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serial config when parity is enabled 

When parity enabled the word length must be increased (CR1 bit 12 set).
Word length of 9 bit with parity is not supported.
This commit is contained in:
stevstrong 2015-11-19 21:11:45 +01:00
parent 7d2b43018f
commit b920cdc6a2
1 changed files with 13 additions and 14 deletions
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27
STM32F1/cores/maple/libmaple/usart_f1.c
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@ -108,13 +108,14 @@ void usart_config_gpios_async(usart_dev *udev,
gpio_set_mode(rx_dev, rx, GPIO_INPUT_FLOATING);
gpio_set_mode(tx_dev, tx, GPIO_AF_OUTPUT_PP);
/*
CR1 bit 12 Word length 0=8 1=9
CR1 bit 11 wake (default value is 0) we can safely set this value to 0 (zero) each time
CR1 bit 10 parity enable (1 = enabled)
CR1 bit 9 Parity selection 0 = Even 1 = Odd
CR2 bits 13 and 12 00 = 1 01 = 0.5 10 = 2 11 = 1.5
Not all USARTs support 1.5 or 0.5 bits so its best to avoid them.
When parity enabled the word length must be increased (CR1 bit 12 set).
Word length of 9 bit with parity is not supported.
CR2 CR1
0B00 0000
0B10 0000
@ -136,21 +137,19 @@ Not all USARTs support 1.5 or 0.5 bits so its best to avoid them.
#define SERIAL_9N1 0B 0000 1000
#define SERIAL_9N2 0B 0010 1000
#define SERIAL_8E1 0B 0000 0010
#define SERIAL_8E2 0B 0010 0010
#define SERIAL_9E1 0B 0000 1010
#define SERIAL_9E2 0B 0010 1010
#define SERIAL_8E1 0B 0000 1010
#define SERIAL_8E2 0B 0010 1010
//#define SERIAL_9E1 0B 0000 1010
//#define SERIAL_9E2 0B 0010 1010
#define SERIAL_8O1 0B 0000 0011
#define SERIAL_8O2 0B 0010 0011
#define SERIAL_9O1 0B 0000 1011
#define SERIAL_9O2 0B 0010 1011
#define SERIAL_8O1 0B 0000 1011
#define SERIAL_8O2 0B 0010 1011
//#define SERIAL_9O1 0B 0000 1011
//#define SERIAL_9O2 0B 0010 1011
*/
*/
udev->regs->CR1 = udev->regs->CR1 ^ ((udev->regs->CR1 ^ (flags&0x0F)<<9 ) & 0B0001111000000000);
udev->regs->CR2 = udev->regs->CR2 ^ ((udev->regs->CR2 ^ (flags&0xF0)<<8 ) & 0B0011000000000000);
udev->regs->CR1 = (udev->regs->CR1 & 0B1110000111111111) | ((uint32_t)(flags&0x0F)<<9);
udev->regs->CR2 = (udev->regs->CR2 & 0B1100111111111111) | ((uint32_t)(flags&0x30)<<8);
}
void usart_set_baud_rate(usart_dev *dev, uint32 clock_speed, uint32 baud) {