No MOSI PULSE if use SPI re-mapped

[ronrafer]

Posted on February 28, 2013 at 04:03

A am using STM32F103T4, a low density device, and want to use the re-mapped SPI1. Below is my implementation:

  /* GPIO and AFIO clock enable */  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO| RCC_APB2Periph_GPIOB, ENABLE);             /* Enable SPI */        RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);       /*JTAG-DP Disabled and SW-DP Enabled */       GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE); //JTAG-DP Disabled and SW-DP Enabled                 /* Configure REmapped- SPI pins: SCK, MISO and MOSI */        GPIO_PinRemapConfig(GPIO_Remap_SPI1, ENABLE);                //Configure SPI pins:  SCLK=PB3, MOSI=PB5        GPIO_InitTypeDef GPIO_InitStructureB;        GPIO_InitStructureB.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_5;        GPIO_InitStructureB.GPIO_Mode = GPIO_Mode_AF_PP;        GPIO_InitStructureB.GPIO_Speed = GPIO_Speed_50MHz;        GPIO_Init(GPIOB, &GPIO_InitStructureB);                   //Configure SPI pins:  MISO=PB4        GPIO_InitStructureB.GPIO_Pin = GPIO_Pin_4;        GPIO_InitStructureB.GPIO_Mode = GPIO_Mode_IN_FLOATING;        GPIO_Init(GPIOB, &GPIO_InitStructureB);        GPIO_InitTypeDef GPIO_InitStructure;My problem is I have a clock pulse but no MOSI pulse. Do I have a missing code for MOSI on PB5 to work. kindly help. #spi-stm32f103 #spi-re-mapped

[Amel NASRI]

Posted on February 28, 2013 at 11:08 Hello, Try to add SPI1 alternate fucntion mapping before configuring GPIOs and le me know...

GPIO_PinRemapConfig(GPIO_Remap_SPI1, ENABLE);

Best Regards, ST.MCU

[PMICH.3]

The Mosi pin is conflicting with I2C1_SMBAl . Disable i2c and it will work !!