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Operating the SPI as a Master
Serial Peripheral Interface (SPI) 11-7
The following example shows the steps required to initialize the SPI as a master. The
master SPI drives the
SCLK signal. The assumptions underlying this example are:
■ IMM is a pointer to the MSC8101 registers in the PowerPC system bus address
spaces and is initialized to 0xF0000000.
■ SPIPRAM is a pointer to the SPI parameter RAM.
■ RxTxBD is a pointer to the buffer descriptors RxBD and TxBD.
■ One RxBD and one TxBD are used.
The steps in initializing the SPI as a master are as follows:
1. Configure port D for SPI.
In the master mode,
SPISEL is disabled while SPIMOSI, SPIMISO, and SPICLK are
enabled.
SPISEL must be configured as a GPIO. The PPARD, PDIRD, and
PSORD registers are configured as follows:
IMM->io_regs[PORT_D].ppar = 0x0000E000;
IMM->io_regs[PORT_D].pdir = 0x00001000;
IMM->io_regs[PORT_D].psor = 0x0000F000;
2. Assign a pointer to the SPI parameter RAM.
At location IMM + 0x89FC, SPI_BASE points to the SPI parameter RAM area,
which can be placed at any 64-byte aligned address in the dual-port RAM’s
general-purpose area (Banks 1–8 are located at IMM + 0x0 through IMM +
0x3FFF). In this example, assume that the SPI parameter RAM area resides in
Bank 8 at IMM + 0x3800.
IMM->pram.standard.spi[0] = 0x38;
IMM->pram.standard.spi[1] = 0x00;
3. Configure RBASE and TBASE.
Assume that there is one RxBD followed by one TxBD at the beginning of the
dual-port RAM and the RxBD starts at IMM+0. Since each buffer descriptor is
8-bytes, the TxBD starts at IMM+8.
SPIPRAM->rbase = 0x0000;
SPIPRAM->tbase = 0x0008;
4. Configure RFCR and TFCR.
SPIRAM->rfcr = 0x10;
SPIRAM->tfcr = 0x10;
5. Configure MRBLR.
Assume the maximum bytes per receive buffer is 16 bytes.
SPIRAM->mrblr = 0x0010;
- MSC8101 USER’S GUIDE 1
- How to reach us: 2
- 1-303-675-2140 2
- 1-800-441-2447 2
- Chapter 5 7
- Chapter 11 10
- Chapter 12 10
- EOnCE/JTAG 10
- Contents 11
- MSC8101 User’s Guide xi 11
- MSC8101 User’s Guide xiii 13
- MSC8101 User’s Guide xv 15
- MSC8101 User’s Guide xvii 17
- About This Book 19
- Audience and Helpful Hints 20
- Organization 21
- Other MSC8101 Documentation 23
- Further Reading 23
- Chapter 1 25
- MSC8101 Overview 25
- 1.2 Features 26
- 1.2.2 On-Device Memories 27
- 1.2.5 System Interface Unit 27
- 1.2.6 On-Device Peripherals 28
- 1.2.7 DMA Engine 28
- 1.3 Architecture 30
- 1.3.2 SRAM 31
- 1-8 MSC8101 User’s Guide 32
- Extended Core 32
- 1.3.4 DMA Controller 33
- Offset 0123456789101112131415 37
- 0x0 Status and Control 37
- 0x2 Data Length 37
- 0x4 High-Order Buffer Pointer 37
- 0x6 Low-Order Buffer Pointer 37
- MSC8101 Reference Manual 38
- Architecture 39
- MSC8101 Overview 1-15 39
- Table 1-6. SCC Parameter RAM 40
- MSC8101 Overview 1-17 41
- 1-18 MSC8101 User’s Guide 42
- MSC8101 Overview 1-19 43
- 1-20 MSC8101 User’s Guide 44
- Centralized DSP Architecture 48
- MSC8101 Application Examples 49
- MSC8101 Overview 1-25 49
- Serial Backplane 49
- 1.5 Software Development 50
- Software Development 51
- MSC8101 Overview 1-27 51
- 1-28 MSC8101 User’s Guide 52
- Chapter 2 53
- Reset Configuration and Boot 53
- 2.1.1 Bootloader Program 54
- 2.1.2 Clocks 54
- Connected 59
- Address Bus 60
- Data Bus 60
- BTM[0–1]/EE[4–5] 63
- Host Port 64
- 2-16 MSC8101 User’s Guide 68
- 2.5 Related Reading 69
- 2-18 MSC8101 User’s Guide 70
- Chapter 3 71
- 3.2 Partitioning Memory 72
- 3.3 Allocating Memory 72
- 3.5 Related Reading 75
- 3-6 MSC8101 User’s Guide 76
- Chapter 4 77
- Memory-Mapped Devices 77
- 4.2 External Bus Basics 78
- AM29LV160D 80
- 2MB Flash 80
- 01234 0567 9EHTR8 81
- 01234 05678910 82
- Table 4-1. GPCM ORx Settings 83
- READ, WRITE, and PRECHARGE 85
- ACTIVATE command 85
- 4-10 MSC8101 User’s Guide 86
- CAS latency = 2, Last Data 86
- 4-12 MSC8101 User’s Guide 88
- Multiplex 89
- 4-14 MSC8101 User’s Guide 90
- GPL2 is programmed high in a 91
- CSx = HCS 94
- 4.6 Related Reading 95
- 4-20 MSC8101 User’s Guide 96
- System and Local Buses 97
- 5.1 PowerPC System Bus 98
- PowerPC System Bus 99
- QBus Switch 99
- 5.2 PowerPC Local Bus 100
- 5.3 Bus Interaction 101
- Figure 5-6. Bus Architecture 102
- 5.3.1 DMA Controller 104
- 5.3.2 SDMA Channels 105
- Figure 5-8. SDMA Data Paths 106
- 5.4 Related Reading 107
- 5-12 MSC8101 User’s Guide 108
- Chapter 6 109
- DMA Channels 109
- 6.1.1 Operating Modes 110
- 6.1.2 Transfer Types 111
- External 112
- 6.2 Initializing the DMA 115
- Table 6-2. DCHCRx Bits 116
- Table 6-3. DCPRAM Addressing 117
- 6-10 MSC8101 User’s Guide 118
- 6.2.6 FIFO Requests 120
- 6.2.9 Interrupts 121
- These signals are: 122
- (DMA request) 122
- (DMA acknowledge) 122
- 6-16 MSC8101 User’s Guide 124
- from the vector base 132
- 6.6 Related Reading 134
- Chapter 7 135
- PERIPH_IR 137
- 7.3.4 Routing Interrupts 140
- 0x0 TRAP 141
- 7.4.1 PIC Programming 143
- 7.4.4 PIC Macros 147
- Chapter 8 153
- Host Interface (HDI16) 153
- 8.1.1 Host-Side Model 154
- 8.1.2 DSP-Side Model 155
- 8.2.1 Normal Mode 157
- 8-6 MSC8101 User’s Guide 158
- 8.2.2 Host DMA Mode 160
- Host Interface (HDI16) 8-9 161
- HDM0 is 161
- HPCR[15]:OAD Data Valid 162
- 0 HACK pin is asserted 162
- Figure 8-3 163
- 8-12 MSC8101 User’s Guide 164
- 8.3.1 Software Polling 165
- 8.3.2 DSP Interrupts 167
- Table 8-16. PIC Interrupts 168
- Host Interface (HDI16) 8-17 169
- 8.3.3 Host Requests 170
- Host Interface (HDI16) 8-19 171
- Host Interface (HDI16) 8-21 173
- 8-22 MSC8101 User’s Guide 174
- Host Interface (HDI16) 8-23 175
- 8.5 Related Reading 176
- Chapter 9 177
- 9-2 MSC8101 User’s Guide 178
- 9-4 MSC8101 User’s Guide 180
- 9.2.2 Complex Mode 181
- 9.2.4 Magnitude Mode 182
- 9-8 MSC8101 User’s Guide 184
- 9.4.1 Rounding 185
- 9-10 MSC8101 User’s Guide 186
- 9.5.1 Polling 187
- 9.5.2 Interrupts 188
- 9.5.3 DMA 189
- 9.6 Programming Examples 190
- FCNT/2 complex 191
- 9-20 MSC8101 User’s Guide 196
- FDOR_ADDR, is written to the 197
- NSAMP/4 data samples are 197
- Programming Examples 199
- 9.7 Related Reading 201
- 9-26 MSC8101 User’s Guide 202
- Chapter 10 203
- 10.1.2 Driver Memory Map 206
- 10.1.3 Memory Usage 207
- × 64 Kbps slots 208
- 10-8 MSC8101 User’s Guide 210
- Figure 10-7. Loopback Modes 211
- × 8), thus creating a 211
- 10.3 Configure the Channels 212
- 0x3800 is used 213
- 10-14 MSC8101 User’s Guide 216
- CLK15 pin 217
- BRG50 pin must be 217
- 10.6 Related Reading 218
- 11.2 Setting the Clock 221
- 11-4 MSC8101 User’s Guide 222
- Operating the SPI as a Master 223
- Figure 11-3. SPI as a Master 224
- 11-8 MSC8101 User’s Guide 226
- Figure 11-4. SPI as Slave 227
- Operating the SPI as a Slave 229
- 11.7 Related Reading 231
- 11-14 MSC8101 User’s Guide 232
- 12-2 MSC8101 User’s Guide 234
- 12.1.1 Instructions 235
- 12-4 MSC8101 User’s Guide 236
- 12.1.3 Registers 237
- 12-6 MSC8101 User’s Guide 238
- EOnCE/JTAG Basics 239
- EOnCE/JTAG 12-7 239
- 12-8 MSC8101 User’s Guide 240
- EOnCE/JTAG 12-9 241
- 12.1.3.1 CORE_CMD Example 1 242
- 12.1.3.2 CORE_CMD Example 2 242
- 12.1.3.3 CORE_CMD Example 3 242
- EOnCE/JTAG 12-11 243
- 12-12 MSC8101 User’s Guide 244
- EOnCE/JTAG 12-13 245
- 12-14 MSC8101 User’s Guide 246
- Figure 12-8. Writing to ERCV 247
- 12.7 Downloading Software 248
- Downloading Software 249
- EOnCE/JTAG 12-17 249
- 12-18 MSC8101 User’s Guide 250
- EOnCE/JTAG 12-19 251
- 12.10 Counting Core Cycles 252
- Counting Core Cycles 253
- EOnCE/JTAG 12-21 253
- 12.11 Related Reading 254
- Appendix A 255
- Programming Reference 255
- A-2 MSC8101 User’s Guide 256
- MSC8101 User’s Guide A-3 257
- A-4 MSC8101 User’s Guide 258
- MSC8101 User’s Guide A-5 259
- A-6 MSC8101 User’s Guide 260
- A.2 Programming Sheets 261
- SYSTEM INTERFACE UNIT 262
- Address: 0x10240 263
- Reset: 0 263
- Read/Write 263
- Address: 0x10220 267
- MEMORY CONTROLLER 268
- BR[0–7, 10, 11] 268
- OR[0–7, 10, 11] 269
- MAMR, MBMR, MCMR 272
- INTERRUPT SCHEME 275
- SICR/SICR_EXT 278
- SIEXR/SIEXR_EXT 278
- DIRECT MEMORY ACCESS 279
- DCHCR[0–15] 281
- ENHANCED FILTER 283
- COPROCESSOR 283
- Address: 0x0C80 284
- Host Control Register 286
- Address: 0x0000 286
- Hardware Reset: 0 286
- HCR (HICR=1) 287
- HOST INTERFACE 287
- Host Port Control Register 288
- Address: 0x0020 288
- ICR (DMA=0, DMA=1, HICR=0) 289
- ICR (DMA=0, DMA=1, HICR=1) 290
- Appendix B 291
- Glossary 291
- Glossary Appendix B-3 293
- Debug mode 295
- DSP MIPs 296
- Glossary Appendix B-7 297
- FC-PBGA 298
- Glossary Appendix B-9 299
- Glossary Appendix B-11 301
- Glossary Appendix B-13 303
- TXD, RXD, and SMSYN 303
- Glossary Appendix B-15 305
- Glossary Appendix B-17 307
- Appendix C 309
- Bootloader Program 309
- 0x80 310
- 0 310
- 0x100 310
- 0x180 310
- long instead of bytes 313
- C-16 MSC8101 User’s Guide 324
- Appendix D 325
- Acronyms and Abbreviations 325
- D-2 MSC8101 User’s Guide 326
- Flip Chip-Plastic Ball Grid 327
- Array package 327
- D-4 MSC8101 User’s Guide 328
- MSC8101 User’s Guide D-5 329
- D-6 MSC8101 User’s Guide 330
- MSC8101 User’s Guide D-7 331
- D-8 MSC8101 User’s Guide 332
- MSC8101 User’s Guide D-9 333
- D-10 MSC8101 User’s Guide 334
- Numerics 335
- , 1-4, 1-22, 4-2, 5-3 339
- SET command 4-7 342
- -ALL-BANKS command 4-7 344
- , 10-1, 10-8 346
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