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stm32f4: Allow the USART serial port to be configured 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-07-28 22:27:32 -04:00
parent e6ffef9a9f
commit c176b66f29
2 changed files with 54 additions and 15 deletions
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17
src/stm32f4/Kconfig
View File

@ -64,5 +64,22 @@ config CLOCK_REF_8M
config SERIAL config SERIAL
bool bool
default y default y
choice
depends on SERIAL
prompt "Serial Port" if LOW_LEVEL_OPTIONS
help
Select the serial device to use.
config STM32_SERIAL_USART1
bool "USART1"
config STM32_SERIAL_USART2
bool "USART2"
config STM32_SERIAL_USART3
bool "USART3"
endchoice
config SERIAL_PORT
int
default 3 if STM32_SERIAL_USART3
default 2 if STM32_SERIAL_USART2
default 1
endif endif

52
src/stm32f4/serial.c
View File

@ -10,7 +10,29 @@
#include "internal.h" // enable_pclock #include "internal.h" // enable_pclock
#include "sched.h" // DECL_INIT #include "sched.h" // DECL_INIT
// Select the configured serial port
#if CONFIG_SERIAL_PORT == 1
DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA10,PA9");
#define GPIO_Rx GPIO('A', 10)
#define GPIO_Tx GPIO('A', 9)
#define USARTx USART1
#define USARTx_IRQn USART1_IRQn
#define USARTx_IRQHandler USART1_IRQHandler
#elif CONFIG_SERIAL_PORT == 2
DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA3,PA2"); DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA3,PA2");
#define GPIO_Rx GPIO('A', 3)
#define GPIO_Tx GPIO('A', 2)
#define USARTx USART2
#define USARTx_IRQn USART2_IRQn
#define USARTx_IRQHandler USART2_IRQHandler
#else
DECL_CONSTANT_STR("RESERVE_PINS_serial", "PB11,PB10");
#define GPIO_Rx GPIO('B', 11)
#define GPIO_Tx GPIO('B', 10)
#define USARTx USART3
#define USARTx_IRQn USART3_IRQn
#define USARTx_IRQHandler USART3_IRQHandler
#endif
#define CR1_FLAGS (USART_CR1_UE | USART_CR1_RE | USART_CR1_TE \ #define CR1_FLAGS (USART_CR1_UE | USART_CR1_RE | USART_CR1_TE \
| USART_CR1_RXNEIE) | USART_CR1_RXNEIE)
@ -18,39 +40,39 @@ DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA3,PA2");
void void
serial_init(void) serial_init(void)
{ {
enable_pclock(USART2_BASE); enable_pclock((uint32_t)USARTx);
uint32_t pclk = get_pclock_frequency(USART2_BASE); uint32_t pclk = get_pclock_frequency((uint32_t)USARTx);
uint32_t div = DIV_ROUND_CLOSEST(pclk, CONFIG_SERIAL_BAUD); uint32_t div = DIV_ROUND_CLOSEST(pclk, CONFIG_SERIAL_BAUD);
USART2->BRR = (((div / 16) << USART_BRR_DIV_Mantissa_Pos) USARTx->BRR = (((div / 16) << USART_BRR_DIV_Mantissa_Pos)
| ((div % 16) << USART_BRR_DIV_Fraction_Pos)); | ((div % 16) << USART_BRR_DIV_Fraction_Pos));
USART2->CR1 = CR1_FLAGS; USARTx->CR1 = CR1_FLAGS;
NVIC_SetPriority(USART2_IRQn, 0); NVIC_SetPriority(USARTx_IRQn, 0);
NVIC_EnableIRQ(USART2_IRQn); NVIC_EnableIRQ(USARTx_IRQn);
gpio_peripheral(GPIO('A', 2), GPIO_FUNCTION(7), 0); gpio_peripheral(GPIO_Rx, GPIO_FUNCTION(7), 1);
gpio_peripheral(GPIO('A', 3), GPIO_FUNCTION(7), 1); gpio_peripheral(GPIO_Tx, GPIO_FUNCTION(7), 0);
} }
DECL_INIT(serial_init); DECL_INIT(serial_init);
void __visible void __visible
USART2_IRQHandler(void) USARTx_IRQHandler(void)
{ {
uint32_t sr = USART2->SR; uint32_t sr = USARTx->SR;
if (sr & (USART_SR_RXNE | USART_SR_ORE)) if (sr & (USART_SR_RXNE | USART_SR_ORE))
serial_rx_byte(USART2->DR); serial_rx_byte(USARTx->DR);
if (sr & USART_SR_TXE && USART2->CR1 & USART_CR1_TXEIE) { if (sr & USART_SR_TXE && USARTx->CR1 & USART_CR1_TXEIE) {
uint8_t data; uint8_t data;
int ret = serial_get_tx_byte(&data); int ret = serial_get_tx_byte(&data);
if (ret) if (ret)
USART2->CR1 = CR1_FLAGS; USARTx->CR1 = CR1_FLAGS;
else else
USART2->DR = data; USARTx->DR = data;
} }
} }
void void
serial_enable_tx_irq(void) serial_enable_tx_irq(void)
{ {
USART2->CR1 = CR1_FLAGS | USART_CR1_TXEIE; USARTx->CR1 = CR1_FLAGS | USART_CR1_TXEIE;
} }