Merge pull request #598 from lab11/spi-flush2
[SPI + CC2538] Update the SPI driver for CC2538
This commit is contained in:
George Oikonomou
commit
db754a57d7
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@ -82,10 +82,11 @@ void spi_init(void);
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} while(0)
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/* Flush the SPI read register */
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#ifndef SPI_FLUSH
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#define SPI_FLUSH() \
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do { \
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SPI_RXBUF; \
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} while(0);
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#endif
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#endif /* SPI_H_ */
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@ -48,23 +48,6 @@
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#define SPI_MOSI_PIN_MASK GPIO_PIN_MASK(SPI_MOSI_PIN)
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#define SPI_MISO_PORT_BASE GPIO_PORT_TO_BASE(SPI_MISO_PORT)
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#define SPI_MISO_PIN_MASK GPIO_PIN_MASK(SPI_MISO_PIN)
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#define SPI_SEL_PORT_BASE GPIO_PORT_TO_BASE(SPI_SEL_PORT)
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#define SPI_SEL_PIN_MASK GPIO_PIN_MASK(SPI_SEL_PIN)
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/* Default: Motorola mode 3 with 8-bit data words */
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#ifndef SPI_CONF_PHASE
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#define SPI_CONF_PHASE SSI_CR0_SPH
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#endif
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#ifndef SPI_CONF_POLARITY
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#define SPI_CONF_POLARITY SSI_CR0_SPO
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#endif
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#ifndef SPI_CONF_DATA_SIZE
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#define SPI_CONF_DATA_SIZE 8
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#endif
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#if SPI_CONF_DATA_SIZE < 4 || SPI_CONF_DATA_SIZE > 16
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#error SPI_CONF_DATA_SIZE must be set between 4 and 16 inclusive.
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#endif
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/**
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* \brief Initialize the SPI bus.
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@ -73,12 +56,11 @@
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* SPI_CLK_PORT SPI_CLK_PIN
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* SPI_MOSI_PORT SPI_MOSI_PIN
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* SPI_MISO_PORT SPI_MISO_PIN
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* SPI_SEL_PORT SPI_SEL_PIN
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*
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* This sets the mode to Motorola SPI with the following format options:
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* SPI_CONF_PHASE: 0 or SSI_CR0_SPH
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* SPI_CONF_POLARITY: 0 or SSI_CR0_SPO
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* SPI_CONF_DATA_SIZE: 4 to 16 bits
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* Clock phase: 1; data captured on second (rising) edge
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* Clock polarity: 1; clock is high when idle
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* Data size: 8 bits
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*/
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void
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spi_init(void)
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@ -95,31 +77,42 @@ spi_init(void)
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ioc_set_sel(SPI_CLK_PORT, SPI_CLK_PIN, IOC_PXX_SEL_SSI0_CLKOUT);
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ioc_set_sel(SPI_MOSI_PORT, SPI_MOSI_PIN, IOC_PXX_SEL_SSI0_TXD);
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REG(IOC_SSIRXD_SSI0) = (SPI_MISO_PORT * 8) + SPI_MISO_PIN;
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ioc_set_sel(SPI_SEL_PORT, SPI_SEL_PIN, IOC_PXX_SEL_SSI0_FSSOUT);
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/* Put all the SSI gpios into peripheral mode */
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GPIO_PERIPHERAL_CONTROL(SPI_CLK_PORT_BASE, SPI_CLK_PIN_MASK);
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GPIO_PERIPHERAL_CONTROL(SPI_MOSI_PORT_BASE, SPI_MOSI_PIN_MASK);
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GPIO_PERIPHERAL_CONTROL(SPI_MISO_PORT_BASE, SPI_MISO_PIN_MASK);
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GPIO_PERIPHERAL_CONTROL(SPI_SEL_PORT_BASE, SPI_SEL_PIN_MASK);
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/* Disable any pull ups or the like */
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ioc_set_over(SPI_CLK_PORT, SPI_CLK_PIN, IOC_OVERRIDE_DIS);
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ioc_set_over(SPI_MOSI_PORT, SPI_MOSI_PIN, IOC_OVERRIDE_DIS);
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ioc_set_over(SPI_MISO_PORT, SPI_MISO_PIN, IOC_OVERRIDE_DIS);
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ioc_set_over(SPI_SEL_PORT, SPI_SEL_PIN, IOC_OVERRIDE_DIS);
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/* Configure the clock */
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REG(SSI0_BASE + SSI_CPSR) = 2;
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/* Put the ssi in Motorola SPI mode using the provided format options */
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REG(SSI0_BASE + SSI_CR0) = SPI_CONF_PHASE | SPI_CONF_POLARITY | (SPI_CONF_DATA_SIZE - 1);
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/* Configure the default SPI options.
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* mode: Motorola frame format
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* clock: High when idle
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* data: Valid on rising edges of the clock
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* bits: 8 byte data
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*/
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REG(SSI0_BASE + SSI_CR0) = SSI_CR0_SPH | SSI_CR0_SPO | (0x07);
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/* Enable the SSI */
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REG(SSI0_BASE + SSI_CR1) |= SSI_CR1_SSE;
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}
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/*---------------------------------------------------------------------------*/
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void
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spi_cs_init(uint8_t port, uint8_t pin)
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{
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GPIO_SOFTWARE_CONTROL(GPIO_PORT_TO_BASE(port), GPIO_PIN_MASK(pin));
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ioc_set_over(port, pin, IOC_OVERRIDE_DIS);
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GPIO_SET_OUTPUT(GPIO_PORT_TO_BASE(port), GPIO_PIN_MASK(pin));
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GPIO_SET_PIN(GPIO_PORT_TO_BASE(port), GPIO_PIN_MASK(pin));
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}
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/*---------------------------------------------------------------------------*/
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void
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spi_enable(void)
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{
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/* Enable the clock for the SSI peripheral */
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@ -132,4 +125,16 @@ spi_disable(void)
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/* Gate the clock for the SSI peripheral */
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REG(SYS_CTRL_RCGCSSI) &= ~1;
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}
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/*---------------------------------------------------------------------------*/
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void spi_set_mode(uint32_t frame_format, uint32_t clock_polarity, uint32_t clock_phase, uint32_t data_size)
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{
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/* Disable the SSI peripheral to configure it */
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REG(SSI0_BASE + SSI_CR1) = 0;
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/* Configure the SSI options */
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REG(SSI0_BASE + SSI_CR0) = clock_phase | clock_polarity | frame_format | (data_size - 1);
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/* Re-enable the SSI */
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REG(SSI0_BASE + SSI_CR1) |= SSI_CR1_SSE;
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}
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/** @} */
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@ -74,98 +74,106 @@
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*/
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#define SSI_CR0_SCR_M 0x0000FF00 /**< Serial clock rate mask */
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#define SSI_CR0_SCR_S 8 /**< Serial clock rate shift */
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#define SSI_CR0_SPH 0x00000080 /**< Serial clock phase (H) */
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#define SSI_CR0_SPH_M 0x00000080 /**< Serial clock phase (H) mask */
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#define SSI_CR0_SPH_S 7 /**< Serial clock phase (H) shift */
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#define SSI_CR0_SPO 0x00000040 /**< Serial clock phase (O) */
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#define SSI_CR0_SPO_M 0x00000040 /**< Serial clock phase (O) mask */
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#define SSI_CR0_SPO_S 6 /**< Serial clock phase (O) shift */
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#define SSI_CR0_FRF_M 0x00000030 /**< Frame format select mask */
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#define SSI_CR0_FRF_S 4 /**< Frame format select shift */
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#define SSI_CR0_DSS_M 0x0000000F /**< Data size select mask */
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#define SSI_CR0_DSS_S 0 /**< Data size select shift */
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#define SSI_CR1_SOD 0x00000008 /**< Slave mode output disable */
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#define SSI_CR1_SOD_M 0x00000008 /**< Slave mode output disable mask */
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#define SSI_CR1_SOD_S 3 /**< Slave mode output disable shift */
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#define SSI_CR1_MS 0x00000004 /**< Master and slave select */
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#define SSI_CR1_MS_M 0x00000004 /**< Master and slave select mask */
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#define SSI_CR1_MS_S 2 /**< Master and slave select shift */
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#define SSI_CR1_SSE 0x00000002 /**< Synchronous serial port enable */
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#define SSI_CR1_SSE_M 0x00000002 /**< Synchronous serial port enable mask */
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#define SSI_CR1_SSE_S 1 /**< Synchronous serial port enable shift */
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#define SSI_CR1_LBM 0x00000001 /**< Loop-back mode */
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#define SSI_CR1_LBM_M 0x00000001 /**< Loop-back mode mask */
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#define SSI_CR1_LBM_S 0 /**< Loop-back mode shift */
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#define SSI_DR_DATA_M 0x0000FFFF /**< FIFO data mask */
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#define SSI_DR_DATA_S 0 /**< FIFO data shift */
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#define SSI_SR_BSY 0x00000010 /**< Busy bit */
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#define SSI_SR_BSY_M 0x00000010 /**< Busy bit mask */
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#define SSI_SR_BSY_S 4 /**< Busy bit shift */
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#define SSI_SR_RFF 0x00000008 /**< Receive FIFO full */
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#define SSI_SR_RFF_M 0x00000008 /**< Receive FIFO full mask */
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#define SSI_SR_RFF_S 3 /**< Receive FIFO full shift */
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#define SSI_SR_RNE 0x00000004 /**< Receive FIFO not empty */
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#define SSI_SR_RNE_M 0x00000004 /**< Receive FIFO not empty mask */
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#define SSI_SR_RNE_S 2 /**< Receive FIFO not empty shift */
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#define SSI_SR_TNF 0x00000002 /**< Transmit FIFO not full */
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#define SSI_SR_TNF_M 0x00000002 /**< Transmit FIFO not full mask */
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#define SSI_SR_TNF_S 1 /**< Transmit FIFO not full shift */
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#define SSI_SR_TFE 0x00000001 /**< Transmit FIFO empty */
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#define SSI_SR_TFE_M 0x00000001 /**< Transmit FIFO empty mask */
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#define SSI_SR_TFE_S 0 /**< Transmit FIFO empty shift */
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#define SSI_CPSR_CPSDVSR_M 0x000000FF /**< Clock prescale divisor mask */
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#define SSI_CPSR_CPSDVSR_S 0 /**< Clock prescale divisor shift */
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#define SSI_IM_TXIM 0x00000008 /**< Transmit FIFO interrupt mask */
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#define SSI_IM_TXIM_M 0x00000008 /**< Transmit FIFO interrupt mask mask */
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#define SSI_IM_TXIM_S 3 /**< Transmit FIFO interrupt mask shift */
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#define SSI_IM_RXIM 0x00000004 /**< Receive FIFO interrupt mask */
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#define SSI_IM_RXIM_M 0x00000004 /**< Receive FIFO interrupt mask mask */
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#define SSI_IM_RXIM_S 2 /**< Receive FIFO interrupt mask shift */
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#define SSI_IM_RTIM 0x00000002 /**< Receive time-out interrupt mask */
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#define SSI_IM_RTIM_M 0x00000002 /**< Receive time-out interrupt mask mask */
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#define SSI_IM_RTIM_S 1 /**< Receive time-out interrupt mask shift */
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#define SSI_IM_RORIM 0x00000001 /**< Receive overrun interrupt mask */
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#define SSI_IM_RORIM_M 0x00000001 /**< Receive overrun interrupt mask mask */
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#define SSI_IM_RORIM_S 0 /**< Receive overrun interrupt mask shift */
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#define SSI_RIS_TXRIS 0x00000008 /**< SSITXINTR raw state */
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#define SSI_RIS_TXRIS_M 0x00000008 /**< SSITXINTR raw state mask */
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#define SSI_RIS_TXRIS_S 3 /**< SSITXINTR raw state shift */
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#define SSI_RIS_RXRIS 0x00000004 /**< SSIRXINTR raw state */
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#define SSI_RIS_RXRIS_M 0x00000004 /**< SSIRXINTR raw state mask */
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#define SSI_RIS_RXRIS_S 2 /**< SSIRXINTR raw state shift */
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#define SSI_RIS_RTRIS 0x00000002 /**< SSIRTINTR raw state */
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#define SSI_RIS_RTRIS_M 0x00000002 /**< SSIRTINTR raw state mask */
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#define SSI_RIS_RTRIS_S 1 /**< SSIRTINTR raw state shift */
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#define SSI_RIS_RORRIS 0x00000001 /**< SSIRORINTR raw state */
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#define SSI_RIS_RORRIS_M 0x00000001 /**< SSIRORINTR raw state mask */
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#define SSI_RIS_RORRIS_S 0 /**< SSIRORINTR raw state shift */
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#define SSI_MIS_TXMIS 0x00000008 /**< SSITXINTR masked state */
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#define SSI_MIS_TXMIS_M 0x00000008 /**< SSITXINTR masked state mask */
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#define SSI_MIS_TXMIS_S 3 /**< SSITXINTR masked state shift */
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#define SSI_MIS_RXMIS 0x00000004 /**< SSIRXINTR masked state */
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#define SSI_MIS_RXMIS_M 0x00000004 /**< SSIRXINTR masked state mask */
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#define SSI_MIS_RXMIS_S 2 /**< SSIRXINTR masked state shift */
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#define SSI_MIS_RTMIS 0x00000002 /**< SSIRTINTR masked state */
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#define SSI_MIS_RTMIS_M 0x00000002 /**< SSIRTINTR masked state mask */
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#define SSI_MIS_RTMIS_S 1 /**< SSIRTINTR masked state shift */
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#define SSI_MIS_RORMIS 0x00000001 /**< SSIRORINTR masked state */
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#define SSI_MIS_RORMIS_M 0x00000001 /**< SSIRORINTR masked state mask */
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#define SSI_MIS_RORMIS_S 0 /**< SSIRORINTR masked state shift */
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#define SSI_ICR_RTIC 0x00000002 /**< Receive time-out interrupt clear */
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#define SSI_ICR_RTIC_M 0x00000002 /**< Receive time-out interrupt clear mask */
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#define SSI_ICR_RTIC_S 1 /**< Receive time-out interrupt clear shift */
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#define SSI_ICR_RORIC 0x00000001 /**< Receive overrun interrupt clear */
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#define SSI_ICR_RORIC_M 0x00000001 /**< Receive overrun interrupt clear mask */
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#define SSI_ICR_RORIC_S 0 /**< Receive overrun interrupt clear shift */
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#define SSI_DMACTL_TXDMAE 0x00000002 /**< Transmit DMA enable */
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#define SSI_DMACTL_TXDMAE_M 0x00000002 /**< Transmit DMA enable mask */
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#define SSI_DMACTL_TXDMAE_S 1 /**< Transmit DMA enable shift */
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#define SSI_DMACTL_RXDMAE 0x00000001 /**< Receive DMA enable */
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#define SSI_DMACTL_RXDMAE_M 0x00000001 /**< Receive DMA enable mask */
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#define SSI_DMACTL_RXDMAE_S 0 /**< Receive DMA enable shift */
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#define SSI_CC_CS_M 0x00000007 /**< Baud and system clock source mask */
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#define SSI_CC_CS_S 0 /**< Baud and system clock source shift */
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/** @} */
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/*---------------------------------------------------------------------------*/
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/** \name SSI Register Values
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* @{
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*/
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#define SSI_CR0_SPH 0x00000080 /**< Serial clock phase (H) */
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#define SSI_CR0_SPO 0x00000040 /**< Serial clock phase (O) */
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#define SSI_CR0_FRF_MOTOROLA 0x00000000 /**< Motorola frame format */
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#define SSI_CR0_FRF_TI 0x00000010 /**< Texas Instruments frame format */
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#define SSI_CR0_FRF_MICROWIRE 0x00000020 /**< National Microwire frame format */
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#define SSI_CR1_SOD 0x00000008 /**< Slave mode output disable */
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#define SSI_CR1_MS 0x00000004 /**< Master and slave select */
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#define SSI_CR1_SSE 0x00000002 /**< Synchronous serial port enable */
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#define SSI_CR1_LBM 0x00000001 /**< Loop-back mode */
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#define SSI_SR_BSY 0x00000010 /**< Busy bit */
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#define SSI_SR_RFF 0x00000008 /**< Receive FIFO full */
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#define SSI_SR_RNE 0x00000004 /**< Receive FIFO not empty */
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#define SSI_SR_TNF 0x00000002 /**< Transmit FIFO not full */
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#define SSI_SR_TFE 0x00000001 /**< Transmit FIFO empty */
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#define SSI_IM_TXIM 0x00000008 /**< Transmit FIFO interrupt mask */
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#define SSI_IM_RXIM 0x00000004 /**< Receive FIFO interrupt mask */
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#define SSI_IM_RTIM 0x00000002 /**< Receive time-out interrupt mask */
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#define SSI_IM_RORIM 0x00000001 /**< Receive overrun interrupt mask */
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#define SSI_RIS_TXRIS 0x00000008 /**< SSITXINTR raw state */
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#define SSI_RIS_RXRIS 0x00000004 /**< SSIRXINTR raw state */
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#define SSI_RIS_RTRIS 0x00000002 /**< SSIRTINTR raw state */
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#define SSI_RIS_RORRIS 0x00000001 /**< SSIRORINTR raw state */
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#define SSI_MIS_TXMIS 0x00000008 /**< SSITXINTR masked state */
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#define SSI_MIS_RXMIS 0x00000004 /**< SSIRXINTR masked state */
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#define SSI_MIS_RTMIS 0x00000002 /**< SSIRTINTR masked state */
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#define SSI_MIS_RORMIS 0x00000001 /**< SSIRORINTR masked state */
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#define SSI_ICR_RTIC 0x00000002 /**< Receive time-out interrupt clear */
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#define SSI_ICR_RORIC 0x00000001 /**< Receive overrun interrupt clear */
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#define SSI_DMACTL_TXDMAE 0x00000002 /**< Transmit DMA enable */
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#define SSI_DMACTL_RXDMAE 0x00000001 /**< Receive DMA enable */
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/** @} */
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#endif
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/**
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@ -41,27 +41,51 @@
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#ifndef SPI_ARCH_H_
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#define SPI_ARCH_H_
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#include "contiki.h"
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#include "dev/ssi.h"
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#define SPI_WAITFORTxREADY() do { \
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while(!(REG(SSI0_BASE + SSI_SR) & SSI_SR_TNF)); \
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} while (0)
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} while(0)
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#define SPI_TXBUF REG(SSI0_BASE + SSI_DR)
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#define SPI_RXBUF REG(SSI0_BASE + SSI_DR)
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#define SPI_WAITFOREOTx() do { \
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while(REG(SSI0_BASE + SSI_SR) & SSI_SR_BSY); \
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} while (0)
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} while(0)
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#define SPI_WAITFOREORx() do { \
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while(!(REG(SSI0_BASE + SSI_SR) & SSI_SR_RNE)); \
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} while (0)
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} while(0)
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#ifdef SPI_FLUSH
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#error "You must include spi-arch.h before spi.h for the CC2538."
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#endif
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#define SPI_FLUSH() do { \
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SPI_WAITFOREORx(); \
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while (REG(SSI0_BASE + SSI_SR) & SSI_SR_RNE) { \
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SPI_RXBUF; \
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} \
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} while(0)
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#define SPI_CS_CLR(port, pin) do { \
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GPIO_CLR_PIN(GPIO_PORT_TO_BASE(port), GPIO_PIN_MASK(pin)); \
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} while(0)
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#define SPI_CS_SET(port, pin) do { \
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GPIO_SET_PIN(GPIO_PORT_TO_BASE(port), GPIO_PIN_MASK(pin)); \
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} while(0)
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/*---------------------------------------------------------------------------*/
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/** \name Arch-specific SPI functions
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* @{
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*/
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/**
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* \brief Configure a GPIO to be the chip select pin
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*/
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void spi_cs_init(uint8_t port, uint8_t pin);
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/** \brief Enables the SPI peripheral
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*/
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void spi_enable(void);
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@ -71,6 +95,27 @@ void spi_enable(void);
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*/
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void spi_disable(void);
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/**
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* \brief Configure the SPI data and clock polarity and the data size.
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*
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* This function configures the SSI peripheral to use a particular SPI
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* configuration that a slave device requires. It should always be called
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* before using the SPI bus as another driver could have changed the settings.
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*
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* See section 19.4.4 in the CC2538 user guide for more information.
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*
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* \param frame_format Set the SSI frame format. Use SSI_CR0_FRF_MOTOROLA,
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* SSI_CR0_FRF_TI, or SSI_CR0_FRF_MICROWIRE.
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* \param clock_polarity In Motorola mode, set whether the clock is high or low
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* when idle. Use SSI_CR0_SPO or 0.
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* \param clock_phase In Motorola mode, select whether data is valid on the
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* first or second edge of the clock. Use SSI_CR0_SPH or 0.
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* \param data_size The number of bits in each "byte" of data. Must be
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* between 4 and 16, inclusive.
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*/
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void spi_set_mode(uint32_t frame_format, uint32_t clock_polarity,
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uint32_t clock_phase, uint32_t data_size);
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/** @} */
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#endif /* SPI_ARCH_H_ */
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@ -193,8 +193,6 @@
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#define SPI_MOSI_PIN 4
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#define SPI_MISO_PORT GPIO_A_NUM
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#define SPI_MISO_PIN 5
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#define SPI_SEL_PORT GPIO_B_NUM
|
||||
#define SPI_SEL_PIN 5
|
||||
/** @} */
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/**
|
||||
|
|
|
|||
Loading…
Reference in New Issue