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aux_serial: Refined how flip-flopping between the two transmit buffers is achieved

This commit is contained in:
dragonmux 2022-08-19 10:53:31 +01:00 committed by Piotr Esden-Tempski
parent 52e9065426
commit 98a2b4d350
1 changed files with 9 additions and 10 deletions
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19
src/platforms/common/aux_serial.c
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@ -35,9 +35,8 @@
#include "aux_serial.h"
#if defined(STM32F0) || defined(STM32F1) || defined(STM32F3) || defined(STM32F4)
static char aux_serial_transmit_buffer[TX_BUF_SIZE * 2];
/* Active buffer part idx */
static uint8_t buf_tx_act_idx;
static char aux_serial_transmit_buffer[TX_BUF_SIZE * 2U];
static uint8_t aux_serial_transmit_buffer_index;
#elif defined(LM4F)
static char aux_serial_transmit_buffer[FIFO_SIZE];
#endif
@ -83,6 +82,11 @@ void aux_serial_set_encoding(struct usb_cdc_line_coding *coding)
}
#if defined(STM32F0) || defined(STM32F1) || defined(STM32F3) || defined(STM32F4)
char *aux_serial_current_transmit_buffer(void)
{
return aux_serial_transmit_buffer + (aux_serial_transmit_buffer_index << USART_DMA_BUF_SHIFT);
}
/*
* Changes USBUSART TX buffer in which data is accumulated from USB.
* Filled buffer is submitted to DMA for transfer.
@ -90,7 +94,7 @@ void aux_serial_set_encoding(struct usb_cdc_line_coding *coding)
void aux_serial_switch_transmit_buffers(void)
{
/* Select buffer for transmission */
char *const tx_buf_ptr = &aux_serial_transmit_buffer[buf_tx_act_idx * TX_BUF_SIZE];
char *const tx_buf_ptr = aux_serial_current_transmit_buffer();
/* Configure DMA */
dma_set_memory_address(USBUSART_DMA_BUS, USBUSART_DMA_TX_CHAN, (uintptr_t)tx_buf_ptr);
@ -99,12 +103,7 @@ void aux_serial_switch_transmit_buffers(void)
/* Change active buffer */
buf_tx_act_sz = 0;
buf_tx_act_idx ^= 1;
}
char *aux_serial_current_transmit_buffer(void)
{
return aux_serial_transmit_buffer + (buf_tx_act_idx * TX_BUF_SIZE);
aux_serial_transmit_buffer_index ^= 1;
}
#elif defined(LM4F)