456 lines
15 KiB
C
456 lines
15 KiB
C
/*****************************************************************************
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*
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* spi.c - CC3000 Host Driver Implementation.
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* Neither the name of Texas Instruments Incorporated nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*****************************************************************************/
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#include <string.h>
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#include "py/runtime.h"
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#include "pin.h"
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#include "led.h"
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#include "extint.h"
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#include "spi.h"
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#include "ccspi.h"
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#include "evnt_handler.h"
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#if 0 // print debugging info
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#include <stdio.h>
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#define DEBUG_printf(args...) printf(args)
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#else // don't print debugging info
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#define DEBUG_printf(args...) (void)0
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#endif
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// these need to be set to valid values before anything in this file will work
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STATIC const spi_t *SPI_HANDLE = NULL;
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STATIC const pin_obj_t *PIN_CS = NULL;
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STATIC const pin_obj_t *PIN_EN = NULL;
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STATIC const pin_obj_t *PIN_IRQ = NULL;
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#define CS_LOW() HAL_GPIO_WritePin(PIN_CS->gpio, PIN_CS->pin_mask, GPIO_PIN_RESET)
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#define CS_HIGH() HAL_GPIO_WritePin(PIN_CS->gpio, PIN_CS->pin_mask, GPIO_PIN_SET)
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#define READ 3
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#define WRITE 1
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#define HI(value) (((value) & 0xFF00) >> 8)
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#define LO(value) ((value) & 0x00FF)
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#define SPI_TIMEOUT (1000)
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#define HEADERS_SIZE_EVNT (SPI_HEADER_SIZE + 5)
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/* SPI bus states */
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#define eSPI_STATE_POWERUP (0)
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#define eSPI_STATE_INITIALIZED (1)
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#define eSPI_STATE_IDLE (2)
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#define eSPI_STATE_WRITE_IRQ (3)
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#define eSPI_STATE_WRITE_FIRST_PORTION (4)
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#define eSPI_STATE_WRITE_EOT (5)
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#define eSPI_STATE_READ_IRQ (6)
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#define eSPI_STATE_READ_FIRST_PORTION (7)
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#define eSPI_STATE_READ_EOT (8)
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// The magic number that resides at the end of the TX/RX buffer (1 byte after the allocated size)
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// for the purpose of detection of the overrun. The location of the memory where the magic number
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// resides shall never be written. In case it is written - the overrun occured and either recevie function
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// or send function will stuck forever.
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#define CC3000_BUFFER_MAGIC_NUMBER (0xDE)
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typedef struct {
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gcSpiHandleRx SPIRxHandler;
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unsigned short usTxPacketLength;
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unsigned short usRxPacketLength;
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unsigned long ulSpiState;
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unsigned char *pTxPacket;
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unsigned char *pRxPacket;
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} tSpiInformation;
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STATIC tSpiInformation sSpiInformation;
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STATIC char spi_buffer[CC3000_RX_BUFFER_SIZE];
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unsigned char wlan_tx_buffer[CC3000_TX_BUFFER_SIZE];
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STATIC const mp_obj_fun_builtin_fixed_t irq_callback_obj;
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// set the pins to use to communicate with the CC3000
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// the arguments must be of type pin_obj_t* and SPI_HandleTypeDef*
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void SpiInit(void *spi, const void *pin_cs, const void *pin_en, const void *pin_irq) {
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SPI_HANDLE = spi;
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PIN_CS = pin_cs;
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PIN_EN = pin_en;
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PIN_IRQ = pin_irq;
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}
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void SpiClose(void)
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{
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if (sSpiInformation.pRxPacket) {
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sSpiInformation.pRxPacket = 0;
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}
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tSLInformation.WlanInterruptDisable();
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//HAL_SPI_DeInit(SPI_HANDLE);
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}
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void SpiOpen(gcSpiHandleRx pfRxHandler)
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{
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DEBUG_printf("SpiOpen\n");
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/* initialize SPI state */
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sSpiInformation.ulSpiState = eSPI_STATE_POWERUP;
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sSpiInformation.SPIRxHandler = pfRxHandler;
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sSpiInformation.usTxPacketLength = 0;
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sSpiInformation.pTxPacket = NULL;
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sSpiInformation.pRxPacket = (unsigned char *)spi_buffer;
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sSpiInformation.usRxPacketLength = 0;
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spi_buffer[CC3000_RX_BUFFER_SIZE - 1] = CC3000_BUFFER_MAGIC_NUMBER;
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wlan_tx_buffer[CC3000_TX_BUFFER_SIZE - 1] = CC3000_BUFFER_MAGIC_NUMBER;
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/* SPI configuration */
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SPI_InitTypeDef *init = &SPI_HANDLE->spi->Init;
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init->Mode = SPI_MODE_MASTER;
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init->Direction = SPI_DIRECTION_2LINES;
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init->DataSize = SPI_DATASIZE_8BIT;
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init->CLKPolarity = SPI_POLARITY_LOW;
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init->CLKPhase = SPI_PHASE_2EDGE;
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init->NSS = SPI_NSS_SOFT;
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init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8;
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init->FirstBit = SPI_FIRSTBIT_MSB;
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init->TIMode = SPI_TIMODE_DISABLED;
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init->CRCCalculation = SPI_CRCCALCULATION_DISABLED;
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init->CRCPolynomial = 7;
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spi_init(SPI_HANDLE, false);
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// configure wlan CS and EN pins
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.Speed = GPIO_SPEED_FAST;
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GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_InitStructure.Pull = GPIO_NOPULL;
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GPIO_InitStructure.Alternate = 0;
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GPIO_InitStructure.Pin = PIN_CS->pin_mask;
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HAL_GPIO_Init(PIN_CS->gpio, &GPIO_InitStructure);
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GPIO_InitStructure.Pin = PIN_EN->pin_mask;
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HAL_GPIO_Init(PIN_EN->gpio, &GPIO_InitStructure);
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HAL_GPIO_WritePin(PIN_CS->gpio, PIN_CS->pin_mask, GPIO_PIN_SET);
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HAL_GPIO_WritePin(PIN_EN->gpio, PIN_EN->pin_mask, GPIO_PIN_RESET);
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/* do a dummy read, this ensures SCLK is low before
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actual communications start, it might be required */
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CS_LOW();
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uint8_t buf[1];
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HAL_SPI_Receive(SPI_HANDLE->spi, buf, sizeof(buf), SPI_TIMEOUT);
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CS_HIGH();
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// register EXTI
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extint_register((mp_obj_t)PIN_IRQ, GPIO_MODE_IT_FALLING, GPIO_PULLUP, (mp_obj_t)&irq_callback_obj, true);
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extint_enable(PIN_IRQ->pin);
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DEBUG_printf("SpiOpen finished; IRQ.pin=%d IRQ_LINE=%d\n", PIN_IRQ->pin, PIN_IRQ->pin);
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}
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long ReadWlanInterruptPin(void)
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{
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return HAL_GPIO_ReadPin(PIN_IRQ->gpio, PIN_IRQ->pin_mask);
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}
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void WriteWlanPin(unsigned char val)
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{
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HAL_GPIO_WritePin(PIN_EN->gpio, PIN_EN->pin_mask,
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(WLAN_ENABLE)? GPIO_PIN_SET:GPIO_PIN_RESET);
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}
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STATIC void SpiWriteDataSynchronous(unsigned char *data, unsigned short size)
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{
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DEBUG_printf("SpiWriteDataSynchronous(data=%p [%x %x %x %x], size=%u)\n", data, data[0], data[1], data[2], data[3], size);
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__disable_irq();
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if (HAL_SPI_TransmitReceive(SPI_HANDLE->spi, data, data, size, SPI_TIMEOUT) != HAL_OK) {
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//BREAK();
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}
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__enable_irq();
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DEBUG_printf(" - rx data = [%x %x %x %x]\n", data[0], data[1], data[2], data[3]);
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}
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STATIC void SpiReadDataSynchronous(unsigned char *data, unsigned short size)
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{
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memset(data, READ, size);
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__disable_irq();
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if (HAL_SPI_TransmitReceive(SPI_HANDLE->spi, data, data, size, SPI_TIMEOUT) != HAL_OK) {
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//BREAK();
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}
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__enable_irq();
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}
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STATIC void __delay_cycles(volatile int x)
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{
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x *= 6; // for 168 MHz CPU
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while (x--);
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}
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STATIC long SpiFirstWrite(unsigned char *ucBuf, unsigned short usLength)
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{
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DEBUG_printf("SpiFirstWrite %lu\n", sSpiInformation.ulSpiState);
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CS_LOW();
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// Assuming we are running on 24 MHz ~50 micro delay is 1200 cycles;
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__delay_cycles(1200);
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// SPI writes first 4 bytes of data
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SpiWriteDataSynchronous(ucBuf, 4);
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__delay_cycles(1200);
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SpiWriteDataSynchronous(ucBuf + 4, usLength - 4);
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// From this point on - operate in a regular way
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sSpiInformation.ulSpiState = eSPI_STATE_IDLE;
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CS_HIGH();
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return(0);
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}
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long SpiWrite(unsigned char *pUserBuffer, unsigned short usLength)
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{
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DEBUG_printf("SpiWrite %lu\n", sSpiInformation.ulSpiState);
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unsigned char ucPad = 0;
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// Figure out the total length of the packet in order to figure out if there
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// is padding or not
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if(!(usLength & 0x0001)) {
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ucPad++;
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}
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pUserBuffer[0] = WRITE;
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pUserBuffer[1] = HI(usLength + ucPad);
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pUserBuffer[2] = LO(usLength + ucPad);
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pUserBuffer[3] = 0;
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pUserBuffer[4] = 0;
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usLength += (SPI_HEADER_SIZE + ucPad);
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// The magic number that resides at the end of the TX/RX buffer (1 byte after the allocated size)
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// for the purpose of detection of the overrun. If the magic number is overriten - buffer overrun
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// occurred - and we will stuck here forever!
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if (wlan_tx_buffer[CC3000_TX_BUFFER_SIZE - 1] != CC3000_BUFFER_MAGIC_NUMBER) {
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while (1);
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}
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if (sSpiInformation.ulSpiState == eSPI_STATE_POWERUP) {
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while (sSpiInformation.ulSpiState != eSPI_STATE_INITIALIZED);
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}
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if (sSpiInformation.ulSpiState == eSPI_STATE_INITIALIZED) {
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// This is time for first TX/RX transactions over SPI:
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// the IRQ is down - so need to send read buffer size command
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SpiFirstWrite(pUserBuffer, usLength);
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} else {
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//
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// We need to prevent here race that can occur in case 2 back to back packets are sent to the
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// device, so the state will move to IDLE and once again to not IDLE due to IRQ
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//
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tSLInformation.WlanInterruptDisable();
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while (sSpiInformation.ulSpiState != eSPI_STATE_IDLE);
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sSpiInformation.ulSpiState = eSPI_STATE_WRITE_IRQ;
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sSpiInformation.pTxPacket = pUserBuffer;
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sSpiInformation.usTxPacketLength = usLength;
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// Assert the CS line and wait till SSI IRQ line is active and then initialize write operation
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CS_LOW();
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// Re-enable IRQ - if it was not disabled - this is not a problem...
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tSLInformation.WlanInterruptEnable();
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// check for a missing interrupt between the CS assertion and enabling back the interrupts
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if (tSLInformation.ReadWlanInterruptPin() == 0) {
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SpiWriteDataSynchronous(sSpiInformation.pTxPacket, sSpiInformation.usTxPacketLength);
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sSpiInformation.ulSpiState = eSPI_STATE_IDLE;
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CS_HIGH();
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}
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}
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// Due to the fact that we are currently implementing a blocking situation
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// here we will wait till end of transaction
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while (eSPI_STATE_IDLE != sSpiInformation.ulSpiState);
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return(0);
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}
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#if 0
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unused
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STATIC void SpiReadPacket(void)
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{
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int length;
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/* read SPI header */
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SpiReadDataSynchronous(sSpiInformation.pRxPacket, SPI_HEADER_SIZE);
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/* parse data length */
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STREAM_TO_UINT8(sSpiInformation.pRxPacket, SPI_HEADER_SIZE-1, length);
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/* read the remainder of the packet */
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SpiReadDataSynchronous(sSpiInformation.pRxPacket + SPI_HEADER_SIZE, length);
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sSpiInformation.ulSpiState = eSPI_STATE_READ_EOT;
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}
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#endif
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STATIC void SpiReadHeader(void)
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{
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SpiReadDataSynchronous(sSpiInformation.pRxPacket, 10);
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}
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STATIC void SpiTriggerRxProcessing(void)
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{
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SpiPauseSpi();
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CS_HIGH();
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// The magic number that resides at the end of the TX/RX buffer (1 byte after the allocated size)
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// for the purpose of detection of the overrun. If the magic number is overriten - buffer overrun
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// occurred - and we will stuck here forever!
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if (sSpiInformation.pRxPacket[CC3000_RX_BUFFER_SIZE - 1] != CC3000_BUFFER_MAGIC_NUMBER) {
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while (1);
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}
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sSpiInformation.ulSpiState = eSPI_STATE_IDLE;
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sSpiInformation.SPIRxHandler(sSpiInformation.pRxPacket + SPI_HEADER_SIZE);
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}
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STATIC long SpiReadDataCont(void)
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{
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long data_to_recv=0;
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unsigned char *evnt_buff, type;
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//determine what type of packet we have
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evnt_buff = sSpiInformation.pRxPacket;
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STREAM_TO_UINT8((char *)(evnt_buff + SPI_HEADER_SIZE), HCI_PACKET_TYPE_OFFSET, type);
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switch (type) {
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case HCI_TYPE_DATA:{
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// We need to read the rest of data..
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STREAM_TO_UINT16((char *)(evnt_buff + SPI_HEADER_SIZE),
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HCI_DATA_LENGTH_OFFSET, data_to_recv);
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if (!((HEADERS_SIZE_EVNT + data_to_recv) & 1)) {
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data_to_recv++;
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}
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if (data_to_recv) {
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SpiReadDataSynchronous(evnt_buff + 10, data_to_recv);
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}
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break;
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}
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case HCI_TYPE_EVNT: {
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// Calculate the rest length of the data
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STREAM_TO_UINT8((char *)(evnt_buff + SPI_HEADER_SIZE),
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HCI_EVENT_LENGTH_OFFSET, data_to_recv);
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data_to_recv -= 1;
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// Add padding byte if needed
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if ((HEADERS_SIZE_EVNT + data_to_recv) & 1) {
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data_to_recv++;
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}
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if (data_to_recv) {
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SpiReadDataSynchronous(evnt_buff + 10, data_to_recv);
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}
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sSpiInformation.ulSpiState = eSPI_STATE_READ_EOT;
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break;
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}
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}
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return 0;
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}
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STATIC void SSIContReadOperation(void)
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{
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// The header was read - continue with the payload read
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if (!SpiReadDataCont()) {
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/* All the data was read - finalize handling by switching
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to the task and calling from task Event Handler */
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SpiTriggerRxProcessing();
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}
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}
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STATIC mp_obj_t irq_callback(mp_obj_t line) {
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DEBUG_printf("<< IRQ; state=%lu >>\n", sSpiInformation.ulSpiState);
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switch (sSpiInformation.ulSpiState) {
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case eSPI_STATE_POWERUP:
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/* This means IRQ line was low call a callback of HCI Layer to inform on event */
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DEBUG_printf(" - POWERUP\n");
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sSpiInformation.ulSpiState = eSPI_STATE_INITIALIZED;
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break;
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case eSPI_STATE_IDLE:
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DEBUG_printf(" - IDLE\n");
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sSpiInformation.ulSpiState = eSPI_STATE_READ_IRQ;
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/* IRQ line goes down - we are start reception */
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CS_LOW();
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// Wait for TX/RX Compete which will come as DMA interrupt
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SpiReadHeader();
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sSpiInformation.ulSpiState = eSPI_STATE_READ_EOT;
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SSIContReadOperation();
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break;
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case eSPI_STATE_WRITE_IRQ:
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DEBUG_printf(" - WRITE IRQ\n");
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SpiWriteDataSynchronous(sSpiInformation.pTxPacket, sSpiInformation.usTxPacketLength);
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sSpiInformation.ulSpiState = eSPI_STATE_IDLE;
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CS_HIGH();
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break;
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(irq_callback_obj, irq_callback);
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void SpiPauseSpi(void) {
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DEBUG_printf("SpiPauseSpi\n");
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extint_disable(PIN_IRQ->pin);
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}
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void SpiResumeSpi(void) {
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DEBUG_printf("SpiResumeSpi\n");
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extint_enable(PIN_IRQ->pin);
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}
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