SLAAEN5 February   2025 MSPM0G1106 , MSPM0G1107 , MSPM0G1506 , MSPM0G1507 , MSPM0G1518 , MSPM0G1519 , MSPM0G3106 , MSPM0G3106-Q1 , MSPM0G3107 , MSPM0G3107-Q1 , MSPM0G3506 , MSPM0G3506-Q1 , MSPM0G3507 , MSPM0G3507-Q1 , MSPM0G3518 , MSPM0G3518-Q1 , MSPM0G3519 , MSPM0G3519-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Bridge between CAN and SPI
  5. 2Implementation
    1. 2.1 Principle
    2. 2.2 Structure
  6. 3Software Description
    1. 3.1 Software Functionality
    2. 3.2 Configurable Parameters
    3. 3.3 Structure of Custom Element
    4. 3.4 Structure of FIFO
    5. 3.5 SPI Receive and Transmit (Transparent Transmission)
    6. 3.6 SPI Receive and Transmit (Protocol Transmission)
    7. 3.7 CAN Receive and Transmit
    8. 3.8 Application Integration
  7. 4Hardware
  8. 5Application Aspects
    1. 5.1 Flexible structure
    2. 5.2 Optional Configuration for SPI
    3. 5.3 Optional Configuration for CAN
    4. 5.4 CAN Bus Multinode Communication Example
  9. 6Summary
  10. 7References

3.4 Structure of FIFO

Custom_FIFO is the structure defined in user_define.h. The definition is also shown in Figure 2-6. 

typedef struct {
    uint16_t fifo_in;
    uint16_t fifo_out;
    uint16_t fifo_count;
    Custom_Element *fifo_pointer;
} Custom_FIFO;

gCan2Spi_FIFO and gSpi2Can_FIFO are defined in main.c. Note the usage of SRAM, which is related to C2S_FIFO_SIZE, S2C_FIFO_SIZE and the size for Custom_Element.

/* Variables for C2S_FIFO
 * C2S_FIFO is used to temporarily store message from CAN to SPI */
Custom_Element gC2S_FIFO[C2S_FIFO_SIZE];
Custom_FIFO gCan2Spi_FIFO = {0, 0, 0, gC2S_FIFO};

/* Variables for S2C_FIFO
 * S2C_FIFO is used to temporarily store message from SPI to CAN */
Custom_Element gS2C_FIFO[S2C_FIFO_SIZE];
Custom_FIFO gSpi2Can_FIFO = {0, 0, 0, gS2C_FIFO};