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