U) /* DATA[5] */
| (1U << 8U) /* DATA[6] */
| (1U << 9U) /* DATA[7] */
| (0U << 10U) /* DATA[8] */
| (0U << 11U) /* DATA[9] */
| (0U << 12U) /* DATA[10] */
| (0U << 13U) /* DATA[11] */
| (0U << 14U) /* DATA[12] */
| (0U << 15U) /* DATA[13] */
| (0U << 16U) /* DATA[14] */
| (0U << 17U) /* DATA[15] */
| (1U << 18U); /* DMM ENA */
/* USER CODE BEGIN (3) */
/* set the Direct Data Mode destionation register */
dmmREG->DDMDEST = (uint32)gucDmmBuffer;
/* set the Direct Data Mode blocksize to 256 bytes */
dmmREG->DDMBL = 0x4;
/* start the DMM module */
dmmREG->GLBCTRL = (1U << 8U) /* Direct Data Mode */
| (1U << 10U)
| (0U << 9U) /* DDM Width to 8 bits */
| (1U << 3U)
| (1U << 1U); /* turn on the DDM mode */
/* USER CODE END */
}
void main(void)
{
/* USER CODE BEGIN (3) */
int i;
dmmInit();
for(i = 0; i < 256; i++)
gucDmmBuffer[i] = 0xA5;
while(1)
{
printf("DMM Data Ptr location: %d\n", gucDmmBuffer[0]);
}
/* USER CODE END */
}
