{"id":3225,"date":"2012-06-18T02:08:25","date_gmt":"2012-06-18T06:08:25","guid":{"rendered":"https:\/\/example.com\/?postname=configure-usart-2-on-stm32f4"},"modified":"2012-06-18T02:08:25","modified_gmt":"2012-06-18T06:08:25","slug":"configure-usart-2-on-stm32f4","status":"publish","type":"post","link":"http:\/\/atomsofttech.com\/blog\/uncategorized\/configure-usart-2-on-stm32f4\/","title":{"rendered":"Configure USART 2 on STM32F4"},"content":{"rendered":"

I wrote a nice simple piece of code that will configure USART2 on PD5(tx) and PD6(rx). Works like a charm \"Smile\" For me so far at least. APBClock is 1\/8 my clock\u2026 if this doesn\u2019t work its usually a incorrect clock setting.<\/p>\n

\n
#define<\/span> myClock 168000000
#define<\/span> myBaud 115200

void<\/span> ConfigUSART2(uint32_t BAUD, uint32_t fosc)
{
  uint32_t tmpreg = 0x00, apbclock = 0x00;
  uint32_t integerdivider = 0x00;
  uint32_t fractionaldivider = 0x00;

  apbclock = fosc\/8;

  RCC->APB1ENR = (1 << 17);    \/\/Enable USART2 Clock<\/span>

  GPIOD->MODER |= (2 << 10); \/\/Setup TX pin for Alternate Function<\/span>
  GPIOD->MODER |= (2 << 12);  \/\/Setup RX pin for Alternate Function<\/span>

  GPIOD->AFR[0] |= (7 << 20); \/\/Setup TX as the Alternate Function<\/span>
  GPIOD->AFR[0] |= (7 << 24); \/\/Setup RX as the Alternate Function<\/span>

  USART2->CR1 |= (1 << 13);  \/\/Enable USART<\/span>

  integerdivider = ((25 * apbclock) \/ (2 * (BAUD)));  
  tmpreg = (integerdivider \/ 100) << 4;
  fractionaldivider = integerdivider - (100 * (tmpreg >> 4));

  tmpreg |= ((((fractionaldivider * 8) + 50) \/ 100)) & ((uint8_t)0x07);

  USART2->BRR = (uint16_t)tmpreg;
  USART2->CR1 |= (3 << 2);  \/\/Enable Tx & Rx<\/span>
}<\/pre>\n
<\/div>\n","protected":false},"excerpt":{"rendered":"
I wrote a nice simple piece of code that will configure USART2 on PD5(tx) and PD6(rx). Works like a charm For me so far at least. APBClock is 1\/8 my clock\u2026 if this doesn\u2019t work its usually a incorrect clock setting. #define myClock 168000000#define myBaud 115200void ConfigUSART2(uint32_t BAUD, uint32_t fosc){ uint32_t tmpreg = 0x00, apbclock […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-3225","post","type-post","status-publish","format-standard","hentry"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/atomsofttech.com\/blog\/wp-json\/wp\/v2\/posts\/3225","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/atomsofttech.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/atomsofttech.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/atomsofttech.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/atomsofttech.com\/blog\/wp-json\/wp\/v2\/comments?post=3225"}],"version-history":[{"count":0,"href":"http:\/\/atomsofttech.com\/blog\/wp-json\/wp\/v2\/posts\/3225\/revisions"}],"wp:attachment":[{"href":"http:\/\/atomsofttech.com\/blog\/wp-json\/wp\/v2\/media?parent=3225"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/atomsofttech.com\/blog\/wp-json\/wp\/v2\/categories?post=3225"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/atomsofttech.com\/blog\/wp-json\/wp\/v2\/tags?post=3225"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}