I am trying to implement simple spi communication between 2 stm8s. Sending 0x04( address of pin2) and passing the received data as argument to GPIO high function so that LED connected at PORT D PIN 2 will glow. Master code is working properly, degugging properly, but in slave the TXE is not becoming 1 and program is stuck there only. Does any one can help locating the problem if its in code?
Master code:
#include "stm8s.h"
#include "stm8s_gpio.h"
#include "stm8s_spi.h"
#include "stm8s_clk.h"
void GPIO_setup(void);
void clock_setup(void);
void GPIO_setup(void)
{ GPIO_DeInit(GPIOC);
GPIO_DeInit(GPIOB);
GPIO_DeInit(GPIOD);
GPIO_DeInit(GPIOA);
// led pin
GPIO_Init(GPIOA, GPIO_PIN_3,GPIO_MODE_OUT_PP_HIGH_FAST);//NSS
GPIO_Init(GPIOC,GPIO_PIN_5, GPIO_MODE_OUT_PP_HIGH_FAST );//sck pin 5
GPIO_Init(GPIOC, GPIO_PIN_6, GPIO_MODE_OUT_PP_HIGH_FAST);//mosi pin 6
GPIO_Init(GPIOC, GPIO_PIN_7, GPIO_MODE_IN_PU_NO_IT);//miso pin 7
}
void clock_setup(void)
{
CLK_DeInit();
CLK_HSECmd(DISABLE);
CLK_LSICmd(DISABLE);
CLK_HSICmd(ENABLE);
while(CLK_GetFlagStatus(CLK_FLAG_HSIRDY) == FALSE);
CLK_ClockSwitchCmd(ENABLE);
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);//00
CLK_SYSCLKConfig(CLK_PRESCALER_CPUDIV8);//0x80
CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO,CLK_SOURCE_HSI,DISABLE, CLK_CURRENTCLOCKSTATE_ENABLE);
CLK_PeripheralClockConfig(CLK_PCKENR1_SPI,ENABLE);
}
void main(void)
{
clock_setup();
GPIO_setup();
SPI_DeInit();
SPI_Init(SPI_FIRSTBIT_MSB, SPI_BAUDRATEPRESCALER_2, SPI_MODE_MASTER, SPI_CLOCKPOLARITY_HIGH,
SPI_CLOCKPHASE_1EDGE,SPI_DATADIRECTION_2LINES_FULLDUPLEX,SPI_NSS_SOFT,0x00);
SPI_NSSInternalSoftwareCmd(DISABLE);
SPI_Cmd(ENABLE);
GPIO_WriteLow(GPIOA,GPIO_PIN_3);// pull nss low
SPI_SendData(0x04);//pin 2 address
while(SPI_GetFlagStatus(SPI_FLAG_TXE)== RESET);
while(SPI_GetFlagStatus(SPI_FLAG_BSY));
GPIO_WriteHigh(GPIOA,GPIO_PIN_3);// pull NSS high
SPI_Cmd(DISABLE);// disable spi
}
SLAVE CODE:
#define STM8S103
#include "stm8s.h"
#include "stm8s_clk.h"
#include "stm8s_gpio.h"
#include "stm8s_spi.h"
uint8_t RxBuffer2=0;
void main(void)
{CLK_DeInit();
CLK_PeripheralClockConfig(CLK_PCKENR1_SPI,ENABLE);
GPIO_DeInit(GPIOD);
GPIO_DeInit(GPIOA);
GPIO_DeInit(GPIOC);
GPIO_DeInit(GPIOB);
GPIO_Init(GPIOC,GPIO_PIN_5,GPIO_MODE_IN_PU_NO_IT);//sck pin 5
GPIO_Init(GPIOC,GPIO_PIN_6,GPIO_MODE_IN_PU_NO_IT );//mosi pin 6
GPIO_Init(GPIOC,GPIO_PIN_7,GPIO_MODE_OUT_PP_HIGH_FAST);//miso
GPIO_Init(GPIOA,GPIO_PIN_3,GPIO_MODE_IN_PU_NO_IT);//nss
SPI_DeInit();
SPI_Init(SPI_FIRSTBIT_MSB, SPI_BAUDRATEPRESCALER_2, SPI_MODE_SLAVE, SPI_CLOCKPOLARITY_HIGH,
SPI_CLOCKPHASE_1EDGE,SPI_DATADIRECTION_2LINES_FULLDUPLEX,SPI_NSS_SOFT,0x00);
SPI_NSSInternalSoftwareCmd(DISABLE);
SPI_Cmd(ENABLE);
SPI_SendData(0x04);//pin 2
while(SPI_GetFlagStatus(SPI_FLAG_TXE)== RESET);
while (SPI_GetFlagStatus(SPI_FLAG_RXNE) == RESET)
{
}
RxBuffer2 = SPI_ReceiveData();
GPIO_Init(GPIOD,RxBuffer2,GPIO_MODE_OUT_PP_HIGH_SLOW);// turn on led at this address
GPIO_WriteHigh(GPIOD,RxBuffer2);
while(SPI_GetFlagStatus(SPI_FLAG_BSY));
}
Sir, I have checked that. It
Sir, I have checked that. It is not becoming 1, so stuck at
while(SPI_GetFlagStatus(SPI_FLAG_TXE)== RESET); loop only.
It seems like a issue on the
It seems like a issue on the hardware...
1. check connection first.
2. Check the SPI clock frequency and configuration.
3. Use a different IC to test the same code.
Sourav Gupta
PermalinkCould you make step debug on the reciver side? What ST tool are you using for programming?
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Joined February 12, 2018 696Monday at 02:11 PM