Hi everyone,
I would like to use a simple VGA (MCP6S21) but still not reach to do it.
The datasheet is available here : http://ww1.microchip.com/downloads/en/devicedoc/21117b.pdf
I'd like to put a +2 gain, the signals (SCK,MOSI) I transmit seems to be OK but the gain is still +1.
I also but on and off CS signal.
Here is my SPI init code ( generated with STM32CubeMX) :
void MX_SPI3_Init(void)
{
hspi3.Instance = SPI3;
hspi3.Init.Mode = SPI_MODE_MASTER;
hspi3.Init.Direction = SPI_DIRECTION_2LINES;
hspi3.Init.DataSize = SPI_DATASIZE_8BIT;
hspi3.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi3.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi3.Init.NSS = SPI_NSS_SOFT;
hspi3.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
hspi3.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi3.Init.TIMode = SPI_TIMODE_DISABLE;
hspi3.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi3.Init.CRCPolynomial = 7;
hspi3.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
hspi3.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
if (HAL_SPI_Init(&hspi3) != HAL_OK)
{
Error_Handler();
}
}
and my main code :
int main(void)
{
/* USER CODE BEGIN 1 */
/* 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_SPI3_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
uint8_t data[2];
data[0]=(uint8_t) WRITE; //0x40
data[1]=(uint8_t) GAIN_2; //0x01
HAL_GPIO_WritePin(GPIOC,GPIO_PIN_11,GPIO_PIN_SET);
HAL_Delay(100);
HAL_GPIO_WritePin(GPIOC,GPIO_PIN_11,GPIO_PIN_RESET);
while (HAL_SPI_Transmit(&hspi3,(uint8_t *)data,(uint16_t)sizeof(data),1000)!=HAL_OK);
HAL_GPIO_WritePin(GPIOC,GPIO_PIN_11,GPIO_PIN_SET);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
If someone could help me, I would really appreciate 🙂
