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stm32: Support PB7/PB6 for USART1 on stm32f0 

Add support for USART1 on PB7/PB6.

Remove STM32_SERIAL_USART1_ALT_PA15_PA14 option and allow all serial
mappings to be used on stm32f031.

Reported by @Desuuuu.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2021-08-01 13:23:45 -04:00
parent 69d9497df3
commit 0971a8c2e1
2 changed files with 17 additions and 10 deletions
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5
src/stm32/Kconfig
View File

@ -237,11 +237,8 @@ choice
config STM32_SERIAL_USART1
bool "Serial (on USART1 PA10/PA9)"
select SERIAL
config STM32_SERIAL_USART1_ALT_PA15_PA14
bool "Serial (on USART1 PA15/PA14)" if LOW_LEVEL_OPTIONS && MACH_STM32F0
select SERIAL
config STM32_SERIAL_USART1_ALT_PB7_PB6
bool "Serial (on USART1 PB7/PB6)" if LOW_LEVEL_OPTIONS && !MACH_STM32F0
bool "Serial (on USART1 PB7/PB6)" if LOW_LEVEL_OPTIONS
select SERIAL
config STM32_SERIAL_USART2
bool "Serial (on USART2 PA3/PA2)" if LOW_LEVEL_OPTIONS

22
src/stm32/stm32f0_serial.c
View File

@ -16,28 +16,38 @@
DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA10,PA9");
#define GPIO_Rx GPIO('A', 10)
#define GPIO_Tx GPIO('A', 9)
#define USARTx_FUNCTION GPIO_FUNCTION(1)
#define USARTx USART1
#define USARTx_IRQn USART1_IRQn
#elif CONFIG_STM32_SERIAL_USART1_ALT_PA15_PA14
DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA15,PA14");
#define GPIO_Rx GPIO('A', 15)
#define GPIO_Tx GPIO('A', 14)
#elif CONFIG_STM32_SERIAL_USART1_ALT_PB7_PB6
DECL_CONSTANT_STR("RESERVE_PINS_serial", "PB7,PB6");
#define GPIO_Rx GPIO('B', 7)
#define GPIO_Tx GPIO('B', 6)
#define USARTx_FUNCTION GPIO_FUNCTION(0)
#define USARTx USART1
#define USARTx_IRQn USART1_IRQn
#elif CONFIG_STM32_SERIAL_USART2
DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA3,PA2");
#define GPIO_Rx GPIO('A', 3)
#define GPIO_Tx GPIO('A', 2)
#define USARTx_FUNCTION GPIO_FUNCTION(1)
#define USARTx USART2
#define USARTx_IRQn USART2_IRQn
#elif CONFIG_STM32_SERIAL_USART2_ALT_PA15_PA14
DECL_CONSTANT_STR("RESERVE_PINS_serial", "PA15,PA14");
#define GPIO_Rx GPIO('A', 15)
#define GPIO_Tx GPIO('A', 14)
#define USARTx_FUNCTION GPIO_FUNCTION(1)
#define USARTx USART2
#define USARTx_IRQn USART2_IRQn
#endif
#if CONFIG_MACH_STM32F031
// The stm32f031 has same pins for USART2, but everything is routed to USART1
#define USART2 USART1
#define USART2_IRQn USART1_IRQn
#endif
#define CR1_FLAGS (USART_CR1_UE | USART_CR1_RE | USART_CR1_TE \
| USART_CR1_RXNEIE)
@ -75,7 +85,7 @@ serial_init(void)
USARTx->CR1 = CR1_FLAGS;
armcm_enable_irq(USARTx_IRQHandler, USARTx_IRQn, 0);
gpio_peripheral(GPIO_Rx, GPIO_FUNCTION(1), 1);
gpio_peripheral(GPIO_Tx, GPIO_FUNCTION(1), 0);
gpio_peripheral(GPIO_Rx, USARTx_FUNCTION, 1);
gpio_peripheral(GPIO_Tx, USARTx_FUNCTION, 0);
}
DECL_INIT(serial_init);