Mike Moore
This is an involuntary fork, created because the repository would not update mmSPI. SPI library used to communicate with an altera development board attached to four zigbee-header pins.
Dependents: Embedded_RTOS_Project
Fork of
mmSPI
by 
Mike Moore
Diff: mmSPI.cpp
- Revision:
- 18:4a29cad91540
- Parent:
- 17:b81c0c1f312f
- Child:
- 19:c2b753533b93
--- a/mmSPI.cpp Mon Aug 19 18:26:39 2013 +0000
+++ b/mmSPI.cpp Mon Aug 19 20:45:29 2013 +0000
@@ -144,10 +144,7 @@
{
dMisoByteIndex = dIndex / 8;
dMisoBitIndex = dIndex % 8;
- pcReceive[dMisoByteIndex] = pcReceive[dMisoByteIndex] | (*pMISO << dMisoBitIndex);
-
-// pcReceive[dMisoByteIndex] = pcReceive[dMisoByteIndex] | (0x23 << dMisoBitIndex);
-
+ pcReceive[dMisoByteIndex] = pcReceive[dMisoByteIndex] | (*pMISO << dMisoBitIndex);
*pSCLK = 1;
wait(fSPIquarterP);
wait(fSPIquarterP);
@@ -252,20 +249,21 @@
//----------------------------------------------//------------------------------
void mmSPI::write_register(char cRegister, char cValue, char * pcReceive, char * pcSend)
{
- pcSend[7] = 0x02;
+ int dLoop; // loop index.
+
+ // clear transmit vector.
+ for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+
+ pcSend[7] = 0x02; // mbed sends a command.
+
+ // align into instruction word.
pcSend[1] = ((cRegister & 0x07) << 2) | 0xA0;
- pcSend[0] = cValue & 0xFF;
-
- transceive_vector2(pcReceive, pcSend, 8);
+ pcSend[0] = cValue & 0xFF; // immediate value to i.w.
- pcSend[7] = 0x00;
- pcSend[6] = 0x00;
- pcSend[5] = 0x00;
- pcSend[4] = 0x00;
- pcSend[3] = 0x00;
- pcSend[2] = 0x00;
- pcSend[1] = 0x00;
- pcSend[0] = 0x00;
+ transceive_vector2(pcReceive, pcSend, 8); // transmit command.
+
+ // clear transmit vector.
+ for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
}
//----------------------------------------------//------------------------------
// returns the content of
@@ -273,14 +271,80 @@
char mmSPI::read_register(char cRegister, char * pcReceive, char * pcSend)
{
int dLoop; // send all 0.
- for (dLoop = 0; dLoop < 8; dLoop++) pcSend = 0x00;
-
-
+ for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+
transceive_vector2(pcReceive, pcSend, 8); // snap & scan-out reg contents.
return (pcReceive[cRegister]); // return the particular reg value.
}
//----------------------------------------------//------------------------------
+ void mmSPI::write_memory(char cHData, char cLdata, char cAddress, char * pcReceive, char * pcSend)
+ {
+ int dLoop; // loop index.
+
+ // clear transmit vector.
+ for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+
+ // R3 <- address.
+ // R2 <- high-data.
+ // R1 <- low-data.
+ write_register(0x03,cAddress, pcReceive, pcSend);
+ write_register(0x02,cHData, pcReceive, pcSend);
+ write_register(0x01,cLdata, pcReceive, pcSend);
+
+ pcSend[7] = 0x02; // write-enable high.
+ pcSend[1] = 0x02;
+ pcSend[0] = 0x00;
+
+
+ transceive_vector2(pcReceive, pcSend, 8);
+
+ pcSend[7] = 0x02; // write-enable low.
+ pcSend[1] = 0x00;
+ pcSend[0] = 0x00;
+ transceive_vector2(pcReceive, pcSend, 8);
+
+ // clear transmit vector.
+ for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+ }
+//----------------------------------------------//------------------------------
+ // fetch a word from main memory.
+ unsigned int mmSPI::read_memory(char cAddress, char * pcReceive, char * pcSend)
+ {
+ int dLoop; // loop index.
+ unsigned int udMemoryContent; // return variable.
+ char cHData; // returned data-high.
+ char cLData; // returned data-low.
+
+ // clear transmit vector.
+ for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+
+ // R3 <- address.
+ write_register(0x03,cAddress, pcReceive, pcSend);
+
+ pcSend[7] = 0x02; // mbed sends command.
+ pcSend[1] = 0x68; // R2 <- MM[R3]
+ pcSend[0] = 0x00;
+ transceive_vector2(pcReceive, pcSend, 8); // send command.
+
+ pcSend[7] = 0x02; // mbed sends command.
+ pcSend[1] = 0x64; // R1 <- MM[R3]
+ pcSend[0] = 0x00;
+ transceive_vector2(pcReceive, pcSend, 8); // send command.
+
+ // obtain MM content.
+ cHData = read_register(0x02, pcReceive, pcSend);
+ cLData = read_register(0x01, pcReceive, pcSend);
+
+
+ udMemoryContent = (cHData << 8) + cLData; // build the memory word.
+
+ // clear transmit vector.
+ for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+
+ return udMemoryContent; // return the memory word.
+ }
+//----------------------------------------------//------------------------------
void mmSPI::write_pulse(char * pcReceive, char * pcSend)