167 lines
4.4 KiB
C
167 lines
4.4 KiB
C
#include "am_mcu_apollo.h"
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#include "am_bsp.h"
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#include "am_util.h"
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// #define ASYNCH // comment out to use blocking methods
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#define DEVICE_ADDR (0xEE)
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#define DEVICE_ADDR_R (DEVICE_ADDR | 0x01)
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#define DEVICE_ADDR_W (DEVICE_ADDR & 0xFE)
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#define IOMN (2)
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#define I2C_FREQ (AM_HAL_IOM_400KHZ)
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void* iom_handle = NULL;
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am_hal_iom_config_t iom_cfg = {0};
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am_hal_iom_transfer_t xfer = {0};
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#define report(s) am_util_stdio_printf("status: 0x%08X (function: %s, file: %s, line: %d)\n", s, __PRETTY_FUNCTION__, __FILE__, __LINE__)
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volatile bool xfer_complete = false;
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volatile uint32_t txn_stat = 0;
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void xfer_complete_callback(void *pCallbackCtxt, uint32_t transactionStatus){
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(void)pCallbackCtxt;
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xfer_complete = true;
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txn_stat = transactionStatus;
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}
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void init_iom( void ){
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uint32_t status = AM_HAL_STATUS_SUCCESS;
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iom_cfg.eInterfaceMode = AM_HAL_IOM_I2C_MODE;
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iom_cfg.ui32ClockFreq = I2C_FREQ;
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iom_cfg.pNBTxnBuf = NULL;
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iom_cfg.ui32NBTxnBufLength = 0;
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#ifdef ASYNCH
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// iom_cfg.pNMTxnBuf = ???
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// iom_cfg.ui32NBTxnBufLength = ???
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#endif // ASYNCH
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status = am_hal_iom_initialize(IOMN, &iom_handle);
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if(status != AM_HAL_STATUS_SUCCESS){ report(status); }
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status = am_hal_iom_power_ctrl(iom_handle, AM_HAL_SYSCTRL_WAKE, false);
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if(status != AM_HAL_STATUS_SUCCESS){ report(status); }
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status = am_hal_iom_configure(iom_handle, &iom_cfg);
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if(status != AM_HAL_STATUS_SUCCESS){ report(status); }
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status = am_hal_iom_enable(iom_handle);
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if(status != AM_HAL_STATUS_SUCCESS){ report(status); }
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// config pins
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status = am_hal_gpio_pinconfig(AM_BSP_GPIO_IOM2_SCL, g_AM_BSP_GPIO_IOM2_SCL);
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if(status != AM_HAL_STATUS_SUCCESS){ report(status); }
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status = am_hal_gpio_pinconfig(AM_BSP_GPIO_IOM2_SDA, g_AM_BSP_GPIO_IOM2_SDA);
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if(status != AM_HAL_STATUS_SUCCESS){ report(status); }
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}
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//*****************************************************************************
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//
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// Main
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//
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//*****************************************************************************
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int
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main(void)
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{
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uint32_t status = AM_HAL_STATUS_SUCCESS;
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//
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// Perform the standard initialzation for clocks, cache settings, and
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// board-level low-power operation.
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//
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am_hal_clkgen_control(AM_HAL_CLKGEN_CONTROL_SYSCLK_MAX, 0);
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am_hal_cachectrl_config(&am_hal_cachectrl_defaults);
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am_hal_cachectrl_enable();
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am_bsp_low_power_init();
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//
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// Initialize the printf interface for UART output
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//
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am_bsp_uart_printf_enable();
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//
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// Print the banner.
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//
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am_util_stdio_terminal_clear();
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am_util_stdio_printf("I2C Testing\n\n");
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// do i2c stuff
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init_iom();
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char cmd[2];
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cmd[0] = 0x01;
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cmd[1] = 0x00;
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// i2c.write(addr8bit, cmd, 2);
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xfer.uPeerInfo.ui32I2CDevAddr = DEVICE_ADDR_W;
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xfer.ui32InstrLen = 0;
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xfer.ui32Instr = 0;
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xfer.ui32NumBytes = 2;
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xfer.eDirection = AM_HAL_IOM_TX;
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xfer.pui32TxBuffer = (uint32_t*)cmd;
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xfer.pui32RxBuffer = NULL;
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xfer.bContinue = false;
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xfer.ui8RepeatCount = 0;
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xfer.ui8Priority = 1;
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xfer.ui32PauseCondition = 0;
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xfer.ui32StatusSetClr = 0;
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#ifndef AM_HAL_DISABLE_API_VALIDATION
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am_util_stdio_printf("API Validation is enabled\n");
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#else
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am_util_stdio_printf("API Validation DISabled\n");
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#endif
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#ifdef ASYNCH
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status = am_hal_iom_nonblocking_transfer(iom_handle, &xfer, xfer_complete_callback, NULL);
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report(status);
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while(!xfer_complete){
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static uint32_t count = 0;
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am_util_stdio_printf("waiting for xfer to complete... %d\n", count++);
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if(count > 0x0000FFFF){
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am_util_stdio_printf("!TIME OUT!\n");
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break;
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}
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}
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#else
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status = am_hal_iom_blocking_transfer(iom_handle, &xfer);
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report(status);
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#endif // ASYNCH
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const char* stat_msg = NULL;
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switch(status){
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case AM_HAL_STATUS_SUCCESS : stat_msg = "success"; break;
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case AM_HAL_IOM_ERR_I2C_NAK : stat_msg = "NAK"; break;
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case AM_HAL_IOM_ERR_I2C_ARB : stat_msg = "ARB"; break;
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default:
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stat_msg = "UNKNOWN ERROR";
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break;
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}
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am_util_stdio_printf("I2C write result: %s\n", stat_msg);
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// cmd[0] = 0x00;
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// i2c.write(addr8bit, cmd, 1);
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// i2c.read(addr8bit, cmd, 2);
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//
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// Loop forever while sleeping.
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//
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while (1)
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{
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//
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// Go to Deep Sleep.
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//
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am_hal_sysctrl_sleep(AM_HAL_SYSCTRL_SLEEP_DEEP);
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}
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}
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