MSP432 SD Card

This is an SD Card interface using the FatFs FAT/exFAT file system.

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Project Setup

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In order to use the project you will need to have the MSP432 SimpleLink SDK library installed. To install it follow the link and select the SIMPLELINK-MSP432-SDK option, after the installation is complete import this project into Code Composer's Workspace.

The SD card project is divided into two folders:

• Hardware: This folder contains all hardware peripheral code

• FatFs: This folder contains all of the source code for the FatFs file system

• Devices: This folder contains MSPIO

IMPORTANT: This project will require a serial terminal on a computer. Use your preferred serial terminals.

How to use it

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Include the following header files

#include <Hardware/SPI_Driver.h>
#include <Hardware/GPIO_Driver.h>
#include <Hardware/CS_Driver.h>
#include <Hardware/TIMERA_Driver.h>
#include <fatfs/ff.h>
#include <fatfs/diskio.h>
#include <Devices/MSPIO.h>

Initialize all the necessary hardware peripherals using the following configuration variables:

/* UART Configuration Parameter. These are the configuration parameters to
 * make the eUSCI A UART module to operate with a 115200 baud rate. These
 * values were calculated using the online calculator that TI provides
 * at:
 * http://software-dl.ti.com/msp430/msp430_public_sw/mcu/msp430/MSP430BaudRateConverter/index.html
 */
eUSCI_UART_Config UART0Config =
{
     EUSCI_A_UART_CLOCKSOURCE_SMCLK,
     13,
     0,
     37,
     EUSCI_A_UART_NO_PARITY,
     EUSCI_A_UART_LSB_FIRST,
     EUSCI_A_UART_ONE_STOP_BIT,
     EUSCI_A_UART_MODE,
     EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION
};

/* SPI Configuration Parameter. These are the configuration parameters to
 * make the eUSCI B SPI module to operate with a 500KHz clock.*/
eUSCI_SPI_MasterConfig SPI0MasterConfig =
{
     EUSCI_B_SPI_CLOCKSOURCE_SMCLK,
     3000000,
     500000,
     EUSCI_B_SPI_MSB_FIRST,
     EUSCI_B_SPI_PHASE_DATA_CHANGED_ONFIRST_CAPTURED_ON_NEXT,
     EUSCI_B_SPI_CLOCKPOLARITY_INACTIVITY_HIGH,
     EUSCI_B_SPI_3PIN
};

/* Timer_A UpMode Configuration Parameters */
Timer_A_UpModeConfig upConfig =
{
        TIMER_A_CLOCKSOURCE_SMCLK,              // SMCLK Clock Source
        TIMER_A_CLOCKSOURCE_DIVIDER_64,          // SMCLK/1 = 3MHz
        30000,                                  // 1 ms tick period
        TIMER_A_TAIE_INTERRUPT_DISABLE,         // Disable Timer interrupt
        TIMER_A_CCIE_CCR0_INTERRUPT_ENABLE ,    // Enable CCR0 interrupt
        TIMER_A_DO_CLEAR                        // Clear value
};

Declare the following File System variables:

FATFS FS;
DIR DI;
FILINFO FI;

Initialize the hardware for the SD card (SPI, GPIO and the TIMERA peripherals, UART is optional)

void main(void)
{
    WDT_A_holdTimer();

    CS_Init();

    /*Initialize all hardware required for the SD Card*/
    SPI_Init(EUSCI_B0_BASE, SPI0MasterConfig);
    UART_Init(EUSCI_A0_BASE, UART0Config);
    GPIO_Init(GPIO_PORT_P5, GPIO_PIN0);
    TIMERA_Init(TIMER_A1_BASE, UP_MODE, &upConfig, disk_timerproc);

    Interrupt_enableMaster();
  }

Mount the SD card and check if it succeeded

FRESULT r

/*First we should mount the SD Card into the Fatfs file system*/
r = f_mount(&FS, "0", 1);
/*Check for errors. Trap MSP432 if there is an error*/
if(r != FR_OK)
{
	MSPrintf(EUSCI_A0_BASE, "Error mounting SD Card, check your connections\r\n");
	while(1);
}

If your SD card was mounted properly then you are ready to read, write and create files. You can see the available API functions in the ff.h file, or click this link

Other Details and Future Work

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There is a weird bug whenever the directories and files are printed to the serial console. For some reason the names will get cut and they will not display properly. I am trying to fix this, but it is one of those bugs that will take days to track. If you can help with these I will appreciate it! 😃

The SPI communication interface is working without using interrupts, which is kind of bad. I plan to do an interrupt interface for SPI. Also it will be good to add DMA for files transfers between the MSP432 memory and FatFs file system.

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