Hi Team,
Currently I am doing bare-metal programming in STM32F411 using Nucleo-F411RE board.
For USART6, I am trying to transmit string and bytes, in this string is working fine, but for single byte transmission it is not working?
void rcc_config(void)
{
RCC->CR |= 1 << 0; // HSI on
while(!(RCC->CR & (1 << 1))); // wait until HSI on
RCC->AHB1ENR |= (1 << 2) | (1 << 0); // Enable GPIO A & CFGR
RCC->APB1ENR |= (1 << 28); // Power Interface clock enable
RCC->APB2ENR |= (1 << 5) | (1 << 8); // Enable ADC and USART6
}
void uart_init(void)
{
USART6->CR1 &= ~(1 << 12); // 1:8N1
USART6->CR1 |= 1 << 9; // Parity Selection
USART6->CR1 |= 1 << 7; // TXE interrupt enable
USART6->CR1 |= 1 << 6; // TCIE enable
USART6->CR1 |= 1 << 5; // RXNE interrupt enable
USART6->CR1 |= 1 << 3; // TE enable
USART6->CR1 |= 1 << 2; // RE enable
USART6->CR2 |= 0x00 << 12; // 1 Stop bit
USART6->CR2 &= ~(1 << 11); // CLK disabled
USART6->CR3 &= ~(1 << 3); // FD is selected
USART6->CR3 &= ~(1 << 9); // CTS disable
USART6->CR3 &= ~(1 << 8); // RTS disable
USART6->CR3 |= (1 << 11); // One bit sample
USART6->BRR |= 0x08B; // 115200
USART6->CR1 |= 1 << 13; // Enable USART6 UE
}
void gpio_init(void)
{
RCC->AHB1ENR |= (1 << 2); // PC6/7 - Tx/Rx
GPIOC->MODER |= (2 << 12) | (2 << 14); // AF mode for PC6/7
GPIOC->OTYPER &= ~(1 << 6);
GPIOC->OTYPER &= ~(1 << 7);
GPIOA->MODER |= ((0x3 << (AN0 * 2)) | (0x3 << (AN1 * 2))); // set 0b11 for AN0 & AN1
GPIOC->OSPEEDR |= (1 << 12) | (1 << 14); // Medium speed
GPIOC->AFR[0] |= (8 << 24) | (8 << 28); // USART6 on AF8
}
void Uart_tx(int data)
{
while(!(USART6->SR & (1 << 7)))
{
}
USART6->DR = data & 0x1FF;
while(!(USART6->SR & USART_SR_TC));
}
void Uart_transmit_str(char *data)
{
uint8_t size = strlen(data);
while(size--)
{
Uart_tx(*data++);
}
while(!(USART6->SR & (1 << 6)));
}
int main(void)
{
rcc_config();
uart_init();
gpio_init();
Uart_transmit_str("ADC turned ON!!!\n\r");
while(1)
{
Uart_tx('B');
}
}
Let me the any correction needed in the code?
