Posted on July 13, 2018 at 01:05
Greetings,
I'm using Atollic True Studio compiler, cubemxcode with STM32L476RGx MCU. I'm trying to send and receive data to Memory FRAM MB85RS64V using SPI.Code below tries to send {0x06, 0x02, 0x00,0x04,0x01, 0x02, 0x03, 0x04, 0x04}, but the logic analyzer shows random garbage data everytime. (Screenshot Included)
int main(void)
{
/* USER CODE BEGIN 1 */
uint8_t writedata[] = {0x01, 0x02, 0x03, 0x04};
uint8_t readata[4];
GPIO_InitTypeDef gpioConfig;
/* USER CODE END 1 */
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_SPI2_Init();
/* USER CODE BEGIN 2 */
gpioConfig.Pin= 12;
gpioConfig.Mode = GPIO_MODE_AF_PP;
gpioConfig.Pull = GPIO_NOPULL;
gpioConfig.Speed = GPIO_SPEED_FREQ_MEDIUM ;
gpioConfig.Alternate = 0;
HAL_GPIO_Init(GPIOB, &gpioConfig);
//for(int i=0;i<4;i++)
HAL_SPI_TransmitReceive_IT(&hspi2, writedata, readata, sizeof(writedata)/sizeof(uint8_t));
//HAL_SPI_Receive_IT(&hspi2, readata, sizeof(readata)/sizeof(uint8_t));
//for(int i=0; i<50000; i++);
//HAL_SPI_Receive_IT(&hspi2, read data, 1);
//HAL_SPI_TransmitReceive(&hspi2, write data, read data, 1, HAL_MAX_DELAY);
// FRAM Implementation
uint8_t addr[]={0, 0x04};
uint8_t opcodewrite[] = {0x02};
uint8_t opcodewriteenable[]= {0x06};
uint8_t opcodewritereset[]= {0x04};
uint8_t opcoderead[] = {0x03};
HAL_GPIO_WritePin(GPIOB, 12, 0);
HAL_SPI_Transmit_IT(&hspi2, opcodewriteenable, sizeof(opcodewriteenable));
HAL_SPI_Transmit_IT(&hspi2, opcodewrite, sizeof(opcodewrite));
HAL_SPI_Transmit_IT(&hspi2, addr, 2);
HAL_SPI_Transmit_IT(&hspi2, writedata, 4);
HAL_SPI_Transmit_IT(&hspi2, opcodewritereset, sizeof(opcodewritereset));
HAL_GPIO_WritePin(GPIOB, 12, 1);
HAL_GPIO_WritePin(GPIOB, 12, 0);
HAL_SPI_Transmit_IT(&hspi2, opcoderead, sizeof(opcoderead));
HAL_SPI_Transmit_IT(&hspi2, addr, 2);
HAL_SPI_Receive_IT(&hspi2, readata, 4);
HAL_GPIO_WritePin(GPIOB, 12, 1);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
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Muthaiah Murugappan
#stm32l476 #stm-32 #fram #hal-spi #stm-mcu
Posted on July 16, 2018 at 15:02
Hey Andreas,
Thank you for your valuable time. Yes,I deliberatelyleft out the configuration steps. The second solution you provided of using the wait loop worked out to give MOSI the expected data.
If pseudo code might help:
#define ADD 0x04
uint8_t unused[4];
void Memory(void)
{
uint8_t writedata[] = { 0x01, 0x02, 0x03, 0x04};
uint8_t readdata[4];
GPIO_Config gpioConfig;
SPI_Config spiConfig;
// Configure Slave Select in GPIO
gpioConfig.pull = PULL_DOWN;
gpioConfig.mode = MODE_OUTPUT;
gpioConfig.op_type = OP_TYPE_PUSHPULL;
gpioConfig.speed = SPEED_MEDIUM;
InitializePort(NSS_PORT);
ConfigurePin(NSS_PORT, NSS_PIN, &gpioConfig, SPI_ALT_FUNCTION);
gpioConfig.mode = MODE_ALT;
gpioConfig.op_type = OP_TYPE_PUSHPULL;
gpioConfig.speed = SPEED_MEDIUM;
// Configure clock pin
gpioConfig.pull = ST_GPIO_PULL_DOWN;
InitializePort(CLK_PORT);
ConfigurePin(CLK_PORT, CLK_PIN, &gpioConfig, SPI_ALT_FUNCTION);
// Configure MISO pin
gpioConfig.pull = PULL_UP;
InitializePort(MISO_PORT);
ConfigurePin(MISO_PORT, MISO_PIN, &gpioConfig, SPI_ALT_FUNCTION);
// Configure MOSI pin
gpioConfig.pull = PULL_UP;
InitializePort(MOSI_PORT);
ConfigurePin(MOSI_PORT, MOSI_PIN, &gpioConfig, SPI_ALT_FUNCTION);
// Configure SPI
// Initialize the SPI peripheral.
spiConfig.baudRatePrescaler = PRESCALER_32;
spiConfig.biDirectional = true;
spiConfig.mode = MODE_1;
spiConfig.dataSize = DATASIZE_8;
spiConfig.lsbFirst = MSB_FIRST;
spiConfig.softwareSS = SW_SS;
spiConfig.master = true;
InitializeSPI(CHANNEL, &spiConfig);
WriteMemory( 1,writedata, sizeof(writedata) / sizeof(uint8_t));
//for(int i=0;i<500;++i);
ReadMemory( 1,readdata, sizeof(writedata) / sizeof(uint8_t));
}
void FramWrite(uint8_t addr, uint8_t *txbuffer, uint32_t size)
{
uint8_t opcode[] = {OPCODE_WRITE};
uint8_t opcode1[]= {OPCODE_WREN };
uint8_t opcode2[]= {OPCODE_WRDI };
uint8_t add[] = { 0, ADD};
WritePin(NSS_PORT, NSS_PIN, 0);
SPI_Transfer(1, opcode1, unused, sizeof(opcode));
while(IsBusy(CHANNEL));
WritePin(NSS_PORT, NSS_PIN, 1);
WritePin(NSS_PORT, NSS_PIN, 0);
SPI_Transfer(1, opcode, unused, sizeof(opcode));
while(IsBusy(CHANNEL));
WritePin(NSS_PORT, NSS_PIN, 1);
WritePin(NSS_PORT, NSS_PIN, 0);
SPI_Transfer(1, add, unused, sizeof(address));
while(IsBusy(CHANNEL));
WritePin(NSS_PORT, NSS_PIN, 1);
WritePin(NSS_PORT, NSS_PIN, 0);
Transfer(1, txbuffer, unused, size);
while(IsBusy(CHANNEL));
WritePin(NSS_PORT, NSS_PIN, 1);
WritePin(NSS_PORT, NSS_PIN, 0);
SPI_Transfer(1, opcode2, unused, sizeof(opcode));
while(IsBusy(CHANNEL));
WritePin(NSS_PORT, NSS_PIN, 1);
}
void FramRead(uint8_t addr, uint8_t *rxbuffer, uint32_t size)
{
uint8_t opcode[] = {OPCODE_READ};
uint8_t add[] = { 0, ADD};
WritePin(NSS_PORT, NSS_PIN, 0);
SPI_Transfer(1, opcode, unused, sizeof(opcode));
while(IsBusy(CHANNEL));
WritePin(NSS_PORT, NSS_PIN, 1);
WritePin(NSS_PORT, NSS_PIN, 0);
SPI_Transfer(1, add, unused, sizeof(address));
while(IsBusy(CHANNEL));
WritePin(NSS_PORT, NSS_PIN, 1);
WritePin(NSS_PORT, NSS_PIN, 0);
SPI_Transfer(1, unused, rxbuffer, size);
while(IsBusy(CHANNEL));
WritePin(NSS_PORT, NSS_PIN, 1);
}
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Thanks
Muthaiah
