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gex-core/units/usart/_usart_api.c

56 lines
1.3 KiB

//
// Created by MightyPork on 2018/02/03.
//
#include "platform.h"
#include "unit_base.h"
#include "unit_usart.h"
#define UUSART_INTERNAL
#include "_usart_internal.h"
error_t UU_USART_Write(Unit *unit, const uint8_t *buffer, uint32_t len)
{
CHECK_TYPE(unit, &UNIT_USART);
struct priv *priv = unit->data;
uint32_t t_start = HAL_GetTick();
while (len > 0) {
// this should be long enough even for the slowest bitrates and 512 bytes
if (HAL_GetTick() - t_start > 5000) {
return E_HW_TIMEOUT;
}
uint16_t chunk = UUSART_DMA_TxQueue(priv, buffer, (uint16_t) len);
buffer += chunk;
len -= chunk;
// We give up control if there's another thread waiting and this isn't the last cycle
if (len > 0) {
osThreadYield();
}
}
return E_SUCCESS;
}
error_t UU_USART_WriteSync(Unit *unit, const uint8_t *buffer, uint32_t len)
{
CHECK_TYPE(unit, &UNIT_USART);
struct priv *priv = unit->data;
TRY(UU_USART_Write(unit, buffer, len));
// Now wait for the last DMA to complete
uint32_t t_start = HAL_GetTick();
while (priv->tx_dma_busy) {
if (HAL_GetTick() - t_start > 1000) {
return E_HW_TIMEOUT;
}
}
return E_SUCCESS;
}