void uart_poweron(uart_t uart)
{
switch (uart) {
#if UART_0_EN
case UART_0:
UART_0_CLKEN();
break;
#endif
#if UART_1_EN
case UART_1:
UART_1_CLKEN();
break;
#endif
#if UART_2_EN
case UART_2:
UART_2_CLKEN();
break;
#endif
}
}
static int init_base(uart_t uart, uint32_t baudrate)
{
USART_TypeDef *dev = 0;
GPIO_TypeDef *port = 0;
uint32_t tx_pin = 0;
uint32_t rx_pin = 0;
uint8_t af = 0;
uint32_t clk = 0;
uint16_t mantissa;
uint8_t fraction;
switch (uart) {
#if UART_0_EN
case UART_0:
dev = UART_0_DEV;
port = UART_0_PORT;
clk = UART_0_CLK;
tx_pin = UART_0_TX_PIN;
rx_pin = UART_0_RX_PIN;
af = UART_0_AF;
UART_0_CLKEN();
UART_0_PORT_CLKEN();
break;
#endif
#if UART_1_EN
case UART_1:
dev = UART_1_DEV;
port = UART_1_PORT;
clk = UART_1_CLK;
tx_pin = UART_1_TX_PIN;
rx_pin = UART_1_RX_PIN;
af = UART_1_AF;
UART_1_CLKEN();
UART_1_PORT_CLKEN();
break;
#endif
#if UART_2_EN
case UART_2:
dev = UART_2_DEV;
port = UART_2_PORT;
clk = UART_2_CLK;
tx_pin = UART_2_TX_PIN;
rx_pin = UART_2_RX_PIN;
af = UART_2_AF;
UART_2_CLKEN();
UART_2_PORT_CLKEN();
break;
#endif
default:
return -1;
}
/* uart_configure RX and TX pins, set pin to use alternative function mode */
port->MODER &= ~(3 << (rx_pin * 2) | 3 << (tx_pin * 2));
port->MODER |= 2 << (rx_pin * 2) | 2 << (tx_pin * 2);
/* and assign alternative function */
if (rx_pin < 8) {
port->AFR[0] &= ~(0xf << (rx_pin * 4));
port->AFR[0] |= af << (rx_pin * 4);
}
else {
port->AFR[1] &= ~(0xf << ((rx_pin - 8) * 4));
port->AFR[1] |= af << ((rx_pin - 8) * 4);
}
if (tx_pin < 8) {
port->AFR[0] &= ~(0xf << (tx_pin * 4));
port->AFR[0] |= af << (tx_pin * 4);
}
else {
port->AFR[1] &= ~(0xf << ((tx_pin - 8) * 4));
port->AFR[1] |= af << ((tx_pin - 8) * 4);
}
/* uart_configure UART to mode 8N1 with given baudrate */
clk /= baudrate;
mantissa = (uint16_t)(clk / 16);
fraction = (uint8_t)(clk - (mantissa * 16));
dev->BRR = ((mantissa & 0x0fff) << 4) | (0x0f & fraction);
/* enable receive and transmit mode */
dev->CR3 = 0;
dev->CR2 = 0;
dev->CR1 |= USART_CR1_UE | USART_CR1_TE | USART_CR1_RE;
return 0;
}
static int init_base(uart_t uart, uint32_t baudrate)
{
USART_TypeDef *dev = 0;
gpio_t tx_pin = 0;
gpio_t rx_pin = 0;
gpio_af_t af = 0;
float clk = 0;
uint16_t mantissa;
uint8_t fraction;
switch (uart) {
#if UART_0_EN
case UART_0:
dev = UART_0_DEV;
clk = UART_0_CLK;
tx_pin = UART_0_TX_PIN;
rx_pin = UART_0_RX_PIN;
af = UART_0_AF;
UART_0_CLKEN();
break;
#endif
#if UART_1_EN
case UART_1:
dev = UART_1_DEV;
clk = UART_1_CLK;
tx_pin = UART_1_TX_PIN;
rx_pin = UART_1_RX_PIN;
af = UART_1_AF;
UART_1_CLKEN();
break;
#endif
#if UART_2_EN
case UART_2:
dev = UART_2_DEV;
clk = UART_2_CLK;
tx_pin = UART_2_TX_PIN;
rx_pin = UART_2_RX_PIN;
af = UART_2_AF;
UART_2_CLKEN();
break;
#endif
default:
return -1;
}
/* uart_configure RX and TX pins, set pin to use alternative function mode */
gpio_init(tx_pin, GPIO_DIR_OUT, GPIO_NOPULL);
gpio_init_af(tx_pin, af);
gpio_init(rx_pin, GPIO_DIR_IN, GPIO_NOPULL);
gpio_init_af(rx_pin, af);
/* uart_configure UART to mode 8N1 with given baudrate */
clk /= baudrate;
mantissa = (uint16_t)(clk / 16);
fraction = (uint8_t)(clk - (mantissa * 16));
dev->BRR = ((mantissa & 0x0fff) << 4) | (0x0f & fraction);
/* enable receive and transmit mode */
dev->CR3 = 0;
dev->CR2 = 0;
dev->CR1 |= USART_CR1_UE | USART_CR1_TE | USART_CR1_RE;
return 0;
}
