chore: debloat (remove platformio), onewire improvements

Squashed commit of the following: commit 5f16309f629b9928d2134b85ae64af69bc3ebbcd Author: kuwoyuki <kuwoyuki@cock.li> Date: Sun Nov 24 22:55:15 2024 +0600 fix: Makefile, improve onewire retries commit 55496a3bda941b52ff349dc75c9c06eb5a37c07d Author: kuwoyuki <kuwoyuki@cock.li> Date: Mon Nov 18 00:41:18 2024 +0600 fix: make onewire validity less strict commit 3428a9bc9792508972ce3e7e4e35a64f047bca10 Author: kuwoyuki <kuwoyuki@cock.li> Date: Sun Nov 17 23:57:55 2024 +0600 chore: rm bins commit 1594e5ed430522b15466c8afa62ff7fb1b28947c Author: kuwoyuki <kuwoyuki@cock.li> Date: Sun Nov 17 23:32:01 2024 +0600 chore: unplatformiofy
2024-11-24 22:56:05 +06:00
parent 2a7aa8aea3
commit 8adc726b0b
74 changed files with 141 additions and 195 deletions
--- a/uart.c
+++ b/uart.c
@@ -0,0 +1,94 @@
+#include "uart.h"
+
+#include "ch32v003fun.h"
+
+#define RS485_TX_EN (1 << 14)  // PB14
+#define RS485_RX_EN (1 << 15)  // PB15
+
+// Write multiple chars to UART
+int _write(__attribute__((unused)) int fd, const char *buf, int size) {
+  for (int i = 0; i < size; i++) {
+    while (!(USART2->STATR & USART_FLAG_TC));  // Wait for transmission complete
+    USART2->DATAR = *buf++;                    // Send character
+  }
+  return size;
+}
+
+// Write a single char to UART
+int putchar(int c) {
+  while (!(USART2->STATR & USART_FLAG_TC));  // Wait for transmission complete
+  USART2->DATAR = (uint8_t)c;                // Send character
+  return (unsigned char)c;
+}
+
+void uart2_init(int uart_brr) {
+  RCC->APB2PCENR |= RCC_APB2Periph_GPIOA;   // Enable GPIOA on APB2
+  RCC->APB1PCENR |= RCC_APB1Periph_USART2;  // Enable USART2 on APB1
+
+  GPIOA->CFGLR &= ~(0xf << (4 * 2));  // Clear bits for PA2
+  GPIOA->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP_AF)
+                  << (4 * 2);  // Set PA2 as AF
+
+  // USART configuration: 115200 baud rate, 8 data bits, no parity, 1 stop bit
+  USART2->CTLR1 = USART_WordLength_8b | USART_Parity_No | USART_Mode_Tx;
+  USART2->CTLR2 = USART_StopBits_1;
+  USART2->CTLR3 = USART_HardwareFlowControl_None;
+
+  USART2->BRR = uart_brr;
+  // Enable USART2
+  USART2->CTLR1 |= CTLR1_UE_Set;
+}
+
+void rs485_init(int uart_brr) {
+  RCC->APB2PCENR |= RCC_APB2Periph_GPIOA |  // Enable GPIOA
+                    RCC_APB2Periph_GPIOB |  // Enable GPIOB
+                    RCC_APB2Periph_USART1;  // Enable USART1
+
+  // configure uart1 pins (PA9=TX, PA10=RX)
+  GPIOA->CFGHR &=
+      ~(0xf << (4 * 1) | 0xf << (4 * 2));  // Clear PA9 & PA10 config
+  GPIOA->CFGHR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP_AF)
+                  << (4 * 1);                       // PA9 (TX)
+  GPIOA->CFGHR |= GPIO_CNF_IN_FLOATING << (4 * 2);  // PA10 (RX)
+
+  // configure rs485 direction control pins (PB14=TX_EN, PB15=RX_EN)
+  GPIOB->CFGHR &=
+      ~(0xf << (4 * 6) | 0xf << (4 * 7));  // Clear PB14 & PB15 config
+  GPIOB->CFGHR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)
+                  << (4 * 6);  // PB14 (TX_EN)
+  GPIOB->CFGHR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)
+                  << (4 * 7);  // PB15 (RX_EN)
+
+  // initial state: rx mode
+  GPIOB->BCR = RS485_TX_EN;   // TX_EN low
+  GPIOB->BSHR = RS485_RX_EN;  // RX_EN high
+
+  // uart1 configuration
+  USART1->CTLR1 =
+      USART_WordLength_8b | USART_Parity_No | USART_Mode_Tx | USART_Mode_Rx;
+  USART1->CTLR2 = USART_StopBits_1;
+  USART1->CTLR3 = USART_HardwareFlowControl_None;
+  USART1->BRR = uart_brr;
+  USART1->CTLR1 |= CTLR1_UE_Set;
+}
+
+void rs485_send(uint8_t *buf, uint16_t len) {
+  // enable tx mode
+  GPIOB->BSHR = RS485_TX_EN;  // TX_EN high
+  GPIOB->BSHR = RS485_RX_EN;  // RX_EN low
+
+  for (uint16_t i = 0; i < len; i++) {
+    while (!(USART1->STATR & USART_FLAG_TXE));
+    USART1->DATAR = buf[i];
+  }
+
+  while (!(USART1->STATR & USART_FLAG_TC));
+
+  // switch back to rx mode
+  GPIOB->BCR = RS485_TX_EN;  // TX_EN low
+  GPIOB->BCR = RS485_RX_EN;  // RX_EN high
+}
+
+uint8_t rs485_available(void) { return (USART1->STATR & USART_FLAG_RXNE) != 0; }
+
+uint8_t rs485_read(void) { return USART1->DATAR & 0xFF; }