Mike Moore
SPI library used to communicate with an altera development board attached to four zigbee-header pins.
Diff: mmSPI.cpp
- Revision:
- 21:e90dd0f8aaa1
- Parent:
- 20:2d5cd38047ca
- Child:
- 22:7524dee5c753
diff -r 2d5cd38047ca -r e90dd0f8aaa1 mmSPI.cpp
--- a/mmSPI.cpp Mon Aug 19 23:14:36 2013 +0000
+++ b/mmSPI.cpp Tue Aug 20 14:02:56 2013 +0000
@@ -50,60 +50,6 @@
fSPIquarterP = (1 / fSPIfreq) / 4; // figure quarter-cycle period.
}
//----------------------------------------------//------------------------------
-// we're not going for speed, so lets go for good setup / hold.
-
- // send/receive a byte over SPI.
- // MSB out/in first.
- void mmSPI::transceive_byte(char *cReceive, char *cSend)
- {
- *cReceive = 0; // clear receive byte.
- for (dLoop01 = 7; dLoop01 >= 0; dLoop01--)// loop for 8 bits in the byte.
- {
- *pSCLK = 0; // SPI clock negedge.
- wait(fSPIquarterP); // until middle of clock low.
- *pMOSI = (*cSend >> dLoop01) & 1; // assert MOSI.
- // capture MISO.
- *cReceive = *cReceive | (*pMISO << dLoop01);
- wait(fSPIquarterP); // finish-out cycle.
- *pSCLK = 1; // SPI clock posedge.
- wait(fSPIquarterP); // finish-out cycle.
- wait(fSPIquarterP); // finish-out cycle.
- }
- }
-//----------------------------------------------//------------------------------
- // transceive a character array.
- // limit is 256 characters.
- // MSB out/in first.
- void mmSPI::transceive_vector(char *cReceive, char *cSend, char cNumBytes)
- {
-
-
-
- for (dLoop02 = (cNumBytes - 1); dLoop02 >= 0; dLoop02--)
- transceive_byte(&(cReceive[dLoop02]), &(cSend[dLoop02]));
-
-
-
- *pCPUclk = 1; // pulse the CPU clock.
- wait(fSPIquarterP);
- wait(fSPIquarterP);
- *pCPUclk = 0;
- wait(fSPIquarterP);
- wait(fSPIquarterP);
-
-
-
- if (0)
- {
- *pSCLK = 1;
- wait(fSPIquarterP);
- wait(fSPIquarterP);
- *pSCLK = 0;
- wait(fSPIquarterP);
- wait(fSPIquarterP);
- }
- }
-//----------------------------------------------//------------------------------
// transceive a character array.
// limit is 256 characters.
// MSB out/in first.
@@ -159,94 +105,6 @@
}
}
//----------------------------------------------//------------------------------
- // transceive a character array.
- // limit is 256 characters.
- // MSB out/in first.
- void mmSPI::test_toggle_cpu_clock(void)
- {
- DigitalOut led0(LED4);
- while (1)
- {
- *pCPUclk = 1; led0 = 1;
- wait(1.0);
- *pCPUclk = 0; led0 = 0;
- wait(1.0);
- }
- }
-//----------------------------------------------//------------------------------
- void mmSPI::force_write(char cDataHIgh, char cDataLow, char cAddress)
- {
- char pcReceive[8];
- char pcSend [8];
- int dLoop;
-
- for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0;
-
-
- // high data to R2.
- pcSend[7] = 0x02; pcSend[1] = 0xA8; pcSend[0] = cDataHIgh;
- transceive_vector(pcReceive, pcSend, 8);
-
-
- // low data to R1.
- pcSend[7] = 0x02; pcSend[1] = 0xA4; pcSend[0] = cDataLow;
- transceive_vector(pcReceive, pcSend, 8);
-
-
- // address to R3.
- pcSend[7] = 0x02; pcSend[1] = 0xAC; pcSend[0] = cAddress;
- transceive_vector(pcReceive, pcSend, 8);
-
-
-
- pcSend[7] = 0x02; pcSend[1] = 0x02; pcSend[0] = 0; // WE high.
- transceive_vector(pcReceive, pcSend, 8);
-
- pcSend[7] = 0x02; pcSend[1] = 0x00; pcSend[0] = 0; // WE low.
- transceive_vector(pcReceive, pcSend, 8);
-
- }
-//----------------------------------------------//------------------------------
-
- void mmSPI::force_read(char cAddress)
- {
- char pcReceive[8];
- char pcSend [8];
- int dLoop;
-
- for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0;
-
-
-
-
- // address to R3.
- pcSend[7] = 0x02; pcSend[1] = 0xAC; pcSend[0] = cAddress;
- transceive_vector(pcReceive, pcSend, 8);
-
- // R2 gets data-H from memory.
- pcSend[7] = 0x02; pcSend[1] = 0xC8; pcSend[0] = cAddress;
- transceive_vector(pcReceive, pcSend, 8);
-
- // R1 gets data-L from memory.
- pcSend[7] = 0x02; pcSend[1] = 0xC4; pcSend[0] = cAddress;
- transceive_vector(pcReceive, pcSend, 8);
-
-
-
-
- // pcSend[7] = 0x02; // force IR.
-// pcSend[1] = 0xA4; // R1 <- immediate.
-// pcSend[0] = 0xEE; // immediate value.
- /// transceive_vector(pcReceive, pcSend, 8);
-
-
-
- // no-op scan.
- pcSend[7] = 0x02; pcSend[1] = 0x0; pcSend[0] = 0;
- transceive_vector(pcReceive, pcSend, 8);
-
- }
-//----------------------------------------------//------------------------------
void mmSPI::write_register(char cRegister, char cValue, char * pcReceive, char * pcSend)
{
int dLoop; // loop index.
@@ -271,11 +129,9 @@
char mmSPI::read_register(char cRegister, char * pcReceive, char * pcSend)
{
int dLoop;
- // int dComplement;
+
- // dComplement = 7 - (int) cRegister;
-
- // send all 0.
+ // send all 0.
for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
transceive_vector2(pcReceive, pcSend, 8); // snap & scan-out reg contents.
@@ -290,18 +146,6 @@
// clear transmit vector.
for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
- /*
- CTRL = 7
- R0 = 6
- R1 = 5
- R2 = 4
- R3 = 3
- PC = 2
- IR-H = 1
- IR-L = 0
-*/
-
-
// R3 <- address.
// R2 <- high-data.
// R1 <- low-data.
@@ -334,19 +178,7 @@
// clear transmit vector.
for (dLoop = 0; dLoop < 8; dLoop++) pcSend[dLoop] = 0x00;
-
- /*
- CTRL = 7
- R0 = 6
- R1 = 5
- R2 = 4
- R3 = 3
- PC = 2
- IR-H = 1
- IR-L = 0
-*/
-
-
+
// R3 <- address.
write_register(0x03,cAddress, pcReceive, pcSend);
@@ -376,28 +208,6 @@
//----------------------------------------------//------------------------------
- void mmSPI::write_pulse(char * pcReceive, char * 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);
-
- pcSend[7] = 0x00;
- pcSend[6] = 0x00;
- pcSend[5] = 0x00;
- pcSend[4] = 0x00;
- pcSend[3] = 0x00;
- pcSend[2] = 0x00;
- pcSend[1] = 0x00;
- pcSend[0] = 0x00;
- }
-//----------------------------------------------//------------------------------
@@ -411,4 +221,3 @@
-