請問各位高手,目前使用SPI1控制93C46(128X8)但是控制命令+address共10BIT我該如何送命令呢?stm32f051r8 pa5:sck, pa6:miso, pa7:mosi, pa4:cs start bit=1 op code=10 A6 A5 A4 A3 A2 A1 A0 --> (read) read: 1100000000 先送出(0xC0)再送(0x00)對嗎?還是先送(0X03)再送(0X00)? SPI_DataSize_10b對嗎?還是要設成SPI_DataSize_8b? 麻煩各位高手指點一下小弟.... void SPI_INIT(void) { SPI_InitTypeDef SPI_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE); SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; SPI_InitStructure.SPI_Mode = SPI_Mode_Master; SPI_InitStructure.SPI_DataSize = SPI_DataSize_10b; 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_128; SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStructure.SPI_CRCPolynomial = 7; SPI_Init(SPI1, &SPI_InitStructure); SPI_RxFIFOThresholdConfig(SPI1, SPI_RxFIFOThreshold_QF); SPI_SSOutputCmd(SPI1, ENABLE); SPI_Cmd(SPI1,ENABLE); } |
好的我試看看.....
我先送0x03那前面都是0 (00000011),這樣93c46的start bit 1可以被判斷出來嗎?我試過先送0x03,0x00還是不行耶....
你是說直接送(0xC000)還是(0x0300)?可是命令+address共10bit那多出來的如何處理呢?
datasheet上說明read : 1 10 a6 a5 a4 a3 a2 a1 a0--->?該如何送?
datasheet上說明read : 1 10 a6 a5 a4 a3 a2 a1 a0数据手册上怎么没查到
void SPI2_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//配置SPI2管脚
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 |GPIO_Pin_14| GPIO_Pin_15;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOB, &GPIO_InitStructure);
//SPI2配置选项
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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStructure);
//使能SPI2
SPI_Cmd(SPI2, ENABLE);
}