Posted on March 03, 2018 at 18:04
I beleive i have initialised my master STM32 correctly somehow i cant get my slave to understand my master.
My problem is my slave does not seem to understand the master, i have tried various things, like using SPI2 instead of SPI1, did not work, any help would be appreciated.
void init_spi_gpio(void)
{
GPIO_InitTypeDef SPI_GPIOStruct;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
/*
* PB3 - SCK
* PB4 - MISO
* PB5 - MOSI
* */
SPI_GPIOStruct.GPIO_Mode = GPIO_Mode_AF;
SPI_GPIOStruct.GPIO_OType = GPIO_OType_OD;
SPI_GPIOStruct.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
SPI_GPIOStruct.GPIO_PuPd = GPIO_PuPd_UP;
SPI_GPIOStruct.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOB, &SPI_GPIOStruct);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_SPI1);
/*NSS Pin Config */
GPIO_InitTypeDef SPI_SSPIN_Struct;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
SPI_SSPIN_Struct.GPIO_Mode = GPIO_Mode_OUT;
SPI_SSPIN_Struct.GPIO_OType = GPIO_OType_PP;
SPI_SSPIN_Struct.GPIO_Pin = GPIO_Pin_15;
SPI_SSPIN_Struct.GPIO_PuPd = GPIO_PuPd_UP;
SPI_SSPIN_Struct.GPIO_Speed = GPIO_High_Speed;
GPIO_Init(GPIOA, &SPI_SSPIN_Struct);
//GPIO_SetBits(GPIOA,GPIO_Pin_15);
}
void init_spi_module(void)
{
SPI_InitTypeDef SPI_InitStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
SPI_StructInit(&SPI_InitStruct);
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
//SPI_InitStruct.SPI_CRCPolynomial = 0x00;
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_LSB;
SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
SPI_InitStruct.SPI_NSS = SPI_NSS_Soft| SPI_NSSInternalSoft_Set;
SPI_Init(SPI1, &SPI_InitStruct);
SPI_Cmd(SPI1, ENABLE);
}
int main(void)
{
uint8_t RxChar;
SystemInit();
SysTick_Init();
RCC_HSICmd(ENABLE);
init_led_gpios();
init_spi_gpio();
init_spi_module();
init_usart2_comm_module();
init_usart2_gpio();
init_powerup();
USART_TX_string(''Reset!\n\r'');
GPIO_SetBits(GPIOD, GPIO_Pin_12);
while (1)
{
write_to_MAX7219(0x0A, 0x05);
Delay_ms(500);
MAX7219_displayNumber(25);
}
}
void write_to_MAX7219(uint8_t addr, uint8_t data)
{
uint16_t Addr, Data, Data_to_send;
Addr = (uint16_t)addr;
Data = (uint16_t)data;
Data_to_send = ( (Addr<<8 ) & 0xFF00 ) | Data ;
GPIO_ResetBits(GPIOA,GPIO_Pin_15);
SPI_send_word( Data_to_send );
GPIO_SetBits(GPIOA,GPIO_Pin_15);
}
void SPI_send_word(uint16_t byte)
{
while ( ( (SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_BSY) ) == SET))
;
SPI_I2S_SendData(SPI1, (uint16_t) byte);
while ( ( (SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE) ) != SET))
;
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1 ACCEPTED SOLUTION
Accepted Solutions
Posted on March 04, 2018 at 13:46
PA15 is configured as NSS yes. It was a really good idea with Logic ananlyzer. As it turned out, the SPI communication was not working as clean as i expected. I tried waiting after the busy flag was not set any more, but it did not really help. What i did was Set the SS pin to high on initiaslising in the Init routine, and im using SPI2 now, like this:
GPIO_Init(GPIOB, &SPI_SSPIN_Struct);
GPIO_SetBits(GPIOB,GPIO_Pin_12);�?�?I pull the line Low before sending a byte, then pull it high then again low. The send byte routine looks like this now,
void SPI_send_byte(uint8_t byte)
{
GPIO_ResetBits(GPIOB, GPIO_Pin_12);
SPI_I2S_SendData(SPI2,(uint16_t) byte);
while ( ( (SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_TXE) )!= SET))
;
while ( ( (SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_BSY) ) == SET))
;
GPIO_SetBits(GPIOB, GPIO_Pin_12);
GPIO_ResetBits(GPIOD, GPIO_Pin_12);
}�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?and i sent 3 dummy bytes over SPI from main routine, and i could see the bytes,
The problem is, somehow my 7 segment display expects 16 bit data on the bus, im not sure sending 2 consecutive 8 bit data would work, it does not till now. I tried sending 16bit data instead of two 8-bit, it still does not work as expected.
