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SPI to LCD FT800 not working well

rifqi
Associate
Posted on October 26, 2015 at 04:42

First i use Mode for SCK and MOSI was AF_PP but we read a strange value 0x42. and i Change it to AF_OD and it shows another value, that was 0xFE. and still not find the ready value of FT800 display. that should show 0x7c. I use STM32F103ZG. 

Here is my Code:

void SpiConfig(void)

{

    GPIO_InitTypeDef GPIO_InitStructure;

    SPI_InitTypeDef SPI_InitStructure;

    

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Pin = SPI1_SCK | SPI1_MOSI;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    

    GPIO_InitStructure.GPIO_Pin = SPI1_MISO;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    

    GPIO_InitStructure.GPIO_Pin = SPI1_PD | SPI1_CS;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

    GPIO_Init(GPIOB, &GPIO_InitStructure);

    

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

//     RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

    

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;

    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;

    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;

    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

    SPI_InitStructure.SPI_CRCPolynomial = 7;

    SPI_Init(SPI1, &SPI_InitStructure);

    

    SPI_Cmd(SPI1, ENABLE);

}

Please Help me.. thanks

#spi
2 REPLIES 2
Posted on October 26, 2015 at 16:02

F1 coding tends to have MISO tagged as an Input, as I recall.

Double check your clock phase settings are correct.

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rifqi
Associate
Posted on November 19, 2015 at 04:35

Thanks Clive1 I got the answer. I just add this code, 

while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_BSY) == SET);

on the SPI Transmit function. May be on the slave didnt receive last bit data.

But Now I have a new problem on receive data on the master. We Always lost last bit data I have tried to add ''waiting busy flag'' before chip select gone high. I use Mode 0 SPI type. Could you suggest me how to troubleshoot this kind of problem? Where Should I start check? Thanks Very Much.