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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(rx_dev, rx, GPIO_INPUT_FLOATING);
gpio_set_mode(tx_dev, tx, GPIO_AF_OUTPUT_PP); gpio_set_mode(tx_dev, tx, GPIO_AF_OUTPUT_PP);
/* /*
CR1 bit 12 Word length 0=8 1=9 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 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 10 parity enable (1 = enabled)
CR1 bit 9 Parity selection 0 = Even 1 = Odd CR1 bit 9 Parity selection 0 = Even 1 = Odd
CR2 bits 13 and 12 00 = 1 01 = 0.5 10 = 2 11 = 1.5 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. 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 CR2 CR1
0B00 0000 0B00 0000
0B10 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_9N1 0B 0000 1000
#define SERIAL_9N2 0B 0010 1000 #define SERIAL_9N2 0B 0010 1000
#define SERIAL_8E1 0B 0000 0010 #define SERIAL_8E1 0B 0000 1010
#define SERIAL_8E2 0B 0010 0010 #define SERIAL_8E2 0B 0010 1010
#define SERIAL_9E1 0B 0000 1010 //#define SERIAL_9E1 0B 0000 1010
#define SERIAL_9E2 0B 0010 1010 //#define SERIAL_9E2 0B 0010 1010
#define SERIAL_8O1 0B 0000 0011 #define SERIAL_8O1 0B 0000 1011
#define SERIAL_8O2 0B 0010 0011 #define SERIAL_8O2 0B 0010 1011
#define SERIAL_9O1 0B 0000 1011 //#define SERIAL_9O1 0B 0000 1011
#define SERIAL_9O2 0B 0010 1011 //#define SERIAL_9O2 0B 0010 1011
*/
*/ udev->regs->CR1 = (udev->regs->CR1 & 0B1110000111111111) | ((uint32_t)(flags&0x0F)<<9);
udev->regs->CR2 = (udev->regs->CR2 & 0B1100111111111111) | ((uint32_t)(flags&0x30)<<8);
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);
} }
void usart_set_baud_rate(usart_dev *dev, uint32 clock_speed, uint32 baud) { void usart_set_baud_rate(usart_dev *dev, uint32 clock_speed, uint32 baud) {