示例#1
0
文件: spi.c 项目: Merdosh/bitthunder
static BT_ERROR spiSetBaudrate(BT_HANDLE hSpi, BT_u32 ulBaudrate) {
	volatile LPC17xx_SPI_REGS *pRegs = hSpi->pRegs;

	const BT_RESOURCE *pResource = BT_GetIntegratedResource(hSpi->pDevice, BT_RESOURCE_ENUM, 0);

	BT_u32 ulInputClk = BT_LPC17xx_GetPeripheralClock(g_SPI_PERIPHERAL[pResource->ulStart]);

	if (pResource->ulStart == 0) {
		BT_u32 ulDivider = ulInputClk / ulBaudrate;
		if (ulDivider < 8) ulDivider = 8;
		if (ulDivider % 2) ulDivider++;
		pRegs->CCR = ulDivider;
	}
	else {
		pRegs->CR0 &= ~LPC17xx_SPI_CR0_SCR_MASK;

		BT_u32 ulDivider = (ulInputClk / ulBaudrate) / 256;

		if (ulDivider < 2) ulDivider = 2;
		if (ulDivider % 2) ulDivider++;

		pRegs->CPSR = ulDivider;
		pRegs->CR0 |= ((ulInputClk / (ulBaudrate * ulDivider)-1) << 8) & LPC17xx_SPI_CR0_SCR_MASK;
	}

	spiEnable(hSpi);
	return BT_ERR_NONE;
}
示例#2
0
文件: main.c 项目: kl80/nrf24le1prog
uint8_t readStatus() {
    uint8_t status;

    spiEnable();
    spiReadWriteByte(SPICMD_RDSR);
    status = spiReadWriteByte(0);
    spiDisable();

    return status;
}
示例#3
0
文件: main.c 项目: kl80/nrf24le1prog
usbMsgLen_t readMemory(uint16_t startAddr, uint16_t size) {
    spiEnable();

    spiReadWriteByte(SPICMD_READ);
    spiReadWriteByte(startAddr >> 8);
    spiReadWriteByte(startAddr);

    readBytesRemaining = size;
    reading = 1;

    return USB_NO_MSG;
}
示例#4
0
文件: main.c 项目: kl80/nrf24le1prog
usbMsgLen_t erasePage(uint8_t page) {
    if (page > 31) {
        return 0;
    }

    if (!waitForReady()) {
        return 0;
    }

    if (!enableWrite()) {
        return 0;
    }

    spiEnable();
    spiReadWriteByte(SPICMD_ERASEPAGE);
    spiReadWriteByte(page);
    spiDisable();

    waitWenIsCleared();

    return 0;
}
示例#5
0
文件: main.c 项目: kl80/nrf24le1prog
bool enableWrite() {
    uint8_t status;
    uint8_t attempts;

    for (attempts = 0; attempts < 10; ++attempts) {
        // set wren
        spiEnable();
        spiReadWriteByte(SPICMD_WREN);
        spiDisable();

        // then check that it's set
        status = readStatus();

        if (status & FSR_WEN) {
            return true;
        }

        _delay_ms(2);
    }

    return false;
}
示例#6
0
文件: main.c 项目: kl80/nrf24le1prog
uint8_t usbFunctionWrite(uint8_t *data, uint8_t len) {
    uint8_t i;
    uint16_t startAddr;

    if (reading) {
        return 1;
    }

    if (len > writeBytesRemaining) {
        len = writeBytesRemaining;
    }

    if (wrote == 0) {
        if (!enableWrite()) {
            return 0;
        }

        spiEnable();
        spiReadWriteByte(SPICMD_ERASEPAGE);
        spiReadWriteByte(currentPage);
        spiDisable();

        // wait WEN flag is cleared and flash is ready
        if (!waitWenIsCleared()) {
            return 0;
        }

        // enable WEN flag
        if (!enableWrite()) {
            return 0;
        }

        startAddr = currentPage * 512;

        // start writing
        spiEnable();
        spiReadWriteByte(SPICMD_PROGRAM);
        spiReadWriteByte(startAddr >> 8);
        spiReadWriteByte(startAddr);
    }

    for (i = 0; i < len; i++) {
        spiReadWriteByte(data[i]);
        wrote++;
    }

    writeBytesRemaining -= len;

    if (wrote == 512 || writeBytesRemaining == 0) {
        wrote = 0;
        spiDisable();
        waitWenIsCleared();

        ++currentPage;
    }

    if (writeBytesRemaining == 0) {
        return 1;
    }

    return 0;
}