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Tested reading the entire SIMM contents back to the computer (it works)

This commit is contained in:
Doug Brown 2011-12-10 13:53:43 -08:00
parent 7db22e08af
commit 1540bcadd1
3 changed files with 53 additions and 9 deletions
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20
external_mem.c
View File

@ -97,6 +97,11 @@ void ExternalMem_AssertOE(void)
Ports_SetOEOut(0);
}
void ExternalMem_DeassertOE(void)
{
Ports_SetOEOut(1);
}
void ExternalMem_Read(uint32_t startAddress, uint32_t *buf, uint32_t len)
{
ExternalMem_AssertCS();
@ -108,11 +113,14 @@ void ExternalMem_Read(uint32_t startAddress, uint32_t *buf, uint32_t len)
// Shouldn't need to wait here. Each clock cycle at 16 MHz is 62.5 nanoseconds, so by the time the SPI
// read has been signaled with the SPI chip, there will DEFINITELY be good data on the data bus.
// (Considering these chips will be in the 70 ns or 140 ns range, that's only a few clock cycles at most)
*buf++ = ExternalMem_ReadData();
// TODO: Change the read data routines to put them in the correct order as is so I don't have to do this
// (Might shave a second or so off the read time)
uint32_t tmp = ExternalMem_ReadData();
tmp = (tmp & 0xFF) << 24 |
((tmp >> 8) & 0xFF) << 16 |
((tmp >> 16) & 0xFF) << 8 |
((tmp >> 24) & 0xFF) << 0;
*buf++ = tmp;
}
}
void ExternalMem_DeassertOE(void)
{
Ports_SetOEOut(1);
}

3
external_mem.h
View File

@ -41,4 +41,7 @@ void ExternalMem_DeassertWE(void);
void ExternalMem_AssertOE(void);
void ExternalMem_DeassertOE(void);
// Reads a set of data...
void ExternalMem_Read(uint32_t startAddress, uint32_t *buf, uint32_t len);
#endif /* EXTERNAL_MEM_H_ */

39
usb_serial/usb_serial.c
View File

@ -43,9 +43,10 @@ void USBSerial_Check(void)
if (CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface))
{
CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
//CDC_Device_SendString(&VirtualSerial_CDC_Interface, "Reading...");
//CDC_Device_Flush(&VirtualSerial_CDC_Interface);
uint32_t mem = ExternalMem_ReadData();
/*uint32_t mem = ExternalMem_ReadData();
char dataString[11];
@ -63,7 +64,39 @@ void USBSerial_Check(void)
sprintf(dataString, "%02X %02X %02X\r\n", DDRA, DDRC, DDRD);
CDC_Device_SendString(&VirtualSerial_CDC_Interface, dataString);
CDC_Device_SendString(&VirtualSerial_CDC_Interface, dataString);*/
#define BUFSIZE 128UL
static uint32_t readBuf[BUFSIZE];
int x;
for (x = 0; x < 512UL * 1024UL / BUFSIZE; x++)
{
ExternalMem_Read(x*BUFSIZE, readBuf, BUFSIZE);
if (CDC_Device_SendData(&VirtualSerial_CDC_Interface, (const char *)readBuf, BUFSIZE*4) != ENDPOINT_RWSTREAM_NoError)
{
PORTD |= (1 << 7);
}
//int y;
//for (y = 0; y < BUFSIZE; y++)
//{
//if ((y % 4) == 0) CDC_Device_SendString(&VirtualSerial_CDC_Interface, ".\r\n");
//char tmpBuf[20];
//sprintf(tmpBuf, "%02X %02X %02X %02X ",
// (uint8_t)(readBuf[y] >> 24),
// (uint8_t)(readBuf[y] >> 16),
// (uint8_t)(readBuf[y] >> 8),
// (uint8_t)(readBuf[y] >> 0));
//CDC_Device_SendString(&VirtualSerial_CDC_Interface, tmpBuf);
//}
//if ((x % 64) == 0) CDC_Device_SendString(&VirtualSerial_CDC_Interface, "\r\n");
//CDC_Device_SendString(&VirtualSerial_CDC_Interface, ".");
//CDC_Device_Flush(&VirtualSerial_CDC_Interface);
}
//CDC_Device_SendString(&VirtualSerial_CDC_Interface, "\r\nDone\r\n");
}
/*int16_t rb = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);