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-rw-r--r--apps/i2c1/CMakeLists.txt29
-rw-r--r--apps/i2c1/i2c1.cpp355
2 files changed, 384 insertions, 0 deletions
diff --git a/apps/i2c1/CMakeLists.txt b/apps/i2c1/CMakeLists.txt
new file mode 100644
index 0000000..67139f8
--- /dev/null
+++ b/apps/i2c1/CMakeLists.txt
@@ -0,0 +1,29 @@
+add_executable(i2c1.elf i2c1.cpp
+ ${PLAYGROUND_DIR}/src/init_low.s ${PLAYGROUND_DIR}/src/init_high.cpp ${PLAYGROUND_DIR}/include/init_high.h
+ ${PLAYGROUND_DIR}/include/playground.h
+ ${PLAYGROUND_DIR}/src/debug.cpp ${PLAYGROUND_DIR}/include/debug.h
+ ${PLAYGROUND_DIR}/include/stm32f10x_conf.h
+ # http://www.sparetimelabs.com/tinyprintf/tinyprintf.php
+ ${TINYPRINTF_DIR}/tinyprintf.c ${TINYPRINTF_DIR}/tinyprintf.h
+ ${STM32F10X_STDPERIPH_LIB}/Libraries/CMSIS/CM3/CoreSupport/core_cm3.c
+ ${STM32F10X_STDPERIPH_LIB}/Libraries/CMSIS/CM3/DeviceSupport/ST/STM32F10x/system_stm32f10x.c
+ ${STM32F10X_STDPERIPH_LIB}/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_rcc.c
+ ${STM32F10X_STDPERIPH_LIB}/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_gpio.c
+ ${STM32F10X_STDPERIPH_LIB}/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_i2c.c
+ )
+
+target_include_directories(i2c1.elf PUBLIC
+ ${PLAYGROUND_DIR}/include
+ ${TINYPRINTF_DIR}
+ ${STM32F10X_STDPERIPH_LIB}/Libraries/CMSIS/CM3/CoreSupport
+ ${STM32F10X_STDPERIPH_LIB}/Libraries/CMSIS/CM3/DeviceSupport/ST/STM32F10x
+ ${STM32F10X_STDPERIPH_LIB}/Libraries/STM32F10x_StdPeriph_Driver/inc)
+target_compile_definitions(i2c1.elf PUBLIC ${STM32F10X_STDPERIPH_DEFINES} USE_FULL_ASSERT)
+
+set_target_properties(i2c1.elf PROPERTIES O_LEVEL 3)
+
+#set_source_files_properties(i2c1.cpp PROPERTIES O_LEVEL s)
+set_property(SOURCE i2c1.cpp APPEND_STRING PROPERTY COMPILE_FLAGS "-O0")
+
+set_target_properties(i2c1.elf PROPERTIES LINK_FLAGS "-nostartfiles -T${CMAKE_SOURCE_DIR}/cmake/stm32.ld")
+add_extra_commands(i2c1.elf)
diff --git a/apps/i2c1/i2c1.cpp b/apps/i2c1/i2c1.cpp
new file mode 100644
index 0000000..b6d0a27
--- /dev/null
+++ b/apps/i2c1/i2c1.cpp
@@ -0,0 +1,355 @@
+#include <cstdint>
+#include <cstring>
+#include <stm32f10x_conf.h>
+#include <stm32f10x.h>
+#include <stm32f10x_rcc.h>
+#include <stm32f10x_gpio.h>
+#include <stm32f10x_i2c.h>
+#include <inttypes.h>
+#include <playground.h>
+#include "debug.h"
+#include "tinyprintf.h"
+
+extern "C" void halt();
+
+extern "C"
+__attribute__((naked))
+void HardFault_Handler_C(uint32_t *hardfault_args) {
+ dbg_printf("r0 = 0x%08lx (%lu)\n", hardfault_args[0], hardfault_args[0]);
+ dbg_printf("r1 = 0x%08lx (%lu)\n", hardfault_args[1], hardfault_args[1]);
+ dbg_printf("r2 = 0x%08lx (%lu)\n", hardfault_args[2], hardfault_args[2]);
+ dbg_printf("r3 = 0x%08lx (%lu)\n", hardfault_args[3], hardfault_args[3]);
+ dbg_printf("r12 = 0x%08lx (%lu)\n", hardfault_args[4], hardfault_args[4]);
+ dbg_printf("lr = 0x%08lx (%lu)\n", hardfault_args[5], hardfault_args[5]);
+ dbg_printf("pc = 0x%08lx (%lu)\n", hardfault_args[6], hardfault_args[6]);
+ dbg_printf("psr = 0x%08lx (%lu)\n", hardfault_args[7], hardfault_args[7]);
+ dbg_printf("\n");
+
+ halt();
+}
+
+size_t strlen(const char *s) {
+ size_t size = 0;
+ while (*s++ != '\0') size++;
+ return size;
+}
+
+bool run = true;
+
+volatile USART_TypeDef *usart1 = (volatile USART_TypeDef *) USART1_BASE;
+volatile I2C_TypeDef *i2c1 = (volatile I2C_TypeDef *) I2C1_BASE;
+volatile I2C_TypeDef *i2c2 = (volatile I2C_TypeDef *) I2C2_BASE;
+
+extern "C"
+void assert_failed(uint8_t *file, uint32_t line) {
+ dbg_printf("assert_failed: %s: %" PRIu32 "\n", file, line);
+}
+
+int start_wait_count;
+
+void i2c_hard_reset(I2C_TypeDef *I2Cx, I2C_InitTypeDef &i2c_init) {
+ dbg_printf("start_wait_count=%d\n", start_wait_count);
+ I2C_DeInit(I2Cx);
+ I2C_Cmd(I2Cx, DISABLE);
+ I2C_Init(I2Cx, &i2c_init);
+
+ GPIO_InitTypeDef init;
+ GPIO_StructInit(&init);
+ init.GPIO_Pin = GPIO_Pin_10;
+ init.GPIO_Mode = GPIO_Mode_Out_PP;
+ GPIO_Init(GPIOB, &init);
+
+ GPIO_WriteBit(GPIOB, GPIO_Pin_10, Bit_RESET);
+ for (int i = 0; i < 8; i++) {
+ GPIO_WriteBit(GPIOB, GPIO_Pin_10, Bit_SET);
+ GPIO_WriteBit(GPIOB, GPIO_Pin_10, Bit_RESET);
+ }
+
+ init.GPIO_Pin = GPIO_Pin_10;
+ init.GPIO_Mode = GPIO_Mode_AF_OD;
+ GPIO_Init(GPIOB, &init);
+
+ I2C_Cmd(I2Cx, ENABLE);
+
+ I2C_SoftwareResetCmd(I2Cx, ENABLE);
+ for (int i = 0; i < 100; i++) {
+ __NOP();
+ }
+ I2C_SoftwareResetCmd(I2Cx, DISABLE);
+}
+
+static inline bool i2c_wait_for_flag(I2C_TypeDef *I2Cx, uint32_t flag, FlagStatus status, unsigned int timeout) {
+ do {
+ auto flagStatus = I2C_GetFlagStatus(I2Cx, flag);
+ if (flagStatus == status) {
+ return true;
+ }
+ } while (timeout-- > 0);
+
+ return false;
+}
+
+static inline bool i2c_wait_for_event(I2C_TypeDef *I2Cx, uint32_t expected, unsigned int timeout) {
+ uint32_t actual;
+ do {
+ actual = I2C_GetLastEvent(I2Cx);
+ if (actual == expected) {
+ return true;
+ }
+ } while (timeout-- > 0);
+
+ dbg_printf("i2c_wait_for_event, expected=%08" PRIx32 ", actual=%08" PRIx32 "\n", expected, actual);
+
+ return false;
+}
+
+const unsigned int timeout = 1000 * 1000;
+
+bool i2c_write(I2C_TypeDef *port, uint8_t address, uint8_t *buf, uint8_t count, bool generate_stop) {
+ if (!i2c_wait_for_flag(port, I2C_FLAG_BUSY, RESET, timeout)) {
+ dbg_printf("Failed while waiting for I2C_FLAG_BUSY\n");
+ return false;
+ }
+
+ I2C_GenerateSTART(port, ENABLE);
+
+ if (!i2c_wait_for_event(port, I2C_EVENT_MASTER_MODE_SELECT, timeout)) {
+ dbg_printf("Failed while waiting for I2C_EVENT_MASTER_MODE_SELECT\n");
+ return false;
+ }
+
+ I2C_Send7bitAddress(port, address, I2C_Direction_Transmitter);
+
+ if (!i2c_wait_for_event(port, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED, timeout)) {
+ dbg_printf("Failed while waiting for I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED\n");
+ return false;
+ }
+
+ do {
+ I2C_SendData(port, *buf++);
+
+ if (!i2c_wait_for_event(port, I2C_EVENT_MASTER_BYTE_TRANSMITTED, timeout)) {
+ dbg_printf("Failed while waiting for I2C_EVENT_MASTER_BYTE_TRANSMITTED\n");
+ return false;
+ }
+ } while (--count);
+
+ if (generate_stop) {
+ I2C_GenerateSTOP(port, ENABLE);
+
+ while (I2C_GetFlagStatus(port, I2C_FLAG_STOPF)) {
+ __NOP();
+ }
+ }
+
+ return true;
+}
+
+bool i2c_read(I2C_TypeDef *port, uint8_t address, uint8_t *buf, uint8_t count, bool generate_start) {
+ start_wait_count = 0;
+ int dbg_counter = 0;
+ (void) dbg_counter;
+
+ if (generate_start) {
+ if (!i2c_wait_for_flag(port, I2C_FLAG_BUSY, RESET, timeout)) {
+ dbg_printf("Failed while waiting for I2C_FLAG_BUSY\n");
+ return false;
+ }
+
+ I2C_AcknowledgeConfig(port, ENABLE);
+// dbg_printf("%2d SR2 SR1 = %08" PRIx32 "\n", dbg_counter, I2C_GetLastEvent(port));
+ I2C_NACKPositionConfig(port, I2C_NACKPosition_Current);
+// dbg_printf("%2d SR2 SR1 = %08" PRIx32 "\n", dbg_counter, I2C_GetLastEvent(port));
+
+ I2C_GenerateSTART(port, ENABLE);
+
+// dbg_printf("%2d SR2 SR1 = %08" PRIx32 "\n", dbg_counter, I2C_GetLastEvent(port));
+
+ /* I2C_EVENT_MASTER_MODE_SELECT = BUSY, MSL and SB flag */
+ if (!i2c_wait_for_event(port, I2C_EVENT_MASTER_MODE_SELECT, timeout)) {
+ dbg_printf("Failed while waiting for I2C_EVENT_MASTER_MODE_SELECT\n");
+ return false;
+ }
+
+ I2C_Send7bitAddress(port, address, I2C_Direction_Receiver);
+
+ // I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED == BUSY, MSL and ADDR
+ if (!i2c_wait_for_event(port, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED, timeout)) {
+ dbg_printf("Failed while waiting for I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED\n");
+ return false;
+ }
+ }
+
+ if (count == 1) {
+ I2C_AcknowledgeConfig(port, DISABLE);
+
+ __disable_irq();
+ (void) port->SR2;
+ I2C_GenerateSTOP(port, ENABLE);
+ __enable_irq();
+
+ while (!I2C_CheckEvent(port, I2C_EVENT_MASTER_BYTE_RECEIVED)) {
+ __NOP();
+ }
+
+ *buf = I2C_ReceiveData(port);
+ } else if (count == 2) {
+ I2C_NACKPositionConfig(port, I2C_NACKPosition_Next);
+
+ __disable_irq();
+ (void) port->SR2;
+ I2C_AcknowledgeConfig(port, DISABLE);
+ __enable_irq();
+
+ while (!I2C_CheckEvent(port, I2C_EVENT_MASTER_BYTE_RECEIVED)) {
+ __NOP();
+ }
+
+ __disable_irq();
+ I2C_GenerateSTOP(port, ENABLE);
+ *buf++ = I2C_ReceiveData(port);
+ __enable_irq();
+ *buf = I2C_ReceiveData(port);
+ } else {
+ do {
+ if (!i2c_wait_for_event(port, I2C_EVENT_MASTER_BYTE_RECEIVED, timeout)) {
+ dbg_printf("Failed while waiting for I2C_EVENT_MASTER_BYTE_RECEIVED, count=%d\n", count);
+ return false;
+ }
+
+ *buf++ = I2C_ReceiveData(port);
+ } while (--count != 2);
+
+ I2C_AcknowledgeConfig(port, DISABLE);
+
+ __disable_irq();
+ *buf++ = I2C_ReceiveData(port);
+ I2C_GenerateSTOP(port, ENABLE);
+ __enable_irq();
+
+ *buf++ = I2C_ReceiveData(port);
+
+ if (!i2c_wait_for_event(port, I2C_EVENT_MASTER_BYTE_RECEIVED, timeout)) {
+ dbg_printf("Failed while waiting for I2C_EVENT_MASTER_BYTE_RECEIVED\n");
+ return false;
+ }
+
+ *buf = I2C_ReceiveData(port);
+ }
+
+ while (I2C_GetFlagStatus(port, I2C_FLAG_STOPF)) {
+ __NOP();
+ }
+
+ return true;
+}
+
+int main() {
+ SystemInit();
+
+ init_printf(nullptr, dbg_putc);
+
+ dbg_printf("i2c1\n");
+
+ RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO
+ | RCC_APB2Periph_USART1
+ | RCC_APB2Periph_GPIOA
+ | RCC_APB2Periph_GPIOB
+ | RCC_APB2Periph_GPIOC,
+ ENABLE);
+
+ /* ***************************************** */
+
+ // Debug on port B
+
+ RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, ENABLE);
+ RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, DISABLE);
+
+ // Make Port B's pin #5 the debug output pin
+ GPIO_InitTypeDef init;
+ GPIO_StructInit(&init);
+ init.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
+ init.GPIO_Mode = GPIO_Mode_Out_PP;
+ init.GPIO_Speed = GPIO_Speed_2MHz;
+ GPIO_Init(GPIOB, &init);
+
+ /* ***************************************** */
+
+ RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2,
+ ENABLE);
+
+ /*
+ * PB10 I2C2_SCL
+ * PB11 I2C2_SDA
+ */
+
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
+
+ GPIO_StructInit(&init);
+ init.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
+ init.GPIO_Mode = GPIO_Mode_AF_OD;
+ GPIO_Init(GPIOB, &init);
+
+ /*
+ i2c2->CR2 |= 36; // APB1 freq is 36 MHz
+ // 36 MHz = 27.78 ns, 400 kHz = 2500ns
+ // 2500 ns / 27.78 ns = 89.99
+ i2c2->CCR |= I2C_CCR_FS | 90;
+ */
+
+ I2C_TypeDef *const i2c_port = I2C2;
+ I2C_DeInit(i2c_port);
+ I2C_InitTypeDef i2c_init;
+ I2C_StructInit(&i2c_init);
+ i2c_init.I2C_ClockSpeed = 100 * 1000;
+ i2c_init.I2C_Ack = I2C_Ack_Enable;
+ i2c_init.I2C_Mode = I2C_Mode_I2C;
+ I2C_Init(i2c_port, &i2c_init);
+ I2C_Cmd(i2c_port, ENABLE);
+
+ const int DS3231_address = 0b11010000; // 0x68
+
+ run = true;
+ bool toggle = true;
+ bool success = true;
+ while (run) {
+ GPIO_WriteBit(GPIOB, GPIO_Pin_5, toggle ? Bit_SET : Bit_RESET);
+ GPIO_WriteBit(GPIOB, GPIO_Pin_6, toggle ? Bit_SET : Bit_RESET);
+ GPIO_WriteBit(GPIOB, GPIO_Pin_7, toggle ? Bit_SET : Bit_RESET);
+ toggle = !toggle;
+
+ if (!success) {
+ dbg_printf("resetting...\n");
+ i2c_hard_reset(i2c_port, i2c_init);
+ }
+
+ uint8_t buf[12];
+ for (size_t i = 0; i < SizeOfArray(buf); i++) {
+ buf[i] = 0;
+ }
+
+ success = i2c_write(i2c_port, DS3231_address, buf, 1, false);
+
+ if (!success) {
+ dbg_printf("i2c_write failed\n");
+ continue;
+ }
+
+ success = i2c_read(i2c_port, DS3231_address, buf, SizeOfArray<uint8_t>(buf), false);
+
+ if (success) {
+ dbg_printf(
+ "%3d %3d %3d %3d %3d %3d %3d %3d %3d %3d %3d %3d\n"
+// "%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x" /*" %02x %02x %02x %02x"*/ "\n"
+ "\n",
+// buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7], buf[8],
+// buf[9], buf[10], buf[11], buf[12], buf[13], buf[14], buf[15],
+ buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7], buf[8],
+ buf[9], buf[10], buf[11]/*, buf[12], buf[13], buf[14], buf[15]*/);
+ }
+ }
+
+ return 0;
+}
+
generated by cgit v1.2.3 (git 2.46.0) at 2024-12-23 05:56:23 +0000