amiro-os / kernel / patches / I2C-without-DMA.patch @ 4684a9d9
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| 1 |
diff --git a/os/hal/ports/STM32/LLD/I2Cv1/hal_i2c_lld.c b/os/hal/ports/STM32/LLD/I2Cv1/hal_i2c_lld.c
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|---|---|
| 2 |
--- a/os/hal/ports/STM32/LLD/I2Cv1/hal_i2c_lld.c
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| 3 |
+++ b/os/hal/ports/STM32/LLD/I2Cv1/hal_i2c_lld.c
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| 4 |
@@ -34,6 +34,7 @@
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| 5 |
/* Driver local definitions. */
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| 6 |
/*===========================================================================*/
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| 7 |
|
| 8 |
+#if STM32_I2C_I2C1_USE_DMA
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#define I2C1_RX_DMA_CHANNEL \ |
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STM32_DMA_GETCHANNEL(STM32_I2C_I2C1_RX_DMA_STREAM, \
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STM32_I2C1_RX_DMA_CHN) |
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@@ -41,7 +42,9 @@
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#define I2C1_TX_DMA_CHANNEL \ |
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STM32_DMA_GETCHANNEL(STM32_I2C_I2C1_TX_DMA_STREAM, \
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STM32_I2C1_TX_DMA_CHN) |
| 16 |
+#endif
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| 17 |
|
| 18 |
+#if STM32_I2C_I2C2_USE_DMA
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#define I2C2_RX_DMA_CHANNEL \ |
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STM32_DMA_GETCHANNEL(STM32_I2C_I2C2_RX_DMA_STREAM, \
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STM32_I2C2_RX_DMA_CHN) |
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@@ -49,7 +52,9 @@
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#define I2C2_TX_DMA_CHANNEL \ |
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STM32_DMA_GETCHANNEL(STM32_I2C_I2C2_TX_DMA_STREAM, \
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STM32_I2C2_TX_DMA_CHN) |
| 26 |
+#endif
|
| 27 |
|
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+#if STM32_I2C_I2C3_USE_DMA
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| 29 |
#define I2C3_RX_DMA_CHANNEL \ |
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STM32_DMA_GETCHANNEL(STM32_I2C_I2C3_RX_DMA_STREAM, \
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STM32_I2C3_RX_DMA_CHN) |
| 32 |
@@ -57,6 +62,7 @@
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#define I2C3_TX_DMA_CHANNEL \ |
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STM32_DMA_GETCHANNEL(STM32_I2C_I2C3_TX_DMA_STREAM, \
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STM32_I2C3_TX_DMA_CHN) |
| 36 |
+#endif
|
| 37 |
|
| 38 |
/*===========================================================================*/
|
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/* Driver constants. */
|
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@@ -72,6 +78,20 @@
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| 41 |
#define I2C_EV6_MASTER_REC_MODE_SELECTED \ |
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((uint32_t)(((I2C_SR2_MSL | I2C_SR2_BUSY)<< 16) | I2C_SR1_ADDR))
|
| 43 |
|
| 44 |
+#define I2C_EV7_MASTER_REC_BYTE_RECEIVED \
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+ ((uint32_t)(((I2C_SR2_MSL | I2C_SR2_BUSY)<< 16) | I2C_SR1_RXNE))
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+
|
| 47 |
+#define I2C_EV7_MASTER_REC_BYTE_RECEIVED_STOP \
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+ ((uint32_t)(I2C_SR1_RXNE))
|
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+
|
| 50 |
+#define I2C_EV7_2_EV7_3_MASTER_REC_BYTE_QUEUED \
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+ ((uint32_t)(((I2C_SR2_MSL | I2C_SR2_BUSY)<< 16) | \
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+ I2C_SR1_BTF | I2C_SR1_RXNE))
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| 53 |
+
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+#define I2C_EV8_MASTER_BYTE_TRANSMITTING \
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+ ((uint32_t)(((I2C_SR2_MSL | I2C_SR2_BUSY | I2C_SR2_TRA)<< 16) | \
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+ I2C_SR1_TXE))
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+
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#define I2C_EV8_2_MASTER_BYTE_TRANSMITTED \ |
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((uint32_t)(((I2C_SR2_MSL | I2C_SR2_BUSY | I2C_SR2_TRA) << 16) | \ |
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I2C_SR1_BTF | I2C_SR1_TXE)) |
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@@ -129,8 +149,24 @@ static void i2c_lld_abort_operation(I2CDriver *i2cp) { |
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dp->SR1 = 0;
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/* Stops the associated DMA streams.*/
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- dmaStreamDisable(i2cp->dmatx);
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- dmaStreamDisable(i2cp->dmarx);
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+#if STM32_I2C_USE_I2C1 && STM32_I2C_I2C1_USE_DMA
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+ if (&I2CD1 == i2cp) {
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+ dmaStreamDisable(i2cp->dmatx);
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+ dmaStreamDisable(i2cp->dmarx);
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+ }
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+#endif
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+#if STM32_I2C_USE_I2C2 && STM32_I2C_I2C2_USE_DMA
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+ if (&I2CD2 == i2cp) {
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+ dmaStreamDisable(i2cp->dmatx);
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+ dmaStreamDisable(i2cp->dmarx);
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+ }
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+#endif
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+#if STM32_I2C_USE_I2C3 && STM32_I2C_I2C3_USE_DMA
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+ if (&I2CD3 == i2cp) {
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+ dmaStreamDisable(i2cp->dmatx);
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+ dmaStreamDisable(i2cp->dmarx);
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+ }
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+#endif
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} |
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|
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/**
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@@ -235,14 +271,18 @@ static void i2c_lld_set_opmode(I2CDriver *i2cp) { |
| 89 |
dp->CR1 = regCR1; |
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} |
| 91 |
|
| 92 |
+#if (STM32_I2C_USE_I2C1 && STM32_I2C_I2C1_USE_DMA) || \
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+ (STM32_I2C_USE_I2C2 && STM32_I2C_I2C2_USE_DMA) || \
|
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+ (STM32_I2C_USE_I2C3 && STM32_I2C_I2C3_USE_DMA) || \
|
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+ defined(__DOXYGEN__)
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/**
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- * @brief I2C shared ISR code.
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+ * @brief I2C shared ISR code for DMA access.
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* |
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* @param[in] i2cp pointer to the @p I2CDriver object |
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* |
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* @notapi
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*/ |
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-static void i2c_lld_serve_event_interrupt(I2CDriver *i2cp) {
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+static void i2c_lld_serve_event_interrupt_dma(I2CDriver *i2cp) {
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I2C_TypeDef *dp = i2cp->i2c; |
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uint32_t regSR2 = dp->SR2; |
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uint32_t event = dp->SR1; |
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@@ -252,7 +292,7 @@ static void i2c_lld_serve_event_interrupt(I2CDriver *i2cp) { |
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done by the DMA.*/ |
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switch (I2C_EV_MASK & (event | (regSR2 << 16))) { |
| 112 |
case I2C_EV5_MASTER_MODE_SELECT:
|
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- if ((i2cp->addr >> 8) > 0) {
|
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+ if ((i2cp->addr >> 8) > 0) {
|
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/* 10-bit address: 1 1 1 1 0 X X R/W */
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dp->DR = 0xF0 | (0x6 & (i2cp->addr >> 8)) | (0x1 & i2cp->addr); |
| 117 |
} else {
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@@ -293,7 +333,146 @@ static void i2c_lld_serve_event_interrupt(I2CDriver *i2cp) { |
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if (event & (I2C_SR1_ADDR | I2C_SR1_ADD10))
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(void)dp->SR2;
|
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} |
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+#endif /* any I2CDx uses DMA mode */
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+
|
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+#if (STM32_I2C_USE_I2C1 && !STM32_I2C_I2C1_USE_DMA) || \
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+ (STM32_I2C_USE_I2C2 && !STM32_I2C_I2C2_USE_DMA) || \
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+ (STM32_I2C_USE_I2C3 && !STM32_I2C_I2C3_USE_DMA) || \
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+ defined(__DOXYGEN__)
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+/**
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+ * @brief I2C shared ISR code for non-DMA access.
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+ *
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+ * @param[in] i2cp pointer to the @p I2CDriver object
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+ *
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+ * @notapi
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| 134 |
+ */
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+static void i2c_lld_serve_event_interrupt_isr(I2CDriver *i2cp) {
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+ I2C_TypeDef *dp = i2cp->i2c;
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+ uint32_t regSR2 = dp->SR2;
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+ uint32_t event = dp->SR1;
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+
|
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+ switch (I2C_EV_MASK & (event | (regSR2 << 16))) {
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+ case I2C_EV5_MASTER_MODE_SELECT:
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+ dp->CR2 |= I2C_CR2_ITBUFEN;
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+ dp->DR = i2cp->addr;
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+ break;
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+ case I2C_EV6_MASTER_TRA_MODE_SELECTED:
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+ (void)dp->SR2; // clear ADDR flag
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+ /* EV8_1 */
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+ dp->DR = *(i2cp->txbuf);
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+
|
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+ ++i2cp->txbuf;
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+ --i2cp->txbytes;
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+
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+ /* if N == 1, skip the I2C_EV8_MASTER_BYTE_TRANSMITTING event
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+ * but enter I2C_EV8_2_MASTER_BYTE_TRANSMITTED next */
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| 155 |
+ if (i2cp->txbytes == 0) {
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+ dp->CR2 &= ~I2C_CR2_ITBUFEN;
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+ }
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| 158 |
+ break;
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| 159 |
+ case I2C_EV6_MASTER_REC_MODE_SELECTED:
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| 160 |
+ switch (i2cp->rxbytes) {
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| 161 |
+ case 1:
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| 162 |
+ dp->CR1 &= ~I2C_CR1_ACK;
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+ (void)dp->SR2; // clear ADDR flag
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+ dp->CR1 |= I2C_CR1_STOP;
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+ break;
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| 166 |
+ case 2:
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| 167 |
+ (void)dp->SR2; // clear ADDR flag
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+ /* EV6_1 */
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+ dp->CR1 |= I2C_CR1_POS;
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| 170 |
+ dp->CR1 &= ~I2C_CR1_ACK;
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| 171 |
+ dp->CR2 &= ~I2C_CR2_ITBUFEN;
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+ break;
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+ case 3: /* N == 3 is a very special case, since EV7 is completely skipped */
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+ (void)dp->SR2; // clear ADDR flag
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+ /* Disable the I2C_EV7_MASTER_REC_BYTE_RECEIVED event
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+ * but enter I2C_EV7_MASTER_REC_BYTE_RECEIVED_STOP next */
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+ dp->CR2 &= ~I2C_CR2_ITBUFEN;
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+ break;
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+ default: /* N > 2 */
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+ (void)dp->SR2; // clear ADDR flag
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+ break;
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| 182 |
+ }
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| 183 |
+ break;
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+ case I2C_EV7_MASTER_REC_BYTE_RECEIVED:
|
| 185 |
+ if (i2cp->rxbytes > 3) {
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+ *(i2cp->rxbuf) = dp->DR;
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+ ++i2cp->rxbuf;
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+ --i2cp->rxbytes;
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| 189 |
+ }
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| 190 |
+ if (i2cp->rxbytes == 3) {
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| 191 |
+ /* Disable this event for DataN-2, but force into event
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| 192 |
+ * I2C_EV7_2_EV7_3_MASTER_REC_BYTE_RECEIVED_QUEUED by not reading dp->DR. */
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| 193 |
+ dp->CR2 &= ~I2C_CR2_ITBUFEN;
|
| 194 |
+ }
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+ break;
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+ case I2C_EV7_MASTER_REC_BYTE_RECEIVED_STOP:
|
| 197 |
+ osalDbgAssert(i2cp->rxbytes == 1, "more than 1 byte to be received");
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| 198 |
+ *(i2cp->rxbuf) = dp->DR;
|
| 199 |
+ --i2cp->rxbytes;
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| 200 |
+ dp->CR2 &= ~(I2C_CR2_ITEVTEN | I2C_CR2_ITBUFEN);
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| 201 |
+ _i2c_wakeup_isr(i2cp);
|
| 202 |
+ break;
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| 203 |
+ case I2C_EV7_2_EV7_3_MASTER_REC_BYTE_QUEUED:
|
| 204 |
+ if (i2cp->rxbytes == 3) {
|
| 205 |
+ /* EV7_2 (N > 2) */
|
| 206 |
+ dp->CR1 &= ~I2C_CR1_ACK;
|
| 207 |
+ *(i2cp->rxbuf) = dp->DR;
|
| 208 |
+ ++i2cp->rxbuf;
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+ dp->CR1 |= I2C_CR1_STOP;
|
| 210 |
+ *(i2cp->rxbuf) = dp->DR;
|
| 211 |
+ ++i2cp->rxbuf;
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| 212 |
+ i2cp->rxbytes -= 2;
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+ /* enable I2C_EV7_MASTER_REC_BYTE_RECEIVED_STOP event */
|
| 214 |
+ dp->CR2 |= I2C_CR2_ITBUFEN;
|
| 215 |
+ } else {
|
| 216 |
+ /* EV7_3 (N == 2) */
|
| 217 |
+ dp->CR1 |= I2C_CR1_STOP;
|
| 218 |
+ *(i2cp->rxbuf) = dp->DR;
|
| 219 |
+ ++i2cp->rxbuf;
|
| 220 |
+ *(i2cp->rxbuf) = dp->DR;
|
| 221 |
+ i2cp->rxbytes -= 2;
|
| 222 |
+
|
| 223 |
+ dp->CR1 &= ~I2C_CR1_POS;
|
| 224 |
+ dp->CR2 &= ~(I2C_CR2_ITEVTEN | I2C_CR2_ITBUFEN);
|
| 225 |
+
|
| 226 |
+ _i2c_wakeup_isr(i2cp);
|
| 227 |
+ }
|
| 228 |
+ break;
|
| 229 |
+ case I2C_EV8_MASTER_BYTE_TRANSMITTING:
|
| 230 |
+ dp->DR = *(i2cp->txbuf);
|
| 231 |
+ ++i2cp->txbuf;
|
| 232 |
+ --i2cp->txbytes;
|
| 233 |
+
|
| 234 |
+ /* if this was the last byte, ensure that this event is not entered again */
|
| 235 |
+ if (i2cp->txbytes == 0) {
|
| 236 |
+ dp->CR2 &= ~I2C_CR2_ITBUFEN;
|
| 237 |
+ }
|
| 238 |
+ break;
|
| 239 |
+ case I2C_EV8_2_MASTER_BYTE_TRANSMITTED:
|
| 240 |
+ if (i2cp->rxbytes > 0) {
|
| 241 |
+ /* start "read after write" operation (LSB of address = 1 => read) */
|
| 242 |
+ i2cp->addr |= 0x01;
|
| 243 |
+ dp->CR1 |= I2C_CR1_START | I2C_CR1_ACK;
|
| 244 |
+ } else {
|
| 245 |
+ dp->CR1 |= I2C_CR1_STOP;
|
| 246 |
+ dp->CR2 &= ~(I2C_CR2_ITEVTEN | I2C_CR2_ITBUFEN);
|
| 247 |
+ _i2c_wakeup_isr(i2cp);
|
| 248 |
+ }
|
| 249 |
+ break;
|
| 250 |
+ default:
|
| 251 |
+ osalDbgAssert(i2cp->rxbytes != 1, "more than 1 byte to be received");
|
| 252 |
+ break;
|
| 253 |
+ }
|
| 254 |
+}
|
| 255 |
+#endif /* any I2CDx uses non-DMA mode */
|
| 256 |
|
| 257 |
+
|
| 258 |
+#if (STM32_I2C_USE_I2C1 && STM32_I2C_I2C1_USE_DMA) || \
|
| 259 |
+ (STM32_I2C_USE_I2C2 && STM32_I2C_I2C2_USE_DMA) || \
|
| 260 |
+ (STM32_I2C_USE_I2C3 && STM32_I2C_I2C3_USE_DMA) || \
|
| 261 |
+ defined(__DOXYGEN__)
|
| 262 |
/**
|
| 263 |
* @brief DMA RX end IRQ handler.
|
| 264 |
* |
| 265 |
@@ -347,6 +526,7 @@ static void i2c_lld_serve_tx_end_irq(I2CDriver *i2cp, uint32_t flags) { |
| 266 |
of R/W transaction itself.*/ |
| 267 |
dp->CR2 |= I2C_CR2_ITEVTEN; |
| 268 |
} |
| 269 |
+#endif /* any I2CDx uses DMA mode */
|
| 270 |
|
| 271 |
/**
|
| 272 |
* @brief I2C error handler.
|
| 273 |
@@ -359,8 +539,24 @@ static void i2c_lld_serve_tx_end_irq(I2CDriver *i2cp, uint32_t flags) { |
| 274 |
static void i2c_lld_serve_error_interrupt(I2CDriver *i2cp, uint16_t sr) { |
| 275 |
|
| 276 |
/* Clears interrupt flags just to be safe.*/
|
| 277 |
- dmaStreamDisable(i2cp->dmatx);
|
| 278 |
- dmaStreamDisable(i2cp->dmarx);
|
| 279 |
+#if STM32_I2C_USE_I2C1 && STM32_I2C_I2C1_USE_DMA
|
| 280 |
+ if (&I2CD1 == i2cp) {
|
| 281 |
+ dmaStreamDisable(i2cp->dmatx);
|
| 282 |
+ dmaStreamDisable(i2cp->dmarx);
|
| 283 |
+ }
|
| 284 |
+#endif
|
| 285 |
+#if STM32_I2C_USE_I2C2 && STM32_I2C_I2C2_USE_DMA
|
| 286 |
+ if (&I2CD2 == i2cp) {
|
| 287 |
+ dmaStreamDisable(i2cp->dmatx);
|
| 288 |
+ dmaStreamDisable(i2cp->dmarx);
|
| 289 |
+ }
|
| 290 |
+#endif
|
| 291 |
+#if STM32_I2C_USE_I2C3 && STM32_I2C_I2C3_USE_DMA
|
| 292 |
+ if (&I2CD3 == i2cp) {
|
| 293 |
+ dmaStreamDisable(i2cp->dmatx);
|
| 294 |
+ dmaStreamDisable(i2cp->dmarx);
|
| 295 |
+ }
|
| 296 |
+#endif
|
| 297 |
|
| 298 |
i2cp->errors = I2C_NO_ERROR; |
| 299 |
|
| 300 |
@@ -407,7 +603,11 @@ OSAL_IRQ_HANDLER(STM32_I2C1_EVENT_HANDLER) {
|
| 301 |
|
| 302 |
OSAL_IRQ_PROLOGUE(); |
| 303 |
|
| 304 |
- i2c_lld_serve_event_interrupt(&I2CD1);
|
| 305 |
+#if STM32_I2C_I2C1_USE_DMA
|
| 306 |
+ i2c_lld_serve_event_interrupt_dma(&I2CD1);
|
| 307 |
+#else
|
| 308 |
+ i2c_lld_serve_event_interrupt_isr(&I2CD1);
|
| 309 |
+#endif
|
| 310 |
|
| 311 |
OSAL_IRQ_EPILOGUE(); |
| 312 |
} |
| 313 |
@@ -437,7 +637,11 @@ OSAL_IRQ_HANDLER(STM32_I2C2_EVENT_HANDLER) {
|
| 314 |
|
| 315 |
OSAL_IRQ_PROLOGUE(); |
| 316 |
|
| 317 |
- i2c_lld_serve_event_interrupt(&I2CD2);
|
| 318 |
+#if STM32_I2C_I2C2_USE_DMA
|
| 319 |
+ i2c_lld_serve_event_interrupt_dma(&I2CD2);
|
| 320 |
+#else
|
| 321 |
+ i2c_lld_serve_event_interrupt_isr(&I2CD2);
|
| 322 |
+#endif
|
| 323 |
|
| 324 |
OSAL_IRQ_EPILOGUE(); |
| 325 |
} |
| 326 |
@@ -469,7 +673,11 @@ OSAL_IRQ_HANDLER(STM32_I2C3_EVENT_HANDLER) {
|
| 327 |
|
| 328 |
OSAL_IRQ_PROLOGUE(); |
| 329 |
|
| 330 |
- i2c_lld_serve_event_interrupt(&I2CD3);
|
| 331 |
+#if STM32_I2C_I2C3_USE_DMA
|
| 332 |
+ i2c_lld_serve_event_interrupt_dma(&I2CD3);
|
| 333 |
+#else
|
| 334 |
+ i2c_lld_serve_event_interrupt_isr(&I2CD3);
|
| 335 |
+#endif
|
| 336 |
|
| 337 |
OSAL_IRQ_EPILOGUE(); |
| 338 |
} |
| 339 |
@@ -540,19 +748,22 @@ void i2c_lld_start(I2CDriver *i2cp) { |
| 340 |
/* If in stopped state then enables the I2C and DMA clocks.*/
|
| 341 |
if (i2cp->state == I2C_STOP) {
|
| 342 |
|
| 343 |
- i2cp->txdmamode = STM32_DMA_CR_PSIZE_BYTE | STM32_DMA_CR_MSIZE_BYTE |
|
| 344 |
- STM32_DMA_CR_MINC | STM32_DMA_CR_DMEIE |
|
| 345 |
- STM32_DMA_CR_TEIE | STM32_DMA_CR_TCIE |
|
| 346 |
- STM32_DMA_CR_DIR_M2P;
|
| 347 |
- i2cp->rxdmamode = STM32_DMA_CR_PSIZE_BYTE | STM32_DMA_CR_MSIZE_BYTE |
|
| 348 |
- STM32_DMA_CR_MINC | STM32_DMA_CR_DMEIE |
|
| 349 |
- STM32_DMA_CR_TEIE | STM32_DMA_CR_TCIE |
|
| 350 |
- STM32_DMA_CR_DIR_P2M;
|
| 351 |
-
|
| 352 |
#if STM32_I2C_USE_I2C1
|
| 353 |
if (&I2CD1 == i2cp) {
|
| 354 |
+#if STM32_I2C_I2C1_USE_DMA
|
| 355 |
+ i2cp->txdmamode = STM32_DMA_CR_PSIZE_BYTE | STM32_DMA_CR_MSIZE_BYTE |
|
| 356 |
+ STM32_DMA_CR_MINC | STM32_DMA_CR_DMEIE |
|
| 357 |
+ STM32_DMA_CR_TEIE | STM32_DMA_CR_TCIE |
|
| 358 |
+ STM32_DMA_CR_DIR_M2P;
|
| 359 |
+ i2cp->rxdmamode = STM32_DMA_CR_PSIZE_BYTE | STM32_DMA_CR_MSIZE_BYTE |
|
| 360 |
+ STM32_DMA_CR_MINC | STM32_DMA_CR_DMEIE |
|
| 361 |
+ STM32_DMA_CR_TEIE | STM32_DMA_CR_TCIE |
|
| 362 |
+ STM32_DMA_CR_DIR_P2M;
|
| 363 |
+#endif
|
| 364 |
+
|
| 365 |
rccResetI2C1(); |
| 366 |
|
| 367 |
+#if STM32_I2C_I2C1_USE_DMA
|
| 368 |
i2cp->dmarx = dmaStreamAllocI(STM32_I2C_I2C1_RX_DMA_STREAM, |
| 369 |
STM32_I2C_I2C1_IRQ_PRIORITY, |
| 370 |
(stm32_dmaisr_t)i2c_lld_serve_rx_end_irq, |
| 371 |
@@ -563,22 +774,50 @@ void i2c_lld_start(I2CDriver *i2cp) { |
| 372 |
(stm32_dmaisr_t)i2c_lld_serve_tx_end_irq, |
| 373 |
(void *)i2cp);
|
| 374 |
osalDbgAssert(i2cp->dmatx != NULL, "unable to allocate stream"); |
| 375 |
+#endif
|
| 376 |
|
| 377 |
rccEnableI2C1(true);
|
| 378 |
nvicEnableVector(I2C1_EV_IRQn, STM32_I2C_I2C1_IRQ_PRIORITY); |
| 379 |
nvicEnableVector(I2C1_ER_IRQn, STM32_I2C_I2C1_IRQ_PRIORITY); |
| 380 |
|
| 381 |
+#if STM32_I2C_I2C1_USE_DMA
|
| 382 |
i2cp->rxdmamode |= STM32_DMA_CR_CHSEL(I2C1_RX_DMA_CHANNEL) | |
| 383 |
STM32_DMA_CR_PL(STM32_I2C_I2C1_DMA_PRIORITY); |
| 384 |
i2cp->txdmamode |= STM32_DMA_CR_CHSEL(I2C1_TX_DMA_CHANNEL) | |
| 385 |
STM32_DMA_CR_PL(STM32_I2C_I2C1_DMA_PRIORITY); |
| 386 |
+
|
| 387 |
+ /* I2C registers pointed by the DMA.*/
|
| 388 |
+ dmaStreamSetPeripheral(i2cp->dmarx, &dp->DR);
|
| 389 |
+ dmaStreamSetPeripheral(i2cp->dmatx, &dp->DR);
|
| 390 |
+#endif
|
| 391 |
+
|
| 392 |
+ /* Reset i2c peripheral.*/
|
| 393 |
+ dp->CR1 = I2C_CR1_SWRST;
|
| 394 |
+ dp->CR1 = 0;
|
| 395 |
+#if STM32_I2C_I2C1_USE_DMA
|
| 396 |
+ dp->CR2 = I2C_CR2_ITERREN | I2C_CR2_DMAEN;
|
| 397 |
+#else
|
| 398 |
+ dp->CR2 = I2C_CR2_ITERREN;
|
| 399 |
+#endif
|
| 400 |
} |
| 401 |
#endif /* STM32_I2C_USE_I2C1 */ |
| 402 |
|
| 403 |
#if STM32_I2C_USE_I2C2
|
| 404 |
if (&I2CD2 == i2cp) {
|
| 405 |
+#if STM32_I2C_I2C2_USE_DMA
|
| 406 |
+ i2cp->txdmamode = STM32_DMA_CR_PSIZE_BYTE | STM32_DMA_CR_MSIZE_BYTE |
|
| 407 |
+ STM32_DMA_CR_MINC | STM32_DMA_CR_DMEIE |
|
| 408 |
+ STM32_DMA_CR_TEIE | STM32_DMA_CR_TCIE |
|
| 409 |
+ STM32_DMA_CR_DIR_M2P;
|
| 410 |
+ i2cp->rxdmamode = STM32_DMA_CR_PSIZE_BYTE | STM32_DMA_CR_MSIZE_BYTE |
|
| 411 |
+ STM32_DMA_CR_MINC | STM32_DMA_CR_DMEIE |
|
| 412 |
+ STM32_DMA_CR_TEIE | STM32_DMA_CR_TCIE |
|
| 413 |
+ STM32_DMA_CR_DIR_P2M;
|
| 414 |
+#endif
|
| 415 |
+
|
| 416 |
rccResetI2C2(); |
| 417 |
|
| 418 |
+#if STM32_I2C_I2C2_USE_DMA
|
| 419 |
i2cp->dmarx = dmaStreamAllocI(STM32_I2C_I2C2_RX_DMA_STREAM, |
| 420 |
STM32_I2C_I2C2_IRQ_PRIORITY, |
| 421 |
(stm32_dmaisr_t)i2c_lld_serve_rx_end_irq, |
| 422 |
@@ -589,22 +828,50 @@ void i2c_lld_start(I2CDriver *i2cp) { |
| 423 |
(stm32_dmaisr_t)i2c_lld_serve_tx_end_irq, |
| 424 |
(void *)i2cp);
|
| 425 |
osalDbgAssert(i2cp->dmatx != NULL, "unable to allocate stream"); |
| 426 |
+#endif
|
| 427 |
|
| 428 |
rccEnableI2C2(true);
|
| 429 |
nvicEnableVector(I2C2_EV_IRQn, STM32_I2C_I2C2_IRQ_PRIORITY); |
| 430 |
nvicEnableVector(I2C2_ER_IRQn, STM32_I2C_I2C2_IRQ_PRIORITY); |
| 431 |
|
| 432 |
+#if STM32_I2C_I2C2_USE_DMA
|
| 433 |
i2cp->rxdmamode |= STM32_DMA_CR_CHSEL(I2C2_RX_DMA_CHANNEL) | |
| 434 |
STM32_DMA_CR_PL(STM32_I2C_I2C2_DMA_PRIORITY); |
| 435 |
i2cp->txdmamode |= STM32_DMA_CR_CHSEL(I2C2_TX_DMA_CHANNEL) | |
| 436 |
STM32_DMA_CR_PL(STM32_I2C_I2C2_DMA_PRIORITY); |
| 437 |
+
|
| 438 |
+ /* I2C registers pointed by the DMA.*/
|
| 439 |
+ dmaStreamSetPeripheral(i2cp->dmarx, &dp->DR);
|
| 440 |
+ dmaStreamSetPeripheral(i2cp->dmatx, &dp->DR);
|
| 441 |
+#endif
|
| 442 |
+
|
| 443 |
+ /* Reset i2c peripheral.*/
|
| 444 |
+ dp->CR1 = I2C_CR1_SWRST;
|
| 445 |
+ dp->CR1 = 0;
|
| 446 |
+#if STM32_I2C_I2C2_USE_DMA
|
| 447 |
+ dp->CR2 = I2C_CR2_ITERREN | I2C_CR2_DMAEN;
|
| 448 |
+#else
|
| 449 |
+ dp->CR2 = I2C_CR2_ITERREN;
|
| 450 |
+#endif
|
| 451 |
} |
| 452 |
#endif /* STM32_I2C_USE_I2C2 */ |
| 453 |
|
| 454 |
#if STM32_I2C_USE_I2C3
|
| 455 |
if (&I2CD3 == i2cp) {
|
| 456 |
+#if STM32_I2C_I2C3_USE_DMA
|
| 457 |
+ i2cp->txdmamode = STM32_DMA_CR_PSIZE_BYTE | STM32_DMA_CR_MSIZE_BYTE |
|
| 458 |
+ STM32_DMA_CR_MINC | STM32_DMA_CR_DMEIE |
|
| 459 |
+ STM32_DMA_CR_TEIE | STM32_DMA_CR_TCIE |
|
| 460 |
+ STM32_DMA_CR_DIR_M2P;
|
| 461 |
+ i2cp->rxdmamode = STM32_DMA_CR_PSIZE_BYTE | STM32_DMA_CR_MSIZE_BYTE |
|
| 462 |
+ STM32_DMA_CR_MINC | STM32_DMA_CR_DMEIE |
|
| 463 |
+ STM32_DMA_CR_TEIE | STM32_DMA_CR_TCIE |
|
| 464 |
+ STM32_DMA_CR_DIR_P2M;
|
| 465 |
+#endif
|
| 466 |
+
|
| 467 |
rccResetI2C3(); |
| 468 |
|
| 469 |
+#if STM32_I2C_I2C3_USE_DMA
|
| 470 |
i2cp->dmarx = dmaStreamAllocI(STM32_I2C_I2C3_RX_DMA_STREAM, |
| 471 |
STM32_I2C_I2C3_IRQ_PRIORITY, |
| 472 |
(stm32_dmaisr_t)i2c_lld_serve_rx_end_irq, |
| 473 |
@@ -615,28 +882,35 @@ void i2c_lld_start(I2CDriver *i2cp) { |
| 474 |
(stm32_dmaisr_t)i2c_lld_serve_tx_end_irq, |
| 475 |
(void *)i2cp);
|
| 476 |
osalDbgAssert(i2cp->dmatx != NULL, "unable to allocate stream"); |
| 477 |
+#endif
|
| 478 |
|
| 479 |
rccEnableI2C3(true);
|
| 480 |
nvicEnableVector(I2C3_EV_IRQn, STM32_I2C_I2C3_IRQ_PRIORITY); |
| 481 |
nvicEnableVector(I2C3_ER_IRQn, STM32_I2C_I2C3_IRQ_PRIORITY); |
| 482 |
|
| 483 |
+#if STM32_I2C_I2C3_USE_DMA
|
| 484 |
i2cp->rxdmamode |= STM32_DMA_CR_CHSEL(I2C3_RX_DMA_CHANNEL) | |
| 485 |
STM32_DMA_CR_PL(STM32_I2C_I2C3_DMA_PRIORITY); |
| 486 |
i2cp->txdmamode |= STM32_DMA_CR_CHSEL(I2C3_TX_DMA_CHANNEL) | |
| 487 |
STM32_DMA_CR_PL(STM32_I2C_I2C3_DMA_PRIORITY); |
| 488 |
+
|
| 489 |
+ /* I2C registers pointed by the DMA.*/
|
| 490 |
+ dmaStreamSetPeripheral(i2cp->dmarx, &dp->DR);
|
| 491 |
+ dmaStreamSetPeripheral(i2cp->dmatx, &dp->DR);
|
| 492 |
+#endif
|
| 493 |
+
|
| 494 |
+ /* Reset i2c peripheral.*/
|
| 495 |
+ dp->CR1 = I2C_CR1_SWRST;
|
| 496 |
+ dp->CR1 = 0;
|
| 497 |
+#if STM32_I2C_I2C3_USE_DMA
|
| 498 |
+ dp->CR2 = I2C_CR2_ITERREN | I2C_CR2_DMAEN;
|
| 499 |
+#else
|
| 500 |
+ dp->CR2 = I2C_CR2_ITERREN;
|
| 501 |
+#endif
|
| 502 |
} |
| 503 |
#endif /* STM32_I2C_USE_I2C3 */ |
| 504 |
} |
| 505 |
|
| 506 |
- /* I2C registers pointed by the DMA.*/
|
| 507 |
- dmaStreamSetPeripheral(i2cp->dmarx, &dp->DR);
|
| 508 |
- dmaStreamSetPeripheral(i2cp->dmatx, &dp->DR);
|
| 509 |
-
|
| 510 |
- /* Reset i2c peripheral.*/
|
| 511 |
- dp->CR1 = I2C_CR1_SWRST;
|
| 512 |
- dp->CR1 = 0;
|
| 513 |
- dp->CR2 = I2C_CR2_ITERREN | I2C_CR2_DMAEN;
|
| 514 |
-
|
| 515 |
/* Setup I2C parameters.*/
|
| 516 |
i2c_lld_set_clock(i2cp); |
| 517 |
i2c_lld_set_opmode(i2cp); |
| 518 |
@@ -659,13 +933,15 @@ void i2c_lld_stop(I2CDriver *i2cp) { |
| 519 |
|
| 520 |
/* I2C disable.*/
|
| 521 |
i2c_lld_abort_operation(i2cp); |
| 522 |
- dmaStreamFreeI(i2cp->dmatx);
|
| 523 |
- dmaStreamFreeI(i2cp->dmarx);
|
| 524 |
- i2cp->dmatx = NULL;
|
| 525 |
- i2cp->dmarx = NULL;
|
| 526 |
|
| 527 |
#if STM32_I2C_USE_I2C1
|
| 528 |
if (&I2CD1 == i2cp) {
|
| 529 |
+#if STM32_I2C_I2C1_USE_DMA
|
| 530 |
+ dmaStreamFreeI(i2cp->dmatx);
|
| 531 |
+ dmaStreamFreeI(i2cp->dmarx);
|
| 532 |
+ i2cp->dmatx = NULL;
|
| 533 |
+ i2cp->dmarx = NULL;
|
| 534 |
+#endif
|
| 535 |
nvicDisableVector(I2C1_EV_IRQn); |
| 536 |
nvicDisableVector(I2C1_ER_IRQn); |
| 537 |
rccDisableI2C1(); |
| 538 |
@@ -674,6 +950,12 @@ void i2c_lld_stop(I2CDriver *i2cp) { |
| 539 |
|
| 540 |
#if STM32_I2C_USE_I2C2
|
| 541 |
if (&I2CD2 == i2cp) {
|
| 542 |
+#if STM32_I2C_I2C2_USE_DMA
|
| 543 |
+ dmaStreamFreeI(i2cp->dmatx);
|
| 544 |
+ dmaStreamFreeI(i2cp->dmarx);
|
| 545 |
+ i2cp->dmatx = NULL;
|
| 546 |
+ i2cp->dmarx = NULL;
|
| 547 |
+#endif
|
| 548 |
nvicDisableVector(I2C2_EV_IRQn); |
| 549 |
nvicDisableVector(I2C2_ER_IRQn); |
| 550 |
rccDisableI2C2(); |
| 551 |
@@ -682,6 +964,12 @@ void i2c_lld_stop(I2CDriver *i2cp) { |
| 552 |
|
| 553 |
#if STM32_I2C_USE_I2C3
|
| 554 |
if (&I2CD3 == i2cp) {
|
| 555 |
+#if STM32_I2C_I2C3_USE_DMA
|
| 556 |
+ dmaStreamFreeI(i2cp->dmatx);
|
| 557 |
+ dmaStreamFreeI(i2cp->dmarx);
|
| 558 |
+ i2cp->dmatx = NULL;
|
| 559 |
+ i2cp->dmarx = NULL;
|
| 560 |
+#endif
|
| 561 |
nvicDisableVector(I2C3_EV_IRQn); |
| 562 |
nvicDisableVector(I2C3_ER_IRQn); |
| 563 |
rccDisableI2C3(); |
| 564 |
@@ -732,10 +1020,43 @@ msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
|
| 565 |
/* Releases the lock from high level driver.*/
|
| 566 |
osalSysUnlock(); |
| 567 |
|
| 568 |
- /* RX DMA setup.*/
|
| 569 |
- dmaStreamSetMode(i2cp->dmarx, i2cp->rxdmamode);
|
| 570 |
- dmaStreamSetMemory0(i2cp->dmarx, rxbuf);
|
| 571 |
- dmaStreamSetTransactionSize(i2cp->dmarx, rxbytes);
|
| 572 |
+ /* RX (DMA) setup.*/
|
| 573 |
+#if STM32_I2C_USE_I2C1
|
| 574 |
+ if (&I2CD1 == i2cp) {
|
| 575 |
+#if STM32_I2C_I2C1_USE_DMA
|
| 576 |
+ dmaStreamSetMode(i2cp->dmarx, i2cp->rxdmamode);
|
| 577 |
+ dmaStreamSetMemory0(i2cp->dmarx, rxbuf);
|
| 578 |
+ dmaStreamSetTransactionSize(i2cp->dmarx, rxbytes);
|
| 579 |
+#else
|
| 580 |
+ i2cp->rxbuf = rxbuf;
|
| 581 |
+ i2cp->rxbytes = rxbytes;
|
| 582 |
+#endif
|
| 583 |
+ }
|
| 584 |
+#endif
|
| 585 |
+#if STM32_I2C_USE_I2C2
|
| 586 |
+ if (&I2CD2 == i2cp) {
|
| 587 |
+#if STM32_I2C_I2C2_USE_DMA
|
| 588 |
+ dmaStreamSetMode(i2cp->dmarx, i2cp->rxdmamode);
|
| 589 |
+ dmaStreamSetMemory0(i2cp->dmarx, rxbuf);
|
| 590 |
+ dmaStreamSetTransactionSize(i2cp->dmarx, rxbytes);
|
| 591 |
+#else
|
| 592 |
+ i2cp->rxbuf = rxbuf;
|
| 593 |
+ i2cp->rxbytes = rxbytes;
|
| 594 |
+#endif
|
| 595 |
+ }
|
| 596 |
+#endif
|
| 597 |
+#if STM32_I2C_USE_I2C3
|
| 598 |
+ if (&I2CD3 == i2cp) {
|
| 599 |
+#if STM32_I2C_I2C3_USE_DMA
|
| 600 |
+ dmaStreamSetMode(i2cp->dmarx, i2cp->rxdmamode);
|
| 601 |
+ dmaStreamSetMemory0(i2cp->dmarx, rxbuf);
|
| 602 |
+ dmaStreamSetTransactionSize(i2cp->dmarx, rxbytes);
|
| 603 |
+#else
|
| 604 |
+ i2cp->rxbuf = rxbuf;
|
| 605 |
+ i2cp->rxbytes = rxbytes;
|
| 606 |
+#endif
|
| 607 |
+ }
|
| 608 |
+#endif
|
| 609 |
|
| 610 |
/* Calculating the time window for the timeout on the busy bus condition.*/
|
| 611 |
start = osalOsGetSystemTimeX(); |
| 612 |
@@ -812,15 +1133,61 @@ msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,
|
| 613 |
/* Releases the lock from high level driver.*/
|
| 614 |
osalSysUnlock(); |
| 615 |
|
| 616 |
- /* TX DMA setup.*/
|
| 617 |
- dmaStreamSetMode(i2cp->dmatx, i2cp->txdmamode);
|
| 618 |
- dmaStreamSetMemory0(i2cp->dmatx, txbuf);
|
| 619 |
- dmaStreamSetTransactionSize(i2cp->dmatx, txbytes);
|
| 620 |
-
|
| 621 |
- /* RX DMA setup.*/
|
| 622 |
- dmaStreamSetMode(i2cp->dmarx, i2cp->rxdmamode);
|
| 623 |
- dmaStreamSetMemory0(i2cp->dmarx, rxbuf);
|
| 624 |
- dmaStreamSetTransactionSize(i2cp->dmarx, rxbytes);
|
| 625 |
+ /* TX (DMA) and RX (DMA) setup.*/
|
| 626 |
+#if STM32_I2C_USE_I2C1
|
| 627 |
+ if (&I2CD1 == i2cp) {
|
| 628 |
+#if STM32_I2C_I2C1_USE_DMA
|
| 629 |
+ dmaStreamSetMode(i2cp->dmatx, i2cp->txdmamode);
|
| 630 |
+ dmaStreamSetMemory0(i2cp->dmatx, txbuf);
|
| 631 |
+ dmaStreamSetTransactionSize(i2cp->dmatx, txbytes);
|
| 632 |
+
|
| 633 |
+ dmaStreamSetMode(i2cp->dmarx, i2cp->rxdmamode);
|
| 634 |
+ dmaStreamSetMemory0(i2cp->dmarx, rxbuf);
|
| 635 |
+ dmaStreamSetTransactionSize(i2cp->dmarx, rxbytes);
|
| 636 |
+#else
|
| 637 |
+ i2cp->txbuf = txbuf;
|
| 638 |
+ i2cp->txbytes = txbytes;
|
| 639 |
+ i2cp->rxbuf = rxbuf;
|
| 640 |
+ i2cp->rxbytes = rxbytes;
|
| 641 |
+#endif
|
| 642 |
+ }
|
| 643 |
+#endif
|
| 644 |
+#if STM32_I2C_USE_I2C2
|
| 645 |
+ if (&I2CD2 == i2cp) {
|
| 646 |
+#if STM32_I2C_I2C2_USE_DMA
|
| 647 |
+ dmaStreamSetMode(i2cp->dmatx, i2cp->txdmamode);
|
| 648 |
+ dmaStreamSetMemory0(i2cp->dmatx, txbuf);
|
| 649 |
+ dmaStreamSetTransactionSize(i2cp->dmatx, txbytes);
|
| 650 |
+
|
| 651 |
+ dmaStreamSetMode(i2cp->dmarx, i2cp->rxdmamode);
|
| 652 |
+ dmaStreamSetMemory0(i2cp->dmarx, rxbuf);
|
| 653 |
+ dmaStreamSetTransactionSize(i2cp->dmarx, rxbytes);
|
| 654 |
+#else
|
| 655 |
+ i2cp->txbuf = txbuf;
|
| 656 |
+ i2cp->txbytes = txbytes;
|
| 657 |
+ i2cp->rxbuf = rxbuf;
|
| 658 |
+ i2cp->rxbytes = rxbytes;
|
| 659 |
+#endif
|
| 660 |
+ }
|
| 661 |
+#endif
|
| 662 |
+#if STM32_I2C_USE_I2C3
|
| 663 |
+ if (&I2CD3 == i2cp) {
|
| 664 |
+#if STM32_I2C_I2C3_USE_DMA
|
| 665 |
+ dmaStreamSetMode(i2cp->dmatx, i2cp->txdmamode);
|
| 666 |
+ dmaStreamSetMemory0(i2cp->dmatx, txbuf);
|
| 667 |
+ dmaStreamSetTransactionSize(i2cp->dmatx, txbytes);
|
| 668 |
+
|
| 669 |
+ dmaStreamSetMode(i2cp->dmarx, i2cp->rxdmamode);
|
| 670 |
+ dmaStreamSetMemory0(i2cp->dmarx, rxbuf);
|
| 671 |
+ dmaStreamSetTransactionSize(i2cp->dmarx, rxbytes);
|
| 672 |
+#else
|
| 673 |
+ i2cp->txbuf = txbuf;
|
| 674 |
+ i2cp->txbytes = txbytes;
|
| 675 |
+ i2cp->rxbuf = rxbuf;
|
| 676 |
+ i2cp->rxbytes = rxbytes;
|
| 677 |
+#endif
|
| 678 |
+ }
|
| 679 |
+#endif
|
| 680 |
|
| 681 |
/* Calculating the time window for the timeout on the busy bus condition.*/
|
| 682 |
start = osalOsGetSystemTimeX(); |
| 683 |
diff --git a/os/hal/ports/STM32/LLD/I2Cv1/hal_i2c_lld.h b/os/hal/ports/STM32/LLD/I2Cv1/hal_i2c_lld.h
|
| 684 |
--- a/os/hal/ports/STM32/LLD/I2Cv1/hal_i2c_lld.h
|
| 685 |
+++ b/os/hal/ports/STM32/LLD/I2Cv1/hal_i2c_lld.h
|
| 686 |
@@ -103,6 +103,33 @@
|
| 687 |
#define STM32_I2C_I2C3_IRQ_PRIORITY 10 |
| 688 |
#endif
|
| 689 |
|
| 690 |
+/**
|
| 691 |
+ * @brief I2C1 DMA enable switch.
|
| 692 |
+ * @details If set to @p TRUE the I2C1 driver will use DMA.
|
| 693 |
+ * @note The default is @p TRUE.
|
| 694 |
+ */
|
| 695 |
+#if !defined(STM32_I2C_I2C1_USE_DMA) || defined(__DOXYGEN__)
|
| 696 |
+#define STM32_I2C_I2C1_USE_DMA TRUE
|
| 697 |
+#endif
|
| 698 |
+
|
| 699 |
+/**
|
| 700 |
+ * @brief I2C2 DMA enable switch.
|
| 701 |
+ * @details If set to @p TRUE the I2C2 driver will use DMA.
|
| 702 |
+ * @note The default is @p TRUE.
|
| 703 |
+ */
|
| 704 |
+#if !defined(STM32_I2C_I2C2_USE_DMA) || defined(__DOXYGEN__)
|
| 705 |
+#define STM32_I2C_I2C2_USE_DMA TRUE
|
| 706 |
+#endif
|
| 707 |
+
|
| 708 |
+/**
|
| 709 |
+ * @brief I2C3 DMA enable switch.
|
| 710 |
+ * @details If set to @p TRUE the I2C3 driver will use DMA.
|
| 711 |
+ * @note The default is @p TRUE.
|
| 712 |
+ */
|
| 713 |
+#if !defined(STM32_I2C_I2C3_USE_DMA) || defined(__DOXYGEN__)
|
| 714 |
+#define STM32_I2C_I2C3_USE_DMA TRUE
|
| 715 |
+#endif
|
| 716 |
+
|
| 717 |
/**
|
| 718 |
* @brief I2C1 DMA priority (0..3|lowest..highest). |
| 719 |
* @note The priority level is used for both the TX and RX DMA streams but |
| 720 |
@@ -250,16 +277,19 @@
|
| 721 |
#endif
|
| 722 |
|
| 723 |
#if STM32_I2C_USE_I2C1 && \ |
| 724 |
+ STM32_I2C_I2C1_USE_DMA && \
|
| 725 |
!STM32_DMA_IS_VALID_PRIORITY(STM32_I2C_I2C1_DMA_PRIORITY) |
| 726 |
#error "Invalid DMA priority assigned to I2C1" |
| 727 |
#endif
|
| 728 |
|
| 729 |
#if STM32_I2C_USE_I2C2 && \ |
| 730 |
+ STM32_I2C_I2C2_USE_DMA && \
|
| 731 |
!STM32_DMA_IS_VALID_PRIORITY(STM32_I2C_I2C2_DMA_PRIORITY) |
| 732 |
#error "Invalid DMA priority assigned to I2C2" |
| 733 |
#endif
|
| 734 |
|
| 735 |
#if STM32_I2C_USE_I2C3 && \ |
| 736 |
+ STM32_I2C_I2C3_USE_DMA && \
|
| 737 |
!STM32_DMA_IS_VALID_PRIORITY(STM32_I2C_I2C3_DMA_PRIORITY) |
| 738 |
#error "Invalid DMA priority assigned to I2C3" |
| 739 |
#endif
|
| 740 |
@@ -316,7 +346,10 @@
|
| 741 |
#endif
|
| 742 |
#endif /* STM32_ADVANCED_DMA */ |
| 743 |
|
| 744 |
-#if !defined(STM32_DMA_REQUIRED)
|
| 745 |
+#if ((STM32_I2C_USE_I2C1 && STM32_I2C_I2C1_USE_DMA) || \
|
| 746 |
+ (STM32_I2C_USE_I2C2 && STM32_I2C_I2C2_USE_DMA) || \
|
| 747 |
+ (STM32_I2C_USE_I2C3 && STM32_I2C_I2C3_USE_DMA)) && \
|
| 748 |
+ !defined(STM32_DMA_REQUIRED)
|
| 749 |
#define STM32_DMA_REQUIRED
|
| 750 |
#endif
|
| 751 |
|
| 752 |
@@ -437,21 +470,52 @@ struct I2CDriver { |
| 753 |
*/ |
| 754 |
i2caddr_t addr; |
| 755 |
/**
|
| 756 |
- * @brief RX DMA mode bit mask.
|
| 757 |
- */
|
| 758 |
- uint32_t rxdmamode;
|
| 759 |
- /**
|
| 760 |
- * @brief TX DMA mode bit mask.
|
| 761 |
- */
|
| 762 |
- uint32_t txdmamode;
|
| 763 |
- /**
|
| 764 |
- * @brief Receive DMA channel.
|
| 765 |
- */
|
| 766 |
- const stm32_dma_stream_t *dmarx;
|
| 767 |
- /**
|
| 768 |
- * @brief Transmit DMA channel.
|
| 769 |
+ * @brief Anonymous union to store transmission related data for either DMA or non-DMA mode.
|
| 770 |
*/ |
| 771 |
- const stm32_dma_stream_t *dmatx;
|
| 772 |
+ union {
|
| 773 |
+ /**
|
| 774 |
+ * @brief Anonymous struct to store data for DMA mode.
|
| 775 |
+ */
|
| 776 |
+ struct {
|
| 777 |
+ /**
|
| 778 |
+ * @brief RX DMA mode bit mask.
|
| 779 |
+ */
|
| 780 |
+ uint32_t rxdmamode;
|
| 781 |
+ /**
|
| 782 |
+ * @brief TX DMA mode bit mask.
|
| 783 |
+ */
|
| 784 |
+ uint32_t txdmamode;
|
| 785 |
+ /**
|
| 786 |
+ * @brief Receive DMA channel.
|
| 787 |
+ */
|
| 788 |
+ const stm32_dma_stream_t *dmarx;
|
| 789 |
+ /**
|
| 790 |
+ * @brief Transmit DMA channel.
|
| 791 |
+ */
|
| 792 |
+ const stm32_dma_stream_t *dmatx;
|
| 793 |
+ };
|
| 794 |
+ /**
|
| 795 |
+ * @brief Anonymous struct to store data for non-DMA mode.
|
| 796 |
+ */
|
| 797 |
+ struct {
|
| 798 |
+ /**
|
| 799 |
+ * @brief Receive buffer.
|
| 800 |
+ */
|
| 801 |
+ uint8_t *rxbuf;
|
| 802 |
+ /**
|
| 803 |
+ * @brief Size of the receive buffer.
|
| 804 |
+ */
|
| 805 |
+ size_t rxbytes;
|
| 806 |
+ /**
|
| 807 |
+ * @brief Transmit buffer.
|
| 808 |
+ */
|
| 809 |
+ const uint8_t *txbuf;
|
| 810 |
+ /**
|
| 811 |
+ * @brief Size of the transmit buffer.
|
| 812 |
+ */
|
| 813 |
+ size_t txbytes;
|
| 814 |
+ };
|
| 815 |
+ };
|
| 816 |
/**
|
| 817 |
* @brief Pointer to the I2Cx registers block.
|
| 818 |
*/ |