Example description
This example describes how to use SSP in POLLING, INTERRUPT or DMA mode. It is needed to connect 2 hardware boards, one for Master and one for Slave.
SSP configuration:<br>
- CPHA = 0: data is sampled on the first clock edge of SCK.<br>
- CPOL = 0: SCK is active high.<br>
- Sample rate = 400kHz.<br>
- DSS = 8: 8 bits per transfer.<br>
- FRF= 0: SPI Frame format.<br>
After initialize transmit buffer, SPI master/slave will transfer a number of bytes
to SPI slave/master and receive data concurrently.<br>
After a transfer completed, receive and transmit buffer will be compared and
the result will be print out via UART port.<br>
This example supports 3 transfer modes: POLLING mode, INTERRUPT mode and DMA mode.<br>
- Connect UART port on the master board and slave board to COM ports on your PC.
- Configure terminal program on the PC per the above Serial display configuration
- Configure hardware, connect master board and slave board as below
- Build and run the example. Following guidance on terminals of master and slave to do test.
Special connection requirements
How to run: hardware configuration
- Embedded Artists' LPC1788 Developer's Kit
- SSP0 connection:
- P0.15: SSP0_SCK J5.19
- P0.16: SSP0_SSEL J3.24
- P0.17: SSP0_MISO J5.20
- P0.18: SSP0_MOSI J3.23
- SSP1 connection:
- P0.7: SSP1_SCK J5.17
- P0.6 : SSP1_SSEL J3.18
- P0.8: SSP1_MISO J3.19
- P0.9: SSP1_MOSI J5.18
- Embedded Artists' LPC4088 Developer's Kit
- SSP1 connection:
- P0.7: SSP1_SCK J5.17
- P0.6: SSP1_SSEL J3.18
- P0.8: SSP1_MISO J3.19
- P0.9: SSP1_MOSI J5.18
- SSP2 connection:
- P5.2: SSP2_SCK J5.19
- P5.3: SSP2_SSEL J3.24
- P5.1: SSP2_MISO J5.20
- P5.0: SSP2_MOSI J3.23
Remove jumpers on JP24~JP27 when SSP1 is used.
- LPCXpresso LPC1769:
- SSP0 connection:
- P2.1: SSP1_SCK
- P2.2: SSP1_SSEL
- P2.0: SSP1_MISO
- P0.7: SSP1_MOSI
- SSP1 connection:
- P2.11: SSP1_SCK
- P0.2: SSP1_SSEL
- P0.8: SSP1_MISO
- P0.9: SSP1_MOSI
Need to connect with base board for using RS232/UART port.
Common ground must be connected together between two boards.
Build procedures:
LPC17xx/40xx example quickstart for Keil uVision4
LPC17xx/40xx example quickstart for IAR EWARM
LPC17xx/40xx example quickstart for Code Red Xpresso
Supported boards and board setup:
Embedded Artists' LPC1788 Developer's Kit
Embedded Artists' LPC4088 Developer's Kit
NXP Xpresso LPC1769 board
Submitting LPCOpen issues:
Community support for LPCOpen
| #define BUFFER_SIZE (0x100) |
| #define SSP_DATA_BIT_NUM |
( |
|
databits | ) |
(databits + 1) |
| #define SSP_DATA_BYTES |
( |
|
databits | ) |
(((databits) > SSP_BITS_8) ? 2 : 1) |
| #define SSP_DMA_SEL (0x33) |
| #define SSP_HI_BYTE_MSK |
( |
|
databits | ) |
|
Value:
Definition at line 129 of file ssp.c.
| #define SSP_INTERRUPT_SEL (0x32) |
| #define SSP_IRQ SSP1_IRQn |
| #define SSP_LO_BYTE_MSK |
( |
|
databits | ) |
|
Value:
Definition at line 127 of file ssp.c.
| #define SSP_MASTER_MODE_SEL (0x31) |
| #define SSP_MODE_SEL (0x31) |
| #define SSP_POLLING_SEL (0x31) |
| #define SSP_SLAVE_MODE_SEL (0x32) |
| #define SSP_TRANSFER_MODE_SEL (0x32) |
| #define SSPIRQHANDLER SSP1_IRQHandler |
| static void appSSPMainMenu |
( |
void |
| ) |
|
|
static |
| static void appSSPSelectModeMenu |
( |
void |
| ) |
|
|
static |
| static void appSSPTest |
( |
void |
| ) |
|
|
static |
| static void Buffer_Init |
( |
void |
| ) |
|
|
static |
| static uint8_t Buffer_Verify |
( |
void |
| ) |
|
|
static |
| void DMA_IRQHandler |
( |
void |
| ) |
|
DMA interrupt handler sub-routine. Set the waiting flag when transfer is successful.
- Returns
- Nothing
Definition at line 425 of file ssp.c.
Main routine for SSP example.
Main program body.
- Returns
- Nothing
Definition at line 440 of file ssp.c.
| void SSPIRQHANDLER |
( |
void |
| ) |
|
SSP interrupt handler sub-routine.
- Returns
- Nothing
Definition at line 403 of file ssp.c.
| volatile uint8_t isDmaRxfCompleted = 0 |
|
static |
| volatile uint8_t isDmaTxfCompleted = 0 |
|
static |
| volatile uint8_t isXferCompleted = 0 |
|
static |
1.8.2