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:
- 24:d3b8c68f41f2
- Parent:
- 23:dbd89a56716d
- Child:
- 26:26a8f31a31b8
--- a/mmSPI.cpp Tue Aug 20 14:25:47 2013 +0000
+++ b/mmSPI.cpp Tue Aug 20 14:38:50 2013 +0000
@@ -126,8 +126,7 @@
{
int dLoop; // loop index.
- // clear transmit vector.
- for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+ clear_transmit_vector(); // clear transmit vector.
pcSend[7] = 0x02; // mbed sends a command.
@@ -137,19 +136,14 @@
transceive_vector(); // transmit command.
- // clear transmit vector.
- for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+ clear_transmit_vector(); // clear transmit vector.
}
//----------------------------------------------//------------------------------
// returns the content of
// a CPU register.
char mmSPI::read_register(char cRegister)
{
- int dLoop;
-
-
- // send all 0.
- for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+ clear_transmit_vector(); // clear transmit vector.
transceive_vector(); // snap & scan-out reg contents.
@@ -158,17 +152,11 @@
//----------------------------------------------//------------------------------
void mmSPI::write_memory(char cHData, char cLdata, char cAddress)
{
- 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);
- write_register(0x02,cHData);
- write_register(0x01,cLdata);
+ clear_transmit_vector(); // clear transmit vector.
+
+ write_register(0x03,cAddress); // R3 <- address.
+ write_register(0x02,cHData); // R2 <- high-data.
+ write_register(0x01,cLdata); // R1 <- low-data.
pcSend[7] = 0x00; // write-enable high.
pcSend[1] = 0x02;
@@ -179,26 +167,20 @@
pcSend[1] = 0x00;
pcSend[0] = 0x00;
transceive_vector();
-
- // clear transmit vector.
- for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
-
+
+ clear_transmit_vector(); // clear transmit vector.
}
//----------------------------------------------//------------------------------
// fetch a word from main memory.
unsigned int mmSPI::read_memory(char cAddress)
- {
- 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;
+
+ clear_transmit_vector(); // clear transmit vector.
-
- // R3 <- address.
- write_register(0x03,cAddress);
+ write_register(0x03,cAddress); // R3 <= address.
pcSend[7] = 0x02; // mbed sends command.
pcSend[1] = 0xC8; // R2 <- MM[R3]
@@ -210,19 +192,23 @@
pcSend[0] = 0x00;
transceive_vector(); // send command.
- // obtain MM content.
- cHData = read_register(0x02);
- cLData = read_register(0x01);
+ cHData = read_register(0x02); // obtain MM high-data-byte.
+ cLData = read_register(0x01); // obtain MM low-data-byte.
udMemoryContent = (cHData << 8) + cLData; // build the memory word.
-
- // clear transmit vector.
- for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
+
+ clear_transmit_vector(); // clear transmit vector.
return udMemoryContent; // return the memory word.
}
//----------------------------------------------//------------------------------
+ void mmSPI::clear_transmit_vector(void) // fill transmit buffer with 0.
+ {
+ int dLoop;
+ for (dLoop = 0; dLoop < dNumBytes; dLoop++) pcSend[dLoop] = 0x00;
+ }
+//----------------------------------------------//------------------------------
@@ -236,5 +222,3 @@
-
-