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USART implementation of TX is done for the most common use cases | now working on RX

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interrupts
key 4 years ago
parent 64d174aec2
commit 2e4a027581
3 changed files with 110 additions and 40 deletions
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51
bsl/csl/interfaces/usart.h
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@ -28,29 +28,43 @@ extern "C" {
#include "pin.h"
#include "../stm32f042/Drivers/CMSIS/Device/ST/STM32F0xx/Include/stm32f042x6.h"
#define NO_PARITY_CTRL 0
#define PARITY_CTRL 1
/*! Enum of USART Word Lenght Options */
typedef enum
{
seven, /*!< 7 bits word Lenght */
eight, /*!< 8 bits word Lenght */
nine /*!< 9 bits word Lenght */
seven, /*!< **7 bits** word Lenght */
eight, /*!< **8 bits** word Lenght */
nine /*!< **9 bits** word Lenght */
}usartWordLength_t;
/*! Enum of USART Word Lenght Options */
typedef enum
{
usart1 = USART1_BASE , /*!< USART Channel 1 */
usart2 = USART2_BASE /*!< USART Channel 2 */
usart2 = USART2_BASE /*!< USART Channel 2 */
}usartNo_t;
/*! Enum of USART Parity Even or Odd */
typedef enum
{
even,
odd
even, /*!< **Even** Parity */
odd /*!< **Odd** Parity */
}usartParity_t;
/*! Enum of USART Hardware flow control options */
typedef enum
{
noFlowControl, /*!< **Disabeled** */
cts, /*!< **CTS** Only */
rts, /*!< **RTS** Only */
ctsRts /*!< **CTS & RTS** Enabled */
}usartHwFlowCtrl_t;
/**
* \brief Enable the USART with the most commment settings
* \param usartNo_t channel Uart **Channel** to be used
@ -64,7 +78,7 @@ void usartInit( usartNo_t channel,
uint32_t baud,
usartWordLength_t lenght,
uint8_t parity,
uint8_t hwFlowControl);
usartHwFlowCtrl_t flowCtrl);
/**
* \brief Enable the USART Transmission pin, be carefull this function will not link the right pin to the right UART channel.
@ -90,20 +104,35 @@ void usartSetWordLenght(usartNo_t channel, usartWordLength_t lenght);
/**
* \brief Sets the Baud Rate of the Usart channel.
* \param usartNo_t channel,
* \param uint32_t baud
* \retval none
*/
void usartSetBaudRate(usartNo_t channel, uint32_t baud);
/**
* \brief Sets the word lenght of the Usart channel.
* \param * USART_TypeDef usart
* \brief Stups Hardware Flow control
* \param usartNo_t channel,
* \param usartHwFlowCtrl_t flowCtrl
* \retval none
*/
void usartSendChar(int ch);
void usartSetHwFlowCtrl(usartNo_t channel, usartHwFlowCtrl_t flowCtrl);
/**
* \brief Sends a char array until \0 is detected.
* \param *ptr pointer to char array
* \retval none
*/
void print_Usart(char *ptr);
/**
* \brief Cheks id send buffer is empty an than Sends one Char
* \param uint8_t ch one Character.
* \retval none
*/
void usartSendChar(uint8_t ch);
#ifdef __cplusplus
}
#endif

95
bsl/csl/stm32f042/Src/usart.c
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@ -21,25 +21,11 @@
#include"pin.h"
#define CR1_TE_EN (1U << 3)
#define CR1_UE_EN (1U << 0)
#define ISR_TXE (1U << 7)
#define UART_BAUD 115200
#define SYST_CLK 8000000
#define AF1 0x01
#define USART_CHANNEL ((USART_TypeDef *)channel)
void print_Usart(char *ptr)
{
uint16_t len = 0;
while(ptr[len] != '\0')
{
usartSendChar(ptr[len]);
len++;
}
}
void usartInit( usartNo_t channel,
pinNo_t pinTx,
@ -47,7 +33,7 @@ void usartInit( usartNo_t channel,
uint32_t baud,
usartWordLength_t lenght,
uint8_t parity,
uint8_t hwFlowControl)
usartHwFlowCtrl_t flowCtrl)
{
/* COnfiguring teh pins for the uart*/
usartInitTx(pinTx);
@ -63,13 +49,20 @@ void usartInit( usartNo_t channel,
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
}
usartSetBaudRate(channel,baud);
//enables the transmit and sets all the other values to 0 = Default
USART_CHANNEL->CR1 = CR1_TE_EN; // The = 0 is on purpose to set uart to default mode.
USART_CHANNEL->CR1 = 0; // The = 0 is on purpose to set uart to default mode.
USART_CHANNEL->CR2 = 0; // The = 0 is on purpose to set uart to default mode.
USART_CHANNEL->CR3 = 0; // The = 0 is on purpose to set uart to default mode.
USART_CHANNEL->CR1 |= USART_CR1_TE; //Enbale trasnmit
USART_CHANNEL->CR1 |= USART_CR1_RE; //Enable recieve
//UART Enable
USART_CHANNEL->CR1 |= CR1_UE_EN;
usartSetBaudRate(channel,baud);
usartSetWordLenght(channel, lenght);
usartSetHwFlowCtrl(channel, flowCtrl);
//UART Enable shall be allwas date a th ene of configuration.
USART_CHANNEL->CR1 |= USART_CR1_UE;
}
void usartInitTx(pinNo_t pinTx)
@ -84,9 +77,24 @@ void usartInitRx(pinNo_t pinRx)
pinSetAlternate(pinRx, AF1);
}
//this one is special as the register bist's don't follow eachother.
void usartSetWordLenght(usartNo_t channel, usartWordLength_t lenght)
{
if(lenght == seven)
{
USART_CHANNEL->CR1 |= USART_CR1_M1;
USART_CHANNEL->CR1 &= ~USART_CR1_M0;
}
else if (lenght == eight)
{
USART_CHANNEL->CR1 &= ~USART_CR1_M0;
USART_CHANNEL->CR1 &= ~USART_CR1_M1;
}
else if(lenght == nine)
{
USART_CHANNEL->CR1 &= ~USART_CR1_M1;
USART_CHANNEL->CR1 |= USART_CR1_M0;
}
}
static uint16_t usartComputeBaudRate(uint32_t clk, uint32_t baud)
@ -100,9 +108,42 @@ void usartSetBaudRate(usartNo_t channel, uint32_t baud)
USART_CHANNEL->BRR = usartComputeBaudRate(SYST_CLK,baud);
}
void usartSendChar(int ch)
void usartSetHwFlowCtrl(usartNo_t channel, usartHwFlowCtrl_t flowCtrl)
{
if(flowCtrl == noFlowControl)
{
USART_CHANNEL->CR3 &= ~USART_CR3_CTSE;
USART_CHANNEL->CR3 &= ~USART_CR3_RTSE;
}
else if(flowCtrl == cts)
{
USART_CHANNEL->CR3 |= USART_CR3_CTSE;
}
else if(flowCtrl == rts)
{
USART_CHANNEL->CR3 |= USART_CR3_RTSE;
}
else if(flowCtrl == ctsRts)
{
USART_CHANNEL->CR3 |= USART_CR3_CTSE;
USART_CHANNEL->CR3 |= USART_CR3_RTSE;
}
}
void print_Usart(char *ptr)
{
uint16_t len = 0;
while(ptr[len] != '\0')
{
usartSendChar(ptr[len]);
len++;
}
}
void usartSendChar(uint8_t ch)
{
// Make sure that TX buffer is empty
while(!(USART2->ISR & ISR_TXE)){}
USART2->TDR = (ch & 0xFF);
while(!(USART2->ISR & USART_ISR_TXE)){}
USART2->TDR = ch;
}

4
main.cpp
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@ -16,8 +16,8 @@ int main(int argc, char *argv[])
pinA15,
115200,
eight,
0,
0);
NO_PARITY_CTRL,
noFlowControl);
print_Usart("Wellcome to our KED project\n\r");

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