Posted on September 05, 2012 at 21:45 Hello, ai am trying to comunicate with external DAC and having some hard time using SPI3 in GPIOC port (12,10 and 11 for CS)
i have no problem with SPI2, but SPI2 is for LCD touschreen so i want to make new one;
so far i found mistake in standartlib:
* ===================================================================
* How to use this driver
* ===================================================================
*
* 1. Enable peripheral clock using the following functions
* RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE) for SPI1
* RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE) for SPI2
* RCC_APB1Periph
ResetCmd(RCC_APB1Periph_SPI3, ENABLE) for SPI3.
so far code looks like this, CS is working but no CLK or MOSI (i need just Tx)
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC , ENABLE);
/*!< SPI pins configuration *************************************************/
/*!< Connect SPI pins to AF5 */
GPIO_PinAFConfig(GPIOC, GPIO_Pin_12, GPIO_AF_SPI3 );
GPIO_PinAFConfig(GPIOC, GPIO_Pin_10, GPIO_AF_SPI3);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
/*!< SPI SCK pin configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/*!< SPI MOSI pin configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOC, &GPIO_InitStructure);
SPI_InitTypeDef SPI_InitStructure;
GPIO_SetBits(GPIOC, GPIO_Pin_11);
/*!< SPI configuration */
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
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_128;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI3, &SPI_InitStructure);
SPI_Cmd(SPI3, ENABLE);
for transmit 16b integer i use:
GPIO_ResetBits(GPIOC, GPIO_Pin_11);
while (SPI_I2S_GetFlagStatus(SPI3, SPI_FLAG_TXE) == RESET)
{}
SPI_I2S_SendData(SPI3, output);
GPIO_SetBits(GPIOC, GPIO_Pin_11); any ideas why i have no CLK or MOSI output
i am using STM32F417VGT6 144 pin
