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/**
*********************************************************************************************************
* Copyright(c) 2018, Realtek Semiconductor Corporation. All rights reserved.
**********************************************************************************************************
* @file main.c
* @brief This file provides demo code of three wire SPI communication.
* @details
* @author yuan
* @date 2019-01-15
* @version v0.1
*********************************************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include <stdlib.h>
#include "rtl876x_3wire_spi.h"
#include "rtl876x_pinmux.h"
#include "rtl876x_rcc.h"
#include "trace.h"
/* Defines -------------------------------------------------------------------*/
#define SPI_3WIRE_CLK_PIN P2_2
#define SPI_3WIRE_DATA_PIN P2_3
/**
* @brief Initialization of pinmux settings and pad settings.
* @param No parameter.
* @return Void
*/
void board_3wire_spi_init(void)
{
Pad_Config(SPI_3WIRE_CLK_PIN, PAD_PINMUX_MODE, PAD_IS_PWRON, PAD_PULL_NONE, PAD_OUT_ENABLE,
PAD_OUT_HIGH);
Pad_Config(SPI_3WIRE_DATA_PIN, PAD_PINMUX_MODE, PAD_IS_PWRON, PAD_PULL_NONE, PAD_OUT_ENABLE,
PAD_OUT_HIGH);
Pinmux_Config(SPI_3WIRE_CLK_PIN, SPI2W_CLK);
Pinmux_Config(SPI_3WIRE_DATA_PIN, SPI2W_DATA);
}
/**
* @brief Initialize 3wire-spi peripheral.
* @param No parameter.
* @return Void
*/
void driver_3wire_spi_init(void)
{
/* Enable SPI3WIRE clock */
RCC_PeriphClockCmd(APBPeriph_SPI2W, APBPeriph_SPI2W_CLOCK, ENABLE);
/* Initialize SPI3WIRE */
SPI3WIRE_InitTypeDef SPI3WIRE_InitStruct;
SPI3WIRE_StructInit(&SPI3WIRE_InitStruct);
SPI3WIRE_InitStruct.SPI3WIRE_SysClock = 20000000;
SPI3WIRE_InitStruct.SPI3WIRE_Speed = 800000;
SPI3WIRE_InitStruct.SPI3WIRE_Mode = SPI3WIRE_2WIRE_MODE;
/** The delay time from the end of address phase to the start of read data phase.
* delay time = (SPI3WIRE_ReadDelay +1)/(2*SPI3WIRE_Speed).
* delay time = (0x03 + 1)/(2 * speed) = 2.5us
*/
SPI3WIRE_InitStruct.SPI3WIRE_ReadDelay = 0x3;
SPI3WIRE_InitStruct.SPI3WIRE_OutputDelay = SPI3WIRE_OE_DELAY_NONE;
SPI3WIRE_InitStruct.SPI3WIRE_ExtMode = SPI3WIRE_NORMAL_MODE;
SPI3WIRE_Init(&SPI3WIRE_InitStruct);
}
/**
* @brief Read one byte through 3wire spi perpherial.
* @param address: address of register which need to read.
* @return Value of register.
*/
uint8_t spi3wire_readbyte(uint8_t address)
{
uint8_t reg_value = 0;
uint32_t timeout = 0;
/* Check spi busy or not */
while (SPI3WIRE_GetFlagStatus(SPI3WIRE_FLAG_BUSY) == SET)
{
timeout++;
if (timeout > 0x1ffff)
{
break;
}
}
/* Clear Receive data length */
SPI3WIRE_ClearRxDataLen();
SPI3WIRE_StartRead(address, 1);
timeout = 0;
while (SPI3WIRE_GetFlagStatus(SPI3WIRE_FLAG_BUSY) == SET)
{
timeout++;
if (timeout > 0x1ffff)
{
break;
}
}
/* Get the length of received data */
while (SPI3WIRE_GetRxDataLen() == 0);
/* Read data */
SPI3WIRE_ReadBuf(®_value, 1);
return reg_value;
}
/**
* @brief Write one byte.
* @param address: address of register which need to write data.
* @param data: data which need to write.
* @return TRUE: write success, FALSE: write failure.
*/
bool spi3wire_writebyte(uint8_t address, uint8_t data)
{
uint32_t timeout = 0;
/* Check 3wire spi busy or not */
while (SPI3WIRE_GetFlagStatus(SPI3WIRE_FLAG_BUSY) == SET)
{
timeout++;
if (timeout > 0x1ffff)
{
return false;
}
}
/* Write data */
SPI3WIRE_StartWrite(address, data);
timeout = 0;
while (SPI3WIRE_GetFlagStatus(SPI3WIRE_FLAG_BUSY) == SET)
{
timeout++;
if (timeout > 0x1ffff)
{
return false;
}
}
return true;
}
/**
* @brief Reset mouse.
* @param None.
* @return void.
*/
void mouse_reset(void)
{
uint32_t delay = 0;
spi3wire_writebyte(0x06, (1 << 7));
/* Delay 0.28ms */
for (delay = 0; delay < 0x1fff; delay++) {;}
}
/**
* @brief Read mouse product ID.
* @param p_id, --pointer to production id buffer,buffer length should more than two.
* @return TRUE.
*/
bool mouse_getproductid(uint8_t *p_id)
{
/* Read product ID number high byte */
*p_id++ = spi3wire_readbyte(0x20);
/* Read product ID number low byte */
*p_id = spi3wire_readbyte(0x21);
return true;
}
/**
* @brief Demo code of 3wire-spi communication.
* @param No parameter.
* @return void
*/
void spi3wire_demo(void)
{
uint8_t id[2] = {0, 0};
board_3wire_spi_init();
driver_3wire_spi_init();
/** Send resync time. Resync signal time = 2*1/(2*SPI3WIRE_Speed) = 1.25us
* This parameter can be only be the following value: 0x0 to 0xf.
*/
SPI3WIRE_SetResyncTime(2);
SPI3WIRE_ResyncSignalCmd(ENABLE);
while (SPI3WIRE_GetFlagStatus(SPI3WIRE_FLAG_RESYNC_BUSY) == SET);
SPI3WIRE_ResyncSignalCmd(DISABLE);
/* Enable SPI3WIRE to normal communication */
SPI3WIRE_Cmd(ENABLE);
mouse_reset();
mouse_getproductid(&id[0]);
if ((0x58 == id[0]) && (0x20 == (id[1] & 0xF0)))
{
/* Notes: DBG_DIRECT is only used in debug demo, do not use in app project.*/
DBG_DIRECT("SPI3WIRE test pass!");
}
else
{
/* Notes: DBG_DIRECT is only used in debug demo, do not use in app project.*/
DBG_DIRECT("SPI3WIRE test failed!");
}
}
/**
* @brief Entry of app code
* @return int (To avoid compile warning)
*/
int main(void)
{
extern uint32_t random_seed_value;
srand(random_seed_value);
spi3wire_demo();
while (1)
{
__nop();
__nop();
__nop();
__nop();
__nop();
__nop();
}
}
/******************* (C) COPYRIGHT 2018 Realtek Semiconductor Corporation *****END OF FILE****/
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