<div dir="ltr"><div><div>No nech to je logicke ako chce, ja ten kod na svojom netbooku vidim na troch obrazovkach... Nieco podobne ako doobeda prepinanie hodin.<br><br></div>Nezda sa Vam to trochu uletene?!<br><br></div>A.<br></div><div class="gmail_extra"><br><div class="gmail_quote">2014-11-05 20:22 GMT+01:00 Jaroslav Buchta <span dir="ltr"><<a href="mailto:jaroslav.buchta@hascomp.cz" target="_blank">jaroslav.buchta@hascomp.cz</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Mozna, no, ale kdyz pouziju tu funkci, nemusim to resit ;-)<br>
Me prece jen napr. takovyto zapis prijde dost prehledny a elegantni, po prekladu a optimalizaci to neni ani nejak neefektivni.><br>
<br>
RCC_AHBPeriphClockCmd(RCC_<u></u>AHBPeriph_DMA1, ENABLE);<br>
<br>
DMA_InitTypeDef DMA_InitStructure;<br>
<br>
DMA_StructInit(&DMA_<u></u>InitStructure);<br>
/* USART1_Rx_DMA_Channel (triggered by USART1 Rx event) Config */<br>
DMA_DeInit(DMA1_Channel5);<br>
DMA_InitStructure.DMA_<u></u>PeripheralBaseAddr = (uint32_t)&(USART1->DR); //USART1 DR<br>
DMA_InitStructure.DMA_<u></u>MemoryBaseAddr = (uint32_t)mstRcvBuf;<br>
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;<br>
DMA_InitStructure.DMA_<u></u>BufferSize = MSTRCVBUFLEN;<br>
DMA_InitStructure.DMA_<u></u>PeripheralInc = DMA_PeripheralInc_Disable;<br>
DMA_InitStructure.DMA_<u></u>MemoryInc = DMA_MemoryInc_Enable;<br>
DMA_InitStructure.DMA_<u></u>PeripheralDataSize = DMA_PeripheralDataSize_Byte;<br>
DMA_InitStructure.DMA_<u></u>MemoryDataSize = DMA_MemoryDataSize_Byte;<br>
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;<br>
DMA_InitStructure.DMA_Priority = DMA_Priority_High;<br>
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;<br>
DMA_Init(DMA1_Channel5, &DMA_InitStructure);<br>
<br>
<br>
DMA_StructInit(&DMA_<u></u>InitStructure);<br>
/* USART1_Tx_DMA_Channel (triggered by USART1 Tx event) Config */<br>
DMA_DeInit(DMA1_Channel4);<br>
DMA_InitStructure.DMA_<u></u>PeripheralBaseAddr = (uint32_t)&(USART1->DR); //USART1 DR<br>
DMA_InitStructure.DMA_<u></u>MemoryBaseAddr = (uint32_t)bufTxMaster;<br>
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;<br>
DMA_InitStructure.DMA_<u></u>BufferSize = 1;<br>
DMA_InitStructure.DMA_<u></u>PeripheralInc = DMA_PeripheralInc_Disable;<br>
DMA_InitStructure.DMA_<u></u>MemoryInc = DMA_MemoryInc_Enable;<br>
DMA_InitStructure.DMA_<u></u>PeripheralDataSize = DMA_PeripheralDataSize_Byte;<br>
DMA_InitStructure.DMA_<u></u>MemoryDataSize = DMA_MemoryDataSize_Byte;<br>
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;<br>
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;<br>
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;<br>
DMA_Init(DMA1_Channel4, &DMA_InitStructure);<br>
<br>
<br>
NVIC_InitStructure.NVIC_<u></u>IRQChannel = DMA1_Channel5_IRQn;<br>
NVIC_InitStructure.NVIC_<u></u>IRQChannelPreemptionPriority = 14;<br>
NVIC_InitStructure.NVIC_<u></u>IRQChannelSubPriority = 0;<br>
NVIC_InitStructure.NVIC_<u></u>IRQChannelCmd = ENABLE;<br>
NVIC_Init(&NVIC_InitStructure)<u></u>;<br>
<br>
DMA_ITConfig(DMA1_Channel5, DMA_IT_HT| DMA_IT_TC, ENABLE);<br>
<br>
/* Enable USART1 DMA RX request */<br>
USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);<br>
/* Enable USART1 DMA TX request */<br>
USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);<br>
<br>
DMA_Cmd(DMA1_Channel5, ENABLE);<br>
<br>
<br>
<br>
<br>
Dne 5. 11. 2014 19:53, Jan Waclawek napsal(a):<div class="HOEnZb"><div class="h5"><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Treba inicializace DMA je podstatne jednodussi naplnenim cca 15 polozek<br>
struktury dle nejakeho vzoroveho prikladu a pouzitim funkce ...Init, nez<br>
hledanim jake registry jak nastavit a v jakem poradi...<br>
</blockquote>
Zhodou okolnosti su to len 4 registre - zdojova adresa, cielova adresa,<br>
pocet prenasanych poloziek a riadiaci register (plus treba vynulovat<br>
status bity, t.j. spolu s tym je to 5) a v lubovolnom poradi, kym sa to<br>
DMA nepovoli (tj najjednoduchsie je zapisovat do kontrolneho nakoniec,<br>
inak je to jedno).<br>
<br>
S pozitim symbolov z stm32xxxx.h je to aj prehladne (akurat si treba<br>
dopisat definicie poloziek pre bitove polia, KTORE BY SOM AJ NA TOMTO<br>
MIESTE RAD POPROSIL OD PRITOMNYCH Z ST, ABY ICH DOPLNILI), napr.<br>
<a href="http://www.efton.sk/STM32/bt.c" target="_blank">www.efton.sk/STM32/bt.c</a> spolu s <a href="http://www.efton.sk/STM32/stm32f4xx.h.zip" target="_blank">www.efton.sk/STM32/stm32f4xx.<u></u>h.zip</a><br>
<br>
wek<br>
<br>
<br>
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