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the spi2 works in master mode, and I set the spi2 clock(P03) with spiffyd_configure() function, write data with spiffyd_txData().
but the real frequency is always about 10MHZ.
the code is following :
void spiffy2_master_initialize(void)
{
// Use SPIFFY2 interface as master
spi2PortConfig.masterOrSlave = MASTER2_CONFIG;
// pull for MISO for master, MOSI/CLOCK/CS if slave mode
spi2PortConfig.pinPullConfig = INPUT_PIN_PULL_UP;
// Use P03 for CLK, P00 for MOSI and P01 for MISO
spi2PortConfig.spiGpioConfig = MASTER2_P03_CLK_P00_MOSI_P01_MISO;
// Initialize SPIFFY2 instance
spiffyd_init(SPIFFYD_2);
// Define this to the Port/Pin you want to use for CS.
// Port = P#/16 and PIN = P# % 16
// Configure the CS pin and deassert it initially.
// If enabling output, you only need to configure once. Use gpio_setPinOutput to toggle value being o/p
gpio_configurePin(SPI_CS_PORT, SPI_CS_PIN, GPIO_OUTPUT_ENABLE | GPIO_INPUT_DISABLE, 0);
// Configure the SPIFFY2 HW block
spiffyd_configure(SPIFFYD_2, SPI_SPEED, SPI_MSB_FIRST, SPI_SS_ACTIVE_LOW, SPI_MODE_3);
}
void writec(UINT8 data)
{
gpio_setPinOutput(SPI_CS_PORT, SPI_CS_PIN, 0);
gpio_setPinOutput(LCD_A0_PORT, LCD_A0_PIN, 0);
bleapputils_delayUs(1);
spiffyd_txData(SPIFFYD_2, 1 ,&data);
bleapputils_delayUs(1);
// gpio_setPinOutput(SPI_CS_PORT, SPI_CS_PIN, 1);
}
here is the oscillograph of the clock pin
Solved! Go to Solution.
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SPI
- Tags:
- spi speed
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the hw platform is BCM20737, and i change the clock pin from P03 to P24, it works well, thanks.
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Are you following the example shown in the WICED™ Smart Hardware Interfaces guide?
I know it states that the maximum SCLK speed supported by SPIFFY2 is 6 MHz at all IO supply voltages.
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the hw platform is BCM20737, and i change the clock pin from P03 to P24, it works well, thanks.