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Configure usart's rx with dma

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This commit is contained in:
Steins7 2023-07-10 11:30:51 +02:00
parent c571343de1
commit 46776ebfd3
2 changed files with 80 additions and 12 deletions
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86
drivers/usart.c
View File

@ -12,6 +12,9 @@
#include "reg.h"
#include "rcc.h"
#include "dma.h"
#include "stddef.h"
//--local definitions-----------------------------------------------------------
@ -20,14 +23,23 @@ static volatile struct USART* const usart1 = (struct USART*)USART1_BASE_ADDRESS;
static volatile struct USART* const usart2 = (struct USART*)USART2_BASE_ADDRESS;
static volatile struct USART* const usart3 = (struct USART*)USART3_BASE_ADDRESS;
void configure_usart(volatile struct USART* regs, enum UsartConfig config);
void configure_baudrate(volatile struct USART* regs, uint32_t clock,
static void configure_usart(volatile struct USART* regs,
enum UsartConfig config);
static void configure_baudrate(volatile struct USART* regs, uint32_t clock,
uint32_t baudrate);
uint32_t periph_regs(enum UsartPeriph periph, volatile struct USART** regs);
static uint32_t periph_regs(enum UsartPeriph periph,
volatile struct USART** regs);
static uint32_t read_from_buffer(volatile uint8_t* buffer,
enum DmaChannel channel, uint8_t* byte);
static void usart1_rx_callback(enum DmaIRQSource src);
//--local variables-------------------------------------------------------------
static volatile uint8_t* usart1_rx_buffer;
//--public functions------------------------------------------------------------
void usart_configure(enum UsartPeriph periph, enum UsartConfig config,
@ -75,21 +87,58 @@ uint32_t usart_write_byte(enum UsartPeriph periph, uint8_t byte)
uint32_t usart_read_byte(enum UsartPeriph periph, uint8_t* byte)
{
volatile struct USART* regs;
if (periph_regs(periph, &regs)) {
return 1;
volatile uint8_t* buffer;
enum DmaChannel dma_channel;
switch (periph) {
case USART_PERIPH_1:
regs = usart1;
buffer = usart1_rx_buffer;
dma_channel = DMA_CHANNEL_5;
break;
case USART_PERIPH_2:
case USART_PERIPH_3:
default:
return 1;
break;
}
if (regs->SR.RXNE) {
*byte = regs->DR.DR;
return 0;
if (buffer) {
return read_from_buffer(buffer, dma_channel, byte);
} else {
return 1;
if (regs->SR.RXNE) {
*byte = regs->DR.DR;
return 0;
} else {
return 1;
}
}
}
void usart_set_rx_buffer(enum UsartPeriph periph, uint8_t* buffer,
uint16_t size)
{
switch (periph) {
case USART_PERIPH_1:
dma_configure(DMA_PERIPH_1, DMA_CHANNEL_5,
DMA_CONFIG_IRQ_COMPLETE | DMA_CONFIG_FROM_PERIPH
| DMA_CONFIG_CIRCULAR | DMA_CONFIG_INC_MEM
| DMA_CONFIG_PSIZE_8BITS | DMA_CONFIG_MSIZE_8BITS
| DMA_CONFIG_PRIO_LOW, (void*)&usart1->DR, buffer,
size, usart1_rx_callback);
usart1_rx_buffer = buffer;
reg_set(usart1->CR3, USART_CR3_DMAR);
break;
case USART_PERIPH_2:
break;
case USART_PERIPH_3:
break;
}
}
//--local functions-------------------------------------------------------------
void configure_usart(volatile struct USART* regs, enum UsartConfig config)
static void configure_usart(volatile struct USART* regs, enum UsartConfig config)
{
//configure parity
switch (config)
@ -165,7 +214,7 @@ void configure_usart(volatile struct USART* regs, enum UsartConfig config)
reg_set(regs->CR1, USART_CR1_UE);
}
void configure_baudrate(volatile struct USART* regs, uint32_t clock,
static void configure_baudrate(volatile struct USART* regs, uint32_t clock,
uint32_t baudrate)
{
uint32_t mantissa = clock / (baudrate * 16);
@ -178,7 +227,7 @@ void configure_baudrate(volatile struct USART* regs, uint32_t clock,
reg_write(regs->BRR, USART_BRR_DIV_Fraction, divider & 0xF);
}
uint32_t periph_regs(enum UsartPeriph periph, volatile struct USART** regs)
static uint32_t periph_regs(enum UsartPeriph periph, volatile struct USART** regs)
{
switch (periph) {
case USART_PERIPH_1:
@ -198,3 +247,16 @@ uint32_t periph_regs(enum UsartPeriph periph, volatile struct USART** regs)
return 0;
}
static uint32_t read_from_buffer(volatile uint8_t* buffer,
enum DmaChannel channel, uint8_t* byte)
{
}
//--callbacks-------------------------------------------------------------------
static void usart1_rx_callback(enum DmaIRQSource src)
{
}

6
drivers/usart.h
View File

@ -46,6 +46,12 @@ uint32_t usart_write_byte(enum UsartPeriph periph, uint8_t byte);
uint32_t usart_read_byte(enum UsartPeriph periph, uint8_t* byte);
void usart_set_tx_buffer(enum UsartPeriph periph, uint8_t* buffer,
uint16_t size);
void usart_set_rx_buffer(enum UsartPeriph periph, uint8_t* buffer,
uint16_t size);
#endif //_USART_H_